Highly stable lithium nickel cobalt aluminate positive electrode material and its preparation method

A technology of nickel cobalt lithium aluminate and cathode material, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of electrolyte side reactions and impurity gas release, so as to slow down side reactions and prevent battery output characteristics Effects of deterioration, improved thermal stability and cycle life

Active Publication Date: 2014-12-17
HUBEI RONGBAI LITHIUM BATTERY MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a highly stable nickel-cobalt-lithium-aluminate positive electrode material and a preparation method thereof, so as to solve the problems of NCA material releasing impurity gases and side reactions with electrolyte during charging and discharging of the battery; The present invention provides an NCA cathode material with high energy density, high thermal stability and long cycle life, which will have a very broad application market especially in the field of power batteries

Method used

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  • Highly stable lithium nickel cobalt aluminate positive electrode material and its preparation method
  • Highly stable lithium nickel cobalt aluminate positive electrode material and its preparation method
  • Highly stable lithium nickel cobalt aluminate positive electrode material and its preparation method

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Embodiment 1

[0040] (1) Preparation of nickel-cobalt-aluminum hydroxide: Mix nickel sulfate solution, cobalt sulfate solution, and aluminum sulfate solution as raw materials with Ni:Co:Al atomic ratio of 0.80:0.15:0.05, and mix the metal ion concentration in the solution 1.0mol / L. Then add 5 mol / L ammonia solution, 5 mol / L sodium hydroxide solution and the mixed solution together into the reactor containing 1 / 4 deionized water. The reaction control temperature is 50°C, the pH value is 11.0, and the ammonia value is 10g / L. Stir to carry out the precipitation and crystallization reaction. After the reaction is complete, the solid-liquid separation of the overflowing slurry is started. The separated solid product is washed and dried to obtain Spherical nickel cobalt aluminum hydroxide powder.

[0041] (2) The nickel-cobalt-aluminum hydroxide powder obtained above was heat-treated at 400° C. for 10 hours under air condition to obtain nickel-cobalt-aluminum oxide.

[0042] (3) The nickel-coba...

Embodiment 2

[0046] (1) Preparation of nickel-cobalt-aluminum hydroxide: Ni:Co atomic ratio is 0.90:0.10 nickel sulfate solution and cobalt sulfate solution are mixed evenly as raw materials, and the metal ion concentration in the mixed solution is 2.0mol / L. Then add 10 mol / L ammonia solution, 3 mol / L sodium hydroxide solution and the mixed solution together into the reactor filled with 1 / 3 deionized water. The reaction control temperature is 60°C, the pH value is 10.5, and the ammonia value is 20g / L. Stir to carry out the precipitation and crystallization reaction. After the reaction is complete, the solid-liquid separation of the overflowing slurry is started. The separated solid product is washed and dried to obtain Spherical nickel cobalt hydroxide. Slurry the nickel-cobalt hydroxide particles with a solution containing 5% aluminum, and precipitate aluminum as hydroxide on the surface of the nickel-cobalt hydroxide particles through a crystallization reaction to form a nickel-cobalt co...

Embodiment 3

[0052] (1) Preparation of nickel-cobalt-aluminum hydroxide: Mix nickel sulfate solution, cobalt sulfate solution, and aluminum sulfate solution as raw materials according to Ni:Co:Al atomic ratio of 0.85:0.12:0.03, and mix the metal ion concentration in the solution It is 1.5mol / L. Then add 5 mol / L ammonia solution, 5 mol / L sodium hydroxide solution and the mixed solution together into the reaction kettle equipped with 1 / 4 deionized water. The reaction temperature is controlled at 45°C, the pH value is 11.5, and the ammonia value is 5g / L. Stir to carry out the precipitation and crystallization reaction. After the reaction is complete, the solid-liquid separation of the overflowing slurry is started. After the separated solid product is washed and dried, it is obtained Almost spherical nickel cobalt aluminum hydroxide.

[0053] (2) The nickel-cobalt-aluminum hydroxide powder obtained above was heat-treated at 150° C. for 15 hours under air condition to obtain nickel-cobalt-alu...

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Abstract

The invention provides a highly stable lithium nickel cobalt aluminate positive electrode material and its preparation method. The characteristic chemical formula of the lithium nickel cobalt aluminate material is LinNi1-x-yCoxAlyO2.mLiMaOb, wherein n is not less than 0.95 and not more than 1.15, x is more than 0.00 and less than 0.30, y is not less than 0.01 and not more than 0.10, m is more than 0.00 and less than 0.05, a is more than 0.0 and less than 3.0, b is a valence matching coefficient, and b is (M valence * a +1) / 2. The morphology of the material is a spheroidic secondary particle structure formed by a primary particle, the average particle size of the primary particle is 0.10-2.5mum, and the average particle size of the secondary particle is 3.0-20.0mum. LiMaOb is a composite oxide lithium ion conductor coating and is uniformly distributed on the surface of the primary and secondary particle, so the removal and embedding of lithium ions in the battery charge and discharge process are promoted, and the side reactions of the lithium nickel cobalt aluminate material and an electrolyte can be inhibited. The above lithium ion battery positive electrode material has the advantages of high energy, high safety and long cycle life.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material nickel cobalt lithium aluminate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, light weight, no memory effect, high energy conversion efficiency, and no pollution. They have been widely used in mobile communication power supplies, electric tools, electric vehicles and other fields. With the rapid development of smart 3G mobile phones, tablet computers, and electric vehicles, people have higher and higher requirements for lithium-ion batteries. Especially in the field of electric vehicles, lithium batteries are required not only to have high energy density, but also to have excellent cycle life and Safe and stable performance. [0003] Lithium-ion battery cathode materials on the market mainly include lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium iron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCH01M4/366H01M4/485H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 袁徐俊王顺林陈明峰陈涨宗温美盛
Owner HUBEI RONGBAI LITHIUM BATTERY MATERIAL CO LTD
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