The savior of lithium batteries-solid polymer electrolyte

by:CTECHi     2021-07-10

Energy storage equipment is a key technology for modern human progress. As lithium electronic secondary batteries have many advantages such as high working voltage, long cycle life, and low environmental pollution, they have become extremely popular green chemical energy sources. The new generation of high specific energy lithium batteries is the development direction of energy storage devices in the future. However, due to the use of organic electrolytes, high energy density lithium batteries have a series of safety hazards such as easy leakage, fire, and explosion. Improving battery safety has become the current trend. The focus of the research. Recently, the School of Materials Science and Engineering of Tsinghua University has developed a new type of solid polymer electrolyte to replace the traditional organic electrolyte, successfully solving this problem. This electrolyte has high ionic conductivity, low electrode/electrolyte interface impedance, and good mechanical strength, which is of great significance for improving battery safety. The researchers first constructed a low-impedance graphite electrode/gel polymer electrolyte interface by improving the chemical process. On this basis, the nitriles are polymerized in situ in the succinonitrile all-solid electrolyte (SEN), which makes the electrode and SEN maintain good adhesion, significantly reduces the interface impedance and makes the polymer battery exhibit good electrical Chemical properties. Secondly, the dipropylene glycol dipropylene monomer is dissolved in a carbonate-based electrolyte to prepare a precursor solution to prepare a nanosphere-based composite solid electrolyte (SiSE). Due to the stable and low-impedance electrode/solid electrolyte interface and SiSE have a significant inhibitory effect on the production of lithium branches, solid-state lithium metal batteries using SiSE exhibit superior cycle performance and safety. SISE preparation process Once again, the researchers inhaled the ether electrolyte containing fluoroethylene carbonate into the nanosphere layer to prepare a quasi-solid electrolyte. This rich mesoporous structure can adsorb polysulfides to limit the shuttle effect, significantly improve the cycle performance of the lithiated silicon-sulfur full battery, and keep the structure intact under short-circuit conditions. Finally, a high-safety hierarchical structure polyionic liquid-based solid electrolyte was designed by in-situ method. The electrolyte also has high ionic conductivity, low electrode/electrolyte interface impedance and good mechanical strength, and exhibits superior electrochemical performance in both lithium ion and sodium ion batteries. The research results not only successfully prepared quasi-solid polymer electrolytes, but also extended the application of polyionic liquid materials from lithium-ion batteries to sodium-ion batteries for the first time, providing a good idea for the development of new energy storage devices.

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