Silane polymer for negative electrode bonding of lithium ion battery 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: 2022-08-02
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] First, add 25 g (0.305 mol) acrylic acid, 0.032 g initiator azobisisobutyronitrile, and 32 mL butyl acetate solvent into a four-necked round-bottomed flask, and continue to add 6.5 g (0.039 mol) vinyltrimethoxycarbonate under stirring. Silane was added dropwise to the four-necked flask; then the temperature was raised to 65°C, and the reaction was kept stirring for 12 h; the reaction solution obtained from the reaction was transferred to a rotary evaporator, and the excess solvent was evaporated to obtain a viscous solid; finally, the viscous solid was placed in a Vacuum-drying at 100° C. for 8 hours to obtain the silane polymer for bonding the negative electrode of the lithium ion battery.

[0042] The molar ratio of the ester compound to the silane compound is 0.75-10:1; the dosage 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 g (0.291 mol) methyl acrylate, 0.12 g initiator ammonium persulfate, and 40 mL ethyl propionate solvent into a four-necked round-bottomed flask, and continue to add 15 g (0.037 mol) vinyl trilactic acid under stirring Ethyl ester silane was added dropwise to the four-necked flask; then the temperature was raised to 85°C, and the reaction was kept stirring for 6 hours; the reaction solution obtained from the reaction was transferred to a rotary evaporator, and the excess solvent was evaporated to obtain a viscous solid; finally, the viscous solid was Vacuum drying was carried out at 100° C. for 8 hours to obtain the silane polymer for bonding the negative electrode of the lithium ion battery.

Embodiment 3

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

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Abstract

The invention discloses a method for preparing a silane polymer for bonding negative electrodes of lithium ion batteries, which comprises the following steps: 1) adding ester compounds, silane compounds, initiators and solvents into a reaction flask, heating the temperature to 65-85° C., Stir the reaction for 6-12 hours; 2) transfer the reaction solution of step 1) to a rotary evaporator, evaporate the solvent to obtain a viscous solid; 3) vacuum the viscous solid obtained in step 2) at 80-120 ° C Dry for 6-10 h to obtain the silane polymer for the negative electrode binding of the lithium ion battery. The binder silane polymer prepared by the invention introduces a large number of ester groups and alkoxy groups, has good polarity effect, can enhance the lithium ion transport ability during the battery cycle, thereby improving the electrochemical performance of the lithium ion battery performance.

Description

technical field [0001] The invention relates to a binder used in the field of lithium battery materials, in particular to a silane polymer used for bonding negative electrodes of lithium ion batteries 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 demand for energy by industry 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 burning of fossil energy brings a series of environmental problems: CO in the atmosphere 2 The content increased significantly, SO 2 , NO 2 Such harmful substances continue to increase, sea levels rise, and biological species decrease year by year. Faced with a wide range of energy and environmental problems, the most effective solution a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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