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Process for preparing spinel-type lithium manganate as positive electrode active material of lithium ion storage battery

A cathode active material, lithium manganate technology, applied in battery electrodes, chemical instruments and methods, manganate/permanganate, etc., can solve the problems of rapid capacity decay and poor high temperature stability

Inactive Publication Date: 2005-01-26
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems of spinel-type lithium manganese oxide are the rapid capacity decay during the charge-discharge cycle and poor high-temperature stability.

Method used

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  • Process for preparing spinel-type lithium manganate as positive electrode active material of lithium ion storage battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] a. Use lithium carbonate micropowder with a purity of 99.5%, the particle size range is 20 μs, industrial pure electrolytic manganese dioxide micropowder, the particle size range is 30 μs, analyze pure aluminum oxide powder, analyze pure nickel oxide powder, analyze pure dioxide Chromium micropowder is used as a raw material, and is proportioned according to the atomic ratio, wherein Li:Mn:Al:Ni:Cr=1.00:1.5:0.01:0.01:0.01;

[0015] b. Add the weighed raw materials into deionized water for wet mixing, wherein the ratio of the raw materials to water is 1:1.0, mix for 1 hour in the agitating mill, and the rotating speed of the agitating mill is 1000 rpm, put the wet-milled mixed raw materials into Dry in an oven at 100°C for 48 hours, then dry mix and sieve the dried raw materials as raw materials for sintering;

[0016] c. Put the raw material into a muffle furnace with a high sintering temperature of 1200°C for pre-sintering, the pre-sintering temperature is 500°C, keep ...

Embodiment 2

[0020] a. Use lithium carbonate micropowder with a purity of 99.5%, the particle size range is 25μs, industrial pure electrolytic manganese dioxide micropowder, the particle size range is 40μs, analyze pure aluminum oxide powder, analyze pure nickel oxide powder, analyze pure dioxide Chromium micropowder is used as a raw material, and the proportion is according to the atomic ratio, wherein Li:Mn:Al:Ni:Cr=1.05:2.0:0.03:0.03:0.04;

[0021] b. Add the weighed raw materials into deionized water for wet mixing, wherein the ratio of material to water is 1:1.5, mix them in the agitating mill for 2 hours, and the rotating speed of the agitating mill is 1200 rpm, put the wet-milled mixed raw materials into Dry in an oven at 110°C for 55 hours, dry mix and sieve the dried raw materials to prepare for sintering;

[0022] c. Put the raw material into a muffle furnace with a high sintering temperature of 1200°C for pre-sintering, the pre-sintering temperature is 550°C, keep the temperatur...

Embodiment 3

[0026] a. Use lithium carbonate micropowder with a purity of 99.5%, the particle size range is 30 μs, industrial pure electrolytic manganese dioxide micropowder, the particle size range is 50 μs, analyze pure aluminum oxide powder, analyze pure nickel oxide powder, analyze pure dioxide Chromium micropowder is used as a raw material, and the ratio is according to the atomic ratio, wherein Li:Mn:Al:Ni:Cr=1.10:2.5:0.05:0.05:0.08;

[0027] b. Add the weighed raw materials into deionized water for wet mixing, wherein the ratio of the materials to water is 1:2.0, mix them in the agitating mill for 3 hours, and the rotating speed of the agitating mill is 1500 rpm, put the raw materials mixed in the wet milling Dry in an oven at 120°C for 60 hours, then dry mix and sieve the dried raw materials to prepare for sintering;

[0028] c. Put the raw material into a muffle furnace with a high sintering temperature of 1200°C for pre-sintering, the pre-sintering temperature is 600°C, keep the ...

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Abstract

The invention relates to a process for preparing spinel-type lithium manganate as positive electrode active material of lithium ion storage battery by doping lithium carbonate, manganese dioxide, alumina, nickel sesquioxide and dichromium trioxide to improve the cycling stability of the spinelle type lithium maganate anode material. The spinelle type lithium manganate anode material exhibites fine performance through overcharge and discharge rotational test.

Description

technical field [0001] The invention relates to a preparation method of spinel-type lithium manganese oxide, a positive electrode active material of a lithium-ion storage battery. Background technique [0002] At present, the commercialized positive electrode material of lithium-ion batteries is lithium cobalt oxide. Since cobalt resources are scarce, expensive, and highly toxic, it is imperative to use cheap and easy-to-obtain materials. At present, the most promising cathode material is spinel lithium manganese oxide. Although its capacity is slightly lower than that of lithium cobalt oxide, it is popular because of its low price and no pollution to the environment. Especially in the power battery, the cheap spinel lithium manganese oxide is the most competitive. At present, the main problems of spinel-type lithium manganese oxide are the rapid capacity decay during the charge-discharge cycle and poor high-temperature stability. Many solutions hav...

Claims

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Application Information

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IPC IPC(8): C01D15/00C01G45/12H01M4/58
CPCY02E60/12Y02E60/10
Inventor 康雪雅韩英王天雕
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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