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Submicron lithium manganite for positive electrode of lithium ion battery and preparation method of submicron lithium manganite

A lithium-ion battery, grade lithium manganate technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of short electron and ion transport channels, unsuitable for commercial applications, capacity decay, etc. The effect of good performance, low cost and high specific capacity

Active Publication Date: 2017-11-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium manganese oxide synthesized by the traditional solid-state method faces a serious disadvantage, that is, the rapid capacity decay, which is mainly due to the disproportionation reaction of Mn ions (2Mn 3+ →Mn 2+ +Mn4 + ) and phase transition
Nanostructures are widely used in battery materials to improve performance because they can provide short electron and ion transport channels, but these methods are often complex and costly, and are not suitable for commercial applications

Method used

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  • Submicron lithium manganite for positive electrode of lithium ion battery and preparation method of submicron lithium manganite
  • Submicron lithium manganite for positive electrode of lithium ion battery and preparation method of submicron lithium manganite
  • Submicron lithium manganite for positive electrode of lithium ion battery and preparation method of submicron lithium manganite

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of submicron lithium manganese oxide for positive electrode of lithium ion battery, comprising the steps of:

[0035] S1. Add cetyltrimethylammonium bromide to cyclohexane to obtain the first material; add manganese salt to the oxalic acid solution to obtain the second material; uniformly mix the first material and the second material to obtain the third material; The third material is heated until the volatilization is complete, and then solid-phase sintering is carried out to obtain the black product Mn 2 o 3 ;

[0036] S2, lithium salt, black product Mn 2 o 3 After mixing with the dispersant, grinding, drying, followed by solid phase sintering and cooling to obtain submicron lithium manganese oxide for lithium ion battery positive electrode.

Embodiment 2

[0038] A preparation method of submicron lithium manganese oxide for positive electrode of lithium ion battery, comprising the steps of:

[0039] S1. Add cetyltrimethylammonium bromide to cyclohexane to obtain the first material with a concentration of 0.03g / mL; add manganese acetate dihydrate to an oxalic acid solution with a concentration of 0.8mol / L to obtain the second material , the concentration of manganese acetate in the second material is 0.12g / mL; the first material and the second material are mixed evenly to obtain the third material; Sintered for 5h to get the black product Mn 2 o 3 ;

[0040] S2, lithium hydroxide monohydrate, black product Mn 2 o 3 Mix with ethanol or acetone, lithium hydroxide monohydrate and black product Mn 2 o 3 The molar ratio is 1.02:1, grind for 35min, dry, then raise the temperature to 450°C, keep it for 5h, raise the temperature to 750°C, keep it for 7h, the heating rate is 4.5°C / min, and cool to obtain submicron manganic acid for ...

Embodiment 3

[0042] A preparation method of submicron lithium manganese oxide for positive electrode of lithium ion battery, comprising the steps of:

[0043] S1. Add cetyltrimethylammonium bromide to cyclohexane to obtain the first material with a concentration of 0.05g / mL; add manganese acetate dihydrate to an oxalic acid solution with a concentration of 0.5mol / L to obtain the second material , the concentration of manganese acetate in the second material is 0.13g / mL; the first material and the second material are mixed evenly to obtain the third material; Sintered for 3h to get the black product Mn 2 o 3 ;

[0044] S2, lithium hydroxide monohydrate, black product Mn 2 o 3 Mix with ethanol or acetone, lithium hydroxide monohydrate and black product Mn 2 o 3 The molar ratio is 1.08:1, grind for 25min, dry, then raise the temperature to 500°C, keep it for 3h, raise the temperature to 850°C, keep it for 5h, the heating rate is 5.2°C / min, and cool to get submicron manganic acid for lit...

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Abstract

The invention discloses a preparation method of submicron lithium manganite for a positive electrode of a lithium ion battery. The method comprises steps as follows: hexadecyl trimethyl ammonium bromide is added to cyclohexane, and a first material is obtained; manganese salt is added to an oxalic acid solution, and a second material is obtained; the first material and the second material are mixed uniformly, and a third material is obtained; the third material is heated to be completely volatilized, then, solid phase sintering is performed, and a black product Mn2O3 is obtained; lithium salt, the black product Mn2O3 and a dispersant are mixed, ground, dried, subjected to solid phase sintering and cooled, and the submicron lithium manganite for the positive electrode of the lithium ion battery is obtained. The preparation method is simple and environment-friendly, industrial production is easy to realize, the submicron lithium manganite for the positive electrode of the lithium ion battery has the advantages of high specific discharge capacity, very stable cycling performance, good rate capability and the like in the lithium ion battery and has broad application prospects in the fields of electric automobiles, energy storage base stations and rapid charging equipment.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a submicron lithium manganese oxide for positive electrodes of lithium ion batteries and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of electronic equipment and electric vehicles, people's demand for fast-charging secondary batteries with high energy density is increasing. However, the high cost and energy density limit force people to start looking for new material systems. [0003] Spinel-type lithium manganese oxide is considered to be a very competitive high-voltage cathode material that can effectively replace commercially used lithium cobalt oxide, because of its abundance of raw materials, environmental friendliness, low cost, and good safety. However, lithium manganese oxide synthesized by the traditional solid-state method faces a serious disadvantage, that is, the rapid capacity decay, which is m...

Claims

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Application Information

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IPC IPC(8): C01G45/12C01G45/02H01M4/505H01M10/0525
CPCC01G45/02C01G45/1242C01P2002/72C01P2004/03C01P2004/41C01P2004/61C01P2004/62C01P2006/40H01M4/505H01M10/0525Y02E60/10
Inventor 许家齐樊少娟杨立铭
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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