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Surface modified coated lithium-rich material, preparation method thereof and lithium ion battery

A technology of lithium-rich materials and surface modification, which is applied in the direction of battery electrodes, secondary batteries, and active material electrodes, can solve the problems that lithium-rich materials cannot be solved at the same time, achieve improved first-time efficiency, good reproducibility of results, and preparation The effect of simple process

Active Publication Date: 2018-06-15
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, at present, single coating and doping often cannot solve many problems existing in lithium-rich materials at the same time.

Method used

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  • Surface modified coated lithium-rich material, preparation method thereof and lithium ion battery
  • Surface modified coated lithium-rich material, preparation method thereof and lithium ion battery
  • Surface modified coated lithium-rich material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Surface-modified coated lithium-rich material Li 1.2 mn 0.58 Ni 0.13 co 0.13 S 0.03 o 2.2 Preparation of:

[0058] 1) Prepare lithium-rich material Li with the method of comparative example 1 1.2 mn 0.54 Ni 0.13 co 0.13 o 2

[0059] 2) Preparation of coating layer

[0060] Add the lithium-rich material to 0.2mol / L manganese acetate solution, and keep stirring in a 50°C water bath until dry; the molar ratio of manganese acetate to lithium-rich material is 0.04:1. The dried material was sintered at 600° C. for 5 hours to obtain a lithium-rich material coated with manganese oxide.

[0061] 3) Solution processing

[0062] Add 0.1 mol / L ammonium sulfate solution to the manganese oxide-coated lithium-rich material obtained in step (2), and keep stirring in a 60°C water bath until dry; the molar ratio of ammonium sulfate to lithium-rich material is 0.03:1. The dried material was sintered at 400°C for 2 hours to obtain the ammonium sulfate-modified coated lithium-...

Embodiment 2

[0064] Surface-modified coated lithium-rich material Li 1.2 mn 0.64 Ni 0.13 co 0.13 P 0.05 o 2.3 Preparation of:

[0065] 1) Prepare lithium-rich material Li with the method of comparative example 1 1.2 mn 0.54 Ni 0.13 co 0.13 o 2

[0066] 2) Preparation of coating layer

[0067] Same as step 2 in Example 1, the molar ratio of manganese acetate to lithium-rich material was changed to 0.05:1.

[0068] 3) Solution processing

[0069] Add 0.1 mol / L ammonium phosphate solution to the manganese oxide-coated lithium-rich material obtained in step (2), and keep stirring in a 60°C water bath until dry; the molar ratio of ammonium phosphate to lithium-rich material is 0.05:1. The dried material was sintered at 500°C for 4 hours to obtain the ammonium phosphate-modified coated lithium-rich material Li 1.2 mn 0.64 Ni 0.13 co 0.13 P 0.05 o 2.3 .

Embodiment 3

[0071] Surface-modified coated lithium-rich material Li 1.23 mn 0.57 Ni 0.2 al 0.16 B 0.02 o 2.27 Preparation of:

[0072] 1) Prepare lithium-rich material Li with the method of comparative example 1 1.23 mn 0.57 Ni 0.2 o 2

[0073] 2) Preparation of coating layer

[0074] Same as step 2 in Example 1, the molar ratio of aluminum nitrate to lithium-rich material was changed to 0.16:1.

[0075] 3) Solution processing

[0076] Add 0.05 mol / L boric acid solution to the alumina-coated lithium-rich material obtained in step (2), and keep stirring in a 70°C water bath until dry; the molar ratio of boric acid to lithium-rich material is 0.02:1. The dried material was sintered at 600°C for 7 hours to obtain the boric acid-modified coated lithium-rich material Li 1.23 mn 0.57 Ni 0.2 al 0.16 B 0.02 o 2.27 .

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Abstract

The invention discloses a surface modified coated lithium-rich material, a preparation method thereof and a lithium ion battery. The surface modified coated lithium-rich material disclosed by the invention comprises a modification layer, a coating layer and a lithium-rich material layer from outside to inside in sequence, wherein the modification layer comprises one of S, P, Si, B and F or the combination of two or more than two of S, P, Si, B and F; and the coating layer comprises a metal oxide. Through the synergistic effect of coating and modification, the conductivity of the material is improved while the surface structure of the lithium-rich material is stabilized, and the electrochemical performance of the lithium-rich material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a surface-modified coated lithium-rich material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Due to the characteristics of high energy density, long cycle life, environmental protection, and low cost, lithium-ion batteries have developed rapidly in the past 20 years, and their applications involve communications, transportation, military, medical, entertainment, and many other fields. In recent years, with the rapid development of electric vehicles, high specific energy and high power lithium-ion batteries have become an inevitable direction for the development of lithium-ion batteries in the future. Currently commercial cathode materials such as LiCoO 2 、LiFePO 4 , LiMn 2 o 4 , ternary materials, etc., with low specific capacity (<200mAh / g). The cathode material is the main factor limiting the specific ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 王振尧任志敏刘洋孙学义卢世刚王忠
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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