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Journal of The Electrochemical Society | 2008

Electrochemical Behaviors of Silicon Electrode in Lithium Salt Solution Containing Alkoxy Silane Additives

Young-gyoon Ryu; Seok-Soo Lee; Sang-kook Mah; Dong Joon Lee; Kyungjung Kwon; Seung-Sik Hwang; Seok-Gwang Doo

The electrochemical behaviors of a silicon thin-film electrode in organic lithium salt solution were explored with focus on irreversible reactions of the first lithium charge and discharge cycling by using electrochemical quartz crystal microbalance (EQCM) combined with various electrochemical techniques. A considerable increase in mass of the silicon electrode was observed during lithium charging even before lithium absorption into the electrode, which is ascribed to the buildup of electrolyte reduction products on the silicon surface. Galvanostatic charge-discharge experiments combined with ac impedance spectroscopy demonstrate a significant overpotential growth and an aggravating capacity for the lithium charge and discharge cycling, and suggest they are due to the sedimentation of electrolyte reduction product. Additives containing alkoxy silane functional groups were evaluated as a passivation agent for lithium rechargeable batteries utilizing a silicon anode. The presence of additives in electrolyte suppressed the mass accumulation to the silicon electrode caused by irreversible electrolyte reductions and improved the electrode for cycle life. Electrochemical analyses associated with EQCM as a function of the number of alkoxy functional groups of the additives illustrate that the silicon electrode is passivated by chemical reaction of the alkoxy silane functional group of the additives with hydroxyl groups at the electrode/electrolyte interface, and this passivation improves the cycle life.


Archive | 2004

Composition for protecting negative electrode for lithium metal battery, and lithium metal battery fabricated using same

Duck-chul Hwang; Seung-Sik Hwang; Chung-kun Cho; Sang-mock Lee


Archive | 2004

Method of preparing a lithium metal anode

Chung-kun Cho; Duck-chul Hwang; Sang-mock Lee; Seung-Sik Hwang


Archive | 2008

COMPOSITE ANODE ACTIVE MATERIAL, ANODE INCLUDING THE SAME AND LITHIUM BATTERY USING THE ANODE

Seung-Sik Hwang; Hansu Kim


Archive | 2015

Flexible secondary battery

Moon-Seok Kwon; Jae-Man Choi; Seok-Gwang Doo; Jeong-kuk Shon; Min-Sang Song; Seung-Sik Hwang


Archive | 2004

Negative electrode for rechargeable lithium battery, method of producing same and rechargeable lithium battery comprising same

Chung-kun Cho; Duck-chul Hwang; Seung-Sik Hwang; Sang-mock Lee


Archive | 2006

Electrode, method of preparing the same, binder composition, lithium battery containing the electrode and the binder composition

Seung-Sik Hwang; Jin-Hwan Park; Myung-Dong Cho


Archive | 2013

FLEXIBLE BATTERY AND FLEXIBLE ELECTRONIC DEVICE INCLUDING THE SAME

Moon-Seok Kwon; Hansu Kim; Young-Min Choi; Jae-Man Choi; Seung-Sik Hwang; Min-Sang Song; Jeong-kuk Shon


Archive | 2006

Polyurethane binder, electrodes containing the same and lithium battery employing the electrodes

Seung-Sik Hwang; Jin-Hwan Park


Archive | 2004

Rechargeable lithium battery with specific surface roughness of positive electrode and/or negative electrode

Duck-chul Hwang; Seung-Sik Hwang; Sang-mock Lee; Chung-kun Cho; Yun-Suk Choi

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