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Silane polymer for bonding lithium ion battery negative electrode and preparation method thereof

A lithium-ion battery, silane polymer technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inability to meet the requirements of mechanical flexibility of lithium battery binders, low reversible cycle capacity, etc., and achieve improved electrochemical performance. performance, good polarity effect, short duration effect

Active Publication Date: 2020-11-03
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this is just a simple mechanical mixing of various polymers, which cannot meet the mechanical flexibility requirements of lithium battery binders, and the initial reversible cycle capacity is low.

Method used

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  • Silane polymer for bonding lithium ion battery negative electrode and preparation method thereof
  • Silane polymer for bonding lithium ion battery negative electrode and preparation method thereof
  • Silane polymer for bonding lithium ion battery negative electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First, add 25 grams (0.305mol) of acrylic acid, 0.032 grams of initiator azobisisobutyronitrile, and 32 mL of butyl acetate solvent into a four-necked round-bottomed flask, and continue to add 6.5 grams (0.039mol) of vinyltrimethoxy Add base silane dropwise into the four-necked flask; then raise the temperature to 65°C, keep the temperature and keep stirring for 12 hours; transfer the reaction solution obtained from the reaction to a rotary evaporator, and evaporate the excess solvent to obtain a viscous solid; vacuum drying at 100° C. for 8 hours to obtain the silane polymer for negative electrode binding of lithium ion batteries.

[0042] The molar ratio of the ester compound to the silane compound is 0.75-10:1; the amount of the initiator is 0.1%-0.9% of the weight sum of the ester compound and the silane compound;

Embodiment 2

[0044] First, add 25 grams (0.291mol) of methyl acrylate, 0.12 grams of initiator ammonium persulfate, and 40 mL of ethyl propionate solvent into a four-necked round-bottomed flask, and continue to add 15 grams (0.037mol) of vinyl trilactic acid under stirring. Ethyl silane was added dropwise into a four-necked flask; then the temperature was raised to 85°C, and the temperature was kept stirring for 6 hours; Vacuum drying at 100° C. for 8 hours to obtain the silane polymer for negative electrode binding of lithium ion batteries.

Embodiment 3

[0046] First, add 25 grams (0.250mol) of ethyl acrylate, 0.13 grams of initiator azobisisobutyronitrile, and 44 mL of butyl acetate solvent into a four-necked round-bottomed flask, and continue to add 19 grams (0.037mol) of acrylic acid under stirring. Add ethyl trilactate silane dropwise into the four-necked flask; then raise the temperature to 70°C, keep the temperature and keep stirring for 10 hours; transfer the reaction solution obtained from the reaction to a rotary evaporator, and evaporate the excess solvent to obtain a viscous solid; finally, the viscous The thick solid was vacuum-dried at 80° C. for 10 h to obtain the silane polymer for negative electrode binding of lithium ion batteries.

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Abstract

The invention discloses a preparation method of a silane polymer for bonding a lithium ion battery negative electrode, which comprises the following steps: 1) respectively adding an ester compound, asilane compound, an initiator and a solvent into a reaction flask, heating the components to 65-85 DEG C, and stirring the components to react for 6-12 hours; 2) transferring the reaction solution obtained in the step 1) into a rotary evaporator, and evaporating the solvent to obtain a viscous solid; and 3) carrying out vacuum drying on the viscous solid obtained in the step 2) at the temperatureof 80-120 DEG C for 6-10 h to obtain the silane polymer for bonding the lithium ion battery negative electrode. According to the prepared binder silane polymer, a large number of ester groups and alkoxy groups are introduced, a good polarity effect is achieved, the lithium ion transmission capacity in the battery circulation process can be enhanced, and therefore the electrochemical performance ofa lithium ion battery is improved.

Description

technical field [0001] The invention relates to a binder used in the field of lithium battery materials, in particular to a silane polymer for lithium ion battery negative electrodes and a preparation method thereof. Background technique [0002] The survival and development of human beings are inseparable from the support of energy. With the rapid development of the world economy, the industry's demand for energy is increasing day by day. At present, human survival and industrial development mainly rely on fossil energy such as coal, oil, and natural gas. However, fossil energy belongs to non-renewable energy, and the combustion of fossil energy has brought a series of environmental problems: CO in the atmosphere 2 content increased significantly, SO 2 , NO 2 Harmful substances and other harmful substances continue to increase, sea levels rise, and biological species decrease year by year. In the face of a wide range of energy and environmental problems, the most effect...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/14C08F220/18C08F230/08H01M4/62H01M10/0525
CPCC08F220/06C08F220/14C08F220/1802C08F230/085C08F220/1803C08F220/1804H01M4/622H01M10/0525Y02E60/10
Inventor 张群朝史明慧杨纪元蒋涛施德安郝同辉
Owner HUBEI UNIV
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