Ambient temperature solid-state Li-battery based on high-salt-concentrated solid polymeric electrolyte
Ambient temperature solid-state Li-battery based on high-salt-concentrated solid polymeric electrolyte
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DOI：
10.1016/j.jpowsour.2018.05.050
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发表时间：
2018-09
影响因子：
9.2
通讯作者：
Yang Li;F. Ding;Zhibin Xu;Lingzi Sang;Libin Ren;Wang Ni;Xingjiang Liu
中科院分区：
文献类型：
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作者：
Yang Li;F. Ding;Zhibin Xu;Lingzi Sang;Libin Ren;Wang Ni;Xingjiang Liu
陶瓷/PEO复合固体电解质固体电池的室温应用受到PEO基聚合物离子导电性差的制约。本文研究了由聚碳酸亚丙酯（PPC）和双氟磺酰亚胺锂（LiFSI）组成的高盐浓度聚合物电解质及其在陶瓷/聚合物复合固体电解质中的应用。PPC-LiFSI 80重量%电解质显示出在环境温度下约10−4S cm− 1的显著改善的离子电导率，Li迁移数为0.75，阳极稳定性高达4.5 V（相对于Li/Li+）。具有Li1.5Al0.5Ge1.5（PO 4）3（LAGP）/PPC-LiFSI 80 wt.%的LiFePO 4/Li电池复合电解质表现出稳定的充放电曲线和优异的循环性能，其在0.1C下的放电比容量为138.3 mAh g− 1，100次循环后的容量保持率为97.1%。根据EIS结果，我们发现减少电池劣化和极化归因于电极和固体电解质之间的改善的界面，这是通过引入柔性和导电的高盐浓度聚合物电解质PPC-LiFSI 80 wt.%来实现的。结果表明，陶瓷/高盐浓度PPC基聚合物复合电解质在室温固态锂电池中具有良好的应用前景。
The ambient temperature application of solid-state batteries (SSBs) based on ceramic/PEO composite solid electrolyte has been restrained by the poor ionic conductivity of PEO-based polymer. Herein, we have studied high-salt-concentrated polymeric electrolyte comprising poly(propylene carbonate) (PPC) and lithium bis-(fluorosulfonyl) imide (LiFSI), as well as its application in ceramic/polymer composite solid electrolytes based SSBs. The PPC-LiFSI 80 wt.% electrolyte showed a significantly improved ionic conductivity on the order of 10−4S cm−1at ambient temperature, Li transference number of 0.75, and anodic stability up to 4.5 V versus Li/Li+. The LiFePO4/Li cell with Li1.5Al0.5Ge1.5(PO4)3(LAGP)/PPC-LiFSI 80 wt.% composite electrolyte showed stable charge/discharge profiles and excellent cycling performance, which delivered a specific discharge capacity of 138.3 mAh g−1at 0.1C and a high capacity retention of 97.1% after 100 cycles. According to EIS results, we found that the reduced cell deterioration and polarization is attributed to the improved interface between the electrode and the solid electrolyte, which is realized by introducing the flexible and conductive high-salt-concentrated polymeric electrolyte PPC-LiFSI 80 wt.%. The results indicate that ceramic/high-salt-concentrated PPC-based polymer composite electrolyte is promising for ambient temperature solid-state lithium batteries.