Electrode plate as well as preparation method and application thereof

A technology of electrode pole piece and conductive agent, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of high battery production cost, poor safety, and high impedance of solid electrolyte membranes, so as to avoid thermal runaway and improve Safety, the effect of reducing the risk of thermal runaway

Pending Publication Date: 2022-05-03
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The impedance of the solid electrolyte membrane is large, and the production cost of the battery is high
[0006] The above solutions have problems such as high cost, poor safety, or high impedance. Therefore, it is necessary to develop an electrode pole piece for lithium-ion batteries with low cost, good safety, and low impedance.

Method used

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  • Electrode plate as well as preparation method and application thereof
  • Electrode plate as well as preparation method and application thereof
  • Electrode plate as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a soft pack battery, and the preparation method of the positive and negative pole pieces is as follows:

[0038]NCM811, carbon nanotubes, polytetrafluoroethylene resin PTFE and ethoxylated pentafluorocyclotriphosphazene were mixed according to the mass ratio of 95:2:2:1, and the positive active material film was obtained by dry rolling treatment. The positive electrode sheet is obtained by hot-compressing the positive electrode active material sheet film and the current collector at 100°C.

[0039] Graphite material, carbon nanotubes, polytetrafluoroethylene resin PTFE and ethoxylated pentafluorocyclotriphosphazene are mixed according to the mass ratio of 96:1:2:1, and the negative electrode active material film is obtained by dry rolling treatment , hot-compressing the negative electrode active material sheet film with the current collector at 120° C. to obtain the negative electrode sheet.

[0040] The positive and negative pole pieces were d...

Embodiment 2

[0042] This embodiment provides a soft pack battery, and the preparation method of the positive and negative pole pieces is as follows:

[0043] NCM811, carbon nanotubes, polytetrafluoroethylene resin PTFE and ethoxylated pentafluorocyclotriphosphazene are mixed according to the mass ratio of 95.5:2:2:0.5, and the positive active material film is obtained by dry rolling treatment. The positive electrode sheet is obtained by hot-compressing the positive electrode active material sheet film and the current collector at 100°C.

[0044] The graphite material, carbon nanotubes, polytetrafluoroethylene resin PTFE and ethoxylated pentafluorocyclotriphosphazene are mixed according to the mass ratio of 96.5:1:2:0.5, and the negative electrode active material electrode film is obtained by dry rolling treatment , hot-compressing the negative electrode active material sheet film with the current collector at 120° C. to obtain the negative electrode sheet.

[0045] The positive and negati...

Embodiment 3

[0047] This embodiment provides a soft pack battery, and the preparation method of the positive and negative pole pieces is as follows:

[0048] NCM811, carbon nanotubes, polytetrafluoroethylene resin PTFE and ethoxylated pentafluorocyclotriphosphazene were mixed according to the mass ratio of 93:2:2:3, and the positive active material film was obtained by dry rolling treatment. The positive electrode sheet is obtained by hot-compressing the positive electrode active material sheet film and the current collector at 100°C.

[0049] Graphite material, carbon nanotubes, polytetrafluoroethylene resin PTFE and ethoxylated pentafluorocyclotriphosphazene are mixed according to the mass ratio of 94:1:2:3, and the negative electrode active material film is obtained by dry rolling treatment , hot-compressing the negative electrode active material sheet film with the current collector at 120° C. to obtain the negative electrode sheet.

[0050] The positive and negative pole pieces were ...

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Abstract

The invention provides an electrode pole piece and a preparation method and application thereof, the positive pole piece comprises a current collector and an active substance layer arranged on the surface of the current collector, the active substance layer comprises an active material, a conductive agent, a binder and a fluorophosphazene additive, and the oxygen index of the binder is gt; according to the invention, the oxygen index gt is adopted; the 95% high-flame-retardant resin binder has a high flame-retardant characteristic and is uniformly distributed in the pole piece, so that the high-flame-retardant fluororesin binder quenches a fire point in the first time under the condition that the battery is abused, the occurrence of thermal runaway in the battery is avoided, the risk of thermal runaway caused by internal short circuit after the battery is abused is greatly reduced, and the service life of the battery is prolonged. And the fluorophosphazene additive forms a stable SEI film on the surface of the positive electrode material during the first formation, so that the side reaction of the electrolyte and the high-nickel ternary positive electrode is inhibited, the service life of the battery is prolonged, and the safety of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an electrode pole piece and a preparation method and application thereof. Background technique [0002] Lithium-ion battery is one of the best-developed battery varieties of secondary batteries at present, which has the advantages of high energy density, long cycle life and environmental protection. The advantages of small size and high energy density of lithium-ion batteries make them widely used in 3C digital and new energy vehicles, and will also occupy an important place in the future smart grid and energy storage fields. The advantages of high energy density of lithium-ion batteries enable the lithium battery industry to rapidly develop into an industry with the largest market share and annual growth rate in the field of secondary batteries. However, it must be soberly aware that at present, lithium-ion batteries still have not fundamentally solved safety issues...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62
CPCH01M4/13H01M4/139H01M4/623
Inventor 张耀法秦士林肖强马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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