Nickel Oxide NiO Bookmark Quick Facts Composition Nickel II oxide Formula NiO Appearance Green crystalline solid Common Forms Powder tablets pellets Key Properties Semiconductor p type Wide bandgap High thermal stability Antiferromagnetic below 523 K Chemically stable in air Electrical Behavior Intrinsic p type semiconductor due to nickel vacancies Conductivity increases with temperature Used in transparent conducting films synthesis Applications Major component in nickel iron NiFe batteries cathode Active material in supercapacitors pseudocapacitance Gas sensing ethanol CO H2 Catalysis Electrochromic devices smart windows Varistors ceramic surge protectors Pigments ceramics glass Safety Handling Fine powder avoid inhalation skin contact Use PPE gloves mask goggles Not acutely toxic but potential carcinogen handle with care Synthesis Methods Thermal decomposition of nickel hydroxide carbonate nitrate Precipitation from nickel salts calcination Nickel plating anodization Nickel oxidation in air Physical Data Density 681 g cm Melting Point 1955 C Structure Cubic rock salt crystal lattice Color Opaque green

(nickel oxide nio)

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Nickel monoxide NiO is a significant inorganic compound. It appears as a green to black crystalline solid. Its chemical formula is NiO. This oxide is a key starting material for many nickel compounds and materials. NiO possesses several notable properties. It is an antiferromagnetic material below its Neel temperature of approximately 523 K. It exhibits p-type semiconducting behavior with a relatively wide band gap around 3.6-4.0 eV. Its electrical resistivity decreases with increasing temperature. NiO is generally stable in air but can dissolve in acids forming nickel salts. It is insoluble in water and alkalis. NiO is non-stoichiometric meaning its composition can deviate slightly from Ni1O1 often being nickel-deficient. Industrially NiO is produced primarily by heating nickel metal powder above 400°C in air or by thermal decomposition of nickel carbonate or nickel hydroxide at high temperatures. Precipitation from nickel salt solutions using alkalis is another common method followed by calcination. Nickel monoxide finds widespread applications. It serves as a crucial precursor in manufacturing nickel steel alloys and other nickel-based alloys. It is a vital component in the production of nickel salts for electroplating baths. NiO is a major active material in the positive electrodes cathodes of nickel-based rechargeable batteries like NiCd and NiMH. It acts as a catalyst in various chemical processes including hydrogenation reactions and the oxidation of organic compounds. In the ceramics industry NiO is used as a pigment providing green black or gray colors to glasses and ceramic glazes frits and enamels. It is also employed in the production of ferrites. Handling NiO requires caution. It is considered a carcinogen by inhalation exposure routes. Nickel monoxide dust can cause respiratory irritation. Chronic inhalation exposure is linked to increased risk of lung and nasal cancers. It can also cause skin sensitization dermatitis and allergic reactions nickel itch in susceptible individuals. Proper engineering controls ventilation and personal protective equipment PPE like respirators and gloves are essential when working with NiO powder. Avoid generating dust. Store in a tightly closed container in a cool dry well-ventilated place away from incompatible materials.

(nickel monoxide)

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Nickel Dioxide Bookmark

(nickel dioxide)

Nickel dioxide, chemical formula NiO₂, is an inorganic compound and an oxide of nickel. It presents as a black or dark gray solid material. This compound is notable for its inherent instability under standard ambient conditions. Pure nickel dioxide is difficult to synthesize and store reliably because it readily decomposes. It often loses oxygen, reverting to nickel(II) oxide (NiO) or forming hydrated species like nickel oxide-hydroxide (NiOOH).

This instability poses significant challenges for handling and direct application. However, nickel dioxide holds substantial importance in electrochemistry, particularly in the context of rechargeable batteries. While pure NiO₂ isn’t typically the active material itself, it is intimately related to the nickel oxyhydroxide (NiOOH) phase.

Within nickel-based battery chemistries, such as nickel-cadmium (NiCd) and nickel-metal hydride (NiMH), the positive electrode relies on a reversible transformation. During charging, nickel hydroxide (Ni(OH)₂) oxidizes to nickel oxyhydroxide (NiOOH). Nickel dioxide (NiO₂) represents a higher, but less stable, oxidation state beyond NiOOH. Achieving or approaching this Ni(IV) state is crucial for the high energy density potential in these battery systems. The cycling between these nickel oxidation states enables the storage and release of electrical energy.

