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    Home > Xi'an Jiaotong University researchers have made important progress in the field of flexible battery research

    Xi'an Jiaotong University researchers have made important progress in the field of flexible battery research

    • Last Update: 2019-11-07
    • Source: Internet
    • Author: User
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    With the increasing demand for portable wearable electronic devices (such as folding mobile phones, wearable detectors, smart bracelets, etc.), the research and development of energy storage devices with high energy density and flexibility has attracted much attention Lithium sulfur battery is considered as one of the most promising energy storage devices in the "post lithium battery era" because it has much higher theoretical energy density than the current commercial lithium-ion battery However, there are still many problems in lithium sulfur battery, such as the shuttle of soluble polysulfide between the positive and negative electrodes, the low load of active material sulfur, and the poor mechanical strength of the electrode, which have seriously hindered the practical application process Especially in the flexible application, the stack design between the conventional diaphragm, electrode and collecting fluid will inevitably cause the gap and dislocation of each component in the repeated bending, cause the uneven deposition of insulating lithium sulfide and interface problems, cause the capacity degradation of the battery and generate security risks In view of the above problems, Professor Yanwei's research group and Professor Ding Shujiang's research group of Xi'an Jiaotong University cooperated with Dr Xi Kai of Cambridge University to build a flexible fiber membrane with positive electrode, fluid and diaphragm, and successfully applied it to lithium sulfur battery The integrated fiber membrane shows excellent flexibility and maintains good mechanical properties after repeated bending process Thanks to the cooperation among different levels, the integrated system also achieves polysulfide anchoring, electron / ion efficient conduction and high sulfur surface load In practical application, the lithium sulfur flexible soft pack battery can stably light up the lamp belt composed of 30 LEDs under the condition of 180 degree repeated bending, which has a wide application prospect The idea of building integrated flexible battery in this study can provide reference for the development of portable flexible energy storage system This research work was published on advanced energy materials (DOI:) under the title of "flexible and high loading lithium sulfur batteries enabled by integrated three in one membrane" and was rated as "inside front" of the current period Cover), Dr Wang Jianan of Xi'an Jiaotong University is the first author of this paper, and Xi'an Jiaotong University is the first signatory The research is supported by NSFC, China Postdoctoral fund, Shaanxi Natural Science Fund and other projects.
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