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A kind of all-solid-state lithium-ion battery composite electrode material and its preparation method and all-solid-state lithium-ion battery

A lithium-ion battery, electrode material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of low durability and cycle performance, low battery output power, etc., and achieve good durability and cycle. The effect of performance, high output power, good durability

Active Publication Date: 2016-08-10
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a common problem in the application of sulfide solid electrolytes, that is, at the electrode / solid electrolyte interface, sulfide solid electrolytes with chalcogen elements represented by cross-linked sulfur are easy to react with electrode active materials and decompose, thus forming space The charge layer, which forms a high resistance to the movement of lithium ions at the interface between the electrode / solid electrolyte, resulting in a battery with lower output power, lower durability and cycle performance

Method used

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  • A kind of all-solid-state lithium-ion battery composite electrode material and its preparation method and all-solid-state lithium-ion battery

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preparation example Construction

[0055] In a second aspect, an embodiment of the present invention provides a method for preparing a composite electrode material for an all-solid lithium ion battery, comprising the following steps:

[0056] In parts by weight, take 0.1-20 parts of polymer monomers, 0.1-50 parts of ethylene glycol derivatives, 0.1-10 parts of lithium salts, 0.1-10 parts of polymerization initiators and 50-99.9 parts of plasticizers to prepare To obtain a mixed solution, the polymer monomer is selected from one or more of fluoropolymer monomers, ether polymer monomers, acrylic polymer monomers and acrylonitrile polymer monomers;

[0057] The mixed solution is arranged on the surface of the electrode active material by electrospinning method, electroblown spinning method, liquid phase spraying method or printing method, and the electrode active material is a positive electrode active material or a negative electrode active material, followed by thermal polymerization , electron beam polymerizati...

Embodiment 1

[0076] A preparation method of a composite electrode material for an all-solid-state lithium ion battery, comprising the following steps:

[0077] (1) In parts by weight, take 15 parts of vinylidene fluoride, 20 parts of ethylene glycol monomethacrylate, and 10 parts of lithium tetrafluoroborate LiBF 4 , 5 parts of azobisisobutyronitrile and 50 parts of propylene carbonate were prepared to obtain a mixed solution;

[0078] (2) Connect the mixed solution to the stainless steel needle through a catheter, and spray the mixed solution through the needle at a flow rate of 0.4ml / h, use the electrode active material as the collector, and the vertical distance from the needle is 15cm, and ground at the same time, the The needle tube is connected to a high-voltage generator, and the voltage is adjusted to 15v, that is, the mixed solution is arranged on the surface of the electrode active material by electrospinning, and the electrode active material is lithium cobaltate;

[0079] Then...

Embodiment 2

[0085] A preparation method of a composite electrode material for an all-solid-state lithium ion battery, comprising the following steps:

[0086] (1) In parts by weight, take 15 parts of ethylene oxide, 0.1 part of ethylene glycol dimethacrylate, and 0.1 part of lithium hexafluorophosphate LiPF 6 , 10 parts of benzoyl peroxide, 50 parts of dimethyl carbonate and 0.1 parts of nano-SiO 2 , to prepare a mixed solution;

[0087] (2) The mixed solution is spun with a spinneret with an air nozzle, and the spinning pressure is 5.88×10 5 Pa, the voltage is DC 50kV, that is, the mixed solution is arranged on the surface of the electrode active material by electro-blowing spinning, and the electrode active material is lithium iron phosphate;

[0088] Then volatilize the solvent in the drying oven, initiate polymerization (110W, λ=375nm) under the irradiation of ultraviolet lamp, and the curing temperature is 25°C, that is to form a coating with a thickness of 1000nm on the surface of...

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Abstract

Embodiment of the present invention provides a solid-state lithium ion battery electrode composite material comprising an electrode active material and a coating layer provided on the surface of the electrode active material, wherein the material of the coating layer comprising by weight: polymer formed of 0.1-20 parts of polymer monomer and 0.1-50 parts of ethylene glycol derivative, 0.1 to 10 parts of lithium salt, 0.1 to 10 parts of a polymerization initiator, 50 to 99.9 parts of a plasticizer, wherein the polymer monomer is selected from one or several monomers of fluorine-containing polymer monomer, ether polymer monomer, acrylic polymer monomer and acrylonitrile polymer monomer. The coating layer can effectively suppress the formation of space charge layer; reduce interface resistance of the solid-state lithium ion battery, thereby improving solid-state battery cycle stability and durability. Embodiments of the present invention also provide a preparation method of the solid-state lithium ion battery electrode material composite, and solid-state lithium-ion batteries comprising the composite electrode material.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an all-solid-state lithium-ion battery composite electrode material, a preparation method thereof, and an all-solid-state lithium-ion battery. Background technique [0002] Since the 1990s, among many alternative energy products, lithium-ion batteries have attracted people's close attention due to their high energy density, good cycle performance, and no memory effect. [0003] In recent years, with the increasing demand for battery applications for electric vehicles and large stationary equipment, all-solid-state lithium-ion batteries with safety and long life have begun to attract attention. They use non-combustible solid inorganic substances as electrolytes, not only have high Energy density, and at the same time has the advantages of good safety and stability, simple installation device, and low manufacturing cost. [0004] At present, most of the inorganic solid-state e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/42H01M10/0525
CPCH01M4/13H01M4/139H01M4/366H01M4/62H01M10/0525Y02E60/10
Inventor 裴佳宁
Owner HUAWEI TECH CO LTD
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