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Preparation method of LiZr2 (PO4) 3 coated lithium-rich material

A lithium-rich material and coating technology, applied in the field of LiZr23-coated lithium-rich materials and their preparation, can solve the problems of poor rate performance, voltage decay, and high material cost, and achieve improved rate charge-discharge performance, regular morphology, Evenly distributed effect

Inactive Publication Date: 2020-11-17
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ternary material LiNi x co y mn z o 2 is LiMO 2 (M=Ni, Co, Mn) The solid solution material of the three has a theoretical specific capacity as high as 275mAh / g, and an actual discharge capacity of 200mAh / g, but it also faces problems such as complex synthesis process, high material cost, and poor safety performance.
[0004] However, lithium-rich materials also have defects such as low electronic conductivity, poor rate capability, voltage decay, and low Coulombic efficiency, which limit their further development and application.

Method used

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  • Preparation method of LiZr2 (PO4) 3 coated lithium-rich material
  • Preparation method of LiZr2 (PO4) 3 coated lithium-rich material
  • Preparation method of LiZr2 (PO4) 3 coated lithium-rich material

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a LiZr2 (PO 4 ) 3 A method for preparing a coated lithium-rich material, comprising the following steps;

[0027] S1), the raw material Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O is mixed according to Ni:Co:Mn molar ratio 0.13:0.13:0.54, then adds the lithium acetate of 1.25mol;

[0028] S2), then add an appropriate amount of citric acid, and add distilled water to dissolve;

[0029] S3), stirring in a water bath at 80°C, dropping an appropriate amount of ammonia water during the stirring to dissolve the precipitate, stirring for 12 hours to obtain a purple gel, and then moving to a drying oven and drying at 80°C for 12 hours to obtain a dry gel;

[0030] S4), move the dry gel to a tube furnace, pre-calcine at 450°C for 5 hours, after the furnace cools down, take it out, grind the fluffy material fully, and then calcinate at 800°C for 10 hours to obtain the lithium-rich material Li 1.2 Ni 0.13 co 0.13 mn...

Embodiment 2

[0032] This embodiment provides a LiZr 2 (PO 4 ) 3 A method for preparing a coated lithium-rich material, comprising the following steps;

[0033] S1), the raw material Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O is mixed according to Ni:Co:Mn molar ratio 0.13:0.13:0.54, then adds the lithium acetate of 1.25mol;

[0034] S2), then add an appropriate amount of citric acid, and add distilled water to dissolve;

[0035] S3), stirring in a water bath at 80°C, dropping an appropriate amount of ammonia water during the stirring to dissolve the precipitate, stirring for 12 hours to obtain a purple gel, and then moving to a drying oven and drying at 80°C for 12 hours to obtain a dry gel;

[0036] S4), move the dry gel to a tube furnace, pre-calcine at 450°C for 5 hours, after the furnace cools down, take it out, grind the fluffy material fully, and then calcinate at 800°C for 10 hours to obtain the lithium-rich material Li 1.2 Ni 0.13 co 0.13 ...

Embodiment 3

[0040] This embodiment provides a LiZr 2 (PO 4 ) 3 A method for preparing a coated lithium-rich material, comprising the following steps;

[0041] S1), the raw material Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O is mixed according to Ni:Co:Mn molar ratio 0.13:0.13:0.54, then adds the lithium acetate of 1.25mol;

[0042] S2), then add an appropriate amount of citric acid, and add distilled water to dissolve;

[0043] S3), stirring in a water bath at 80°C, dropping an appropriate amount of ammonia water during the stirring to dissolve the precipitate, stirring for 12 hours to obtain a purple gel, and then moving to a drying oven and drying at 80°C for 12 hours to obtain a dry gel;

[0044] S4), move the dry gel to a tube furnace, pre-calcine at 450°C for 5 hours, after the furnace cools down, take it out, grind the fluffy material fully, and then calcinate at 800°C for 10 hours to obtain the lithium-rich material Li 1.2 Ni 0.13 co 0.13 ...

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PUM

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Abstract

The invention provides a preparation method of a LiZr2(PO4)3 coated lithium-rich material, which is based on the formation of a LiZr2(PO4)3 coating layer in an active substance, and is beneficial to improving the high-rate charge-discharge performance of the material. The method disclosed by the invention comprises the following steps: preparing a lithium-rich material Li<1.2>Ni<0.13>Co<0.13> Mn<0.54>O<2>; and coating the surface of the lithium-rich material with LiZr2(PO4)3 to obtain the lithium-rich material with different coating amounts of LiZr2(PO4)3. The lithium-rich material synthesizedby adopting a sol-gel method is small in particle, uniform in distribution and regular in morphology; the LiZr2(PO4)3 is coated with the lithium-rich material Li<1.2>Ni<0.13>Co<0.13> Mn<0.54>O<2> prepared by the preparation method disclosed by the invention, so the 1C rate charge-discharge performance is greatly improved.

Description

technical field [0001] The present invention relates to lithium ion battery material, especially a kind of LiZr 2 (PO 4 ) 3 Coated lithium-rich material and preparation method thereof. Background technique [0002] Lithium-ion batteries have been extensively studied due to their advantages such as high energy density, long cycle life, no memory effect and high safety performance. The current commercially used cathode material is mainly LiCoO 2 , LiMn 2 o 4 、LiFePO 4 and ternary materials. LiCoO 2 The material belonging to the layered structure has the advantage of high working voltage, and its theoretical specific capacity is 274mAh / g, but the discharge capacity in practical application is only 145mAh / g. Due to the lack of cobalt resources in the world, the high price of cobalt leads to the increasing production cost, and the poisonous cobalt is not conducive to the protection of the environment. Spinel LiMn 2 o 4 The material has the advantages of high working v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 李昌明吴涛叶嘉明
Owner WUYI UNIV