Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 26, Pages 9866-9874Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c02944
Keywords
molten-salt electrolysis; silicate; silicon-carbon composite; lithium-ion battery anode; magnesium oxide space holder
Categories
Funding
- Fundamental Research Funds for the Central Universities [N2025035, XLYC1807042]
- 111 Project [B16009]
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Fabricating hollow space between a Si core and C shell has been recognized as an efficient strategy for tailoring lithium-storage performances of the silicon-carbon composite anode by resolving the extreme volume expansion of Si. Here, we report a molten-salt electrolysis method for electroreducing carbon-encapsulated magnesium silicate to prepare a Si@voidp C composite in MgCl2-containing molten salt. The void space between carbon and silicon comes from the transition from silicate to Si as well as the removal of the in situ generated MgO, and the SiC is suppressed by tailoring the electrode potentials in MgCl2 containing molten salt. In other words, MgO serves as an inert space holder that can be removed by an acid leaching process to create void space. The obtained Si@void@C composite delivers a specific discharge capacity of 900 mAh/g at 1 A/g, even after 300 cycles with a discharge capacity retention rate of 75.5%. Therefore, this study paves an electrochemical pathway to prepare Si@void@C composite anodes using inexpensive feedstocks, and the void space can be tuned by adjusting the amount of MgO space holder.
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