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| Type |
Symposium |
| Area |
Electrochemical Energy Conversion and Storage: Progress and New Challenges |
| Room No. |
Room 320 |
| Time |
THU 15:40-: |
| Code |
ELEC1-1 |
| Subject |
Elastic spongy graphene-functionalized silicon as excellent stability anode in Li ion battery |
| Authors |
Chunfei Zhang, Jong-Sung Yu1,*
Faculty of Maritime and Transportation, Ningbo University, China
1Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science & Technology, Korea
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| Abstract |
Silicon can make alloy with lithium in the form of Li22Si5 to deliver a highest theoretical gravimetric capacity of ~4200 mAh g-1, and thus is considered to be one of the most promising anode materials for next generation Li ion battery. However, those advantages are seriously offset by a great challenge of large volume expansion during lithiation, which causes a serious damage to the electrode structure and thus gives rise to a fast decay of the specific capacity [1]. In this work, novel 3D spongy grapheme (SG)-functionalized silicon is for the first time demonstrated by chemical vapor deposition for a LIB anode, which can overcome the common silicon anode issues such as poor conductivity and volume expansion of Si as well as transfer of Li ion towards the Si. The elastic feature of graphene has excellent function to self-adaptively buffer the volume variation during charge-discharge process. In addition, different from traditional graphene or carbon shells (core-shell and yolk-shell), the spongy 3D graphene networks provide much improved unique functions with excellent long-cycle stability and rate capability. The Si@SG electrode exhibits excellent cycling performance with high reversible specific capacity [2]. A superior 95% capacity retention is achieved after 510 cycles.
References
[1] M. Zhou, X. Li, B, Wang, Y, Zhang, et al. Nano Lett. 15 (2015) 6222-6228.
[2] C. Zhang, T.-H. Kang, J.-S. Yu, Nano Research, 11(2018) 233-245.
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| E-mail |
jsyu@dgist.ac.kr |
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122nd General Meeting of the KCS