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Method for preparing spinel type lithium manganate coated with metal oxide

A type of lithium manganate and oxide technology, which is applied in the field of preparation of metal oxide-coated spinel-type lithium manganate, can solve the problems that the thickness of the coating layer and the uniformity of the active material have a great influence on the performance, and achieve good results. High temperature electrochemical cycle performance, easy operation, and the effect of improving performance

Inactive Publication Date: 2017-05-31
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickness and uniformity of the coating layer have a great influence on the performance of the active material, so it is particularly important to find an effective coating method

Method used

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  • Method for preparing spinel type lithium manganate coated with metal oxide
  • Method for preparing spinel type lithium manganate coated with metal oxide
  • Method for preparing spinel type lithium manganate coated with metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for titanium dioxide-coated spinel lithium manganate, comprising the following steps;

[0029] (1) Add lithium manganate to a certain amount of absolute ethanol, and add 0.2-0.4 mL of concentrated ammonia water, and ultrasonically disperse for 15-30 minutes;

[0030] (2) Measure 1 mL of tetrabutyl titanate, add it to 79 mL of absolute ethanol, and disperse it ultrasonically for 15-30 minutes;

[0031] (3) Pipette 1.7 mL of tetrabutyl titanate solution into the solution in step (1) dropwise with a pipette gun, heat in a water bath at 30-60°C and stir for 6-24 hours;

[0032] (4) Centrifuge the above mixed solution and wash it three times with deionized water and absolute ethanol respectively, then dry at a constant temperature at 80°C for 12 hours, and finally calcinate at 200-500°C for 2-6 hours and cool to room temperature. TiO2-coated spinel lithium manganate was obtained, in which TiO 2 / LiMn 2 o 4 The mass ratio is 1%.

Embodiment 2

[0034] Same as Example 1, the difference is:

[0035] TiO 2 / LiMn 2 o 4 The mass ratio is 5%.

Embodiment 3

[0037] Same as Example 1, the difference is:

[0038] TiO 2 / LiMn 2 o 4 The mass ratio is 20%.

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly discloses a method for preparing spinel type lithium manganate coated with a metal oxide. The method includes the following steps that lithium manganate is added in absolute ethyl alcohol, concentrated ammonia water is added, and uniform ultrasonic dispersion is conducted; a precursor of the metal oxide is added in the absolute ethyl alcohol, and the uniform ultrasonic dispersion is conducted; the obtained precursor solution is dropwise added in a lithium manganate solution, and heating and stirring are conducted; the mixed solution is centrifuged, washed and dried, and the spinel type lithium manganate coated with the metal oxide is obtained after calcination. The method is simple in process, convenient to operate, and good in coating effect, and compared with lithium manganate which is not coated, the coated lithium manganate is better in high-temperature electrochemical cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a method for preparing metal oxide-coated spinel-type lithium manganate. Background technique [0002] In today's world where resources are increasingly depleted, it is particularly important to develop green and clean energy. Lithium-ion batteries have attracted the attention of scientific research and commercial development due to their outstanding advantages such as high energy density, high working voltage, good cycle performance, small self-discharge, small size, and no memory effect. Its application field has rapidly expanded from the initial mobile communication to various aspects of entertainment, military, aerospace, medical treatment, etc., including various portable electronic products, and is developing into large and medium-sized energy storage equipment and power supply. This is of great significance to reducing dependence on petro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/628H01M10/0525Y02E60/10
Inventor 余爱水张聪聪苏俊铭陈春光刘大亮李良昱苏启立黄桃
Owner FUDAN UNIV
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