Coating, aqueous flexible anode piece prepared through adopting it, and lithium ion battery

A positive electrode sheet, water-based technology, applied in the direction of non-aqueous electrolyte battery electrodes, conductive coatings, coatings, etc., can solve the problems that cannot meet the requirements of lithium-ion batteries, limit the practical application of positive electrode sheets, and have high brittleness of positive electrode sheets. Requirements for electrochemical performance, strong coating adhesion, and the effect of overcoming brittleness

Active Publication Date: 2012-12-19
中创新航科技(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the positive electrode sheet produced by the existing water-based positive electrode binder system is relatively brittle and poor in flexibility, which cannot meet the requirements of lithium-ion batteries, which severely limits the practical application of the positive electrode sheet.

Method used

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  • Coating, aqueous flexible anode piece prepared through adopting it, and lithium ion battery
  • Coating, aqueous flexible anode piece prepared through adopting it, and lithium ion battery
  • Coating, aqueous flexible anode piece prepared through adopting it, and lithium ion battery

Examples

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Effect test

Embodiment 1

[0038] This example is used to prepare a coating for a water-based flexible positive electrode sheet, and its effective component composition is shown in Table 1. The preparation method of the coating used to prepare the water-based flexible positive electrode sheet in this embodiment is: weigh each component according to the composition of the water-based flexible positive electrode sheet coating, and weigh 5152g of LiFePO 4 , 56g gum arabic, 112g organosilicon rubber emulsion and 280g conductive carbon black, then gum arabic is dissolved in 1120g water, obtain mixed solution A, add conductive carbon black in mixed solution A and mix homogeneously, get mixed solution B, then to Add LiFePO in batches to the mixture B 4 , and mix uniformly to obtain a mixed solution C, and then add a silicone rubber emulsion to the mixed solution C, and mix evenly to obtain a water-based flexible positive electrode coating.

Embodiment 2

[0040] This example is used to prepare a coating for a water-based flexible positive electrode sheet, and its effective component composition is shown in Table 1. The preparation method of the coating used to prepare the water-based flexible positive electrode sheet in this embodiment is: weigh each component according to the composition of the water-based flexible positive electrode sheet coating, and weigh 9000g of LiFePO 4 , 50g acrylamide-acrylonitrile copolymer, 150g silicone rubber emulsion and 800g conductive carbon black, acrylamide-acrylonitrile copolymer is dissolved in 1500g water afterwards, obtain mixed solution A, add conductive carbon black in mixed solution A and Mix well to get mixed solution B, then add LiFePO to mixed solution B in batches 4 , and mix uniformly to obtain a mixed solution C, and then add a silicone rubber emulsion to the mixed solution C, and mix evenly to obtain a water-based flexible positive electrode coating.

Embodiment 3

[0042]This example is used to prepare a coating for a water-based flexible positive electrode sheet, and its effective component composition is shown in Table 1. The preparation method of the coating used to prepare the water-based flexible positive electrode sheet in this embodiment is: weigh each component according to the composition of the water-based flexible positive electrode sheet coating, and weigh 9800g of LiFePO 4 , 50g gum arabic, 100g poly(styrene-butadiene) emulsion and 50g conductive carbon black, gum arabic is dissolved in 1250g water afterwards, obtain mixed solution A, add conductive carbon black and mix homogeneously in mixed solution A, get mixed solution B, and then add LiFePO to mixed solution B in batches 4 , and mix uniformly to obtain a mixed solution C, then add poly(styrene-butadiene) emulsion to the mixed solution C, and mix evenly to obtain a water-based flexible positive electrode coating.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and concretely discloses a coating used for preparing an aqueous flexible anode piece, the aqueous flexible anode piece prepared through adopting the coating, and a lithium ion battery adopting the anode piece. The coating used for preparing the aqueous flexible anode piece is basically composed of 90-98wt% of an anode powder, 0.5-3wt% of an aqueous dispersant, 1-5wt% of an aqueous thermoelastic binder and 0.5-8wt% of a conductive agent. The flexibility of the anode piece prepared through adopting the aqueous flexible anode piece coating is good, so a defect of large brittleness of present aqueous anode pieces is overcome; and the adhesion of the prepared anode piece is strong, so requirements of various battery making technologies can be satisfied, and requirements of various electrochemical performances are satisfied.

Description

technical field [0001] The invention relates to the technical field of energy storage devices such as lithium-ion batteries, in particular to a coating for preparing a water-based flexible positive electrode sheet, a water-based flexible positive electrode sheet prepared by using the coating, and a lithium-ion battery using the positive electrode sheet. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high energy density, long cycle life, small self-discharge, no memory effect, and environmental friendliness. Lithium-ion batteries have become the most ideal for communications, power tools, electric vehicles, aerospace and other equipment. mobile power supply. [0003] At present, the production process of the electrode sheets used in lithium-ion batteries is to first bond the binder with the electroactive material and the conductive agent to form a slurry with a suitable viscosity, and then make the electrode sheets throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D125/10C09D109/02C09D123/08C09D127/18C09D5/24C09D7/12H01M4/13H01M4/04
CPCY02E60/122Y02E60/10
Inventor 怀永健王海文徐雪菲杨晓伟
Owner 中创新航科技(江苏)有限公司
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