Sustainable Encapsulation Strategy of Silicon Nanoparticles in Microcarbon Sphere for High-Performance Lithium-Ion Battery Anode
- Authors
- Shin, Hyeon-Ji; Hwang, Jang-Yeon; Kwon, Hyun Jung; Kwak, Won-Jin; Kim, Sang-Ok; Kim, Hyung-Seok; Jung, Hun-Gi
- Issue Date
- Sep-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Li-ion batteries; Hydrothermal synthesis; Silicon anode; Encapsulation; High energy
- Citation
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING, v.8, no.37, pp.14150 - 14158
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING
- Volume
- 8
- Number
- 37
- Start Page
- 14150
- End Page
- 14158
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/190735
- DOI
- 10.1021/acssuschemeng.0c04828
- ISSN
- 2168-0485
- Abstract
- Owing to the high theoretical capacity, low operating potentials, and natural abundance, silicon (Si) is considered as one of the most promising anode materials for lithium-ion batteries. However, a large volume change during alloying-dealloying often results in pulverization, electrical contact loss, and unstable solid-electrolyte interphase (SEI) formation, leading to rapid capacity fading. We present a rational encapsulation strategy of a silicon-carbon (Si-C) composite as a high-performance anode material for lithium-ion batteries (LIBs). The Si-C composite material is prepared via a one-pot hydrothermal method by using silicon nanoparticles modified using an etching route and sucrose as a carbon precursor. The proposed Si-C composite material has a meso-macroporous structure and contains a large weight fraction of silicon nanoparticles (40 wt %) encapsulated in a micrometric carbon sphere (similar to 3 mu m). In the composite material, the carbon framework tightly encapsulates the silicon nanoparticles to the interior of the particle, which not only provides electrical conductivity but also decreases the stress/strain of the material during the alloying-dealloying process. The material demonstrates high initial capacity of 1300 mAh g(-1), excellent capacity retention of 90% after 200 cycles, and fast charging-discharging capability within 12 min. We believe that the proposed encapsulation strategy here will be helpful in developing a highenergy and low-cost Si-C composite anode.
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