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Lithium batteries have been widely used in portable electronic devices such as laptops, mobile phones, digital cameras, and other products. The battery separator is a key material that ensures battery safety and affects battery performance, serving to prevent contact between positive and negative electrodes, prevent battery short circuits, and transport ions; The thermal stability of the separator determines the temperature range that the battery can withstand and the safety of the battery. At present, the commercialized lithium battery separator is mainly composed of polyolefin organic separators, which have the advantages of low cost, good mechanical properties, and good electrochemical stability; The disadvantage is that the porosity is low, the wettability of the electrolyte is poor, and the thermal stability is poor, which may lead to battery short circuits. In severe cases, it can cause accidents such as fire or explosion, posing a safety hazard.

Recently, a team led by Zhu Yingjie, a researcher at the Shanghai Institute of Silicates, Chinese Academy of Sciences, and a team led by Hu Xianluo, a professor at Huazhong University of Science and Technology, collaborated to develop a new type of hydroxyapatite ultra-long nanowire based high-temperature resistant lithium battery separator based on the research work of hydroxyapatite ultra-long nanowire new inorganic refractory paper. The battery separator has many advantages, such as high flexibility, good mechanical strength, high porosity The electrolyte has excellent wetting and adsorption properties, high thermal stability, high temperature resistance, flame retardancy and fire resistance, and can still maintain its structural integrity at a high temperature of 700 ℃. The battery assembled with a new type of hydroxyapatite ultra long nanowire based high-temperature resistant battery separator has better electrochemical performance, cycle stability, and rate performance than the battery assembled with a polypropylene separator. More importantly, batteries assembled using hydroxyapatite ultra-long nanowire based high-temperature resistant battery separators have excellent thermal stability, can withstand high temperatures, can maintain normal working conditions in a high temperature environment of 150 ℃, and can light small bulbs; Batteries assembled with polypropylene membranes quickly experience short circuits at high temperatures of 150 ℃. If the new type of hydroxyapatite ultra-long nanowire based high-temperature battery separator is used, coupled with high-temperature resistant electrolyte and electrode materials, the working temperature and safety of the battery can be further greatly improved. This research work is of great significance in significantly improving the operating temperature range and safety of lithium batteries. It is expected that the new type of hydroxyapatite ultra-long nanowire based high-temperature battery separator can also be applied to various other types of high-temperature batteries and energy storage systems, such as sodium ion batteries, supercapacitors, etc. The relevant research results were published in Advanced Materials and an invention patent was applied for.

The research work has received funding from the National Natural Science Foundation of China, the Shanghai Municipal Science and Technology Commission, and the Shanghai Institute of Silicate Research, Chinese Academy of Sciences, including key innovation projects.

The new type of hydroxyapatite ultra-long nanowire based high-temperature battery separator has good flexibility and mechanical strength

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