Silicon-based negative binder and preparation method thereof

A silicon-based negative electrode and binder technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of non-fracture of cycle performance, poor expansion inhibition of silicon-based negative electrode, and rupture and differentiation of negative electrode active materials.

Inactive Publication Date: 2019-05-17
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The advantages of using a silicon-based negative electrode are obvious. However, in the actual application process, the most important defect is: during the recharge-discharge cycle of the silicon-based negative electrode, the volume continues to expand, up to 300%, causing the active material of the negative electrode to rupture and differentiate. In contact with the ele

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment provides a preparation method of a silicon-based negative electrode binder, the preparation method comprising the following steps:

[0054] Mix 7 parts of tert-butyl methacrylate, 1 part of tris(2-dimethylaminoethyl)amine, 1 part of cuprous chloride, 0.05 parts of the first initiator and 7 parts of dimethyl sulfoxide, freeze-thaw cycle After removing the oxygen and water in the system three times, react at 15°C for 10 hours under nitrogen atmosphere, and obtain the first polymer after the reaction;

[0055] Mix 6 parts of n-butyl acrylate, 2 parts of tris(2-dimethylaminoethyl)amine, 1 part of copper chloride, 0.05 part of the second initiator and 6 parts of dimethyl sulfoxide, and freeze-thaw cycle 3 times to remove After the oxygen and water in the system, add 0.05 parts of copper powder, react at 15°C for 10 hours under nitrogen atmosphere, and obtain the second polymer after the reaction;

[0056] Mix 5 parts of the first polymer and 10 parts of the ...

Embodiment 2

[0059] This embodiment provides a preparation method of a silicon-based negative electrode binder, the preparation method comprising the following steps:

[0060] Mix 10 parts of acrylonitrile, 4 parts of 4,4'-dinonyl-2,2'-bipyridine, 3 parts of cuprous chloride, 0.1 part of the first initiator and 10 parts of tetrahydrofuran, and freeze-thaw cycle 5 times to remove After oxygen and water in the system, react at 35°C for 8h under a helium atmosphere, and obtain the first polymer after the reaction;

[0061] Mix 10 parts of methyl methacrylate, 5 parts of 4,4'-dinonyl-2,2'-bipyridine, 3 parts of copper chloride, 0.2 parts of the second initiator and 10 parts of tetrahydrofuran, freeze-thaw cycle 5 After removing oxygen and water in the system for the first time, add 0.4 parts of copper powder, and react at 35°C for 10 hours under a helium atmosphere, and obtain the second polymer after the reaction is completed;

[0062] Mix 9 parts of the first polymer and 5 parts of the seco...

Embodiment 3

[0065] This embodiment provides a preparation method of a silicon-based negative electrode binder, the preparation method comprising the following steps:

[0066] Mix 8 parts of methyl methacrylate, 2 parts of pentamethyldiethylenetriamine, 1.5 parts of cuprous chloride, 0.08 parts of the first initiator and 8 parts of chloroform, and freeze-thaw cycle 3 times to remove oxygen and water in the system Finally, react at 20°C for 9h under a nitrogen atmosphere, and obtain the first polymer after the reaction is completed;

[0067] Mix 8 parts of n-butyl methacrylate, 3 parts of pentamethyldiethylenetriamine, 1.8 parts of copper chloride, 0.1 part of the second initiator and 8 parts of chloroform, and freeze-thaw cycle 3 times to remove oxygen and water in the system Finally, add 0.1 part of copper powder, react at 20°C for 9 hours under a nitrogen atmosphere, and obtain the second polymer after the reaction is completed;

[0068] Mix 6 parts of the first polymer and 8 parts of t...

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PUM

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Abstract

The invention provides a silicon-based negative binder which is an amphiphilic block copolymer modified by fluorinated organic acid, and the block copolymer is obtained by the reaction of two different polymers prepared in advance. The binder can effectively suppress the expansion of the silicon-based negative electrode, so that the silicon negative battery exhibits good cycle performance. The preparation method has the advantages of simple synthesis method, simple process and suitability for industrial production.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a negative electrode binder, in particular to a silicon-based negative electrode binder and a preparation method thereof. Background technique [0002] With the rise of new energy vehicles, power batteries have become a key component of new energy vehicles, and power batteries have become an area that OEMs focus on and even deploy. Compared with traditional fuel vehicles, electric vehicles are more environmentally friendly and have received strong support from the state. The Ministry of Industry and Information Technology and the National Development and Reform Commission issued a notice stating that by 2020, the specific energy of a single power battery must reach 300wh / kg, and to achieve such a high energy density, The traditional graphite negative electrode is powerless. At present, a more realistic solution is to use silicon-based negative electrodes. In comparison, the theoret...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 李辉侯桃丽王辉苗培霜刘金成
Owner EVE ENERGY CO LTD
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