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Battery negative electrode, preparation method thereof and secondary battery

A battery negative electrode and conductive layer technology, applied to battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as battery cycle instability, achieve the effects of inhibiting volume expansion, preventing erosion and reaction, and enhancing electrical conductivity

Active Publication Date: 2020-04-10
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a battery negative electrode and its preparation method and secondary battery, aiming to solve the problem of unstable battery cycle due to expansion of the negative electrode material when metal is used as the negative electrode material in the prior art

Method used

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  • Battery negative electrode, preparation method thereof and secondary battery
  • Battery negative electrode, preparation method thereof and secondary battery
  • Battery negative electrode, preparation method thereof and secondary battery

Examples

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preparation example Construction

[0033] The above-mentioned negative electrode of the battery is prepared by the following preparation method of the negative electrode of the battery.

[0034] Correspondingly, the embodiment of the present invention also provides a method for preparing a negative electrode of a battery. The method comprises the steps of:

[0035] S01. placing the metal substrate in the cationic polymer solution for soaking reaction, so that the cationic polymer in the cationic polymer solution is combined on the surface of the metal substrate to form a cationic polymer layer to prepare a crude product;

[0036] S02. Place the crude product in the conductive solution for soaking reaction, make the conductive material in the conductive solution bond to the surface of the cationic polymer layer to form a conductive layer, and prepare the negative electrode of the battery.

[0037] Specifically, in the above step S01, the cationic polymer of the cationic polymer solution is selected from at leas...

Embodiment 1

[0057] Preparation of battery negative electrode

[0058] Select aluminum foil as the metal substrate, cut the aluminum foil to obtain a disc with a diameter of 12mm; place the cut substrate in absolute ethanol for ten minutes of ultrasonic cleaning, repeat the above steps three times to ensure that the substrate is clean; use nitrogen as the inert In a gas atmosphere, the surface-cleaned substrate is dried in the nitrogen atmosphere.

[0059] Configure the cationic polymer solution: select polydiallyldimethylammonium chloride as the cationic polymer, configure a cationic polymer solution with a volume percentage concentration of 1%, and its preparation method is as follows: measure 1mL PDDA and dissolve it in 100mL water, Stir to make it mix uniformly to obtain a cationic polymer solution with a concentration of 1% by volume;

[0060] Configure conductive solution: choose graphite oxide as the conductive material, and configure a conductive solution with a concentration of 1...

Embodiment 2

[0066] Compared with Example 1, "choose graphite oxide as the conductive material" was replaced with "choose oxidized carbon nanotubes as the conductive material"; other steps were the same as in Example 1 to prepare the negative electrode of the battery and the secondary battery.

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Abstract

The invention provides a battery negative electrode. The battery negative electrode comprises a metal base material, a cationic polymer layer combined on at least one surface of the metal base material, and a conductive layer combined on the surface, deviating from the metal base material, of the cationic polymer layer, wherein the surface of the conductive layer is negatively charged, and the conductive layer is combined with the cationic polymer layer through electrostatic interaction. The battery negative electrode can inhibit the volume expansion of the negative electrode metal base material, inhibit the pulverization of the negative electrode material and ensure the integrity of the negative electrode metal base material; meanwhile, the contact between the electrolyte and the negativeelectrode metal material can be effectively isolated, the negative electrode metal material is prevented from being eroded and reacted, and a more stable SEI film is favorably formed; the conductivelayer with conductivity is combined with the outermost layer, so that the conductivity can be further enhanced, and the cycling stability of the battery is improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a battery negative electrode, a preparation method thereof, and a secondary battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high energy efficiency, long cycle life, no memory effect, fast discharge, etc., so they have huge markets in consumer electronics and electric vehicles, power grid peak regulation, energy storage power supplies, aerospace and other fields need. In order to meet the current performance, cost and environmental challenges faced by lithium-ion batteries, the development of electrode materials with abundant reserves, low cost and easy availability, and excellent electrochemical performance is the current research and development direction. [0003] Traditional lithium-ion batteries are mainly composed of positive and negative electrode materials, separators, electrolytes, current collectors and other main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/60
CPCH01M4/604H01M4/661H01M4/667Y02E60/10
Inventor 唐永炳王海涛王琛
Owner SHENZHEN INST OF ADVANCED TECH
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