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Preparation of gel polymer electrolyte with high lithium ion transference number using GO as filler and application in lithium battery
Ionics ( IF 2.8 ) Pub Date : 2020-06-05 , DOI: 10.1007/s11581-020-03628-z
Xiaoming Zhao , Cheng-an Tao , Yujiao Li , Xianzhe Chen , Jianfang Wang , Hang Gong

High lithium ion transference number (tLi+) is one of the requirements of polymer electrolytes for utilization in lithium secondary batteries. Herein, graphene oxide (GO) is used as a filler to fabricate the homogeneous gel polymer electrolyte (GPE) for pursuing high tLi+. The effect of GO on the whole properties of gel polymer electrolytes including conductivity, lithium ion transference number, electrochemical window, electrochemical stability, and cycling performance are explored. Impressively, the GPE containing 0.3 wt% of GO (labeled as GPE-0.3%) demonstrates a high lithium ion transference number of 0.79 and improved electrochemical stability. The LFP/Li battery with GPE-0.3% as the separator shows excellent electrochemical cycle stability and Coulomb efficiency at 25 °C. The discharge specific capacity retention rate of this battery is 94.4% after 100 cycles at 0.2C. All these features make the gel polymer electrolyte useful as a separator of lithium metal batteries for high-performance lithium ion conductors, which exhibits high safety.

中文翻译:

以GO为填充剂制备高锂离子转移数的凝胶聚合物电解质及其在锂电池中的应用

高锂离子转移数(t Li +)是用于锂二次电池的聚合物电解质的要求之一。这里,氧化石墨烯(GO)用作填充剂以制造用于追求高t Li的均相凝胶聚合物电解质(GPE)。+。探讨了GO对凝胶聚合物电解质整体性能的影响,包括电导率,锂离子转移数,电化学窗口,电化学稳定性和循环性能。令人印象深刻的是,含有0.3 wt%的GO的GPE(标记为GPE-0.3%)显示出0.79的高锂离子转移数和改善的电化学稳定性。具有GPE-0.3%的隔膜的LFP / Li电池在25°C时具有出色的电化学循环稳定性和库仑效率。在0.2C下100次循环后,该电池的放电比容量保持率为94.4%。所有这些特征使得凝胶聚合物电解质可用作表现出高安全性的用于高性能锂离子导体的锂金属电池的隔膜。
更新日期:2020-06-05
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