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Sizing agents for external coatings of positive and negative electrode coils of lithium ion batteries

A lithium-ion battery, positive and negative electrode technology, applied in the direction of battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of large diaphragm consumption, low battery energy density, short cycle life, etc., to avoid lithium dendrites , long cycle life, and the effect of improving energy density

Inactive Publication Date: 2016-06-15
JIANGSU FRONT NEW ENERGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy density of the battery made by this technology is relatively low, and the problem of high consumption of the base metal foil and the separator for interlayer insulation
Therefore, this technological improvement cannot fundamentally solve the problem of short cycle life of the positive and negative electrodes of lithium-ion batteries under high-rate conditions.

Method used

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  • Sizing agents for external coatings of positive and negative electrode coils of lithium ion batteries
  • Sizing agents for external coatings of positive and negative electrode coils of lithium ion batteries
  • Sizing agents for external coatings of positive and negative electrode coils of lithium ion batteries

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Embodiment Construction

[0021] The present invention will be further described below according to specific embodiments.

[0022] The slurry used for coating on the positive and negative coils of lithium-ion batteries, due to the difference in polarity, the slurry needs to be prepared separately. The surface coating is made of hard carbon. This embodiment is equipped with a 10Ah lithium-ion battery, and the layer density of the activated carbon after curing is required to be 2-20 mg / cm 2 , the solidified hard carbon layer density is 2~16mg / cm 2 . Now according to the supporting requirements, the corresponding components of activated carbon and hard carbon slurries are prepared respectively. The specific components are measured by mass percentage as follows:

[0023] Activated carbon slurry example component table

[0024]

[0025] Hard carbon slurry embodiment component table

[0026]

[0027] The slurries prepared in the above-mentioned embodiments were respectively coated on the surface o...

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Abstract

The invention discloses sizing agents for external coatings of positive and negative electrode coils of lithium ion batteries. The external coatings of the positive electrode coils are made of activated carbon, and the external coatings of the negative electrode coils are made of hard carbon. The activated carbon sizing agent used for coating comprises, by mass, 20-40% of activated carbon, 1.0-10% of conductive agents, 1.0-5.0% of binders and 50-78% of solvent. The hard carbon sizing agent for coating comprises, by mass, 35-55% of hard carbon, 2.0-10% of conductive agents, 1.0-15% of binders and 30-60% of solvent. Compared with batteries with the same specifications in the prior art, the lithium ion batteries with the sizing agents have the advantages that the performance is much better, battery recycling service life is particularly prolonged by more than 10 times, and momentary ultrahigh rate discharge indexes can be doubled.

Description

technical field [0001] The invention belongs to the technical field of surface coating of metal components. Specifically, the invention relates to a coating slurry, especially a slurry used for external coating of positive and negative electrode rolls of lithium ion batteries. Background technique [0002] The base material for making positive and negative pole rolls of lithium-ion batteries is metal foil. A slurry composed of positive electrode active material, conductive agent, binder and solvent is coated on a fixed-length aluminum foil, and after drying, a positive electrode roll with an external coating is formed; in addition, coated on a fixed-length copper foil Cover the slurry composed of negative electrode active material, conductive agent, binder and solvent, and form the negative electrode roll with external coating after drying. Positive and negative pole rolls are raw materials for making positive and negative pole pieces of lithium-ion batteries. The quality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/02H01M10/0525
CPCH01M4/02H01M4/583H01M4/62H01M4/621H01M4/624H01M10/0525Y02E60/10
Inventor 孙全司晓影程传捷王丽芳徐斌
Owner JIANGSU FRONT NEW ENERGY
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