A dendritic aqueous binder, negative electrode sheet, battery and method
A water-based binder and dendritic technology, applied in the direction of non-aqueous electrolyte batteries, grafted polymer binders, non-aqueous electrolyte battery electrodes, etc., can solve the problem of negative electrode active material falling off and so on
Active Publication Date: 2022-06-03
JIANGSU ADVANCED MATERIAL TECH CO LTD
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Problems solved by technology
[0008] One of the objectives of the present invention is to solve the problem that the negative electrode binder in the prior art has adhesive failure in the middle and late stages of the cycle and the negative electrode active material falls off from the current collector
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Abstract
The invention discloses a dendritic water-based binder, a negative electrode pole piece, and a battery, and relates to the technical field of lithium ion batteries. It contains a main chain and a side chain, and the side chain contains at least one of ester, organic acid, amide, and organic acid salt. group of polymers. The main chain in this binder is nano-cellulose material, which has the properties of high aspect ratio, high toughness and high modulus. At the same time, nano-cellulose can extend and bond different negative electrode particles, through the side chain Polymer, the binder of different negative electrode particles together. In this way, different aqueous binder chains are entangled with each other, so that the entire binder presents a "network-like" bonding effect, which can effectively adapt to the volume of negative electrode particles (especially silicon particles) in the process of deintercalating lithium. Variation effect, preventing the destruction of the conductive network. At the same time, the network-like coating and bonding of negative electrode particles inhibits the pulverization effect during the expansion of silicon particles.
Description
A dendritic water-based binder, negative electrode sheet, battery and method technical field The present invention relates to the technical field of mechanical seals for submarines, in particular to a kind of dendritic water-based binder, negative electrode pole piece, Battery. Background technique At present, with the development of mobile electronic products and electric vehicle industry, the demand for high energy density ion batteries [0002] The demands are becoming more and more urgent. Among them, the use of silicon materials (silicon carbon and silicon oxygen) to improve the energy density of the negative electrode of lithium batteries is currently recognized. One of the feasible solutions to improve the energy density of lithium batteries. Negative electrode binder is mainly the effect that negative electrode active material, conductive agent and dispersant etc. are bonded on current collector, At present, the main anode binders are polyvinylidene fluoride...
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IPC IPC(8): C09J151/02C09J151/08C08F251/02C08F290/06C08F220/06C08F220/56C08F220/58H01M4/62H01M4/13H01M4/139H01M10/052
CPCC09J151/02C09J151/08C08F251/02C08F290/062H01M4/621H01M4/13H01M4/139H01M10/052C08F220/06C08F220/56C08F220/585Y02E60/10
Inventor 杨浩田王晓明刘勇标张磊包慧
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD