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Preparation method and application of amorphous carbon-based composite negative electrode material containing metalloid lithium

A technology of amorphous carbon and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of reducing the overall energy density of lithium metal composite negative electrodes, the gap in cycle performance, and the easy generation of lithium dendrites, etc., to achieve improved The effect of cycle stability, good support and good conductivity

Active Publication Date: 2022-01-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems that need to be solved urgently in the metal lithium negative electrode: firstly, lithium dendrites are easy to form, and lithium dendrites continue to grow during the battery cycle, which has the risk of piercing the separator and causing a short circuit of the battery, and is easy to break to form "dead lithium". , resulting in loss of lithium metal
However, most carbon materials are only carriers and do not play the role of active materials. Therefore, the high specific gravity of carbon carriers will reduce the overall energy density of metal lithium composite negative electrodes, and there is a certain gap in cycle performance compared with lithium-ion batteries.

Method used

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  • Preparation method and application of amorphous carbon-based composite negative electrode material containing metalloid lithium
  • Preparation method and application of amorphous carbon-based composite negative electrode material containing metalloid lithium
  • Preparation method and application of amorphous carbon-based composite negative electrode material containing metalloid lithium

Examples

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Embodiment 1

[0062] Example 1: Preparation of pitch-based hard carbon negative electrode material containing metalloid lithium by electrochemical method

[0063] Pitch is calcined in air at 300°C and then at 1000°C in an inert atmosphere to obtain pitch-based hard carbon. In the hard carbon of this embodiment, the distance between carbon layers or the size of nanopores composed of disordered carbon is 0.39nm, the average particle size is 15 μm, and the specific surface area is 2m 2 g -1 , mix hard carbon, CMC, SBR and Super P conductive carbon black in a ratio of 90:3:3:4, coat it on copper foil, and use it as an amorphous carbon negative electrode after vacuum drying, such as figure 1 As shown, metal lithium sheet is used as counter electrode, Celgard 2325 is used as battery separator, EC+DEC+DMC(1:1:1vol)+5vol%FEC+1M LiPF 6 As the electrolyte, a lithium / carbon half-cell was prepared. By electrochemical lithiation, lithiation refers to: put the half-cell voltage below 0V, and use the ...

Embodiment 2

[0064] Example 2: Preparation of Kuraray hard carbon negative electrode material containing metalloid lithium by electrochemical method

[0065] In order to illustrate the universality of the preparation method of metalloid lithium, the hard carbon anode material was prepared with the commercial hard carbon material of Kuraray Company. The Kuraray hard carbon used in this example has a nanopore size of 0.38nm, an average particle size of 9μm, and a specific surface area of ​​4m 2 g -1 . Mix Kuraray hard carbon, CMC, SBR and Super P conductive carbon black in a ratio of 90:3:3:4, coat it on copper foil, and use it as the negative electrode of amorphous carbon after vacuum drying. Counter electrode, use Celgard 2325 as battery separator, EC+DEC+DMC(1:1:1vol)+5vol%FEC+1MLiPF 6 As an electrolyte, a lithium / carbon half-cell is prepared by electrochemical lithiation. Lithiation refers to: put the half-cell voltage below 0V, and use the maximum capacity before the nucleation over...

Embodiment 3

[0066] Embodiment 3: Preparation of soft carbon negative electrode material containing metalloid lithium by electrochemical method

[0067] The pitch is calcined in an inert atmosphere at 300°C for 1 hour and then raised to 800°C for 2 hours to obtain pitch-based soft carbon. In the soft carbon of this embodiment, the distance between carbon layers or the size of nanopores composed of disordered carbon is 0.37nm, the average particle size is 12μm, and the specific surface area is 20m 2 g -1 . Mix pitch-based soft carbon, CMC, SBR, and Super P conductive carbon black in a ratio of 90:3:3:4, coat it on copper foil, and use it as an amorphous carbon negative electrode after vacuum drying, such as image 3 As shown, metal lithium sheet is used as counter electrode, Celgard 2325 is used as battery separator, EC+DEC+DMC(1:1:1vol)+5vol%FEC+1M LiPF 6 As the electrolyte, a lithium / carbon half-cell was prepared. By electrochemical lithiation, lithiation refers to: put the half-cell...

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Abstract

The invention provides a preparation method and application of an amorphous carbon-based composite negative electrode material containing metalloid lithium. An amorphous carbon electrode is prepared from amorphous carbon, a binder and a conductive agent, the amorphous carbon electrode is used as a negative electrode, and lithiation is performed on the amorphous carbon negative electrode, so that the amorphous carbon-based composite negative electrode material is obtained, and the amorphous carbon-based composite negative electrode material contains metalloid lithium. The amorphous carbon-based composite negative electrode disclosed by the invention is used as the negative electrode of an energy storage battery and has excellent conductivity, and nano-scale pores formed by disordered carbon in the amorphous carbon-based composite negative electrode provide a special confinement space for the reversible storage of metalloid lithium, so that the reaction of an electrolyte and metal lithium can be effectively reduced, and the cycling stability of the negative electrode is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method and application of an amorphous carbon-based composite negative electrode material containing metalloid lithium, belonging to the field of carbon-based negative electrode materials for energy storage batteries. Background technique [0002] Reducing the burning of fossil fuels and developing new energy sources are effective solutions to alleviate the greenhouse effect and meet the increasing energy demand of human society. However, the current commercial lithium-ion batteries cannot meet consumers' demand for long battery life. In order to deal with this problem, the development of energy storage materials with high energy density has become a research hotspot of new energy materials. [0003] Due to the high theoretical specific capacity of metal lithium (3860mAh g -1 ) and extremely low electrochemical potential (-3.04Vvs.SHE), which can effectively improve the energy density of the battery as a negative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/587H01M4/382H01M4/62H01M4/621H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 李念武于乐苏凯金童
Owner BEIJING UNIV OF CHEM TECH
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