Lithium ion battery high-nickel ternary positive electrode material and preparation method thereof, and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as damage and uneven distribution of lithium precipitation, achieve simple operation, easy popularization and application, and inhibit the formation of lithium carbonate Effect

Active Publication Date: 2018-06-26
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to: overcome the problems of chemical delithiation, crystal structure destruction, and uneven distribution of lithium precipitation on the surface of the material after removing the residual lithium on the surface of the existing lithium-ion battery high-nickel positive electrode material, and provide a method that can significantly reduce The amount of residual lithium on the surface of the material can also inhibit the generation of lithium carbonate, and the lithium-ion battery high-nickel ternary positive electrode material and its preparation method will not destroy the crystal structure of the material, and the lithium-ion battery

Method used

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  • Lithium ion battery high-nickel ternary positive electrode material and preparation method thereof, and lithium ion battery
  • Lithium ion battery high-nickel ternary positive electrode material and preparation method thereof, and lithium ion battery
  • Lithium ion battery high-nickel ternary positive electrode material and preparation method thereof, and lithium ion battery

Examples

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Embodiment 1

[0036] Select high nickel cathode material LiNi 0.65 co 0.15 mn 0.15 o 2 , the ammonium salt is ammonium oxalate (NH 4 ) 2 C 2 o 4 . The amount of residual lithium on the surface of high-nickel cathode materials (LiOH, Li 2 CO 3 ), according to the amount of residual lithium to calculate the required (NH 4 ) 2 C 2 o 4 Theoretical dosage, where (NH 4 ) 2 C 2 o 4 The amount of addition and the amount of residual lithium on the surface (Li + ) The molar ratio is 1:2, the high nickel cathode material and (NH 4 ) 2 C 2 o 4 Mix well by ball milling for 2h. Then carry out pre-reaction, pre-react at 100°C for 3 hours, and the heating rate is 5°C / min; then heat up to 300°C and sinter for 4 hours, the heating rate is 5°C / min, and the surface residual lithium is modified into Li 2 C 2 o4 High-nickel ternary positive electrode material for lithium-ion batteries, the thickness of the coating layer is about 100nm. Its SEM picture is as follows figure 2 As shown, it...

Embodiment 2

[0038] Select high nickel cathode material LiNi 0.8 co 0.15 al 0.05 o 2 , the ammonium salt is ammonium acetate CH 3 COONH 4 . The preparation method is the same as in Example 1, wherein CH 3 COONH 4 The amount of addition and the amount of residual lithium on the surface (Li + ) with a molar ratio of 1:1, changing the calcination parameters, pre-reacting at 90°C for 2 hours, and the heating rate is 5°C / min; then heating to 250°C for 2 hours, the heating rate is 5°C / min, and the surface residual Lithium modified to CH 3 COOLi's high-nickel ternary cathode material for lithium-ion batteries has a coating thickness of about 50nm.

Embodiment 3

[0040] Select high nickel cathode material LiNi 0.8 co 0.2 o 2 , the ammonium salt is ammonium citrate. Preparation method is with embodiment 1, wherein the addition of ammonium citrate and surface residual lithium amount (Li + ) with a molar ratio of 1:3, changing the calcination parameters, pre-reacting at 120°C for 6 hours, and the heating rate is 5°C / min; then raising the temperature to 600°C for 8 hours, and the heating rate is 5°C / min, the surface residual The high-nickel ternary positive electrode material for lithium-ion batteries modified from lithium to lithium citrate, the thickness of the coating layer is about 300nm.

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Abstract

The invention discloses a lithium ion battery high-nickel ternary positive electrode material, which has a chemical general formula of LiNixM1-xO2, wherein x is more than or equal to 0.5 and is less than 1, M is one or a variety of materials selected from Co, Mn and Al, the surface of the ithium ion battery high-nickel ternary positive electrode material is coated with a lithium salt coating layer, and the lithium salt is a lithium salt containing a -COOLi functional group. Compared to the material in the prior art, the material of the present invention has the following characteristics that the residual lithium on the surface of the high-nickel material is modified to form the stable lithium salt coating layer, such that the residual lithium on the surface can be removed, the protection layer can cover the surface of the material, the generation of lithium carbonate can be inhibited, and the crystal structure of the material cannot be destroyed. According to the present invention, thelithium ion battery high-nickel ternary positive electrode material has advantages of good cycle stability and good storage performance, and the preparation method is simple, easy-performing, economical and environmentally friendly, and has good application prospect. The invention further discloses a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of new energy materials. More specifically, the invention relates to a lithium-ion battery high-nickel ternary positive electrode material with a coating layer on the surface, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Due to their high specific capacity and good cycle performance, high-nickel materials are currently the main direction for the development of cathode materials. However, the residual lithium (LiOH and LiOH) on the surface of high nickel materials 2 CO 3 ) makes the alkalinity increase, and the slurry is easy to gel during the electrode fabrication process. Moreover, LiOH on the surface of the material is exposed to air and converted into Li 2 CO 3 , leading to the deterioration of battery storage performance and the increase of gas production. The above problems seriously restrict the application of high-nickel materials in lithium-ion battery cathode mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/36H01M4/60H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/505H01M4/525H01M4/60H01M10/0525Y02E60/10
Inventor 况新亮陈玉君汪龙柳娜
Owner CONTEMPORARY AMPEREX TECH CO
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