Title:
SILICON COMPOSITE MATERIAL, PREPARATION METHOD THEREFOR, NEGATIVE PLATE AND LITHIUM ION BATTERY
Document Type and Number:
WIPO Patent Application WO/2022/156152
Kind Code:
A1
Abstract:
Disclosed are a silicon composite material, a preparation method therefor, a negative plate and a lithium ion battery. The silicon composite material comprises through-hole silicon and a carbon coating layer, wherein the through-hole silicon has a one-dimensional carbon material arranged in a pore channel thereof. For the through-hole silicon, with the one-dimensional carbon material arranged in the hole channel, which is provided by the embodiment of the present invention, the conductivity of silicon particles can be improved from the interior of the silicon material. Meanwhile, the pore channel of the through-hole silicon provides a good buffer space for the material, avoiding the volume expansion of the material. A network structure formed by interlacing the one-dimensional carbon material in the pore channel of the through-hole silicon can effectively constrain the volume expansion of the silicon material, such that the internal structure of the silicon particles is greatly stabilized, the problem of pulverization is solved, effectively maintaining a conductive network between the silicon particles, and the cycle performance of a battery prepared from the material is effectively improved. In addition, the arrangement of a carbon coating layer is beneficial for reducing the contact between the silicon composite material and electrolyte in the use process, such that side reactions are reduced, and the electronic conductivity of the silicon composite material can be further improved.
Inventors:
ZHANG MIN (CN)
YUAN HAO (CN)
HU DALIN (CN)
LIAO XINGQUN (CN)
YUAN HAO (CN)
HU DALIN (CN)
LIAO XINGQUN (CN)
Application Number:
PCT/CN2021/103975
Publication Date:
July 28, 2022
Filing Date:
July 01, 2021
Export Citation:
Assignee:
HUIZHOU HIGHPOWER TECH CO LTD (CN)
International Classes:
H01M4/38; B82Y30/00; B82Y40/00; C01B32/05; H01M4/134; H01M4/62; H01M10/0525
Domestic Patent References:
| WO2013147958A2 | 2013-10-03 |
Foreign References:
| CN112885998A | 2021-06-01 | |||
| CN106058256A | 2016-10-26 | |||
| CN103346324A | 2013-10-09 | |||
| CN110518213A | 2019-11-29 | |||
| CN111525110A | 2020-08-11 | |||
| CN106684335A | 2017-05-17 | |||
| CN104638240A | 2015-05-20 |
Attorney, Agent or Firm:
SHENZHEN ZHONGDING INTELLECTUAL PROPERTY AGENCY (CN)
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