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Research and development background of new single-ion polymer electrolyte materials

by:dcfpower     2021-03-24
u003cpu003eu003cpu003e Lithium-ion batteries have the advantages of high mass density, large volume density, long cycle life, and strong reliability, which are widely used in various electronic products and power trains. Electrolyte is an important part of lithium-ion batteries, and a good-performance electrolyte can greatly improve the energy efficiency of lithium-ion batteries. u003c/pu003eu003cpu003eu003c/pu003eu003cpu003e Lithium ion migration number is an important property of lithium ion secondary battery electrolyte. The higher the lithium ion migration number, the higher the energy efficiency of the lithium ion battery. The lithium ion migration number When it approaches or reaches 1, the energy efficiency of the battery will reach the highest. This is because in the lithium ion secondary battery, on the one hand, the migration of anions will lead to the consumption of electricity; on the other hand, because the migration speed of anions is faster than that of lithium ions, the electrolyte salt will produce a concentration gradient during the charging and discharging process. , Resulting in concentration polarization, thereby reducing the energy efficiency of lithium-ion batteries. For traditional liquid organic small molecule electrolytes, increasing the radius of the anion and dispersing the distribution of negative charges in the anion are important ways to increase the migration number of lithium ions. In this regard, LiBOB electrolyte based on SP3 boron with charge dispersion and N(SO2CF3)2 electrolyte based on trifluoromethanesulfonimide have been extensively studied, and have been used in lithium ion secondary battery electrolytes. However, the lithium ion migration number of the above two electrolytes is much lower than 1. To increase the migration number of lithium ions to close to 1, another way is to greatly increase the size of the anion, so that the anion can be completely fixed. Based on this idea, in recent years, a new type of polymer electrolyte material, single-ion polymer electrolyte, has emerged. Single-ion polymer electrolyte is a new type of polymer electrolyte that has a higher lithium ion migration number and the advantages of traditional polymer electrolytes. Based on the above research ideas, researchers need to prepare a single-ion polymer electrolyte containing the above two large anionic functional groups. u003c/pu003eu003cpu003eu003c/pu003eu003c/pu003eu003c/pu003e
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