Preparation of rod-like silicon-based material by carbon reduction and its application in lithium slurry batteries

doi:10.19799/j.cnki.2095-4239.2022.0751

Abstract

Abstract:

In this study, a gel-like silica/carbon precursor was obtained by the hydrothermal method, with PEO-PPO-PEO(P123) as the structure directing agent, tetraethyl orthosilicate (TEOS) as the silicon source, and citric acid as the carbon source. The solvent was removed by rotary evaporation. The rod-like carbon-coated silicon oxide-negative material was obtained through high-temperature heat treatment, which improved the performance of the silicon-carbon material in the slurry system without a tight binding environment. The structure and morphology of this material were characterized by X-ray diffraction, inorganic element analyzer, specific surface area and porosity analyzer, and scanning electron microscope. The rod-like silicon-based material was joined end to end to form a lotus chain bundle having a length of about 1～3 μm, diameter of about 200 nm, pore size of 6.9 nm, and specific surface area of 282 m2/g This material and a single-walled carbon nanotube conductive agent with tube length >5 μm, specific surface area of 900 m²/g, and diameter of 1～2 nm form a multistage network of long and short range complementary in the electrolyte system. In addition, the presence of a large number of mesoporous materials was conducive to maintaining the suspension stability of slurry. The electrochemical performance test of the Swagelok battery showed that the initial discharge capacity was 1300 mAh/g, charging capacity was 726 mAh/g, and the coulombic efficiency was 55.8%. At 0.05 C, the charging capacity changed from 726 mAh/g to 557 mAh/g after 50 cycles, and the specific capacity retention rate was 76.7%. This work directly introduced carbon sources in the process of preparing silica with P123 as the structure guide agent and obtained silica-based materials with both carbon coating and carbon-reducing silica at the same time. Thus, this process avoided the complex technological process caused by magnesium thermal reduction of silica and recarbon coating.

Key words: lithium slurry battery, anode material, rod-like silicon -based material, carbon source

CLC Number:

TM 911

Jingjing RUAN, Fuyuan LIU, Shenshen LI, Guihong GAO, Yanxia LIU. Preparation of rod-like silicon-based material by carbon reduction and its application in lithium slurry batteries[J]. Energy Storage Science and Technology, 2023, 12(4): 1051-1058.

Figures/Tables 9

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References 11

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元素组成/%			原子比 Si/O
O	C	Si	原子比 Si/O
41.89	11.06	47.05	1.56

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