(nickel dioxide)

The quest to stabilize nickel dioxide or harness its high oxidation state effectively is a key driver in battery research, especially for developing advanced nickel-rich cathodes in next-generation lithium-ion batteries. Understanding its properties and behavior remains fundamental to improving the capacity, longevity, and safety of energy storage technologies relying on nickel chemistry. Its reactivity, while a challenge, underpins its electrochemical value.
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Black Nickel Oxide Definition Black Nickel Oxide refers to a specific form of nickel oxide characterized by its black color. Its chemical formula is NiO, identical to the more common green nickel oxide, but its distinct color arises from deviations in stoichiometry and crystal structure. It is a nickel(II) compound.

(black nickel oxide)

Production Synthesis typically involves the controlled calcination (heating in air) of nickel salts like nickel hydroxide Ni(OH)₂ or nickel carbonate NiCO₃ at elevated temperatures, usually between 600°C and 1000°C. Precise temperature control and atmosphere are crucial to achieve the desired black form and particle properties.

Key Properties Its defining feature is its black color, contrasting with the green of stoichiometric NiO. It possesses high surface area and significant electrical conductivity compared to the insulating green form. This conductivity stems from nickel cation vacancies within the crystal lattice. It exhibits good chemical stability and catalytic activity.

Primary Applications Its unique properties drive several important uses. It serves as a precursor material for manufacturing nickel salts and specialty nickel powders. It is a vital component in the production of nickel-iron (Edison) batteries and nickel-cadmium batteries, acting as the active cathode material. It finds use as a black pigment in ceramics, glass, and enamel frits, providing deep, stable coloration. Its catalytic properties make it useful in certain chemical reactions, including hydrocarbon reforming and oxidation processes. It is also employed in the production of ferrites.

(black nickel oxide)

Safety Considerations Handle Black Nickel Oxide with care. Nickel compounds are known skin sensitizers and respiratory irritants. Inhalation of dust poses health risks, including potential carcinogenicity associated with certain nickel compounds. Use appropriate personal protective equipment like gloves, safety glasses, and respirators in dusty conditions. Ensure good ventilation during handling and processing.
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Nickel cobalt oxide NiCo2O4 represents a significant mixed transition metal oxide with a spinel crystal structure. This material has gained considerable attention due to its unique combination of properties valuable for electrochemical applications. Key characteristics include excellent electrical conductivity significantly higher than single-component oxides like NiO or Co3O4 arising from the mixed valence states of nickel and cobalt ions enabling easier electron hopping. It also exhibits rich redox chemistry providing multiple oxidation states for charge storage. Furthermore NiCo2O4 demonstrates good electrochemical stability and catalytic activity particularly for the oxygen evolution reaction OER.

(nickel cobalt oxide)

These properties make NiCo2O4 a highly promising material for several key energy technologies. In lithium-ion batteries it serves as an effective anode material offering high theoretical capacity and good rate capability due to its conductivity. For supercapacitors NiCo2O4 is a premier pseudocapacitive material enabling high specific capacitance and energy density through fast reversible surface redox reactions often utilized in nanostructured forms like nanowires or nanosheets to maximize surface area. Its strong catalytic activity for the OER is crucial for electrochemical water splitting devices making it a candidate for efficient hydrogen production catalysts. It also finds use in sensors and electrocatalysis.

(nickel cobalt oxide)

