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Positive plate containing strip-shaped graphene conductive agent and lithium ion battery

A technology of graphene and conductive agent, which is applied in the direction of non-aqueous electrolyte battery electrodes, positive electrodes, battery electrodes, etc., can solve the problems of reduced effective contact area, increased difficulty of lithium ion deintercalation, lithium ion transmission obstacles, etc., to eliminate The negative impact of ionic conductivity, the effect of improving battery rate and cycle performance, and excellent electronic conductivity

Active Publication Date: 2021-09-07
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the conventional sheet-shaped graphene is more difficult to disperse in the solvent, and it is easier to agglomerate together, resulting in a decrease in the effective contact area between graphene and lithium ions, making it difficult to deintercalate lithium ions, and the large sheet-like shape of graphene , so that lithium ions cannot traverse horizontally, and need to bypass the graphene sheet, so the transmission path is greatly increased, which is not conducive to the diffusion of lithium ions, that is, the transmission of lithium ions is hindered, resulting in increased internal resistance of the battery cell and accelerated battery failure.
In addition, the repeated deintercalation of lithium ions makes the graphene sheet structure more dense, and the difficulty of deintercalation of lithium ions increases, which reduces the cycle capacity.
The "surface-point" contact between graphene and cathode materials has high electronic conductivity but poor ion channels, which adversely affects the rate performance of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Clean the metal copper foil, then curl the copper foil and put it into the tube furnace, pass in the nitrogen protective gas, heat to 800-1000°C, keep the stable temperature for 20 minutes, stop feeding the protective gas, and start from the tube furnace The mixed gas of methane and hydrogen is fed into the furnace at both ends of the furnace at the same time. The flow ratio of methane and hydrogen is 9:1. After reacting for 15 minutes, adjust the flow ratio of methane and hydrogen to 4:1 and continue the reaction for 15 minutes. Close the methane and hydrogen channels, feed nitrogen to remove excess methane and hydrogen until the tube cools down, take out the metal copper foil, separate the graphene and copper foil substrate by chemical etching, and obtain strip graphene with a length of 100 -3000nm, thickness 0.4-4.3nm, width 5-50nm.

[0021] The strip graphene as a raw material is obtained by washing, centrifuging, standing and drying, and the length is 100-1000nm, t...

Embodiment 2

[0023] Clean the metal copper foil, then curl the copper foil and put it into the tube furnace, pass in the nitrogen protective gas, heat to 800-1000°C, keep the stable temperature for 20 minutes, stop feeding the protective gas, and start from the tube furnace The mixed gas of methane and hydrogen is fed into the furnace at both ends of the furnace at the same time. The flow ratio of methane and hydrogen is 9:1. After reacting for 15 minutes, adjust the flow ratio of methane and hydrogen to 4:1 and continue the reaction for 15 minutes. Close the methane and hydrogen channels, feed nitrogen to remove excess methane and hydrogen until the tube cools down, take out the metal copper foil, separate the graphene and copper foil substrate by chemical etching, and obtain strip graphene with a length of 100 -3000nm, thickness 0.4-4.3nm, width 5-50nm.

[0024] The strip graphene as a raw material is obtained by washing, centrifuging, standing and drying, and the length is 100-1000nm, t...

Embodiment 3

[0026]Clean the metal copper foil, then curl the copper foil and put it into the tube furnace, pass in the nitrogen protective gas, heat to 800-1000°C, keep the stable temperature for 20 minutes, stop feeding the protective gas, and start from the tube furnace The mixed gas of methane and hydrogen is fed into the furnace at both ends of the furnace at the same time. The flow ratio of methane and hydrogen is 9:1. After reacting for 15 minutes, adjust the flow ratio of methane and hydrogen to 4:1 and continue the reaction for 15 minutes. Close the methane and hydrogen channels, feed nitrogen to remove excess methane and hydrogen until the tube cools down, take out the metal copper foil, separate the graphene and copper foil substrate by chemical etching, and obtain strip graphene with a length of 100 -3000nm, thickness 0.4-4.3nm, width 5-50nm.

[0027] The strip graphene as a raw material is obtained by washing, centrifuging, standing and drying, and the length is 100-1000nm, th...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a conductive agent containing strip-shaped graphene. The conductive agent is a strip-shaped graphene conductive agent or a composite conductive agent formed by mixing strip-shaped graphene with at least one of carbon black, carbon nanotubes and graphite. The positive plate containing the strip-shaped graphene conductive agent comprises a positive current collector, wherein the surface of the positive current collector is coated with positive slurry, the positive slurry comprises a positive active material, a conductive agent and a binder, and the conductive agent comprises the strip-shaped graphene. The invention also discloses a lithium ion battery containing the strip-shaped graphene conductive agent. The lithium ion battery comprises the positive plate containing the strip-shaped graphene conductive agent. The negative influence of the graphene conductive agent in the lithium battery on the ionic conductivity can be effectively eliminated, the internal resistance of the lithium ion battery is reduced, and the rate and cycle performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode sheet containing a strip graphene conductive agent and a lithium ion battery. Background technique [0002] With the application in the field of high-performance power batteries, the requirements for high-rate performance of lithium-ion batteries are getting higher and higher. However, the poor conductivity of the cathode material of the lithium battery leads to a large internal resistance of the battery, poor rate performance, voltage platform and high and low temperature performance, which severely limits the power performance of the lithium-ion battery. At present, the main solution is to add a larger amount of conductive agents with higher electronic conductivity, such as graphene, carbon black, carbon fiber, carbon nanotubes, etc., used alone or in combination. [0003] The application number CN201611217756.7, the Chinese patent published ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/625H01M4/13H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 颜立清王军华
Owner WANXIANG 123 CO LTD
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