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Research progress on all solid polymer electrolytes for lithium batteries
At present, large-scale commercial lithium secondary batteries generally use liquid electrolytes of organic carbonates, and safety problems such as easy leakage, flammability, and explosiveness limit the further application of such electrolytes.
All-solid-state polymer electrolytes (ASPEs) have the advantages of good safety performance, high energy density, wide operating temperature range and long cycle life. They are one of the research hotspots in the field of lithium-ion batteries. ASPEs usually have excellent mechanical properties, which can inhibit the dendrite growth of lithium metal electrodes during charge and discharge, so it has a very important application prospect in the field of lithium metal batteries.
Several ASPEs systems have been studied, including polyoxyethylene (PEO) based systems, polycarbonate based systems, polysiloxane based systems, and polymer lithium single ion conductor systems.
PEO-based ASPEs are the earliest and most studied types of ASPEs, but their high crystallinity causes difficulties in room temperature Li+ migration and low ionic conductivity. Therefore, researchers have developed a series of reductions in PEO crystallinity and improved system ionic conductivity. Modified means.
The polycarbonate-based ASPEs main chain structure contains strong polar carbonate groups and has a constant room temperature, which makes the lithium salt easier to dissociate, and the room temperature ionic conductivity is generally higher than that of the PEO group. It is a potential PEO group. ASPEs alternative materials.
In addition to carbon chain polymers, polysiloxane-based ASPEs systems with lower glass transition temperatures are also of interest to researchers because of their higher ionic conductivity.
During the charging and discharging process of lithium battery, Li+ is the effective carrier. The migration of anions in the electrolyte will increase the concentration polarization of the electrolyte system, so the polymer lithium single ion conductor with no migration of anions and a Li+ migration number close to 1 is also A class of ASPEs materials with research value.
Regarding the application prospects and future development direction of all-solid polymer electrolytes, the research focus of PEO-based systems is to develop organic-inorganic composite systems, and the research of polycarbonate-based systems focuses on the development of blending systems with other polymers, polysiloxanes. The research of alkyl system focuses on enhancing the mechanical properties of the system. The research focus of polymer lithium single ion conductor system is to design a new polyanion lithium salt with higher ion conductivity.