Flame-retardant lithium battery electrolyte

Abstract

The invention relates to a flame-retardant lithium battery electrolyte. The flame-retardant lithium battery electrolyte comprises the following components in parts by weight: 21-25 parts of dimethyl sulfoxide, 1-5 parts of tribromoethane, 25-31 parts of dibromomethylfuran, 5-11 parts of pyrrolidone, 15-21 parts of potassium methylsulfonylimine, 1-5 parts of lithium phosphate, 1-5 parts of sodium carboxymethylcellulose, 1-5 parts of sodium polyaspartate and 1-5 parts of p-phenylenediamine oxalate. The invention provides the flame-retardant lithium battery electrolyte, so that the using capacityof a lithium battery can be higher than 80% of the theoretical capacity thereof.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a flame retardant lithium battery electrolyte. Background technique [0002] In lithium-ion batteries, lithium metal and carbon materials can be used as anode materials, and when lithium metal is used as the anode material, it can provide large capacity and high output voltage. The electrolyte currently used is mainly composed of organic solvent and lithium salt, and this electrolyte is prone to chemical reaction with lithium metal, resulting in uneven passivation of the surface of lithium metal, so that dendrites appear during the charging and discharging process, and the battery fails. In addition, organic solvents are flammable and explosive, and there are potential safety hazards; and the life of conventional lithium batteries is generally 500 charge-discharge cycles, and the excellent ones can reach 600 charge-discharge cycles. As an important part of lithium batteries, electrolyt...

AI Technical Summary

Problems solved by technology

The currently used electrolyte is mainly composed of organic solvents and lithium salts, and this electrolyte is prone to chemical reactions with lithium metal, resulting in uneven passivation of the lithium metal surface, resulting in dendrites during charging and discharging, making the battery invalid. Moreover, organic solvents are flammable and explosive, and there are potential safety hazards; and the life of conventional lithium batteries is generally 500 charge-discharge cycles, and the excellent ones can reach 600 charge-discharge cycles

As an important part of lithium batteries, electrolyte has a direct impact on the life of lithium batteries. Traditional lithium battery electrolytes have large internal resistance, poor stability, and are sensitive to temperature, especially in high-temperature environments. The stability of lithium battery electrolytes will decrease. A sharp decrease, there is a great security risk