Lithium ion battery positive electrode material, positive electrode plate and lithium ion battery

A lithium-ion battery and cathode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery performance deterioration and electrode expansion, and achieve the effects of improving cycle performance, reducing expansion, and improving power performance.

Pending Publication Date: 2021-11-19
SHENZHEN BYD LITHIUM BATTERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect problem of rapid migration of lithium ions in the charging and discharging process of the pole piece prepared by the single crystal material existing in the prior art; the defect problem of pole piece expansion; and after fast charging or cycling, the battery Defect problem of performance deterioration, providing a lithium-ion battery positive electrode material, positive electrode sheet and lithium-ion battery

Method used

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  • Lithium ion battery positive electrode material, positive electrode plate and lithium ion battery
  • Lithium ion battery positive electrode material, positive electrode plate and lithium ion battery
  • Lithium ion battery positive electrode material, positive electrode plate and lithium ion battery

Examples

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preparation example Construction

[0034] According to the present invention, the preparation method of the positive pole piece comprises:

[0035] (1) Dissolving the coating raw material in a mixed solution of ethanol and deionized water to form solution A; wherein, the weight ratio of the coating raw material, ethanol and deionized water is (5-30): (200-300): 100;

[0036] (2) Add a certain amount of polyvinyl alcohol viscous agent in the solution A to increase the liquid phase viscosity; wherein, the viscosity is 50-200mpa·s;

[0037] (3) Add the single-particle ternary material into solution A and stir evenly to form solution B; wherein, the weight ratio of the single-particle ternary material to the amount of the solution A is (1-10):100; and according to the The molar ratio (0.5-3) of metal elements in the cladding raw material to the ternary material: 100 is added to accurately weighed cladding raw materials; preferably, the cladding raw materials are aluminum nitrate, zirconium acetate and tetratitanat...

Embodiment 1

[0053] This example is to illustrate the preparation of the positive electrode material of the present invention.

[0054] (1) Aluminum nitrate is dissolved in the mixed solution of ethanol and deionized water to form solution A; wherein, the ratio of ethanol and deionized water is a volume ratio of 3:1;

[0055] (2) Add polyvinyl alcohol viscous agent to the solution A; add polyvinyl alcohol according to the mass ratio of 1.0%, wherein the viscosity of polyvinyl alcohol is 150mpa·s;

[0056] (3) The single particle ternary material LiNi 0.8 co 0.11 mn 0.09 o 2 Add in the solution A and stir evenly to form a solution B; add accurately weighed aluminum nitrate according to the molar ratio of the Al element to the ternary material of 0.5:100;

[0057] (4) volatilize the solution B while stirring at a high speed until it becomes a wet jelly C;

[0058] (5) Transfer the jelly C into a freeze dryer for freeze drying; the freezing temperature is set at -40°C for 48 hours;

[0...

Embodiment 2

[0062] This example is to illustrate the preparation of the positive electrode material of the present invention.

[0063] The positive electrode material was prepared in the same manner as in Example 1, except that in step (3), the "molar ratio of Al element to ternary material 0.5:100" was replaced by "molar ratio of Al element to ternary material 2:100"; and "LiNi 0.8 co 0.11 mn 0.09 o 2 " is replaced by "LiNi 0.50 co 0.19 mn 0.31 o 2 ".

[0064] Results The number of the third inner core of the prepared positive electrode material was 1, the thickness of the second cladding layer was 0 nm, and other performance parameters are shown in Table 1.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery positive electrode material, a positive electrode plate and a lithium ion battery. The positive electrode material comprises a first inner core and a first coating layer coating the first inner core, the first inner core comprises n second inner cores, and each second inner core comprises at least one third inner core and a second coating layer selectively coating the third inner core; wherein n is greater than or equivalent to 2 and less than or equivalent to 10. The lithium ion battery adopting the positive electrode material has higher power performance and longer cycle life, and the expansion of the positive electrode material can be effectively inhibited.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery positive electrode material, a positive electrode sheet and a lithium ion battery. Background technique [0002] The electrification of various types of vehicles is an inevitable trend in the development of today's society. However, in the process of popularization of electric vehicles, long charging time and short service life are still two important factors that inhibit the development of electric vehicles. [0003] Single crystal ternary cathode materials are favored due to their excellent cycle life. However, during the rolling process of the pole piece prepared by single crystal material, the single crystal particles on the pole piece will be reoriented, and more 003 surfaces will be exposed. That is to say, lithium desorption / intercalation is parallel to the current collector surface, which is not conducive to the rapid migration of lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 阮泽文邓暄炜陈娜郝嵘潘仪
Owner SHENZHEN BYD LITHIUM BATTERY
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