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Positive electrode pole piece and preparation method and purpose thereof

A technology of positive electrode sheet and positive electrode material, applied in the direction of electrode manufacturing, battery electrode, electrode collector coating, etc., can solve the problems of low energy density of positive electrode sheet and low energy density of lithium ion battery, and achieve excellent cycle stability Sexuality, promotion of rapid transfer, high conductivity

Active Publication Date: 2019-03-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy density of the positive electrode sheet prepared by the method is low, and the energy density of the obtained lithium ion battery is low

Method used

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  • Positive electrode pole piece and preparation method and purpose thereof
  • Positive electrode pole piece and preparation method and purpose thereof
  • Positive electrode pole piece and preparation method and purpose thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A method for preparing a positive pole piece comprises the steps of:

[0060] (1) Mix lithium nickel cobalt aluminate, CNTs and PVDF at a mass ratio of 97:2:1, add N-methylpyrrolidone to adjust the viscosity to 4587mPa·s, and obtain the first electrode slurry;

[0061] (2) Mix lithium nickel cobalt aluminate, conductive carbon black SP and PVDF at a mass ratio of 97:2:1, add N-methylpyrrolidone to adjust the viscosity to 4587mPa·s, and obtain the second electrode slurry;

[0062] (3) Coating the first electrode slurry on a 10 μm aluminum foil to obtain the first coating layer, drying the first coating layer at 80° C. for 6 h, and then coating the second electrode slurry on the dried On the first coating layer, obtain the second coating layer, and finally carry out rolling, and the density of rolling is 3.5mg / cm 3 , dried at 120°C for 12 hours, and the areal density of the first electrode material layer was 14 mg / cm 2 , the areal density of the second electrode materia...

Embodiment 2

[0064] The difference from Example 1 is that the conductive carbon black SP in step (2) is replaced by Ketjen black.

Embodiment 3

[0066] The difference from Example 1 is that the CNTs in step (1) are replaced by Ketjen black.

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Abstract

The invention relates to a positive electrode pole piece comprising a current collector, a first electrode material layer and a second electrode material layer. The first electrode material layer andthe second electrode material layer are arranged at one side of the current collector successively. A conductive agent in the first electrode material layer is a first conductive agent and a conductive agent in the second electrode material layer is a second conductive agent; and the conductivity of the first conductive agent is higher than that of the second conductive agent. According to the invention, different types of conductive agents are set in dual electrode material layers of the positive electrode pole piece and thus a good conductive system is constructed, so that the conductivity of the positive electrode pole piece is improved effectively, the rapid transfer of the charges is promoted, and the electrochemical performance of the battery is enhanced. The energy density of the lithium ion battery including the positive electrode pole piece is high; and the energy density is larger than or equal to 255Wh / kg at a current density of 0.2 C.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a positive pole piece, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high working voltage and long cycle life, and have been developed rapidly since their commercialization. With the widespread application of lithium-ion batteries in the fields of hybrid electric vehicles and new energy vehicles, higher requirements are placed on the energy density of lithium-ion batteries. Under the same conditions, high energy density can effectively increase the cruising range of the vehicle, so improving the energy density of the battery and developing a power-type lithium-ion battery have become the top priority at present. [0003] Starting from the process, major battery manufacturers have increased the energy density by increasing the coating thickness of the battery and the ratio of acti...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M4/62H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M4/621H01M4/624H01M10/0525Y02E60/10
Inventor 张锁江宋开放张兰巫湘坤陈占
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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