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Composite conductive agent, lithium ion battery positive electrode and lithium ion battery

A technology of composite conductive agent and lithium-ion battery, which is applied in battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve problems such as the inability to effectively reduce the DC internal resistance of ternary batteries, and achieve improved overcharge performance, distribution Ratio is reasonable, the effect of improving electronic conductivity and ion conductivity

Inactive Publication Date: 2018-07-06
CHINA AVIATION LITHIUM BATTERY LUOYANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a composite conductive agent, thereby solving the problem that the existing conductive agent cannot effectively reduce the DC internal resistance of the ternary battery

Method used

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  • Composite conductive agent, lithium ion battery positive electrode and lithium ion battery
  • Composite conductive agent, lithium ion battery positive electrode and lithium ion battery
  • Composite conductive agent, lithium ion battery positive electrode and lithium ion battery

Examples

Experimental program
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Embodiment 1

[0032] The positive electrode of the lithium ion battery of this embodiment includes copper foil and electrode material layers coated on both sides of the copper foil, the electrode material layer is composed of a positive electrode active material, a binder and a composite conductive agent, and the positive electrode active material is three Element material (LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 ) and lithium manganese iron phosphate, the binder is PVDF, the composite conductive agent is conductive agent SP, KS6 and carbon nanotubes, and the weight ratio of each component is ternary material: lithium manganese iron phosphate: PVDF: conductive agent SP: KS6 : carbon nanotubes = 80: 14: 2.0: 1.7: 1.5: 0.8.

[0033] The preparation method of the positive electrode of lithium ion battery in this embodiment adopts the following steps: mix NMP solvent and PVDF to prepare binder solution, add carbon nanotubes to the binder solution and mix evenly, then add conductive agent SP, KS6 and mix ...

Embodiment 2

[0038] The positive electrode of the lithium ion battery of this embodiment is made up of positive electrode active material, binding agent and composite conductive agent, and positive electrode active material is ternary material (LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 ) and lithium manganese iron phosphate, the binder is PVDF, the composite conductive agent is conductive agent SP, KS6 and carbon nanotubes, and the weight ratio of each component is ternary material: lithium manganese iron phosphate: PVDF: conductive agent SP: KS6 : carbon nanotubes = 84.6: 9.4: 1.9: 1.5: 1.9: 0.7.

[0039]The lithium-ion battery of this embodiment adopts the positive electrode of this embodiment, and then refers to the method of Example 1 to manufacture a lithium-ion battery.

Embodiment 3

[0041] The positive electrode of the lithium ion battery of this embodiment is made up of positive electrode active material, binding agent and composite conductive agent, and positive electrode active material is ternary material (LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 ) and lithium manganese iron phosphate, the binder is PVDF, the composite conductive agent is conductive agent SP, KS6 and carbon nanotubes, and the weight ratio of each component is ternary material: lithium manganese iron phosphate: PVDF: conductive agent SP: KS6 : carbon nanotubes = 75.2: 18.8: 2.4: 1.5: 1.4: 0.7.

[0042] The lithium-ion battery of this embodiment adopts the positive electrode of this embodiment, and then refers to the method of Example 1 to manufacture a lithium-ion battery.

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Abstract

The invention relates to a composite conductive agent, a lithium ion battery positive electrode and a lithium ion battery. The composite conductive agent consists of conductive carbon black, conductive graphite and a carbon nano tube according to the weight ratio of (1.5-2.0):(1.4-2.0):(0.7-1.0). According to the composite conductive agent provided by the invention, the conductive carbon black isrelatively small in particle size and belongs to a dot-shaped conductive agent; the carbon nano tube is provided with a linear structure and belongs to a linear conductive agent; the conductive graphite is of a laminated structure and belongs to a planar conductive agent; through the organic combination of three different dimensions of conductive agents in a ternary battery, the advantages of allthe conductive agents can be comprehensively utilized, a synergetic coupling effect is fully played, the direct-current internal resistance is reduced in multiple aspects of improving the compaction,promoting the dispersion, constructing a conductive network, improving the ionic and electronic conductivity and the like, and finally, the purpose of optimizing the overcharge performance of the ternary battery is realized.

Description

technical field [0001] The invention belongs to the field of additives for lithium-ion battery electrode materials, and in particular relates to a composite conductive agent, a positive electrode of a lithium-ion battery and a lithium-ion battery. Background technique [0002] At present, ternary cathode material batteries (ie, ternary batteries) are more and more widely used in power batteries and other fields due to their characteristics of high gram capacity, high voltage, high energy density, high compaction density, and low cost. The main disadvantage of the ternary battery is its poor overcharge performance. How to reduce the DC internal resistance of the battery, thereby reducing the impedance value, plays an important role in improving the overcharge performance of the ternary battery. [0003] For the positive electrode material, its electronic conductivity and ionic conductivity are quite different from those of the negative electrode. Improving the conductivity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/42H01M4/583H01M10/0525H01M4/66
CPCH01M4/583H01M4/621H01M4/625H01M4/667H01M10/0525H01M10/4235Y02E60/10
Inventor 杨超董鹏远潘美泽王赞霞张要军刘吉云
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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