Non-aqueous electrolyte containing maleimide admixture and alkali metal secondary battery containing the non-aqueous electrolyte

Abstract

The invention relates to non-water electrolyte comprising an additive of maleimide and a secondary battery comprising the non-water electrolyte. The non-water electrolyte comprising an additive of maleimide comprises: an electrolyte of alkali salt; a nonaqueous solvent and an additive comprising maleimide, wherein, the additive comprising maleimide comprises a maleimide, a second maleimide, an oligomer of the second maleimide and a combination thereof.

Description

technical field [0001] The present invention relates to an electrolytic solution and a secondary battery containing it. More specifically, the present invention relates to a nonaqueous electrolytic solution containing a maleimide additive and a secondary battery containing it. Background technique [0002] With the development of portable electronic products in the direction of "light, thin, short, and small", electronic components are also gradually miniaturized, especially for high-performance secondary batteries with small size, light weight, and high energy density. . Many products such as cameras, mobile phones, notebook computers, electric vehicles and power storage systems (such as uninterruptible power supply systems) strive to be wireless, portable and multifunctional. In terms of power supply, more It requires long use time, light weight, high stability and safety. [0003] In addition, with the rising awareness of environmental protection, various application pr...

AI Technical Summary

Problems solved by technology

At present, electrolytes containing ethylene carbonate and propylene carbonate are commonly used in the industry, the voltage can reach 3.6V, and the energy density can reach 250-300Wh / L (or 90-110Wh / kg); however, due to carbonic acid Ethylene Carbonate (EC) is a solvent with a melting point as high as 37 degrees Celsius, resulting in poor battery performance at low temperatures, while Propylene Carbonate (PC) is prone to "co-migration" with lithium ions. When the potential reaches the reduction potential of PC, PC will undergo reductive cracking, and at the same time, gas will be generated to cause structural damage to the negative electrode. Therefore, the content of PC in the electrolyte is too high. When high, tends to cause a reduction in battery life

In addition, the electrolyte system composed of ethylene carbonate and propylene carbonate still has problems such as thermal stability, flame resistance, and safety functions; therefore, how to maintain the battery performance after charging and discharging, and at the same time have good high performance Low temperature life cycle performance, electrochemical stability, wettability, thermal stability, flame resistance, and safety functions are all problems that need to be solved and overcome when introducing additives into the electrolyte

[0006] Generally, the electrolyte system of commercial ethylene carbonate and propylene carbonate combination, in addition to adjusting the ratio of solvent components to improve the performance of the battery, often add such as dimethyl carbonate (DimethylCarbonate, DMC), diethyl carbonate (Diehtyl Carbonate, DEC) and ethyl methyl carbonate (EthylMethyl Carbonate, EMC), vinylene carbonate (Vinylene Carbonate), sulfites (sulfites), sulfates (sulfates), phosphate ester or its derivative compounds and other additives , to increase and improve battery life, capacity, and low-temperature performance; however, the gain in battery electrical performance is still very limited, and there are many aspects such as high-temperature life cycle performance, thermal stability, flame resistance, and safety functions. Unsolved and overcome problems exist

Images