A kind of nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

A cathode material, nickel-cobalt-manganese technology, applied in the field of lithium-ion battery nickel-cobalt-manganese ternary cathode material and its preparation, which can solve the problem of easy structural peeling and collapse between grain boundaries, reduction of battery energy density, and reduction of high-temperature storage performance, etc. problems, to achieve the effect of improving structural stability and high temperature cycle performance, improving compactness and high tap density

Active Publication Date: 2021-10-15
HUNAN CHANGYUAN LICO CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these solutions have the following problems: ①The tap density of small particle products is low, which causes the energy density of the battery to decrease; Although the porous structure can reduce the internal resistance of the battery to a certain extent, the reduction space is limited; ④The secondary particle density of the product is poor, and the structure between the grain boundaries is prone to peeling and collapse under degraded charging and discharging conditions. Significant attenuation

Method used

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  • A kind of nickel-cobalt-manganese ternary positive electrode material and preparation method thereof
  • A kind of nickel-cobalt-manganese ternary positive electrode material and preparation method thereof
  • A kind of nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

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Embodiment 1

[0029] A kind of nickel-cobalt-manganese ternary cathode material of the present invention, its molecular formula is Li(Ni 0.6 co 0.2 mn 0.2 ) 0.98 W 0.02 o 2 , the material is a twinned or triplet hollow structure with a particle size D50 of 3.75 μm.

[0030] A preparation method of the nickel-cobalt-manganese ternary positive electrode material of the present embodiment, comprising the steps of:

[0031] (1) The hollow precursor Ni with a particle diameter of 1.5-3.0 μm 0.6 co 0.2 mn 0.2 (OH) 2 Add it into the aqueous solution containing ammonia water and NaOH and mix it. The concentration of ammonia water is controlled to be 3-4g / L, the pH is controlled to be 11.3-11.6, the stirring speed is 500rpm, and it is reacted at a constant temperature of 60-63°C for 10h, filtered, washed, After drying, a twin or triple ecological hollow precursor with a particle size D50 of 3.5 μm is obtained;

[0032] (2) LiOH·H 2 O and the resulting precursor and WO 3 Mix according to ...

Embodiment 2

[0035] A kind of nickel-cobalt-manganese ternary cathode material of the present invention, its molecular formula is Li(Ni 0.6 co 0.2 mn 0.2 ) 0.99 B 0.01 o 2 , the material is twin or triple hollow structure, particle size D50 is 3.88μm.

[0036] A preparation method of the nickel-cobalt-manganese ternary positive electrode material of the present embodiment, comprising the steps of:

[0037] (1) The hollow precursor Ni with a particle diameter of 1.5-3.0 μm 0.6 co 0.2 mn 0.2 (OH) 2 Add it into the aqueous solution containing ammonia water and NaOH and mix it. The concentration of ammonia water is controlled to be 3-4g / L, the pH is controlled to be 11.3-11.6, the stirring speed is 500rpm, and it is reacted at a constant temperature of 60-63°C for 10h, filtered, washed, After drying, a twin or triple ecological hollow precursor with a particle size D50 of 3.5 μm is obtained;

[0038] (2) LiOH·H 2 O with the resulting precursor and H 3 BO 3 Mix according to the molar...

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Abstract

The invention discloses a nickel-cobalt-manganese ternary positive electrode material. The particles of the material have twinned or triple hollow structures, which are formed by fusing aggregates composed of 2 to 3 secondary particles with hollow structures. The aggregates The shell interfaces where adjacent secondary particles are in contact are fused into one. The material is obtained by performing a secondary reaction on the precursor of secondary particles with a hollow structure, so that 2 to 3 secondary particles form a precursor in the form of an aggregate, mixed with a Li source, and sintered under negative pressure. Compared with the existing high-power nickel-cobalt-manganese ternary material, the nickel-cobalt-manganese ternary positive electrode material of the present invention has higher tap density, lower residual alkali content, and lower battery internal resistance. High temperature cycle performance is better.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a lithium-ion battery nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles, the requirements for high-power ternary materials for various power vehicles such as PHEV and HEV are getting higher and higher. While pursuing high capacity, higher requirements are put forward for high rate and low internal resistance. At present, the main method is to make the positive electrode material into small particles with a particle size of 3-10 μm in a porous or hollow structure, so as to reduce the internal resistance of the battery and improve the rate performance. For example, CN112047397A relates to a secondary granular material with a hollow structure and an internal porous particle size D50 of 4-10 μm; CN111276680A relates to a core-shell struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCC01G53/50C01P2004/03C01P2004/61C01P2006/11C01P2006/12C01P2006/40C01P2006/80H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 熊学李厦李旻周友元赵俊豪黄滔黄承焕
Owner HUNAN CHANGYUAN LICO CO LTD
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