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Lithium ion secondary battery positive pole piece and production method thereof

A technology of secondary battery and positive electrode sheet, applied in the direction of secondary battery, battery electrode, circuit, etc., can solve the problems of poor heat dissipation, poor electrode adhesion, poor rate performance, etc. Rate performance and safety performance, and the effect of improving electrical conductivity and heat dissipation

Inactive Publication Date: 2015-07-08
SHENZHEN SHENG ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the positive electrode of lithium-ion secondary batteries on the market uses single carbon nanotubes, which have problems such as poor rate performance, poor heat dissipation, and poor adhesion of the pole pieces.

Method used

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  • Lithium ion secondary battery positive pole piece and production method thereof
  • Lithium ion secondary battery positive pole piece and production method thereof

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Embodiment Construction

[0014] The lithium ion secondary battery cathode sheet of the present invention comprises active material lithium cobaltate or a mixture of lithium cobaltate and lithium manganate, carbon nanotubes, acetylene black, polyvinylidene fluoride binder, and nitrogen methyl pyrrolidone solvent. Wherein, the average particle size of the carbon nanotubes is 1-10 nm. The active material lithium cobaltate or a mixture of lithium cobaltate and lithium manganate, carbon nanotubes, acetylene black, polyvinylidene fluoride binder, and nitrogen methyl pyrrolidone solvent are respectively 94.5:1.5:2:2 according to the mass ratio: 65 formulated. Carbon nanotubes have good heat transfer performance and have a very large aspect ratio, so their heat exchange performance along the length direction is high. Carbon nanotubes are synthesized by pyrolyzing granular polyethylene at 420-450°C and under H2 atmosphere, using metal Ni as a catalyst. Acetylene black is a carbon black obtained by continuous...

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Abstract

The invention relates to the technical field of a lithium ion battery, and particularly relates to a lithium ion secondary battery positive pole piece and a production method thereof. The lithium ion secondary battery positive pole piece comprises active material lithium cobalt oxide or a mixture of lithium cobalt oxide and lithium manganate, a carbon nano-tube, acetylene black, a polyvinylidene fluoride adhesive and an NMP solvent, wherein the mass ratio of the active material lithium cobalt oxide or the mixture of the lithium cobalt oxide to the lithium manganate to the carbon nano-tube to the acetylene black to the polyvinylidene fluoride adhesive to the NMP solvent is 94.5: 1.5: 2: 2: 65. According to a positive pole formula, two conducting agents (carbon nano-tube and acetylene black) are added, and the extraction and insertion speed of lithium ions in a positive pole material can be increased by utilizing the synergistic effect of the tubular structure of the carbon nano-tube and the spotted conducting structure of the acetylene black, so that the gram volume of a battery main material and the rate discharge of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode sheet of a lithium ion secondary battery and a manufacturing method thereof. Background technique [0002] The positive and negative electrode materials of lithium-ion secondary batteries usually have a hierarchical structure or a network structure, or a substance with a tunnel structure. In this special structure, lithium ions are allowed to enter and exit, and only the corresponding expansion and contraction occur, while the material There is no irreversible change in structure. The positive and negative electrodes of this battery are made of materials that can freely intercalate and detach lithium ions. When charging, the lithium atoms in the positive electrode are ionized into lithium ions and electrons are deintercalated from the crystal lattice to obtain lithium ions with external input energy. The negative electrode migrates, and lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/62H01M10/0525
CPCH01M4/131H01M4/1391H01M4/62H01M4/623H01M10/0525Y02E60/10
Inventor 彭卓刘恩新
Owner SHENZHEN SHENG ENERGY TECH CO LTD
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