Effects of surface morphological and micro-structural change on the electrochemical properties of Sn-based anode for lithium-ion battery = 리튬이차전지용 주석계 음극의 표면형상 및 미세구조 변화가 전기화학적 특성에 미치는 영향

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Sn has received much attention as an alternative anode material for lithium ion batteries due primarily to its high theoretical capacity (994 mAh g-1). Sn anodes, however, have exhibited poor cyclability due to the crumbling by severe volume expansion (up to about 260%) that occurs during alloying of $Li^{+}$ with Sn. In this study, Sn based anodes have been designed to improve their charge/discharge performances by adopting the two strategies; i) Synthesis of porous Sn anode with a multi-layered structure by electrodeposition, The electrochemical performance of a Sn electrode synthesized on Cu foil by electrodeposition in a pyrophosphate-based bath was examined by modifying its morphology by controlling the cathodic current density. As the cathode current density increased, the morphology of the electrodeposit changed from a smooth-compact structure to a microscopically multi-layered structure with open spaces between adjacent layers. The porosity of the multi-layered Sn electrode was measured to be more than 60% of its volume. The cycle performance and coulombic efficiency of the multi-layered Sn electrode were higher than those of the smooth Sn electrode, due primarily to the buffering effects of the open spaces between the layers against the volume expansion of the Sn anode during cycling. ii) Synthesis of Sn anode by electrodepositing Sn on a porous Cu foam substrate, The effects of Cu substrate morphology and post electrodeposition on the porosity, adhesion as well as the mechanical strength of Cu foam electrodeposits are examined. The porosity of Cu foam is enhanced by changing the morphology of the Cu substrate from smooth to nodular because $H_2$ bubbles are split into small bubbles by the nodules. In addition, the adhesive properties of Cu foam deposited on the nodular Cu foil are improved by the mechanical interlocking effects of the nodules. As a result of post electrodeposition treatment, the mechanical strength of the Cu foam is significa...
Advisors
Kwon, Hyuk-Sangresearcher권혁상researcher
Description
한국과학기술원 : 신소재공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
455402/325007  / 020065810
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2010.08, [ xiii, 143 p. ]

Keywords

micro-structural change; electrochemical properties; Sn-based anode; lithium-ion battery; morphology; 표면형상; 미세구조 변화; 전기화학 특성; 주석계음극; 리튬이차전지

URI
http://hdl.handle.net/10203/49879
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=455402&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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