Crosslinked Gel Polymer Electrolytes for Si Anodes in Li-Ion Batteries
Crosslinked Gel Polymer Electrolytes for Si Anodes in Li-Ion Batteries
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DOI：
10.1149/2.0311913jes
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发表时间：
2019-08-16
影响因子：
3.9
通讯作者：
Lee, Youngkwan
中科院分区：
文献类型：
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作者：
Lee, Jeong Hun;Kim, Soochan;Lee, Youngkwan
将聚乙二醇二缩水甘油醚(PEGDE)与二氨基聚环氧丙烷(DPPO)反应，在1M LiPF6溶液中浸泡，制得凝胶聚合物电解质(GPE)膜。为了将GPE应用于锂离子电池的硅负极，通过控制各部分的相对分子质量，对其物理性能进行了优化。由PEGDE(1000gmol-1)和DPPO(4000gmol-1)组成的交联GPE膜在25℃下具有良好的尺寸稳定性、低电阻和足够的离子电导率1.0ms cm(-1)。使用该GPE的硅负极电池的电池性能提高到2434mAhg(-1)，100次循环后循环保持率达到80%。优化后的CGPE具有良好的物理性能，可以解决由于Si的体积膨胀和Li枝晶的形成而产生的安全性和稳定性问题。(三)2019年电化学会。
Gel polymer electrolyte (GPE) membrane was prepared by the facile amine-epoxy crosslinking reaction of poly(ethylene glycol) diglycidylether (PEGDE) with diamino-poly(propylene oxide) (DPPO) and subsequent immersion in 1 M LiPF6 solution. To apply GPE for Si anode in a Li-ion battery, the physical properties were optimized by the degree of crosslinking which was controlled by molecular weight of each part. The crosslinked GPE membrane composed of PEGDE(1,000 g mol(-1)) and DPPO (4,000 g mol(-1)) exhibited desirable dimensional stability, low electrical resistance, adequate ionic conductivity of 1.0 mS cm(-1) at 25 degrees C. The Si anode cell employing this GPE exhibited enhanced battery performance of 2,434 mAhg(-1) and 80% cyclic retention after 100 cycles. The well-optimized cGPE with desirable physical properties could resolve the issues of safety and stability resulted from volume expansion of Si as well as Li dendrite formation. (C) 2019 The Electrochemical Society.