Ultralow temperature discharge electrolyte of novel lithium ion battery

Abstract

The invention relates to ultralow temperature discharge electrolyte of a novel lithium ion battery. The electrolyte comprises the following raw materials in percent by weight: component A, namely 10-15 percent of conductive lithium salt, component B, namely 80-90 percent of organic solvent and component C, namely 2-8 percent of additive. The electrolyte has extremely high electrochemical stability. The freezing point is lowered, the ion migration capability is improved, the electrical conductivity is improved, the lithium ion transfer resistance is reduced, and the wettability of the electrolyte on a diaphragm under low-temperature conditions and the penetrability of the lithium ion to the diaphragm are improved. Therefore, the electrolyte has the characteristics of being capable of normally working in an environment with temperature of 50 DEG C below zero and being stable in performance and excellent in cycle indicators.

Description

technical field

[0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an electrolysis method for a novel lithium-ion battery discharged at ultra-low temperature Background technique

[0002] As the marketization of lithium-ion batteries continues to deepen, people's expectations for battery performance are getting higher and higher. At present, it is difficult for commercialized lithium-ion batteries to meet the needs of important fields such as electric vehicles, aerospace technology, and military affairs. One of the main reasons is that the performance of batteries is not good at high and low temperatures. A broadening of the working temperature agenda is the focus of lithium-ion batteries. key issues.

[0003] It has been proved to be a feasible technical approach to improve the temperature performance by starting with the electrolyte, because as an ion conductor that plays a role in the battery, the performance of the...

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