A kind of boron series compound branched carboxylated nitrile rubber and its preparation method and application

Abstract

The invention relates to the technical fields of light industry and chemical materials, particularly a boron compound branched carboxy nitrile rubber, and a preparation method and application thereof. The boron compound branched carboxy nitrile rubber is prepared by carrying out esterification reaction on carboxy nitrile rubber and a boron compound disclosed as Formula G. The boron compound branched carboxy nitrile rubber can be used as a polymer electrolyte of a lithium ion battery. The boron compound branched carboxy nitrile rubber has an anionic receptor group capable of performing the functions of stably dissociating anions and inhibiting oriented migration of anions. Besides, the branched structure of the boron compound branched carboxy nitrile rubber can effectively enhance the motility of the molecule segment and promote the migration of the lithium ions. Therefore, when being used as a polymer electrolyte of a lithium ion battery, the boron compound branched carboxy nitrile rubber provided by the invention has the advantage of high room-temperature or high-temperature electric conductivity, and can avoid electrode polarization and high ion migration number.

Description

technical field [0001] The invention relates to the technical field of light industry and chemical materials, in particular to a boron compound branched carboxylated nitrile rubber and its preparation method and application. Background technique [0002] In recent years, there is a strong demand for lithium-ion batteries with high operating voltage, high energy density, high energy efficiency, long cycle life, low self-discharge rate, low pollution, no memory effect, and good safety. Traditional lithium-ion batteries mostly use organic solvents (such as propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC)) as electrolytes, which are volatile, flammable, and safe for leakage Hidden danger. [0003] To solve these above-mentioned problems, attempts have been made to develop a solid polymer electrolyte, a new class of ion conductors to replace conventional electrolytes, for use in Li-ion battery devices. In the 1970s, solid electrolytes have been explor...

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Problems solved by technology

In the 1970s, solid electrolytes have been explored abroad. At present, the matrix used to prepare solid polymer electrolytes is mostly polyethylene oxide (PEO). The preparation methods mainly include: blending modification, copolymerization modification, grafting Branch modification, cross-linking modification, hyperbranching modification and compounding with inorganic materials, the purpose of these modification methods is mainly to inhibit the crystallization of the polymer and increase the proportion of the amorphous phase of the solid polymer electrolyte, but the obtained solid state The conductivity of the polymer electrolyte is low, and at the same time, due to the directional migration of anions, it is easy to cause the polarization of the electrode

The single-ion electrolyte is a system in which anions are fixed on the polymer matrix. The single-ion system can well solve the polarization phenomenon of the electrode caused by the directional migration of anions and increase the migration number of lithium ions. However, because the conductive ions of the single-ion system are only Lithium ions, resulting in low room temperature ionic conductivity

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