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4.7 V-grade lithium cobalt oxide positive electrode material, preparation method thereof and corresponding battery

A positive electrode material, lithium cobalt oxide technology, applied in the field of 4.7V lithium cobalt oxide positive electrode material and its preparation, can solve the problem of low capacity of lithium cobalt oxide positive electrode material, achieve good cycle stability, simple preparation process effect

Pending Publication Date: 2021-11-05
珠海兴辰研创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of low capacity of the existing lithium cobalt oxide positive electrode material, the purpose of the present invention is to provide a 4.7V lithium cobalt oxide positive electrode material and its preparation method and corresponding battery, while increasing the charging cut-off voltage to achieve high capacity, it has stable cycle performance

Method used

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  • 4.7 V-grade lithium cobalt oxide positive electrode material, preparation method thereof and corresponding battery
  • 4.7 V-grade lithium cobalt oxide positive electrode material, preparation method thereof and corresponding battery
  • 4.7 V-grade lithium cobalt oxide positive electrode material, preparation method thereof and corresponding battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take Co respectively 3 o 4 , Li 2 CO 3 and EuCl 3 ·6H 2 O is fed according to the molar ratio of Co, Li and Eu at 1:1.05:0.02, and the EuCl 3 ·6H 2 O was dissolved in distilled water, and then Co 3 o 4 , stirred at 80°C until all the water evaporated, and then mixed with Li 2 CO 3 Mix well and place in a muffle furnace for high-temperature sintering. The sintering process is as follows: raise the temperature to 1000°C at a rate of 5°C / min, keep it warm for 12 hours, and collect the sintered product after natural cooling; High-temperature sintering in the Fu furnace, the secondary sintering process is as follows: raise the temperature to 900°C at a rate of 5°C / min, keep the heat for 10 hours, collect the secondary sintering products after natural cooling; the final product is obtained after the secondary sintering products are crushed .

Embodiment 2

[0039] Take Co respectively 3 o 4 , Li 2 CO 3 and Gd(NO 3 ) 3 ·6H 2 O is fed at a molar ratio of Co, Li, and Gd of 1:1.05:0.02. Gd(NO 3 ) 3 ·6H 2 O was dissolved in distilled water, and then Co 3 o 4 , stirred at 80°C until all the water evaporated, and then mixed with Li 2 CO 3 Mix well and place in a muffle furnace for high-temperature sintering. The sintering process is as follows: raise the temperature to 1100°C at a rate of 5°C / min, keep it warm for 10 hours, and collect the sintered product after natural cooling; High-temperature sintering in a furnace, the secondary sintering process is as follows: raise the temperature to 1000°C at a rate of 5°C / min, keep the heat for 4 hours, collect the secondary sintering products after natural cooling; the final product is obtained after the secondary sintering products are crushed .

Embodiment 3

[0041] Take Co respectively 3 o 4 , Li 2 CO 3 and Ho 2 (SO 4 ) 3 ·8H 2 O is fed according to the Co, Li, Ho molar ratio of 1:1.05:0.02. Ho first 2 (SO 4 ) 3 ·8H 2 O was dissolved in distilled water, and then Co 3 o 4 , stirred at 80°C until all the water evaporated, and then mixed with Li 2 CO 3 Mix well and place in a muffle furnace for high-temperature sintering. The sintering process is as follows: raise the temperature to 1200°C at a rate of 5°C / min, keep it warm for 12 hours, and collect the sintered product after natural cooling; High-temperature sintering in a furnace, the secondary sintering process is as follows: raise the temperature to 1000°C at a rate of 5°C / min, keep the heat for 4 hours, collect the secondary sintering products after natural cooling; the final product is obtained after the secondary sintering products are crushed .

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Abstract

The invention discloses a 4.7 V-grade lithium cobalt oxide positive electrode material, a preparation method thereof and a corresponding battery, and belongs to the technical field of lithium ion batteries. The positive electrode material is of a core-shell structure, and the core is lithium cobalt oxide; the shell layer is rare earth metal doped lithium cobalt oxide, the position of Li < + > is replaced by rare earth metal ions, and the doping depth is 1-200nm on the surface of the lithium cobalt oxide; the rare earth metal ions have 4f orbits. The preparation method comprises the following steps: (1) preparing a rare earth metal source, a cobalt source and a lithium source in proportion to form a mixture; (2) calcining the mixture at 800-1200 DEG C for 4-24 hours to obtain a primary calcined product; (3) crushing the primary calcined product, and performing secondary calcination at 800-1200 DEG C for 4-24 hours to obtain a lithium cobalt oxide crude product; and (4) crushing the lithium cobalt oxide crude product to obtain a finished product. The first reversible capacity of the positive electrode material reaches up to 240.1 mAh / g under the charging cut-off voltage of 4.7 V, and the cycling stability is good.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a 4.7V grade lithium cobalt oxide positive electrode material, a preparation method thereof and a corresponding battery. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics, electric vehicles, aerospace and other fields due to their high energy density and power density, long cycle life, no memory effect, and environmental friendliness. With the rapid development of the Internet industry and the advent of the 5G era, people's demand for battery life of mobile terminals (such as smartphones, VR glasses, drones, small robots, etc.) is getting higher and higher. As the core power component of mobile terminals, the energy density of lithium-ion batteries has become the core of consumers' demands. The composition of lithium-ion batteries includes positive electrodes, negative electrodes, electrolytes, separators, and battery packagi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/36H01M4/525H01M4/62H01M10/0525
CPCC01G51/42C01G51/70H01M4/628H01M4/366H01M4/525H01M10/0525H01M2004/028C01P2004/84C01P2004/03C01P2002/72C01P2006/40Y02E60/10
Inventor 徐蕾
Owner 珠海兴辰研创科技有限公司
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