Research on Thermal Stability of Organic Electrolytes for Nickel Hydride No. 5 batteries

　　Study on the thermal stability of organic electrolytes for Nickel Hydride No. 5 batteries. The reaction of the organic electrolyte has the most important impact on the safety of Nickel Hydride No. 5 batteries. The electrolyte used in Nickel Hydride No. 5 batteries is an ionic conductor with electrolyte lithium salt dissolved in an organic solvent. Lithium-ion battery electrolytes are very sensitive to the energy density, cycle life, safety and other properties of electrodes and batteries.

　　Research on Thermal Stability of Organic Electrolytes for Nickel Hydride No. 5 batteries

　　We know that conventional Nickel Hydride No. 5 batteries use non-aqueous organic solvents. When the battery generates heat due to an internal short circuit, the electrolyte is heated and decomposes to produce gas, which may cause the battery to expand or cause the battery to explode.

　　The electrolyte of Nickel Hydride No. 5 batteries is prone to decomposition reactions during the charge and discharge process, accompanied by the release of heat, which brings safety risks to the long-term use of Nickel Hydride No. 5 batteries and also brings difficulties to the commercialization of large-volume Nickel Hydride No. 5 batteries. Therefore, the thermal stability of organic electrolytes is an important factor that must be considered in the development and research of Nickel Hydride No. 5 batteries.

　　Research on the thermal stability of organic electrolytes mainly includes two aspects: the thermal stability of the organic electrolyte itself and the thermal stability of the interaction between the electrolyte and electrode materials. The former is determined by its own properties, while the latter is also related to the properties of the electrode and is relatively more complicated.

　　Under sealed conditions, high-purity LiPF6 shows a thermal peak at 194°C, and continues to increase the temperature to 250°C where it begins to decompose. The first differential thermal peak is caused by the crystalline transformation of LiPF6. When LiPF6 is heated under flowing high-purity argon gas and a humidity of 1 mg/kg, it loses 20% to 30% of its mass in 10 hours at 85°C.

　　If it is under low-purity argon conditions, it will start to decompose at 20~C, and the products are mainly PFs and LiF. Obviously, compared with other lithium salts, LiPF6 has the worst thermal stability and the most demanding storage conditions. In addition, LiPFs is also very hygrophilic and can decompose into HF and other substances when encountering trace amounts of moisture. These decomposition products (especially PFs) can easily react with carbonate solvents and destroy the electrolyte, which is the main reason why the electrolyte composed of LiPF6 and mixed carbonates is unstable.

　　The current research status of organic electrolyte materials for Nickel Hydride No. 5 batteries. The organic electrolyte for Nickel Hydride No. 5 batteries mainly consists of three parts: electrolyte lithium salt, organic solvent and additives. The research and development of new electrolyte lithium salts can be divided into three aspects:

　　(1)LiTFSI and its analogs;

　　(2) Complex lithium borate compound;

　　(3) Complex lithium phosphate compound

　　Research work on organic solvents mainly focuses on the development of new organic solvents. The most important additives mainly fall into three categories: (1) additives mainly used to improve the performance of the SEI film of carbon anodes; (2) overcharge protection additives; (3) formulations. body additives.

　　Experts believe that all-solid-state Nickel Hydride No. 5 batteries use solid electrolytes to replace traditional organic liquid electrolytes, which are expected to fundamentally solve battery safety issues and are ideal chemical power sources for electric vehicles and large-scale energy storage.

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