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Preparation method of multi-layer coated ternary positive electrode material

A positive electrode material and multi-layer coating technology, which is applied in the field of preparation of multi-layer coated ternary positive electrode materials, can solve the problems of unfavorable electrode performance, non-uniform coating, reducing ionic conductivity of positive electrode materials, etc., so as to improve uniformity and consistency, improve cycle performance, improve the effect of bonding strength

Active Publication Date: 2021-09-07
WANXIANG 123 CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the non-uniform coating when the positive electrode material is coated with inorganic substances in the prior art; when the conductive polymer is used for coating, although the uniformity of the coating can be improved, the introduction of the conductive polymer will cause To reduce the ionic conductivity of the positive electrode material, which is not conducive to the improvement of electrode performance, a method for preparing a multilayer coated ternary positive electrode material is provided, using Li 2+x C 1-x B x o 3 The ternary positive electrode material is coated with a conductive polymer in multiple layers, which ensures the uniformity of the coating and makes the coating layer have good ion conductivity, which can effectively improve the performance of the battery.

Method used

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  • Preparation method of multi-layer coated ternary positive electrode material

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Embodiment 1

[0028]A method for preparing a multilayer coated ternary positive electrode material, comprising the steps of:

[0029] (1) Mix the NCM ternary material precursor NCM811 (Ni:Co:Mn molar ratio is 8:1:1) with lithium carbonate and zirconia, and stir evenly to obtain a powder material. The molar ratio of NCM811 to lithium carbonate is 1: 1.1, the doping amount of zirconia is 1000ppm of the mass of NCM811; the powder material is calcined once, the calcining temperature is 800°C, the calcining time is 24h, and the NCM ternary material is obtained after crushing;

[0030] (2) Mix lithium borate and lithium carbonate according to the molar ratio of B atoms and C atoms at 1:1, and sinter at 850°C for 24 hours to obtain Li 2.5 C 0.5 B 0.5 o 3 coating agent;

[0031] (3) Combining NCM ternary materials with Li 2.5 C 0.5 B 0.5 o 3 After the coating agent is mixed evenly, the secondary calcination is carried out, and the Li 2.5 C 0.5 B 0.5 o 3 The mass of the coating agent is ...

Embodiment 2

[0034] A method for preparing a multilayer coated ternary positive electrode material, comprising the steps of:

[0035] (1) Mix the NCM ternary material precursor NCM811 with lithium hydroxide and alumina, and stir evenly to obtain a powder material. The molar ratio of NCM811 to lithium hydroxide is 1:1.0, and the doping amount of alumina is 300ppm of the mass of NCM811 ;The powder material is calcined once, the calcining temperature is 700°C, the calcining time is 26h, and the NCM ternary material is obtained after crushing;

[0036] (2) Mix lithium borate and lithium carbonate uniformly at a molar ratio of B atoms to C atoms of 1:4, and sinter at 800°C for 26 hours to obtain Li 2.2 C 0.8 B 0.2 o 3 coating agent;

[0037] (3) Combining NCM ternary materials with Li 2.2 C 0.8 B 0.2 o 3 After the coating agent is mixed evenly, the secondary calcination is carried out, and the Li 2.2 C 0.8 B 0.2 o 3 The mass of the coating agent is 500ppm of the mass of the NCM tern...

Embodiment 3

[0040] A method for preparing a multilayer coated ternary positive electrode material, comprising the steps of:

[0041] (1) Mix the NCM ternary cathode material precursor NCM811 with lithium carbonate and alumina, and stir evenly to obtain a powder material. The molar ratio of NCM811 to lithium carbonate is 1:1.2, and the doping amount of zirconia is 2000ppm of the mass of NCM811; The powder material is calcined once, the calcining temperature is 900°C, the calcining time is 18h, and the NCM ternary material is obtained after crushing;

[0042] (2) Lithium borate and lithium carbonate are mixed evenly at a molar ratio of B atoms to C atoms of 2:3, and sintered at 900°C for 18 hours to obtain Li 2.4 C 0.6 B 0.4 o 3 coating agent;

[0043] (3) Combining NCM ternary materials with Li 2.4 C 0.6 B 0.4 o 3 After the coating agent is mixed evenly, the secondary calcination is carried out, and the Li 2.4 C 0.6 B 0.4 o 3 The mass of the coating agent is 2000ppm of the mass...

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Abstract

The invention discloses a preparation method of a multi-layer coated ternary positive electrode material, which comprises the steps of (1) mixing an NCM ternary material precursor with a lithium source and a dopant, and carrying out primary calcination to obtain an NCM ternary material; (2) uniformly mixing and sintering lithium borate and lithium carbonate to obtain a Li<2+x>C<1-x>BxO3 coating agent, wherein x is greater than 0 and less than 1; (3) uniformly mixing the NCM ternary material and the Li<2+x>C<1-x>BxO3 coating agent, then carrying out secondary calcination, and coating the surface of the NCM ternary material with a Li<2+x>C<1-x>BxO3 layer; and (4) coating the Li<2+x>C<1-x>BxO3 layer with a polyaniline layer. According to the invention, Li<2+x>C<1-x>BxO3 and the conductive polymer are adopted to perform multi-layer coating on the ternary positive electrode material, so that the coating layer has good ionic conductivity while the coating uniformity is ensured, and the battery performance can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a multilayer coated ternary positive electrode material. Background technique [0002] With the development of new energy vehicles, lithium-ion power batteries have attracted much attention as the most popular electric vehicle power batteries. Compared with the mature and stable graphite anode, the research and development of cathode materials with high capacity, long life, low cost, safety and environmental protection is particularly urgent. The currently commonly used cathode materials for lithium batteries mainly include layered lithium cobaltate, ternary materials, spinel-structured lithium manganate and olivine-structured lithium iron phosphate. Ternary materials have high specific capacity, energy density and power density, and relatively stable performance, so they have become popular materials for commercial cathodes. However, the e...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/624H01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 汉海霞陈瑶许梦清
Owner WANXIANG 123 CO LTD
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