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采用锂对称电池体系,结合恒电位极化法和电化学阻抗测量LiPF6基电解液锂离子迁移数。研究溶剂比例和锂盐浓度变化对离子迁移数的影响。结果表明:随着溶剂中环状碳酸酯的增加,电解液中锂离子迁移数降低;锂盐浓度在0.3mol·L-1-1.5mol·L-1范围内锂离子迁移数随锂盐浓度的增加而增大。同时评估了常规型和功率型两款电解液的离子迁移数,功率型电解液的离子迁移数高于常规型电解液,高的离子迁移数有利于减弱充放电过程中的浓差极化,提高电池的功率性能。
Abstract：The Li+transference number in LiPF6-based electrolytes was investigated by potentiostatic polarization method as well as electrochemical impedance spectroscopy using lithium symmetric cells.The effect of solvent ratio and lithium salt concentration on Li+transference number was studied.As a result,the Li+transference number decreases with the increase of ring carbonate in solvent.And the electrolytes with higher lithium salt concentration lead to a greater Li+transference number in the concentration range of 0.3 mol·L-1-1.5 mol·L-1.Meanwhile the evaluation of Li+transference number was done between the conventional and power electrolytes.The Li+transference number of the power electrolytes is higher than that of the conventional electrolytes.A high transference number can significantly reduce the concentration polarization and improve battery power performance.
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基本信息:
中图分类号:TM912
引用信息:
[1]王蓉蓉,朱振东,彭文.恒电位极化法测量LiPF_6基电解液离子迁移数[J].电池工业,2020,24(06):283-287.
基金信息:
国家重点研发计划项目（2016YFB0100304）
2020-12-25
2020-12-25