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Negative electrode composite material, preparation method thereof, and lithium ion battery

A lithium-ion battery and composite material technology, applied in the field of lithium-ion batteries, can solve the problems of low battery cycle efficiency, small reversible capacity, and affecting the overall performance of the battery, and achieve the effect of improving battery cycle stability and improving the first cycle efficiency

Active Publication Date: 2019-06-25
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although carbon materials have the advantages of good cycle performance and small volume changes during the lithium-deintercalation process, their surface carbon atoms have a large number of unsaturated bonds, and the electrolyte will decompose on their surfaces when they are first charged, and SEI (Solid Electrolyte Interface) film, so that the cycle efficiency of the battery is low when it is discharged for the first time, and the reversible capacity of the first discharge is small, thus affecting the overall performance of the battery

Method used

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  • Negative electrode composite material, preparation method thereof, and lithium ion battery
  • Negative electrode composite material, preparation method thereof, and lithium ion battery
  • Negative electrode composite material, preparation method thereof, and lithium ion battery

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preparation example Construction

[0033] The present application further provides a method for preparing a negative electrode composite material, including the steps of polymerizing a maleimide monomer with the organic diamine compound and compounding with the negative electrode active material.

[0034] The preparation method of the polymer is as follows: dissolving organic diamine compounds in an organic solvent to form a diamine solution; mixing maleimide monomers with organic solvents and preheating to form maleimide monomers The solution; the diamine solution is added to the preheated maleimide monomer solution, mixed and stirred to fully proceed the reaction to obtain the polymer.

[0035] The molar ratio of the maleimide monomer to the organic diamine compound may be 1:10-10:1, preferably 1:2-4:1. The mass ratio of the maleimide monomer to the organic solvent in the solution of the maleimide monomer may be 1:100-1:1, preferably 1:10-1:2. The preheating temperature of the maleimide monomer solution may ...

Embodiment 1

[0046] Dissolve 4g of bismaleimide (BMI) and 2.207g of diaminodiphenylmethane in γ-butyrolactone (10% solid content), remove the oxygen in the solution, and raise the temperature of the bismaleimide solution to 130°C, then add the diaminodiphenylmethane solution dropwise into the bismaleimide solution at a rate of 5 rpm / min, and keep it at 130°C for 24 hours after the dropping, and precipitate with methanol after cooling, wash and dry, Oligomer 1 was obtained.

Embodiment 2

[0048] Dissolve 4g of bismaleimide (BMI) and 2.207g of diaminodiphenylmethane in NMP (10% solid content) respectively, remove the oxygen in the solution, and raise the temperature of the bismaleimide solution to 80°C, Then add the diaminodiphenylmethane solution dropwise into the bismaleimide solution at a rate of 5 rpm / min, keep it at 80°C for 12 hours after dropping, and precipitate with methanol after cooling, wash and dry to obtain the oligomer 2.

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Abstract

The invention relates to a negative electrode composite material, which includes a negative electrode active material and a polymer compounded with the negative electrode active material. The polymer is obtained through a polymerization reaction of an organic diamine compound and a maleimide monomer. The maleimide The imide monomers include at least one of maleimide monomers, bismaleimide monomers, polymaleimide monomers and maleimide derivative monomers. The invention also relates to a preparation method of negative electrode composite material and lithium ion battery.

Description

technical field [0001] The invention relates to a negative electrode composite material, a preparation method thereof and a lithium ion battery using the negative electrode composite material. Background technique [0002] Lithium-ion battery is a new type of green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-hydrogen batteries, it has the advantages of high voltage, long life, and high energy density. Since Japan's Sony Corporation launched the first generation of lithium-ion batteries in 1990, it has developed rapidly and is widely used in various portable devices. In lithium-ion batteries, the performance of negative electrode materials is directly related to the capacity, cycle performance and safety performance of the battery. Existing negative electrode materials for lithium-ion batteries include metal oxides, metal sulfides, and carbon materials, such as graphite, acetylene black, microbead carbon, petroleum coke, carbon fiber,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCC08G73/00C08G73/12H01M4/0404H01M4/133H01M4/1393H01M4/628H01M10/0525Y02E60/10H01M4/0471H01M4/362H01M4/583H01M4/602H01M2004/027
Inventor 何向明钱冠男尚玉明李建军王莉杨聚平高剑赵鹏王要武
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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