Sustainable Encapsulation Strategy of Silicon Nanoparticles in Microcarbon Sphere for High-Performance Lithium-Ion Battery Anode

Title
Sustainable Encapsulation Strategy of Silicon Nanoparticles in Microcarbon Sphere for High-Performance Lithium-Ion Battery Anode
Authors
김상옥정훈기김형석권현정신현지황장연곽원진
Keywords
Li-ion batteries; Hydrothermal synthesis; Silicon anode; Encapsulation; High energy
Issue Date
2020-09
Publisher
ACS sustainable chemistry & engineering
Citation
VOL 8-14158
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 (∼3 μm). 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 high-energy and low-cost Si?C composite anode.
URI
http://pubs.kist.re.kr/handle/201004/72040
ISSN
2168-0485
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KIST Publication > Article
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