Mechanism of Interactions between CMC Binder and Si Single Crystal Facets
Mechanism of Interactions between CMC Binder and Si Single Crystal Facets
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DOI：
10.1021/la501791q
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发表时间：
2014-09-02
期刊：
影响因子：
3.9
通讯作者：
Lux, S. F.
中科院分区：
文献类型：
--
作者：
Vogl, U. S.;Das, P. K.;Lux, S. F.
活性材料颗粒与粘合剂的相互作用对于定制锂离子电池中使用的复合电极的性能至关重要。采用傅里叶变换红外光谱（FTIR）研究了羧甲基纤维素（CMC）结构中羧基质子化程度与制备溶液pH值的关系。选择了CMC粘合剂的三种不同的独特化学状态（质子化、去质子化和半半），并研究了它们与不同硅单晶面的相互作用。不同的Si表面取向显示出与CMC粘合剂的相互作用强度的明显差异。CMC/Si溶液中的粘附力和硅的润湿性也强烈依赖于CMC的质子化程度。这项工作提供了对这些相互作用的性质的深入了解，这些相互作用决定了硅复合电极的电化学性能。
Interactions of the active material particles with the binder are crucial in tailoring the properties of composite electrodes used in lithium-ion batteries. The dependency of the protonation degree of the carboxyl group in the carboxymethyl cellulose (CMC) structure on the pH value of the preparation solution was investigated by Fourier transform infrared spectroscopy (FTIR). Three different distinctive chemical states of CMC binder were chosen (protonated, deprotonated, and half-half), and their interactions with different silicon single crystal facets were investigated. The different Si surface orientations display distinct differences of strength of interactions with the CMC binder. The CMC/Si adhesion forces in solution and Si wettability of the silicon are also strongly dependent on the protonation degree of the CMC. This work provides an insight into the nature of these interactions, which determine the electrochemical performance of silicon composite electrodes.