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Selectively accelerated lithium ion transport to silicon anodes via an organogel binder.

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Title: Selectively accelerated lithium ion transport to silicon anodes via an organogel binder.
Authors: Hwang, Chihyun1, Cho, Yoon-Gyo1, Kang, Na-Ri2,3, Ko, Younghoon1, Lee, Ungju4, Ahn, Dongjoon4, Kim, Ju-Young2,3,5, Kim, Young-Jin6, Song, Hyun-Kon1 philiphobi@hotmail.com
Source: Journal of Power Sources. Dec2015, Vol. 298, p8-13. 6p.
Subjects: Lithium-ion batteries, Silicon, Anodes, Binding agents, Electric conductivity, Cyanoethylation
Abstract: Silicon, a promising high-capacity anode material of lithium ion batteries, suffers from its volume expansion leading to pulverization and low conductivities, showing capacity decay during cycling and low capacities at fast charging and discharging. In addition to popular active-material-modifying strategies, building lithium-ion-rich environments around silicon surface is helpful in enhancing unsatisfactory performances of silicon anodes. In this work, we accelerated lithium ion transport to silicon surface by using an organogel binder to utilize the electroactivity of silicon in a more efficient way. The cyanoethyl polymer (PVA-CN), characterized by high lithium ion transference number as well as appropriate elastic modulus with strong adhesion, enhanced cycle stability of silicon anodes with high coulombic efficiency even at high temperature (60 °C) as well as at fast charging/discharging rates. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Silicon, a promising high-capacity anode material of lithium ion batteries, suffers from its volume expansion leading to pulverization and low conductivities, showing capacity decay during cycling and low capacities at fast charging and discharging. In addition to popular active-material-modifying strategies, building lithium-ion-rich environments around silicon surface is helpful in enhancing unsatisfactory performances of silicon anodes. In this work, we accelerated lithium ion transport to silicon surface by using an organogel binder to utilize the electroactivity of silicon in a more efficient way. The cyanoethyl polymer (PVA-CN), characterized by high lithium ion transference number as well as appropriate elastic modulus with strong adhesion, enhanced cycle stability of silicon anodes with high coulombic efficiency even at high temperature (60 °C) as well as at fast charging/discharging rates. [ABSTRACT FROM AUTHOR]
ISSN:03787753
DOI:10.1016/j.jpowsour.2015.08.017