Composite coated positive electrode active material and preparation method thereof, lithium ion battery positive electrode material and solid lithium ion battery

A positive electrode active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery cycle stability and poor rate performance, achieve inhibition of dissolution and phase transition, avoid element diffusion, improve The effect of structural stability

Active Publication Date: 2020-12-25
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the objectives of the present invention is to provide a composite coated positive electrode active material to improve the technical problems of poor cycle stability and rate performance of the battery when a solid state battery system is formed by using a sulfide solid electrolyte and an existing positive electrode active material

Method used

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  • Composite coated positive electrode active material and preparation method thereof, lithium ion battery positive electrode material and solid lithium ion battery
  • Composite coated positive electrode active material and preparation method thereof, lithium ion battery positive electrode material and solid lithium ion battery

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preparation example Construction

[0039] According to a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned composite coated positive electrode active material, comprising the steps of:

[0040] The titanium alkoxide, graphene oxide and positive electrode active material are uniformly mixed in a solvent, and hydrolysis and solvothermal reaction are carried out to obtain a composite coated positive electrode active material.

[0041] The preparation method of the composite coating positive electrode active material provided by the present invention is to obtain the composite coating positive electrode active material by mixing titanium alkoxide, graphene oxide and positive electrode active material and then performing hydrothermal and solution thermal reactions. The process is simple and the coating Uniform, suitable for large-scale production.

[0042] In a preferred embodiment of the present invention, the titanium alkoxide and graphene oxide are f...

Embodiment 1

[0068] The present embodiment provides a composite coated positive electrode active material, which includes lithium nickel cobalt manganese oxide, titanium dioxide and graphene, and the mass ratio of the three is 92:7:1, the thickness of the composite material layer is 50nm, and its specific structure The surface of nickel cobalt lithium manganate is coated with a composite material layer, the composite material layer includes titanium dioxide and graphene, and titanium dioxide is grown on the sheet of graphene in situ;

[0069] The preparation method of the composite coated positive electrode active material comprises the following steps:

[0070] (1) Weigh 50mg of polyethylene glycol, dissolve it in 20mL (concentration 95%) ethanol solution under the condition of 70°C water bath, then add 0.2g graphene oxide for ultrasonic dispersion for 1h, measure 3mL (relative density 0.996g / mL) of tetrabutyl titanate and 1 mL (99.8% purity) of acetylacetone were added to a beaker, and ...

Embodiment 2

[0073] This embodiment provides a composite coated positive electrode active material, the structure of which is the same as that of the composite coated positive electrode active material provided in Example 1, except that the mass ratio of nickel cobalt lithium manganate, titanium dioxide and graphene is 99% :0.5:0.5, the composite layer thickness is 5nm;

[0074] The preparation method of the composite coated positive electrode active material provided in this example is the same as that of Example 1, except that the amount of raw materials is different, wherein the amount of nickel-cobalt lithium manganese oxide is 9.9g, and the amount of tetrabutyl titanate is 0.25mL (relative density 0.996g / mL), the amount of graphene oxide is 0.1g.

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Abstract

The invention provides a composite coated positive electrode active material, a preparation method thereof, a lithium ion battery and a solid state lithium ion battery and relates to the technical field of battery materials. The composite coated positive electrode active material comprises a positive electrode active material and a composite material layer coating the positive electrode active material, wherein the composite material layer is composed of titanium dioxide and graphene, and the titanium dioxide in situ grows on the sheets of the graphene. The composite coated positive electrodeactive material can solve the problems of poor circulating stability and low rate capability of a solid state battery system composed of sulfide solid electrolytes and existing positive electrode active materials. The composite coated positive electrode active material is not only high in conductivity, but capable of isolating the interfacial contact between the positive electrode active materialsand the sulfide solid electrolytes, improving the stability of the positive electrode active materials and further effectively improving the circulating performance and the rate capability of the solid state lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a composite coating positive electrode active material and a preparation method thereof, a lithium ion battery positive electrode material and a solid lithium ion battery. Background technique [0002] Although the organic liquid electrolyte used in traditional lithium-ion batteries has the advantages of high ionic conductivity, good electrode / electrolyte interface compatibility, and easy processing, it is prone to volatilization, leakage, flammability, and explosion during use. and other security issues. In addition, the lower electrochemical window cannot be used in batteries with high-voltage systems, and the use of inorganic solid-state electrolytes with high ionic conductivity is expected to improve battery safety and achieve high energy density. [0003] Inorganic solid electrolytes mainly include oxide solid electrolytes and sulfide solid electrolytes. Since the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 倪海芳陈渊周美丽
Owner 桑德新能源技术开发有限公司
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