Silicon-based negative electrode slurry for lithium batteries, and preparation method thereof

A silicon-based negative electrode and lithium battery technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of rapid battery capacity decay, pulverization, and loss of contact with active materials, so as to maintain electrical connectivity and mechanical integrity. The effect of alleviating powdering and peeling of pole pieces and improving cycle performance

Inactive Publication Date: 2019-06-07
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the binders that have been used on a large scale, including SBR binder and LA133 binder, cannot effectively solve the above problems, and pulverization and volume expansion will still occur during the charge-discharge cycle, resulting in the loss of effective interaction between active materials. contact, resulting in problems such as rapid battery capacity decay and short cycle life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 5 parts of cross-linked polyacrylate to 40 parts of deionized water, stir for 20 minutes to obtain a binder solution; add 40 parts of silicon and 5 parts of conductive carbon black to the binder solution and disperse for 1 hour to obtain silicon for lithium batteries. Base negative electrode slurry.

Embodiment 2

[0028] Add 10 parts of cross-linked styrene-butadiene emulsion to 200 parts of deionized water and stir for 60 minutes to obtain a binder solution; add 100 parts of silicon-lithium alloy and 10 parts of conductive graphite to the binder solution and disperse for 12 hours to obtain a lithium battery. Silicon-based negative electrode slurry.

Embodiment 3

[0030] Add 2 parts of cross-linked polyacrylate to 90 parts of deionized water and stir for 40 minutes to obtain a binder solution; add 60 parts of silicon-carbon composites and 1.2 parts of carbon nanotubes to the binder solution and disperse for 6 hours to obtain lithium Silicon-based negative electrode paste for batteries.

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PUM

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Abstract

The invention discloses silicon-based negative electrode slurry for lithium batteries, and a preparation method thereof. The slurry includes 40-100 parts of a silicon-based active substance, 0.1-10 parts of a conductive agent, 0.5-10 parts of a cross-linking type binder, and 20-200 parts of deionized water. The active substance in the slurry can be uniformly dispersed in a binder crosslinking network, so that the problems of pole piece pulverization and poor cycle performance caused by volume expansion of a silicon-based negative electrode material during a charging and discharging cyclic process can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a silicon-based negative electrode slurry for lithium batteries and a preparation method thereof. Background technique [0002] At present, graphite materials are commonly used as negative electrodes in the production of lithium batteries. It has the advantages of long cycle life, low cost, and abundant resources. However, the theoretical specific capacity of graphite is only 372mAh / g, which cannot meet the development of high energy density of lithium batteries. Requirements; In addition, its lithium intercalation potential is very close to the deposition potential of lithium. When the battery is overcharged, lithium dendrites are easily formed on the electrode surface, causing fire or even explosion, which brings a huge safety hazard to the battery. Compared with graphite-based negative electrode materials, new silicon-based materials have higher specific capacity. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/48
CPCY02E60/10
Inventor 景希玮徐健
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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