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Coating of lithium ion battery positive plate, coating preparation method and positive plate

A lithium-ion battery, positive electrode technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor flexibility and poor conductivity, and achieve good flexibility, good conductivity, and a wide range of sources. Effect

Active Publication Date: 2010-07-07
SHENZHEN CHAM BATTERY TECHNOLOGY CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a coating for the positive pole piece of lithium-ion batteries, aiming to solve the problems of weak electrical conductivity and poor softness in existing coatings

Method used

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Embodiment Construction

[0035] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0036] The invention provides a kind of coating of lithium-ion battery positive pole piece, comprises the component of following weight percent:

[0037] Positive electrode active material 90%~97%

[0038] Acetylene black 0.5%~2%

[0039] Flake graphite 0.5%~1.5%

[0040] Ketjen Black 0.5%~1.5%

[0041] PVDF (polyvinylidene fluoride) 1.5% to 5%.

[0042] In the above coating, the positive electrode active material can be one or more of lithium cobaltate, nickel-cobalt-manganese ternary material, lithium manganate, lithium ferrous phosphate or other positive electrode active materials. In this embodiment, the The positi...

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Abstract

The invention is suitable for the field of battery manufacture and provides a coating of a lithium ion battery positive plate. The coating contains the solid matter in weight percent: 90 to 97 percent of anode active substance, 0.5 to 2 percent of acetylene black, 0.5 to 1.5 percent of crystalline flake graphite, 0.5 to 1.5 percent of Ketjen black and 1.5 to 5 percent of PVDF. After the technical scheme is adopted, due to the application of the acetylene black, the crystalline flake graphite and the electrocarbon black, the electrical conductivity and the flexibility of the positive plate are obviously improved, thereby being beneficial to the utilization of battery capacity and prolonging the service life of the battery.

Description

technical field [0001] The invention belongs to the field of battery manufacture, and in particular relates to a coating for a lithium-ion battery positive pole piece, a manufacturing method of the coating and a positive pole piece containing the coating. Background technique [0002] The existing lithium-ion battery positive electrode sheet is generally made by first coating the electrode slurry on the aluminum foil, drying the aluminum foil, and then cutting the aluminum foil. Adding a conductive agent to the electrode slurry can greatly improve the conductivity of the positive electrode sheet. There are many options for the types and dosage combinations of the above-mentioned conductive agents, and the conductive properties obtained by different types and dosage combinations are quite different. [0003] At present, many batteries on the market have a 1C cycle (DOD100%) internal resistance change of 20mΩ or more in 300 weeks, and it is difficult to guarantee the long-ter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/58H01M4/139H01M4/131H01M4/136
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 席永全程建良
Owner SHENZHEN CHAM BATTERY TECHNOLOGY CO LTD
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