Binder for lithium ion battery silicon-based negative electrode, negative electrode and preparation method thereof

A technology for lithium-ion batteries and silicon-based negative electrodes, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as damaged electrode structures, poor cycle performance, and loss of electrical contact, and achieves simple processes, improved Coulombic efficiency, and the first time The effect of improving efficiency

Active Publication Date: 2018-10-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, in order to develop rechargeable lithium-ion batteries with high energy density, a lot of work has focused on silicon-based anode materials because of the ultra-high theoretical capacity of silicon (4200mAh / g), but due to the accompanying The large volume effect leads to the pulverization of silicon particles, the loss of electrical contact with the conductive agent, and the destruction of the entire electrode structure, resulting in capacity attenuation and poor cycle performance

Method used

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  • Binder for lithium ion battery silicon-based negative electrode, negative electrode and preparation method thereof
  • Binder for lithium ion battery silicon-based negative electrode, negative electrode and preparation method thereof
  • Binder for lithium ion battery silicon-based negative electrode, negative electrode and preparation method thereof

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Embodiment 1

[0028] A kind of binding agent for silicon-based negative electrode of lithium ion battery that the present invention proposes is the maleic anhydride acylated chitosan m-CS that chitosan is carried out acylation modification by maleic anhydride, and its chemical formula is:

[0029]

[0030] The specific preparation is as follows: Weigh a certain amount of maleic anhydride and dissolve it in DMF to obtain a 5g / mL dispersion, then add CS, the mass ratio of chitosan to maleic anhydride is 1:3, N 2 After the temperature was raised to 120°C under the atmosphere, the reaction was continued for 3 hours, and finally the reaction solution was poured into ice water for precipitation, washed with ether three times and then dried to obtain the binder m-CS for silicon-based negative electrodes of lithium-ion batteries.

[0031] The present invention also proposes a lithium-ion battery silicon-based negative electrode containing the above-mentioned binder, which is prepared as follows: ...

Embodiment 2

[0033] A kind of binding agent for silicon-based negative electrode of lithium ion battery that the present invention proposes is the maleic anhydride acylated chitosan m-CS that chitosan is carried out acylation modification by maleic anhydride, and its chemical formula is:

[0034]

[0035] The specific preparation is as follows: Weigh a certain amount of maleic anhydride and dissolve it in DMF to obtain a 10g / mL dispersion, then add CS, the mass ratio of chitosan to maleic anhydride is 1:1, N 2 After the temperature was raised to 150°C under the atmosphere, the reaction was continued for 5 hours, and finally the reaction solution was poured into ice water for precipitation, washed with ether three times and then dried to obtain the binder m-CS for silicon-based negative electrodes of lithium-ion batteries.

[0036] The present invention also proposes a lithium-ion battery silicon-based negative electrode containing the above-mentioned binder, which is prepared as follows:...

Embodiment 3

[0038] A kind of binding agent for silicon-based negative electrode of lithium ion battery that the present invention proposes is the maleic anhydride acylated chitosan m-CS that chitosan is carried out acylation modification by maleic anhydride, and its chemical formula is:

[0039]

[0040] The specific preparation is as follows: weigh a certain amount of maleic anhydride and dissolve it in DMF to obtain a dispersion of 8 g / mL, then add CS, the mass ratio of chitosan to maleic anhydride is 1:2, N 2 After the temperature was raised to 140°C under the atmosphere, the reaction was continued for 4 hours, and finally the reaction solution was poured into ice water for precipitation, washed with ether three times and then dried to obtain the binder m-CS for silicon-based negative electrodes of lithium-ion batteries.

[0041] The present invention also proposes a lithium-ion battery silicon-based negative electrode containing the above-mentioned binder, which is prepared as follo...

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PUM

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Abstract

The invention discloses a binder for a lithium ion battery silicon-based negative electrode, a negative electrode and a preparation method thereof, related to the technical field of a lithium ion battery. The binder for the lithium ion battery silicon-based negative electrode is maleic anhydride acylated chitosan m-CS obtained by acylating chitosan with maleic anhydride. The binder for the lithiumion battery silicon-based negative electrode disclosed by the invention improves the cycling performance of the silicon-based negative electrode, improves the first coulomb efficiency of the silicon-based negative electrode material to a certain degree, reduces the using amount of the binder in the silicon-based negative electrode system, and benefits improving the overall energy density of the lithium ion battery; and the preparation method is simple, which is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a binder for a silicon-based negative electrode of a lithium ion battery, a negative electrode and a preparation method. Background technique [0002] In recent years, in order to develop rechargeable lithium-ion batteries with high energy density, a lot of work has focused on silicon-based anode materials because of the ultra-high theoretical capacity of silicon (4200mAh / g), but due to the accompanying The large volume effect leads to the pulverization of silicon particles, the loss of electrical contact with the conductive agent, and the destruction of the entire electrode structure, resulting in capacity attenuation and poor cycle performance. A very important way to solve these problems is to find a suitable binder. The common ones are PAA, CMC / SBR, sodium alginate, chitosan, PI, PAI, etc. Among them, chitosan has a wide range of sources and is The molecular ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/622H01M10/0525Y02E60/10
Inventor 谢李昭谢李生杨立铭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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