Preparation method for lithium manganite hollow pipe in spindle shape

A body-shaped lithium manganate, hollow tube technology, applied in chemical instruments and methods, manganate/permanganate, manganese compounds, etc., can solve the problems of long synthesis reaction time, high equipment requirements, and a large number of organic reagents , to achieve good application prospects, large surface area, and the effect of improving specific capacity and power density

Active Publication Date: 2018-08-28
UNIV FOR SCI & TECH ZHENGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the solid-phase method has a simple process, but the synthesis reaction time is long and the product uniformity is poor. The sol-gel method requires a large amount of organic reagents, which causes great environmental pollution, and the spray-drying method requires high equipment requirements.

Method used

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  • Preparation method for lithium manganite hollow pipe in spindle shape
  • Preparation method for lithium manganite hollow pipe in spindle shape

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A preparation method of a spindle-shaped lithium manganate hollow tube, comprising the steps of:

[0027] (1) Lithium nitrate is prepared into a 0.5mol / L lithium salt solution with deionized water; manganese acetate and potassium permanganate are mixed uniformly according to a molar ratio of 3:1, and then prepared into a manganese salt solution with deionized water , the total concentration of manganese ions in the manganese salt solution is 1mol / L; the urea solution with deionized water preparation concentration is 0.5mol / L;

[0028] (2) adding naphthalene in dehydrated alcohol, stirring to form a uniform solution;

[0029] (3) Add the lithium salt solution in step (1) into the hydrothermal reaction kettle, the amount of which is 1 / 4 of the volume of the hydrothermal reaction kettle, then add the ethanol solution of naphthalene, stir evenly to form a light white suspension Liquid, wherein the molar ratio of naphthalene to lithium ions is 1:1;

[0030] (4) Add the man...

Embodiment 2

[0035] A preparation method of a spindle-shaped lithium manganate hollow tube, comprising the steps of:

[0036] (1) Lithium acetate and lithium chloride are prepared 1mol / L lithium salt solution with deionized water; Manganese nitrate and potassium permanganate are mixed evenly according to the molar ratio of 2:1, and then prepared with deionized water Manganese salt solution, the total concentration of manganese ions in the manganese salt solution is 1.2mol / L; the urea solution with deionized water preparation concentration is 0.5mol / L;

[0037] (2) adding naphthalene in dehydrated alcohol, stirring to form a uniform solution;

[0038] (3) Add the lithium salt solution in step (1) into the hydrothermal reaction kettle, the amount of which is 1 / 5 of the volume of the hydrothermal reaction kettle, then add the ethanol solution of naphthalene, stir evenly to form a light white suspension Liquid, wherein the molar ratio of naphthalene to lithium ions is 1:2;

[0039] (4) Add t...

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Abstract

The invention discloses a preparation method for a lithium manganite hollow pipe in a spindle shape. Soluble lithium salt, divalent soluble manganese salt and potassium permanganate are taken as raw materials, naphthalene is taken as a template agent, and urea is taken as a precipitating agent; the lithium manganite hollow pipe in the spindle shape is obtained through the hydrothermal reaction andcalcining, and the length is 200-800 nanometers. According to the preparation method, an easy sublimation characteristic of the naphthalene is utilized, as the template agent, the naphthalene is subjected to the hydrothermal reaction, a precursor is obtained and undergoes the calcining, the naphthalene is sublimed and escapes from the lithium manganite material, the crystallinity degree of the lithium manganite materials is further improved at a high temperature, and the lithium manganite hollow pipe in the spindle shape is finally obtained. The lithium manganite hollow pipe in the spindle shape can be taken as positive materials of lithium batteries, improve specific capacity and power density of the lithium batteries, and have a better application prospect.

Description

technical field [0001] The invention relates to a preparation method of lithium manganate material, in particular to a preparation method of a spindle-shaped lithium manganate hollow tube. Background technique [0002] In recent years, with the rapid development of various electronic devices, the requirements for batteries are getting higher and higher, not only requiring the batteries to have a large enough capacity, but also requiring them to have small attenuation after many cycles. Among the many battery types, lithium-ion batteries are regarded as the battery with the most development potential. Moreover, lithium batteries have begun to take shape in the market, ranging from electric vehicles to notebooks and mobile phones, all of which cannot do without lithium batteries. [0003] Lithium manganate (LiMn 2 o 4 ) has become one of the most promising cathode materials for lithium-ion batteries due to its high voltage, low price, abundant resources, and environmental f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/0525
CPCC01G45/1242C01P2004/04C01P2004/30C01P2004/62H01M4/505H01M10/0525H01M2004/021Y02E60/10
Inventor 郭禧斌
Owner UNIV FOR SCI & TECH ZHENGZHOU
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