Synthesis of Sn-based nanostructured anode materials by cathodic deposition and their electrochemical properties for Li-ion batteries = 전해전착법을 이용한 리튬이차전지용 주석계 나노전극재료의 제조 및 그 전기화학적 특성에 관한 연구

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As an increasing demand on advanced power sources with higher capacity and higher energy density compared to conventional batteries, research for new electrode materials for Li-ion batteries has become more intense. Currently, graphite anodes are insufficient to meet the needs of high-capacity batteries because of their low theoretical capacity of 372 mAh g-1. Among the various alternative materials for graphite, Sn is one of the most attractive anode materials due to its high theoretical capacity of 991 mAh g-1. However, pure Sn anode has not been put to practical use because of the poor cycle stability originating from the significant volumetric changes (up to approximately 360 %) that occurs during alloying/dealloying with Li. The pulverization of Sn anode caused by such volume changes may produce failures in electrical contacts between Sn and current collector, thereby reducing the cyclic performance. To overcome those problem of Sn anode, in this study, diverse Sn-based anode materials have been designed based on the following three strategies; i) to use an porous substrate that offers pores to accommodate the volumetric expansion of active materials and enhances the bond between the active materials and current collector, ii) to introduce inactive phases to act as a buffer matrix against the volumetric expansion of the active phase, iii) to reduce the particle size of active materials for minimizing their structural changes during cycling. Each part adopted one or two strategies to prepare a high performance electrode material. 1) Synthesis of Sn anode electrodeposited on porous Cu foam substrate. A three-dimensional Sn electrode was prepared by electrodeposition using a porous Cu foam as a substrate that consists of grape-like Cu nanodeposits. The electrochemical performance of the Sn/Cu foam electrode showed better cyclic performance and higher charge capacity than Sn electrode electrodeposited on the smooth Cu foil. The improvement in the cyclic perfo...
Advisors
Kwon, Hyuk-Sangresearcher권혁상
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
2012
Identifier
511851/325007  / 020107034
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2012.8, [ xi, 186 p. ]

Keywords

Tin; anode; cathodic deposition; 주석; 음극; 전해 전착법; 리튬이온전지; lithium ion battery

URI
http://hdl.handle.net/10203/181969
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=511851&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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