个人信息Personal Information
副教授
硕士生导师
性别:男
毕业院校:哈尔滨工业大学
学位:博士
所在单位:化工海洋与生命学院
学科:化学工程. 能源化工. 功能材料化学与化工
办公地点:D01-312A
联系方式:0427-2631809
电子邮箱:liuanmin@dlut.edu.cn
Semi closed coordination structure polymer electrolyte combined in situ interface engineering for lithium batteries
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论文类型:期刊论文
发表时间:2020-08-15
发表刊物:CHEMICAL ENGINEERING JOURNAL
收录刊物:SCIE
卷号:394
ISSN号:1385-8947
关键字:Solid polymer electrolyte; Semi closed coordination; Theoretical calculation; In-situ polymerization; Lithium battery
摘要:Low ionic conductivity and lithium ion transference number (t(Li+)) of solid polymer electrolytes (SPEs) preclude their practical implementation. Adjusting the coordination mode of the lithium ions and the polymer functional groups for improving the performance of SPEs is a great challenge. Herein, a combination of the density functional theory calculations and the molecular dynamics simulations is used to study the coordination structure of the lithium ion and its diffusion property in SPEs, demonstrating that a semi closed O-Li+ coordination mode in the poly ether/carbonate electrolyte with shorter ether chains leads to free lithium migration. Based on the theoretical calculations, the synthesized SPE realizes an excellent conductivity of 2.97 x 10(-4) S cm(-1) at 30 degrees C and a high t(Li+) of 0.78, accompanying with good electrochemical stability. In-situ polymerization is introduced to fabricate the solid-state battery, ameliorating the interface of the electrode and SPE. A solid-state LiFePO4/Li battery demonstrates superior rate capacity and cycling durability (95% capacity retention over 100 cycles) at elevated temperature. In addition, the performance of the battery with high voltage cathode is also evaluated at ambient temperature, maintaining respectable rate capability and cycling ability. The semi closed SPE with loose coordination is a competitive stratagem for improving the performance of solid-state batteries in the future.
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