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Surface double-coated lithium-enriched material and preparation method thereof

A lithium-rich material, double-coated technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of not being able to fully coat material particles, high cost, and difficult to coat in large quantities, to avoid Redox reaction, efficiency improvement, low cost effect

Inactive Publication Date: 2017-06-27
CHINA AUTOMOTIVE BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are limited by equipment and carbon sources. On the one hand, the cost is very high, on the other hand, it is difficult to coat in large quantities, and they can only be deposited on the pole pieces made of lithium-rich materials in advance, and cannot achieve comprehensive material particles. clad

Method used

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  • Surface double-coated lithium-enriched material and preparation method thereof
  • Surface double-coated lithium-enriched material and preparation method thereof
  • Surface double-coated lithium-enriched material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a method for preparing a double-coated lithium-rich material whose surface is coated with metal oxide and carbon, which includes the following steps:

[0044] (1) Metal oxide coating (TiO 2 ) preparation:

[0045] 10g lithium-rich material Li[Li 0.20 Ni 0.13 co 0.13 mn 0.54 ]O 2 Soak in 30mL ethanol solution with 0.51g tetrabutyl titanate added dropwise, keep stirring in a water bath at 15°C for 6 hours, filter, wash three times, dry in a vacuum thermostat at 100°C for 4 hours, and then heat at 500°C Sinter for 2 hours to get TiO 2 Coating amount of 1wt% Li[Li 0.20 Ni 0.13 co 0.13 mn 0.54 ]O 2 composite material.

[0046] (2) Preparation of carbon coating:

[0047] Coated the above with TiO 2 Li[Li 0.20 Ni 0.13 co 0.13 mn 0.54 ]O 2 The material is immersed in 15 mL of an aqueous solution containing 0.33 g of sucrose, continuously stirred in a water bath at 80°C until the liquid evaporates to dryness, and then dried in a vacuum...

Embodiment 2

[0053] This embodiment provides a method for preparing a lithium-rich material whose surface is double-coated with metal oxide and carbon, which includes the following steps:

[0054] (1) Metal oxide coating (ZrO 2 ) preparation:

[0055] 10g lithium-rich material Li[Li 0.20 Ni 0.13 co 0.13 mn 0.54 ]O 2 Immerse in 25mL of isopropanol solution with 0.16g of zirconium isopropoxide, stir at 25°C for 6 hours under sealed conditions, then keep stirring at 60°C until the solution evaporates to dryness, and dry in a vacuum thermostat at 100°C for 6 hours , and then heated up to 500°C at a heating rate of 5°C / min for 2 hours to obtain ZrO 2 Coated Li[Li 0.20 Ni 0.13 co 0.13 mn 0.54 ]O 2 material, the coating amount is 0.5wt%.

[0056] (2) Preparation of carbon coating:

[0057] The above-mentioned coated ZrO 2 Li[Li 0.20 Ni 0.13 co 0.13 mn 0.54 ]O 2 The material is immersed in 20mL of an aqueous solution containing 0.165g of glucose, continuously stirred in a water ...

Embodiment 3

[0062] This embodiment provides a method for preparing a lithium-rich material whose surface is double-coated with metal fluoride and carbon, which includes the following steps:

[0063] (1) Metal fluoride coating (AlF 3 ) preparation:

[0064] 10g lithium-rich material Li[Li 0.23 Ni 0.10 co 0.10 mn 0.57 ]O 2 Immerse in 15mL of an aqueous solution containing 0.28g of aluminum nitrate, slowly add 10mL of an aqueous solution of 0.4g of ammonium fluoride dropwise under stirring conditions, and after the dropwise addition, keep stirring the mixed solution in a water bath at 50°C for 3 hours After that, filter, wash three times, dry in a vacuum oven at 100°C for 4 hours, and then sinter at 400°C for 2 hours to obtain 1wt% AlF 3 Coated Li[Li 0.23 Ni 0.10 co 0.10 mn 0.57 ]O 2 composite material.

[0065] (2) Preparation of carbon coating:

[0066] Coated the above AlF 3 Li[Li 0.23 Ni 0.10 co 0.10 mn 0.57 ]O 2 Materials, dipped into 20mL of aqueous solution containi...

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Abstract

The invention discloses a surface double-coated lithium-enriched material and a preparation method thereof. The surface double-coated material is a composite material formed by sequentially coating the outer surface of a lithium-enriched material with a metal compound layer and a carbon layer, wherein the lithium-enriched material has a chemical formula of Li<1+>xMnyMzAwOr, M is at least one of Ni, Co, Al, Mg, Ti, Fe, Cu, Cr, Mo, Zr, Ru and Sn, and A is at least one of S, P, B and F; and x is more than 0 and less than or equal to 1, y is more than 0 and less than or equal to 1, z is more than or equal to 0 and less than 1, w is more than or equal to 0 and less than or equal to 0.2, and r is more than or equal to 1.8 and less than or equal to 3. The preparation method comprises the following steps: preparing a soluble metal salt solution; soaking the lithium-enriched material in the solution, adding a precipitator, stirring, filtering, drying and heating; soaking the heated sample in a carbon source-contained solution for stirring, and drying; heating and carbonizing the dried sample at a protective atmosphere to obtain the surface double-coated lithium-enriched material. According to the surface double-coated lithium-enriched material, the stability and conductivity of the material structure can be improved, and the circulating performance and rate performance of the lithium-enriched material can be improved.

Description

technical field [0001] The invention relates to a surface double-coated lithium-rich material and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the depletion of fossil energy and the increasingly serious environmental problems, it is necessary to look for other high-efficiency and environmentally friendly alternatives. To 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. The current commercial cathode materials mainly include LiCoO 2 、LiFePO 4 , LiMn 2 o 4 , Ternary material, its specific capacity is lower than 200mAh / g. The cathode material is the main factor limiting the specific energy of the battery. Therefore, in order to develop a hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/624H01M4/625Y02E60/10
Inventor 庄卫东王振尧刘祥欢高敏卢世刚王琳
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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