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High-temperature lithium ion battery anode slice

A technology of lithium ion battery and positive pole piece, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of increased battery polarization and long process flow, and achieves improved solvent resistance, simple process, Reduce the effect of pole piece peeling

Active Publication Date: 2013-01-16
湖南华兴新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many types of materials for the second coating, and the process flow is long when preparing the slurry for the second coating.
At the same time, metal oxide particles are introduced into the pole piece, and some metal oxides cannot conduct electricity, which will inevitably increase the polarization of the battery.

Method used

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  • High-temperature lithium ion battery anode slice
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The active material in the cathode material coating is LiFePO 4 , the adhesive uses PVDF (polyvinylidene fluoride), the active material, the conductive agent, and the adhesive are mixed, and the adhesive accounts for 10% of the weight of the mixture, and the ratio of the active material and the conductive agent is 8:1 . The mixture was dissolved in the organic solvent N-methylpyrrolidone (NMP), stirred evenly until it was completely dissolved and there was no suspended matter, after slurrying, it was evenly coated on the current collector, and baked in vacuum at 110°C for 24h, with a pressure of 10 MPa Tablets for use. Mix PAA (polyacrylic acid) and conductive carbon SP in a weight ratio of 1:1, dissolve the mixture in the organic solvent N-methylpyrrolidone (NMP), stir evenly until it is completely dissolved and there is no suspended matter, and coat evenly after slurrying A lithium ion battery positive electrode with a protective coating is obtained on the spare bat...

Embodiment 2

[0034] The active material in the cathode material coating is LiMn 2 o 4 , the adhesive uses PVDF (polyvinylidene fluoride), the active material, the conductive agent, and the adhesive are mixed, and the adhesive accounts for 8% of the weight of the mixture, and the ratio of the active material and the conductive agent is 9:1 . The mixture was dissolved in the organic solvent N-methylpyrrolidone (NMP), stirred evenly until it was completely dissolved and there was no suspended matter, after slurrying, it was evenly coated on the current collector, and baked in vacuum at 100°C for 15h, with a pressure of 8 MPa Tablets for use. Mix PAANa (sodium polyacrylate) and conductive carbon KS-6 at a weight ratio of 2:1, dissolve the mixture in the organic solvent N-methylpyrrolidone (NMP), stir well until it is completely dissolved and there is no suspended matter, after pulping Uniform coating on spare battery pole pieces to obtain a lithium ion battery positive electrode with a prot...

Embodiment 3

[0036] The active material in the cathode material coating is LiFePO 4 , the adhesive uses PVDF (polyvinylidene fluoride), the active material, the conductive agent, and the adhesive are mixed, and the adhesive accounts for 9% of the weight of the mixture, and the ratio of the active material and the conductive agent is 8:1 . The mixture was dissolved in the organic solvent N-methylpyrrolidone (NMP), stirred evenly until it was completely dissolved and there were no more suspended matter, after slurrying, it was evenly coated on the current collector, and baked in vacuum at 100°C for 20h, with a pressure of 10MPa Tablets for use. Mix PAAK (potassium polyacrylate) and conductive carbon VGCF at a weight ratio of 3:1, dissolve the mixture in the organic solvent N-methylpyrrolidone (NMP), stir well until it is completely dissolved and there is no suspended matter, and evenly coat the mixture after making slurry The positive electrode of the lithium-ion battery with protective co...

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Abstract

The invention relates to the field of lithium ion battery electrode slice preparation, and discloses a high-temperature lithium ion battery anode slice and a preparation method thereof; the anode comprises a current collector, and an anode material coating coated on the current collector, and also comprises a protective coating coated on the anode material coating. The protective coating is a mixture of polyacrylic acid and a conductive agent. The battery anode slice prepared by the invention has good solvent resistance, and the preparation method of the invention prevents the generation of phenomena of electrode slice stripping, pull-up, and the like. Meanwhile, the service life of the battery at high temperature is increased, and the high-temperature storage performance and safety performance of the battery are improved.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion battery pole pieces, in particular to a high-temperature type lithium-ion battery positive pole piece and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become one of the important new energy sources in the new era due to their high energy density, high operating voltage, long cycle life, and low self-discharge. And it is widely used in various fields such as national defense and military industry, agricultural production, transportation, etc. With the development of social productivity and the continuous advancement of science and technology, research and improvement of high-temperature performance of lithium-ion batteries make it suitable for extremely harsh conditions become necessary. Generally speaking, the high temperature performance of the battery refers to the electrical performance of the lithium-ion battery within the range between room ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62
CPCY02E60/122Y02E60/10
Inventor 张治安曾涛卢海贾明赖延清李劼刘晋
Owner 湖南华兴新能源科技有限公司
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