New polymer electrolyte materials research and development background

Source: 2020 - 04 - The corners of 14 hits: times new single ion polymer electrolyte materials research and development background of the lithium ion battery has a large mass density, volume density, long cycle life and the advantages of reliability, is widely used in various kinds of electronic products and electric trams. The electrolyte is an important component of the lithium ion battery. Good electrolyte can greatly improve the efficiency of lithium ion batteries. Lithium ion transference number is lithium ion secondary battery electrolyte is an important property. The higher the number of lithium ion migration, lithium-ion battery energy efficiency is higher. When lithium ion transference number close to or reaches 1, reached the highest efficiency of the battery. This is because, in the lithium ion secondary battery, on the one hand, the migration of anion can lead to battery energy consumption; On the other hand, because of the negative ion migration velocity is faster than lithium ion, produces in the process of charging and discharging of electrolyte salt concentration gradient and the concentration polarization, and reduces the efficiency of the lithium ion battery. For the traditional liquid organic small molecule electrolyte, increase negative ion radius and scattered distribution of negative charge in the negative ion is an important approach to improve lithium ion transference number. Based on boron SP3 LiBOB electrolyte and based on the diffuse charge three fluorinated methyl sulfonyl imide N ( SO2CF3) 2 the electrolyte for lithium ion secondary battery electrolyte in the widely research and application. However, two kinds of electrolytes of lithium ion migration rate is far lower than 1. Another kind of lithium ion transference number close to 1 method is to increase the size of the negative ion, so that it is completely fixed. Based on this thought, in recent years, there is a new type of polymer electrolyte material single ion polymer electrolyte. Single ion polymer electrolyte is a new kind of polymer electrolyte, is characterized by a high number of lithium ion migration and the advantages of traditional polymer electrolyte. Based on the above research idea, need to have the preparation of a two single ion polymer electrolyte anion functional groups.