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Coating modification method of lithium manganate

A lithium manganate and coating technology, which is applied in the field of lithium-ion battery cathode material preparation, can solve the problems of poor high-temperature cycle performance and achieve the effects of improved high-temperature cycle performance, uniform coating, and simple operation process

Inactive Publication Date: 2012-04-18
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for coating and modifying the surface of lithium manganese oxide, the positive electrode material of lithium ion batteries, to improve the problem of its poor high-temperature cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Nano-alumina powder and lithium manganate powder are added to the fusion device at a molar ratio of 0.05:1, the rotational speed is adjusted to 2600 rpm, and the fusion time is 4 hours. After taking it out, put it into a muffle furnace, set the temperature of the muffle furnace to 700°C, and keep the temperature constant for 8Hr. Cool to room temperature to obtain a lithium manganate positive electrode material coated with aluminum oxide.

Embodiment 2

[0021] Nano-sized zirconia powder and lithium manganese oxide powder are added to the fusion device at a molar ratio of 0.03:1, the rotational speed is adjusted to 6000 rpm, and the fusion time is 1 hour. After taking it out, put it into a muffle furnace, set the temperature of the muffle furnace to 900°C, and keep the temperature constant for 5Hr. Cool to room temperature to obtain a lithium manganate positive electrode material coated with zirconia.

Embodiment 3

[0023] Nano titanium dioxide powder and lithium manganese oxide powder are added to the fusion equipment according to the molar ratio of 0.08:1, the rotational speed is adjusted to 3500 rpm, and the fusion time is 4 hours. After taking it out, put it into a muffle furnace, set the temperature of the muffle furnace to 750°C, and keep the temperature constant for 8Hr. Cool to room temperature to obtain a lithium manganate positive electrode material coated with titanium oxide.

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Abstract

The invention is a coating modification method of lithium manganate. A novel powder processing apparatus with a mixing-fusion function is selected; micron-level lithium manganate powder is coated by nanometer metal oxide powder, and a mechanical fusion state is reached; and the coated modified lithium manganate material with a uniform surface is obtained by calcination. The processing method is simple, has high coating efficiency, good effect, no material loss, and is an industrial production method.

Description

technical field [0001] The invention relates to the technical field of preparation of cathode materials for lithium ion batteries, in particular to a method for coating and modifying lithium manganate. Background technique [0002] At present, with the development of the electric vehicle industry, the cathode material, which accounts for about 40% of the cost of lithium batteries, has attracted more and more attention. Compared to LiCoO 2 、LiFePO 4 and ternary materials, spinel LiMn 2 o 4 It has obvious advantages such as cheap price, simple preparation method, good rate performance, etc., especially in power batteries, it is considered to be one of the positive electrode materials of lithium batteries with good application prospects. However, due to the LiPF in the electrolyte 6 and H 2 HF produced by the O reaction induces Mn 3+ The disproportionation reaction occurs, leading to capacity fading during the cycle, especially at high temperature, and aggravated with th...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505
CPCY02E60/122Y02E60/10
Inventor 叶学海刘红光张晓波付春明张春丽于晓微肖彩英夏继平
Owner CHINA NAT OFFSHORE OIL CORP
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