Citation: Xianping Du, Ying Huang, Chen Chen, Zhenhe Feng, Meng Zong. Encapsulating Si particles in multiple carbon shells with pore-rich for constructing free-standing anodes of lithium storage[J]. Chinese Chemical Letters, ;2024, 35(12): 109990. doi: 10.1016/j.cclet.2024.109990 shu

Encapsulating Si particles in multiple carbon shells with pore-rich for constructing free-standing anodes of lithium storage

Xianping Du ^a ,
Ying Huang ^{a, *,} ,
Chen Chen ^b ,
Zhenhe Feng ^c ,
Meng Zong ^{a, *,}

a.
MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
b.
School of Electrical Engineering, Xi'an University of Technology, Xi'an 710048, China
c.
Shanghai Institute of Space Power-sources, Shanghai 200245, China

yingh@nwpu.edu.cn

zongmeng@nwpu.edu.cn

Received Date: 1 April 2024
Revised Date: 20 April 2024
Accepted Date: 9 May 2024
Available Online: 10 May 2024

Figures(4)

Silicon based (Si-based) materials are considered to be the most promising anode materials for lithium-ion batteries (LIBs) due to their high specific capacity. However, the issues of poor electrical conductivity and volume expansion during cycling have not been effectively addressed. The optimum remedy is to select specific materials to establish an exceptional conductive and volume buffer structure to assist the Si materials to develop its excellent lithium storage properties. Here, Si particles were encapsulated into porous carbon fibers containing ultrafine Co particles (CP) to obtained Si-x@CP-y film. Among them, the addition of Si particles and the void structure was precisely regulated to achieve a superior electrode with a high specific capacity. Subsequently, the two-dimensional conductive material reduced graphene oxide (rGO) nanosheets were further incorporated to obtain Si-2@CP-2@rGO films with core@multi-shell structure. The final electrode was equipped with one-, two-, and three-dimensional electronic pathways to allow rapid electron transport, and featured with multi-layer buffer structure and reserved pores that could effectively mitigate volume changes. As expected, the free-standing Si-2@CP-2@rGO electrode delivered a high specific capacity of 1221.2 mAh/g after 100 cycles at 0.1 A/g in a half cell, and the assembled full cell showed 249.0 mAh/g after 200 cycles at 0.2 A/g, which fulfilled the lightweight requirement for new energy storage devices.
- Si particles, rGO nanosheets,
- Core@multi-shell,
- Free-standing anodes,
- lithium-ion batteries
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