Ionic liquid doped PEO-based solid polymer electrolytes for lithium-ion polymer batteries
Ionic liquid doped PEO-based solid polymer electrolytes for lithium-ion polymer batteries
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DOI：
10.1016/j.ijhydene.2016.04.160
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发表时间：
2017-03-09
影响因子：
7.2
通讯作者：
Rhee, Hee-Woo
中科院分区：
文献类型：
--
作者：
Polu, Anji Reddy;Rhee, Hee-Woo
研究了室温离子液体1-乙基-3-甲基咪唑双（三氟甲基磺酰基）酰亚胺（EMImTFSI）对聚环氧乙烷（PEO）二氟硼酸锂（LiDFOB）固体聚合物电解质的影响及其在固态Li/LiFePO 4电池中的应用。不同的结构，热，电和电化学研究显示出这些聚合物电解质膜，适合作为可充电锂离子电池的电解质的有前途的特性。通过X射线衍射（XRD）和差示扫描量热法（DSC）研究，由于引入离子液体，结晶度显着下降。红外光谱研究表明，LiDFOB和离子液体中的阳离子与PEO链上的醚氧原子发生了相互作用。具有类似于40wt%的离子液体的聚合物电解质在30 ℃下提供类似于1.85 × 10（-4）S/cm的最大离子电导率，具有改进的电化学稳定性。Li/PEO-LiDFOB-40wt%EMImTFSI/LiFePO 4钮扣型电池在0.1C下循环显示出约155 mAh g（-1）的第一次放电容量，并且在第50次循环时保持为134.2mAh g（-1）。将离子液体添加到PEO 20-LiDFOB聚合物电解质中导致锂聚合物电池的性能非常有希望的改善。(C)2016年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
The influence of adding the room-temperature ionic liquid 1-ethyl-3-methyllimidazolium bis(trifluoromethylsulfonyl)imide (EMImTFSI) to poly(ethylene oxide) (PEO) lithium difluoro(oxalato)borate (LiDFOB) solid polymer electrolyte and the use of these electrolytes in solid-state Li/LiFePO4 batteries has been investigated. Different structural, thermal, electrical and electrochemical studies exhibit promising characteristics of these polymer electrolyte membranes, suitable as electrolytes in rechargeable lithium-ion batteries. The crystallinity decreased significantly due to the incorporation of ionic liquid, investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The ion polymer interaction, particularly the interaction of cations in LiDFOB and ionic liquid with ether oxygen atom of PEO chains, has been evidenced by FT-IR studies. The polymer electrolyte with similar to 40 wt% of ionic liquid offers a maximum ionic conductivity of similar to 1.85 x 10(-4) S/cm at 30 degrees C with improved electrochemical stabilities. The Li/PEO-LiDFOB-40 wt% EMImTFSI/LiFePO4 coin-typed cell cycled at 0.1 C shows the 1st discharge capacity about 155 mAh g(-1) and remains 134.2 mAh g(-1) on the 50th cycle. The addition of the ionic liquid to PEO20-LiDFOB polymer electrolyte has resulted in a very promising improvement in performance of the lithium polymer batteries. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.