Battery electrode, preparation method thereof, and all-solid-state battery

A battery electrode and electrode material technology, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problems of high environmental requirements for lithium powder, low ion conductivity of polymer electrolytes, and poor uniformity of pole pieces. Achieve high ionic conductivity and mechanical strength, improve production/manufacturing efficiency, and reduce manufacturing costs

Active Publication Date: 2019-01-15
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN105680091A discloses a high-performance all-solid-state lithium-ion battery and its preparation method. In this application, the polymer electrolyte modified by lithium superionic conductor runs through the whole all-solid-state lithium-ion battery system, which improves the transmission rate of lithium ions and improves The rate charge and discharge capacity of all solid-state lithium-ion batteries; however, this method has the following major disadvantages: ①The negative electrode sheet preparation process is complicated, and the lithium powder has high environmental requirements; ②The negative electrode needs to mix lithium powder with superionic conductors and polymers , it is difficult to mix evenly, resulting in poor uniformity of the pole piece and poor battery consistency; ③The positive and negative pole pieces need to be soaked in the polymer electrolyte to make the battery. After soaking, the gel polymer electrolyte is bonded to the pole piece, increasing The complexity of the lamination process and the difficulty of correct lamination; ④The ionic conductivity of the polymer electrolyte is low, which is far from the requirements of commercial applications.
However, this method also has the following major disadvantages: ①The preparation process is complicated and there are many steps; ②The ionic conductivity of the polymer PUA and PMMA itself is not high, and the ionic conductivity of the polymer electrolyte membrane is mainly increased by adding ionic liquids. conductivity, and the high cost of ionic liquids is not suitable for industrial production; ③ dibenzoyl peroxide, the initiator used in ultraviolet crosslinking, is extremely unstable, and may cause fire and explosion when exposed to bright light, high temperature and reducing agents. Dangerous, so the risk is higher during operation

Method used

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  • Battery electrode, preparation method thereof, and all-solid-state battery
  • Battery electrode, preparation method thereof, and all-solid-state battery
  • Battery electrode, preparation method thereof, and all-solid-state battery

Examples

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preparation example Construction

[0059] The second aspect of the present invention provides a method for preparing a battery electrode, the method comprising:

[0060] (1) provide an electrode slurry containing electrode active materials, crosslinkable copolymers, crosslinking agents, inorganic nanoparticles modified by silane coupling agents, and photoinitiators;

[0061] (2) Coating the electrode slurry in step (1) on the electrode collector, drying, and then performing cross-linking and curing on the electrode collector to form an electrode material layer under ultraviolet light irradiation;

[0062] Wherein, the crosslinkable copolymer contains the structural unit shown in formula (1), the structural unit shown in formula (2) and the structural unit shown in formula (3);

[0063]

[0064] Wherein, R is H or C1-C4 alkyl, L is C0-C4 alkylene or -R 1 -O-R 2 -, R 1 C0-C4 alkylene, R 2 is C0-C4 alkylene;

[0065] The crosslinking agent is one or more of the acrylate crosslinking agents containing at le...

preparation example 1

[0107] This preparation example is used to illustrate the inorganic nanoparticles modified by silane coupling agent.

[0108] Nano-SiO with a mass ratio of 1:2 2 (purchased from Beijing Deke Daojin Technology Co., Ltd., as particles with a particle size of 30nm) and 3-acryloyloxypropyltrimethoxysilane were added to ethanol (ethanol and nano-SiO 2 The mass ratio is 5:1), followed by ultrasonic dispersion for 30 minutes, and reacting at 100° C. for 12 hours to obtain inorganic nanoparticles modified by silane coupling agent C1.

preparation example 2

[0110] Nano Al 2 o 3 (purchased from Sumitomo Corporation, Japan, as particles with a particle size of 300nm) in hydrochloric acid (concentration is 0.1mol / L) to carry out surface treatment to make nano-Al 2 o 3 With hydroxyl groups on it, and then the surface-treated nano-Al according to the mass ratio of 1:3 2 o 3 with 3-methacryloxypropylethyldiethoxysilane added to isopropanol (isopropanol and nano-SiO 2 The mass ratio is 4:1), followed by ultrasonic dispersion for 35 minutes, and reacted at 110° C. for 10 hours, so as to obtain the inorganic nanoparticles C2 modified by the silane coupling agent.

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Abstract

The invention relates to the field of all-solid-state batteries, in particular to battery electrodes, a preparation method thereof and all-solid-state batteries. The battery electrode comprises an electrode current collector and an electrode material layer attached to the surface thereof, wherein the electrode material layer comprises a polymer matrix and an electrode active material, and the polymer matrix is a nanoparticle modified crosslinked copolymer. The battery electrode and the electrolyte layer provided by the invention have higher ionic conductivity and mechanical strength, so that the battery has better specific capacity, cycle life and the like.

Description

technical field [0001] The invention relates to the field of all-solid-state batteries, in particular to a battery electrode, a preparation method thereof, and an all-solid-state battery. Background technique [0002] At present, most lithium-ion batteries on the market use liquid electrolyte as the conductive substance, but during use, the liquid electrolyte is volatile, flammable and explosive, causing many safety problems; moreover, it is easy to grow lithium dendrites, which limits the Application of lithium as negative electrode in batteries. Therefore, solid polymer electrolytes (SPEs) have been proposed to replace liquid electrolytes. The solid polymer electrolyte membrane not only plays the role of ion conduction, but also prevents the contact of positive and negative electrodes. And because of its strong plasticity, it can be made into films of different shapes according to different needs. It has good flexibility, can withstand the pressure of electrodes during c...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/60H01M10/0525
CPCH01M4/602H01M4/667H01M10/0525Y02E60/10
Inventor 高磊刘荣华李元姣单军
Owner BYD CO LTD
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