期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 19, 页码 16449-16457出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b01614
关键词
elastic binder; chitosan; natural rubber; silicon anode; lithium-ion battery
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1D1A1B03930806]
- Ministry of Science, ICT and Future Planning of Korea [NRF-2016R1A2B40008389]
Polymeric binder is extremely important for Si based anode in lithium-ion batteries due to large volume variation during charging/discharging process. Here, natural rubber-incorporated chitosan networks were designed as a binder material to obtain both adhesion and elasticity. Chitosan could strongly anchor Si particles through hydrogen bonding, while the natural rubber could stretch reversibly during the volume variation of Si particles, resulting in high cyclic performance. The prepared electrode exhibited the specific capacities of 1350 mAh/g after 1600 cycles at the current density of 8 A/g and 2310 mAh/g after 500 cycles at the current density of 1 A/g. Furthermore, the cycle test with limiting lithiation capacity was conducted to study the optimal binder properties at varying degree of the volume expansion of silicon, and it was found that the elastic property of binder material was strongly required when the large volume expansion of Si occurred.
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