Dispersing agent for positive and negative electrode materials of lithium ion battery

Abstract

The invention discloses a dispersing agent for positive and negative electrode materials of a lithium ion battery. A surface active agent of the dispersing agent is modified polyoxyethylene ether. Compared with the prior art, the dispersing agent has the advantages that 1) an addition method is simple; 2) the dispersing effect is good; 3) the application range is wide; 4) the electrochemical performance is stable; 5) the low-temperature performance of the battery can be improved; and 6) the safety performance of the battery can be improved, and safety tests in terms of over-charging, nail penetrating, side compression, weight impact and the like are improved.

Description

technical field [0001] The invention relates to a dispersant, in particular to a dispersant which has a better dispersant effect on positive and negative electrode materials of lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, high operating voltage, wide application temperature range, and long cycle life, lithium-ion batteries are widely used as power sources for various mobile devices, even in aviation, aerospace, navigation, automobiles, medical equipment and other fields. Gradually replace other traditional batteries, especially its high energy density has made an important contribution to the miniaturization of mobile devices. [0003] In the preparation process of lithium-ion batteries, there are usually difficulties in the dispersion of effective materials such as conductive carbon and active materials (such as graphite, lithium cobaltate, lithium manganese oxide, lithium nickel cobalt manganese, etc.), which leads to t...

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Problems solved by technology

[0003] In the preparation process of lithium-ion batteries, there are usually difficulties in the dispersion of effective materials such as conductive carbon and active materials (such as graphite, lithium cobaltate, lithium manganese oxide, lithium nickel cobalt manganese, etc.), which leads to the insufficient performance of the battery and affects the Improvement of battery energy density and application of lithium-ion batteries in high and low temperature, safety and other fields

[0004] In order to overcome the above defects, positive and negative materials with better structure, such as secondary particles, carbon-coated materials, and nano-modified materials, etc. are usually used. Although this can improve some performance of the battery, it cannot significantly improve the electrochemical performance of the battery. performance

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