Hollow Graphene as an Expansion-Inhibiting Electrical Interconnector for Silicon Electrodes in Lithium-Ion Batteries
- Authors
- Park, Hyeong-Il; Park, You Kyung; Kim, Sun Kyung; Jang, Hee Dong; Kim, Hansu
- Issue Date
- Aug-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- silicon-based electrode; volume expansion; conductive agent; hollow graphene; electrode structure
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.13, no.30, pp.35759 - 35766
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 13
- Number
- 30
- Start Page
- 35759
- End Page
- 35766
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/141362
- DOI
- 10.1021/acsami.1c08969
- ISSN
- 1944-8244
- Abstract
- Huge volume changes of silicon particles upon alloying and dealloying reactions with lithium are a major reason for the poor cycle performance of silicon-based anodes for lithium-ion batteries. To suppress dimensional changes of silicon is a key strategy in attempts to improve the electrochemical performance of silicon-based anodes. Here, we demonstrate that a conductive agent can be exploited to offset the mechanical strain imposed on silicon electrodes caused by volume expansion of silicon associated with lithiation. Hollow graphene particles as a conductive agent inhibit volume expansion by absorbing the swelling of silicon upon lithiation through flattening the free voids surrounded by the graphene shell. As a result, silicon electrodes with hollow graphene showed a height expansion of 20.4% after full lithiation with a capacity retention of 69% after 200 cycles, while the silicon electrode with conventional carbon black showed an expansion of 76.8% under the same conditions with a capacity retention of 38%. Some of the deflated hollow graphene returns to its initial shape on delithiation due to the mechanical flexibility of the graphene shell layer. Such a robust microstructure of a silicon electrode incorporating hollow graphene that serves as both an expansion inhibitor and a conductive agent greatly improves capacity retention compared with silicon electrodes with the conventionally used carbon black.
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