A Tri-Salt Composite Electrolyte with Temperature Switch Function for Intelligently Temperature-Controlled Lithium Batteries

IF 13 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Ende Fu, Huimin Wang, Yating Zhang, Zhenxue Xiao, Xiu Zheng, Shuai Hao, Xueping Gao
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Abstract

The intense research of lithium-ion batteries has been motivated by their successful applications in mobile devices and electronic vehicles. The emerging of intelligent control in kinds of devices brings new requirements for battery systems. The high-energy lithium batteries are expected to respond or react under different environmental conditions. In this work, a tri-salt composite electrolyte is designed with a temperature switch function for intelligently temperature-controlled lithium batteries. Specifically, the halide Li3YBr6 together with LiTFSI and LiNO3 works as active fillers in a low-melting-point polymer matrix (polyethyleneglycol dimethyl ether (PEGDME) and polyethylene oxide (PEO)), which is further filled into the pre-lithiated alumina fiber skeleton. Above 60 °C, the composite electrolyte exists in the liquid state and fully contacts with the working electrodes on the liquid–solid interface, effectively minimizing the interfacial resistance and leading to high discharge capacity in the cell. The electrolyte is changed into a solid state below 30 °C so that the ionic conductivity is significantly reduced and the interface resistance is increased dramatically on the solid–solid interface. Therefore, by simply adjusting the temperature, the cell can be turned “ON” or “OFF” intentionally. This novel function of the composite electrolyte has enlightening significance in developing intelligently temperature-controlled lithium batteries.

Abstract Image

Abstract Image

用于智能温控锂电池的具有温度开关功能的三盐复合电解质
锂离子电池在移动设备和电子汽车中的成功应用推动了对锂离子电池的深入研究。各种设备中出现的智能控制对电池系统提出了新的要求。高能锂电池需要在不同的环境条件下做出反应。本研究设计了一种具有温度开关功能的三盐复合电解质,用于智能温控锂电池。具体来说,卤化物 Li3YBr6 与 LiTFSI 和 LiNO3 一起作为活性填料加入低熔点聚合物基质(聚乙二醇二甲醚 (PEGDME) 和聚氧化乙烯 (PEO)),并进一步填充到预石灰化的氧化铝纤维骨架中。温度高于 60 °C 时,复合电解质呈液态,并在液固界面上与工作电极充分接触,从而有效地将界面电阻降至最低,使电池具有较高的放电容量。电解质在低于 30 °C 时会转变为固态,因此离子导电率会显著降低,固-固界面上的界面电阻也会急剧增加。因此,只需调节温度,就能有意识地 "开启 "或 "关闭 "电池。复合电解质的这种新功能对开发智能温控锂电池具有启迪意义。
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来源期刊
Energy & Environmental Materials
Energy & Environmental Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
17.60
自引率
6.00%
发文量
66
期刊介绍: Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.
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