Manganese-based lithium-rich oxide positive electrode material, preparation method thereof, and electrochemical device applying manganese-based lithium-rich oxide positive electrode material

A positive electrode material, manganese-based lithium-rich technology, applied in the direction of electrochemical generators, circuits, electrical components, etc., can solve the problems of long reaction time and heat treatment time, shedding, complex process, etc., to improve the lithium ion diffusion capacity and rate Performance, prevention of falling off or damage, effect of reducing interface stress

Pending Publication Date: 2021-01-29
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing coating process is to attach a layer of material with a spinel structure on the surface of the electrode material. This coating layer is not only difficult to control its uniformity and thickness, but also may fall off during the charge-discharge cycle. , failure
In addition, the surface coating process is complex and difficult to apply to large-scale production
In the CN107215900B patent, the patentee adds lithium-rich manganese-based positive electrode materials to weak acids such as ammonium dihydrogen phosphate, and through Li + / H + Lithium-rich manganese-based oxide cathode materials containing spinel on the surface are obtained by heat treatment after ion exchange reaction. However, this method requires harsh acidity detection methods and long reaction time and heat treatment time.

Method used

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  • Manganese-based lithium-rich oxide positive electrode material, preparation method thereof, and electrochemical device applying manganese-based lithium-rich oxide positive electrode material
  • Manganese-based lithium-rich oxide positive electrode material, preparation method thereof, and electrochemical device applying manganese-based lithium-rich oxide positive electrode material
  • Manganese-based lithium-rich oxide positive electrode material, preparation method thereof, and electrochemical device applying manganese-based lithium-rich oxide positive electrode material

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preparation example Construction

[0050] A method for preparing a manganese-based lithium-rich oxide cathode material, comprising the steps of:

[0051] Step S1: providing a manganese-based lithium-rich oxide material.

[0052] In one embodiment, the chemical formula of the manganese-based lithium-rich oxide material is as follows: xLi 2 MnO 3 ·(1-x)LiTM y m (1-y) o 2 , 0<x<1, 0.9<Y<1, wherein TM mainly includes at least one of Ni, Co, and Mn, and M is at least one of Al, Fe, Mg, and Ti.

[0053] In an embodiment, the manganese-based lithium-rich oxide material may be a layered manganese-based lithium-rich oxide material.

[0054] Step S2: Mix the manganese-based lithium-rich oxide material with water or an aqueous solution containing highly oxidizing substances and add it into a closed container, stir evenly and heat-treat at a temperature range greater than 100° C. for 0.5 to 10 hours to obtain pretreatment mixture, wherein the water can be neutral water.

[0055] In one embodiment, the lithium ions (...

Embodiment 1

[0070] Add 1g of manganese-based lithium-rich oxide material to 35mL of deionized water, then stir, put the solid-liquid suspension into a closed high-temperature reaction kettle, and heat at 150°C for 10 hours to make the manganese-based lithium-rich oxide material A lithium-poor layer is formed on the surface layer, and a pretreatment mixture is obtained. Solid-liquid separation was performed on the pretreatment mixture to obtain the solid pretreatment, and the pretreatment was placed in an oven and dried at a temperature of 80° C. for 2 hours. Then the dried pre-treated material was put into a muffle furnace at 500°C for calcination for 3 hours to convert the layered lithium-poor layer on the surface of the pre-treated material into a spinel structure, and waited for the temperature of the muffle furnace to drop to room temperature before taking it out. A layered manganese-based lithium-rich oxide cathode material with a spinel phase heterogeneous layer on the surface is ob...

Embodiment 2

[0072] Add 0.5g of manganese-based lithium-rich oxide material to 35mL of deionized water, then stir, put the solid-liquid suspension into a closed high-temperature reactor, and heat at 150°C for 10 hours to make the manganese-based lithium-rich oxide material A lithium-poor layer is formed on the surface layer, and a pretreatment mixture is obtained. Solid-liquid separation was performed on the pretreatment mixture to obtain the solid pretreatment, and the pretreatment was placed in an oven and dried at a temperature of 80° C. for 2 hours. Then the dried pre-treated material was put into a muffle furnace at 500°C for calcination for 3 hours to convert the layered lithium-poor layer on the surface of the pre-treated material into a spinel structure, and waited for the temperature of the muffle furnace to drop to room temperature before taking it out. A layered manganese-based lithium-rich oxide cathode material with a spinel phase heterogeneous layer on the surface is obtained...

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Abstract

The invention provides a preparation method of a manganese-based lithium-rich oxide positive electrode material. The preparation method comprises the following steps: providing a manganese-based lithium-rich oxide material; mixing the manganese-based lithium-rich oxide material with neutral water or a high-oxidability aqueous solution, adding the obtained mixture into a closed container, uniformlystirring, and carrying out heat treatment for 0.5-10 hours at the temperature of more than 100 DEG C, so as to obtain a pretreatment substance mixed solution; carrying out solid-liquid separation onthe pretreatment substance mixed solution to obtain a pretreatment substance; and carrying out heat treatment on the pretreatment substance at the temperature of 100-600 DEG C for at least 30 minutesto obtain the manganese-based lithium-rich oxide positive electrode material. The invention also provides the manganese-based lithium-rich oxide positive electrode material and an electrochemical device using the same.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a manganese-based lithium-rich oxide cathode material, a preparation method thereof, and an electrochemical device using the same. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, less self-discharge, long cycle life and environmental friendliness. They are the main development direction of clean energy development in the 21st century. They have been widely used in mobile electronic devices, electric vehicles and other large energy storage devices. middle. However, due to the development of electric vehicles, people's requirements for higher mileage and faster charging rates are increasing. The core components of a lithium-ion battery mainly include four parts: positive electrode material, negative electrode material, electrolyte, and diaphragm. Among them, the energy and power density of the positive electrode materia...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 涂文强李宝华王贤树周宇楠
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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