Advantages over alternatives include its superior conductivity compared to monometallic oxides enhanced electrochemical activity stemming from synergistic effects between nickel and cobalt and generally good chemical stability. Relatively low cost and natural abundance of its constituent metals add to its appeal. Research continues to optimize NiCo2O4 performance through nanostructuring creating composites with carbon materials or other metals and precisely controlling morphology and stoichiometry to further boost conductivity surface area and active sites for targeted applications in energy storage and conversion systems.
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Nio Nickel refers to the advanced nickel-rich cathode materials used in NIO’s proprietary battery packs for its electric vehicles. This technology is central to NIO’s strategy for achieving longer driving ranges and faster charging times. Nickel-based cathodes offer a higher energy density compared to alternatives, meaning more energy can be stored in the same physical battery size. This directly translates into the impressive ranges NIO vehicles are known for, like the ET7 and ET5 exceeding 600km on a single charge. Furthermore, nickel-rich chemistries generally support faster charging capabilities, allowing NIO owners to replenish significant range quickly at Power Swap stations or ultra-fast chargers. NIO emphasizes responsible sourcing and supply chain management for its nickel. The company actively seeks partnerships and initiatives to ensure the nickel used in its batteries is mined and processed with high environmental and ethical standards, aiming to minimize ecological impact and promote fair labor practices. This focus aligns with the broader sustainability goals of the EV industry. Continuous development of Nio Nickel technology is a priority. NIO invests heavily in battery research, exploring higher nickel content formulations, improved thermal stability, and enhanced cell design. The goal is to push energy density even higher, reduce costs, and further extend vehicle range and performance. The evolution of Nio Nickel is critical for NIO’s competitiveness in the premium EV market. It underpins the core value proposition of long range and rapid replenishment offered by its vehicles and extensive battery swap network. Advancements here will directly influence future model capabilities and NIO’s position in the global transition to sustainable transportation.

(nio nickel)

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Nickel IV Oxide Bookmark Notes

(nickel iv oxide)

Formula NiO2 Black brown solid Unstable compound Rare natural occurrence Typically synthesized not mined
Preparation Methods Electrochemical oxidation of Ni II salts Thermal decomposition nickel compounds under oxygen High pressure oxygen treatment of NiO
Key Properties Strong oxidizing agent Decomposes readily releasing oxygen Decomposes to Ni2O3 then NiO at moderate heat Insoluble in water Dissolves in acids
Primary Applications Important cathode material rechargeable batteries Especially nickel cadmium NiCd and nickel metal hydride NiMH types Functions as the charged positive electrode NiOOH NiO2 couple Electrocatalyst for oxygen evolution reaction OER in water splitting
Handling Precautions TOXIC Handle with care Avoid inhalation skin contact dust Use appropriate PPE gloves fume hood Reacts with reducing agents May cause fire risk Strong oxidizer store away flammables

(nickel iv oxide)

Stability Note Highly reactive Difficult to store long term Decomposes over time even at room temperature Sensitive to moisture heat
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Lithium Nickel Oxide Bookmark Notes:

(lithium nickel oxide)

Core Chemistry: Lithium Nickel Oxide (LiNiO₂) is a layered cathode material for lithium-ion batteries. Nickel ions (+3) occupy the transition metal layer, while lithium ions shuttle in and out of the lithium layer during charging and discharging.

Key Advantage – High Capacity: Its primary appeal is its high theoretical specific capacity (approximately 275 mAh/g). This is significantly higher than older materials like Lithium Cobalt Oxide (LCO), promising batteries with greater energy storage per weight.

Significant Challenges: Despite the high capacity promise, pure LiNiO₂ faces major hurdles:
* **Structural Instability:** During lithium removal (charging), nickel ions (+3) tend to migrate into the lithium layer. This disrupts the crystal structure and hinders lithium re-insertion (discharging).
* **Safety Concerns:** The structural instability, especially at high states of charge and elevated temperatures, increases the risk of thermal runaway reactions (fire/explosion).
* **Synthesis Difficulty:** Achieving the exact, ordered stoichiometric LiNiO₂ structure is notoriously difficult. Non-stoichiometric forms (Li₁₋ₓNi₁₊ₓO₂) with excess nickel in the lithium layer are common, degrading performance.
* **Cobalt Requirement:** Pure LiNiO₂ is impractical. Small amounts of cobalt (or other elements like aluminum, manganese) are essential dopants to stabilize the structure and improve cyclability, though it’s still fundamentally nickel-rich.

Legacy and Evolution: While pure LiNiO₂ proved too unstable for widespread commercial use, it was crucial research material. Its high capacity potential directly led to the development of vastly superior nickel-rich NMC (LiNiMnCoO₂) and NCA (LiNiCoAlO₂) cathodes. These blend nickel for high capacity with other metals (manganese, aluminum) or cobalt for enhanced structural stability, safety, and cycle life.

