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High-nickel positive electrode material, preparation method thereof and lithium ion secondary battery

A positive electrode material, high-nickel technology, applied in the direction of secondary batteries, positive electrodes, battery electrodes, etc., can solve the problem of easy damage to the surface structure of high-nickel positive electrode materials, affect the electrochemical performance of high-nickel positive electrode materials, and affect the long-term cycle stability of positive electrode materials In order to achieve the effect of reducing grain boundary transmission impedance, improving structural stability, and suppressing side reactions

Active Publication Date: 2021-02-19
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After a long cycle of the existing high-nickel cathode materials, the particle cracking makes the internal structure easy to be directly exposed, which affects the long-term cycle stability of the cathode material and affects the rate performance of the lithium battery.
[0003] Moreover, the existing preparation methods of high-nickel cathode materials can, for example, use liquid-phase mixing coating materials, but the liquid-phase method is easy to destroy the surface structure of high-nickel cathode materials, affecting the electrochemical performance of high-nickel cathode materials, and through liquid-phase coating The phosphates covered must be soluble phosphates, but in reality most phosphate metal salts are difficult to dissolve in water, a large amount of sewage will be generated in the washing process, additional processes such as filtration and drying will increase production costs

Method used

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  • High-nickel positive electrode material, preparation method thereof and lithium ion secondary battery
  • High-nickel positive electrode material, preparation method thereof and lithium ion secondary battery
  • High-nickel positive electrode material, preparation method thereof and lithium ion secondary battery

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preparation example Construction

[0077] The present application also provides a method for preparing a high-nickel positive electrode material, the method comprising the following steps S100-S200:

[0078] S100, add Ni x co y m z Oxide or Ni x co y m z The hydroxide, the lithium compound and the phosphate metal salt are mixed to obtain a first mixture, and the first mixture is sintered to obtain a primary sintered product, wherein, x+y+z=1, and M is selected from at least one of Mn or Al kind;

[0079] Wherein, the primary sintered product includes a plurality of primary particles and a first coating layer forming the surface of the primary particles; the first coating layer includes phosphoric acid compound.

[0080] By adding metal phosphate components, the primary particles of high-nickel positive electrode materials can be coated with phosphate compounds and doped with metal cations during the firing process; while the primary particle coating can prevent the secondary particles from cracking, the p...

Embodiment 1

[0115] A preparation method of high-nickel positive electrode material, comprising the following steps:

[0116] (1) The precursor Ni 0.88 co 0.09 al 0.03 (OH) 2 , lithium hydroxide and SrHPO with an average particle size D50 of 0.2 μm 4 Mix evenly in a high mixer, control the mixing temperature to 30°C, and mix for 1h to obtain the first mixture, wherein Li / (Ni+Co+Al)=1.05, and the phosphate content is 0.3wt of the total mass of the first mixture %;

[0117] (2) Sinter the first mixture at 750°C in an atmosphere with an oxygen content ≥ 95% for 10 hours, crush and sieve to obtain the primary sintered Li 1.05 Ni 0.88 co 0.09 al 0.03 Sr 0.0026 o 2 , doped with Sr in the primary sinter. (3) The above primary sintered Li 1.05 Ni 0.88 co 0.09 al 0.03 Sr 0.0026 o 2 With dihydrogen phosphate Al(H 2 PO 4 ) 3 Mix uniformly in a high mixer, control the mixing temperature to 30°C, and mix for 1 hour to obtain a second mixture, wherein the phosphate content is 0.1wt% ...

Embodiment 2

[0123] (1) The precursor Ni 0.83 co 0.11 mn 0.06 (OH) 2 , lithium hydroxide and Zr(HPO 4 ) 2 Mix evenly in a high mixer, control the mixing temperature to 25°C, and mix for 2 hours to obtain the first mixture, wherein Li / (Ni+Co+Al)=1.03, and the phosphate content is 0.2wt of the total mass of the first mixture %;

[0124] (2) The first mixture was sintered at 800°C in an atmosphere with an oxygen content ≥ 95% for 20 hours, crushed and sieved to obtain the primary sintered Li 1.03 Ni 0.83 co 0.11 mn 0.06 Zr 0.0009 o 2 , The primary sinter is doped with Zr.

[0125] (3) The above primary sintered Li 1.03 Ni 0.83 co 0.11 mn 0.06 Zr 0.0009 o 2 with dihydrogen phosphate NH 4 h 2 PO 4 Mix evenly in a high mixer, control the mixing temperature to 25°C, and mix for 2 hours to obtain a second mixture, wherein the phosphate content is 0.3wt% of the total mass of the second mixture;

[0126] (4) The second mixture was sintered at 600° C. in an atmosphere with an oxy...

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Abstract

The invention relates to the field of positive electrode materials, and provides a high-nickel positive electrode material, a preparation method thereof, and a lithium ion secondary battery. The high-nickel positive electrode material comprises secondary particles, wherein the secondary particles comprise a plurality of primary particles, the primary particles comprise an active substance, the general chemical formula of the active substance is LibNixCoyMzNwO2, 0.95 <=b <=1.05, 0.8 <=x < 1, 0<y+z<=0.2, x+y+z=1, 0.0001<=w<=0.003, M is selected from at least one of Mn and Al, and N is a metal; acoating layer which comprises a first coating layer and a second coating layer, wherein the first coating layer is formed on the surface of the primary particle, the second coating layer is formed onthe surface of the secondary particle, and each of the first coating layer and the second coating layer contains a phosphoric acid compound. According to the high-nickel positive electrode material,the preparation method thereof and the lithium ion secondary battery, the cost is low, large-scale production can be realized, and the rate capability and the cycling stability of the lithium batterycan be effectively improved.

Description

technical field [0001] The application relates to the technical field of cathode materials, in particular, to a high-nickel cathode material, a preparation method thereof, and a lithium-ion secondary battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. How to improve the rate performance, thermal stability and cycle stability of lithium batteries has always been the research direction of researchers. After a long cycle of existing high-nickel cathode materials, the particle cracking makes the internal structure easy to be directly exposed, which affects the long-term cycle stability of the cathode material and affects the rate performance of the lithium battery. [0003] Moreover, the existing preparation methods of high-nickel cathode materials can, for example, use liquid-phase mixing...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M4/131H01M10/0525Y02E60/10H01M4/623H01M4/625H01M4/661H01M10/0568H01M10/0569H01M10/425H01M4/36H01M10/052H01M4/364H01M4/1391H01M2004/021H01M2004/028H01M4/0471H01M4/5825C01G53/42C01G53/50C01P2002/52C01P2004/03C01P2004/32C01P2004/50C01P2004/61C01P2004/62C01P2004/80C01P2006/12C01P2006/40
Inventor 宋雄张弘旭罗亮杨顺毅杨才德黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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