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Boron-doped lithium-rich anode material for lithium ion batteries and preparation method of material

一种富锂正极材料、锂离子电池的技术，应用在锂离子电池材料和电化学领域，能够解决循环容量骤减、循环性能一般、限制商业化应用等问题，达到振实密度提升、产物颗粒均匀细小、稳定性提高的效果

Active Publication Date: 2013-11-27
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although lithium-rich materials have high specific capacity, their cycle performance is average, especially after 150 cycles, due to the spinel phase transition and particle fragmentation and surface corrosion, the cycle capacity drops sharply (ACSNano, 2013, 7(1 ), pp760–767), even less than 100mAh / g after 300 cycles, and will decay to 0 in the end, which greatly limits its commercial application
Therefore, in order to improve the long-term cycle performance of lithium-rich materials, the material needs to be modified accordingly, but so far there has been no literature report on the improvement of long-term cycle stability of lithium-rich materials.

Method used

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  • Boron-doped lithium-rich anode material for lithium ion batteries and preparation method of material
  • Boron-doped lithium-rich anode material for lithium ion batteries and preparation method of material
  • Boron-doped lithium-rich anode material for lithium ion batteries and preparation method of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 sol-gel method synthesizes the ternary lithium-rich material Li[Li] doped with boron 2%. 0.2 mn 0.534 Ni 0.123 co 0.123 B 0.02 ]O 2

[0035] Take 3.215g of lithium acetate, 0.788g of nickel acetate, 3.229g of manganese acetate, 0.789g of cobalt acetate, 0.031g of boric acid, 12.615g of citric acid and 4.966g of ethylene glycol and dissolve them in 350ml of deionized water, stir and mix well, Put it in a pear-shaped bottle, and then rotate it in a rotary evaporator, the temperature is set at 80° C., and the rotation speed is 55 rpm. After steaming into a gel, place it in a vacuum oven at 150°C for more than 5 hours. Take out the dried gel, grind it and place it in a tube furnace for pre-calcination at 450°C for 4 hours, followed by calcination at 900°C for 15 hours to obtain the target product—a ternary lithium-rich material doped with 2% boron Li[Li 0.2 mn 0.534 Ni 0.123 co 0.123 B 0.02 ]O 2 .

[0036] The scanning electron microscope image of...

Embodiment 2

[0039] Embodiment 2 sol-gel method synthesizes the ternary lithium-rich material Li[Li] doped with boron 4% 0.2 mn 0.52 Ni 0.12 co 0.12 B 0.04 ]O 2

[0040] Take 3.215g of lithium acetate, 0.747g of nickel acetate, 3.191g of manganese acetate, 0.748g of cobalt acetate, 0.062g of boric acid, 12.610g of citric acid and 4.969g of ethylene glycol and dissolve them in 350ml of deionized water, stir and mix well. Put it in a pear-shaped bottle, and then rotate it in a rotary evaporator, the temperature is set at 80° C., and the rotation speed is 55 rpm. After steaming into a gel, place it in a vacuum oven at 150°C for more than 5 hours. The dried gel was taken out, crushed and placed in a tube furnace for pre-calcination at 450°C for 4 hours, followed by calcination at 900°C for 15 hours to obtain the target product.

[0041] Mix the target product with carbon black and PVDF at a mass ratio of 8:1:1, grind evenly with N-methylpyrrolidone as a solvent, then coat it on an alumi...

Embodiment 3

[0043] Example 3 The sol-gel method synthesizes the ternary lithium-rich material Li[Li] doped with boron 8%. 0.2 mn 0.514 Ni 0.103 co 0.103 B 0.08 ]O 2

[0044] Take 3.221g of lithium acetate, 0.667g of nickel acetate, 3.107g of manganese acetate, 0.665g of cobalt acetate, 0.125g of boric acid, 12.626g of citric acid and 4.966g of ethylene glycol and dissolve them in 350ml of deionized water, stir and mix evenly. Put it in a pear-shaped bottle, and then rotate it in a rotary evaporator, the temperature is set at 80° C., and the rotation speed is 55 rpm. After steaming into a gel, place it in a vacuum oven at 150°C for more than 5 hours. The dried gel was taken out, crushed and placed in a tube furnace for pre-calcination at 450°C for 4 hours, followed by calcination at 900°C for 15 hours to obtain the target product.

[0045] Mix the target product with carbon black and PVDF at a mass ratio of 8:1:1, grind evenly with N-methylpyrrolidone as a solvent, then coat it on a...

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Abstract

The invention discloses a boron-doped lithium-rich anode material for lithium ion batteries and a preparation method of the material. The chemical formula of the material provided by the invention is Li[LiaMnbCocNidBx]O2, wherein the sum total of a, b, c, d, and x equals 1, a, b and x are greater than 0, c is greater than or equal to 0, and the sum total of c and d is greater than 0. The material, provided by the invention and prepared through a coprecipitation method and a sol-gel method, is doped with a relatively small amount of boron element but achieves a very remarkable effect, and the stability of the material can be greatly improved just by doping 2% boron; meanwhile, the tap density of the material is increased due to the doping of boron; the coprecipitation method for synthesizing the material is convenient for industrial mass production; the sol-gel method has simple steps, the granules of the synthesized product are uniform and fine.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials and electrochemistry, and relates to a boron-doped lithium-rich manganese-based positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery with the characteristics of repeatable charge and discharge. It has been developed for about 20 years so far. Its application involves many fields such as entertainment, transportation, military, medical and communication. Lithium-ion battery electric vehicles have high application prospects due to their environmental friendliness. However, due to the limitation of specific energy, electric vehicles cannot be widely promoted and popularized. At present, it is mainly the positive electrode material that limits the specific energy of the battery, and the mainstream ones on the market are LiCoO 2 、LiFePO 4 , LiMn 2 o 4 And so on, its specific capacity is lower than 200mAh / g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122C01G45/1228C01G53/50C01P2002/50C01P2002/52C01P2002/54C01P2002/72C01P2004/03C01P2006/11C01P2006/40H01B1/08H01M4/505H01M4/525Y02E60/10C01B13/36C01G45/006C01G51/006C01G51/50C01G53/006H01M4/0471H01M4/0497H01M4/131H01M2004/028
Inventor 李彪马进夏定国
Owner PEKING UNIV
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