(lithium nickel oxide)

Current Status: Pure, undoped LiNiO₂ is not used commercially in lithium-ion batteries due to its inherent instability and safety risks. Its importance lies in its historical role and as the foundation for the high-capacity nickel-rich cathodes powering modern electric vehicles and devices. Research continues on stabilizing nickel-rich structures, but always involves dopants or coatings.
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Nickel(II) Oxide: Quick Reference

(nickel 2 oxide)

Formula: NiO. Common Names: Nickel monoxide, Nickelous oxide. CAS Number: 1313-99-1. Appearance: Green to black crystalline solid. Odor: Odorless. Density: ~6.67 g/cm³. Melting Point: High, approximately 1955°C. Solubility: Insoluble in water; soluble in acids and ammonium hydroxide. Key Properties: Basic oxide. Exhibits semiconductor properties (p-type). Antiferromagnetic below ~523 K (Néel temperature). Thermally stable but decomposes to nickel and oxygen above very high temperatures. Readily reacts with acids forming nickel(II) salts. Can be reduced by hydrogen or carbon monoxide to metallic nickel.

Production: Primarily via thermal decomposition of nickel(II) compounds like carbonate (NiCO3 → NiO + CO2) or hydroxide (Ni(OH)2 → NiO + H2O). Also produced by roasting nickel sulfide ores or nickel matte in air. Calcination in controlled atmospheres controls particle size and properties.

Applications: Major component in nickel-iron batteries (Edison cell) as the active cathode material. Important catalyst in various chemical processes, including hydrogenation reactions and methane reforming. Used in the production of nickel salts and nickel catalysts. Finds use in ceramics and glass manufacturing to impart green/black colors. Semiconductor research applications. Used in some ferrite materials.

(nickel 2 oxide)

Safety & Handling: Handle as a carcinogen (suspected human carcinogen, IARC Group 2B). Inhalation hazard; can cause respiratory irritation and potential long-term lung damage. Skin contact may cause irritation. Avoid dust formation. Use appropriate PPE (gloves, respirator, eye protection). Store in a cool, dry place. Dispose of according to local hazardous waste regulations. NFPA Health: 2, Flammability: 0, Instability: 0.
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Nickel(III) Oxide Bookmark: Key Facts

(nickel iii oxide)

Chemical Formula: Ni2O3. This defines nickel(III) oxide, distinguishing it from other nickel oxides like NiO (nickel(II) oxide).

Appearance: Typically presents as a dark gray to black solid powder. Its color is a key visual identifier.

Stability: Nickel(III) oxide is relatively unstable under ambient conditions. It readily decomposes, especially upon heating, losing oxygen to form the more stable nickel(II) oxide (NiO). This decomposition limits its handling and storage.

Synthesis: Often produced by carefully heating nickel(II) nitrate hexahydrate (Ni(NO3)2·6H2O) to moderate temperatures (around 250-400°C). Precise temperature control is crucial to obtain Ni2O3 before further decomposition occurs.

Primary Applications: Its main historical and practical significance lies in electrochemistry.
* **Batteries:** It served as a key active material in the positive electrodes of older nickel-iron (Edison) and nickel-cadmium (NiCd) rechargeable batteries. Here, it undergoes reversible reduction to nickel(II) oxide during discharge. While newer chemistries exist, understanding Ni2O3 remains relevant for these systems.
* **Electrodes:** Used in the preparation of certain nickel-based electrodes for industrial electrochemical processes.

Chemical Behavior: Acts as a strong oxidizing agent due to the Ni3+ ion’s tendency to gain electrons and reduce to Ni2+. This reactivity underpins its role in batteries but also necessitates careful handling.

Safety: Handle with significant caution. Nickel(III) oxide is considered hazardous. It is harmful if swallowed or inhaled (lung irritant). Skin and eye contact should be avoided. It may also cause skin sensitization (allergic reactions). Appropriate personal protective equipment (gloves, goggles, respirator) and safe laboratory practices are essential. Refer to the specific Safety Data Sheet (SDS) for detailed handling and disposal procedures.

(nickel iii oxide)

Key Takeaway: Primarily known for its role as an oxidizing cathode material in nickel-based batteries, nickel(III) oxide is a chemically unstable, reactive compound requiring careful synthesis and strict safety protocols during use.
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