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The preparation method of high -nickel tripular positive materials for lithium -ion batteries covered with lithium salt covered layers and lithium ion batteries

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as damage, uneven distribution of lithium precipitation, chemical delithiation, etc., and achieves simple operation, easy popularization and application, storage The effect of performance and loop performance improvements

Active Publication Date: 2021-02-19
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 inhibit the generation of lithium carbonate, and the crystal structure of the material will not be destroyed, and the high-nickel ternary positive electrode material and its preparation are used for the surface of the lithium-ion battery coated with a lithium salt coating layer method, lithium-ion battery

Method used

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  • The preparation method of high -nickel tripular positive materials for lithium -ion batteries covered with lithium salt covered layers and lithium ion batteries
  • The preparation method of high -nickel tripular positive materials for lithium -ion batteries covered with lithium salt covered layers and lithium ion batteries
  • The preparation method of high -nickel tripular positive materials for lithium -ion batteries covered with lithium salt covered layers and lithium ion batteries

Examples

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Effect test

Embodiment 1

[0036] Select high nickel cathode material LiNi 0.65 Co0.15 Mn 0.15 O 2 , the ammonium salt is ammonium oxalate (NH 4 ) 2 C 2 O 4 . The residual lithium content (LiOH, Li 2 CO 3 ), according to the amount of residual lithium, the (NH) required for the complete reaction of residual lithium is calculated 4 ) 2 C 2 O 4 The theoretical amount of , where (NH 4 ) 2 C 2 O 4 The amount of addition and the amount of residual lithium on the surface (Li + ) in a molar ratio of 1:2, combining the high nickel cathode material with (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 3h, wherein the heating rate is 5°C / min; then the temperature is raised to 300°C for sintering for 4h, the heating rate is 5°C / min, and the surface residual lithium is modified into Li 2 C 2 O 4 The high-nickel ternary cathode material for lithium-ion batteries, the thickness of the coating layer is about 100nm. Its SEM image is as figu...

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 + ) in a molar ratio of 1:1, changing the calcination parameters, pre-reacting at 90 °C for 2 h, where the heating rate is 5 °C / min; then heating to 250 °C for 2 hours, with a heating rate of 5 °C / min, to obtain 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. The preparation method is the same as in Example 1, wherein the addition of ammonium citrate and the residual lithium amount on the surface (Li + ) in a molar ratio of 1:3, changing the calcination parameters, pre-reacting at 120 °C for 6 h, with a heating rate of 5 °C / min; then heating to 600 °C for 8 h, with a heating rate of 5 °C / min, to obtain surface residues. The thickness of the coating layer is about 300nm for the high-nickel ternary cathode material for lithium-ion batteries modified from lithium to lithium citrate.

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Abstract

The present invention discloses a preparation method for the surface covered with lithium -salt overwriting on the surface of lithium -ion batteries. The steps are: (1) the ‑COONH 4 The ammonium salt and the surface of the high -nickel ternary urban material with residual lithium are mixed with solid phase, and the particle size D of ammonium salt meets 0.1 μm ≤D <2 μm;React with the lithium lithium on the surface of the high nickel ternary positive material to obtain the high nickel ternary ivory material covered with lithium salt overwrite; the chemical general formula of high nickel tripular positive materials is lini x M 1‑x O 2 Among them, 0.5 ≤ x <1, M are several types of CO, Mn, Al, and the lithium salt covered layer covered with high nickel tripular positive pole material surface is the lithium salt of the lithium salt sample containing ‑cooli functional group.The residual lithium on the surface of the ternary orthopedic material is modified to form a stable lithium salt cover layer, which can remove the surface residual lithium and cover it on the surface of the material to form a protective layer.The crystal structure of the material.

Description

technical field [0001] The invention belongs to the field of new energy materials, and more particularly, the invention relates to a high-nickel ternary positive electrode material coated with a lithium salt coating layer on the surface of a lithium ion battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] High-nickel materials are the main development direction of cathode materials due to their high specific capacity and good cycle performance. However, the residual lithium on the surface of high nickel materials (LiOH and Li 2 CO 3 The existence of ) increases its alkalinity, and the slurry is easy to gel during the electrode fabrication process. Also, LiOH on the surface of the material is exposed to air and converted to Li 2 CO 3 , resulting in deterioration of cell storage performance and increase in gas production. The above problems seriously restrict the application of high-nickel materials in cathode materials for lithi...

Claims

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Application Information

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Patent Type & Authority Patents(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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