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Method for preparing high-multiplying-factor porous lithium manganate

A porous lithium manganate and high-rate technology, which is applied in the field of preparation of high-rate porous lithium manganate, can solve problems such as difficult large-scale production, cumbersome operation, and complicated preparation process, and achieve easy industrialization, simple equipment and process, and simple process Effect

Inactive Publication Date: 2017-05-31
于英民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the existing literature reports and patents, the preparation process used is complicated, the operation is cumbersome, and it is difficult to produce on a large scale

Method used

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  • Method for preparing high-multiplying-factor porous lithium manganate
  • Method for preparing high-multiplying-factor porous lithium manganate
  • Method for preparing high-multiplying-factor porous lithium manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 16ml of DMF to a 100ml polytetrafluoroethylene stainless steel reaction kettle, weigh 4mmol of terephthalic acid into the reaction kettle, stir evenly, and then weigh 24mmol of MnCl 2 Add it into a reaction kettle, stir evenly, seal it, put it in an oven, heat at 150° C. for 48 hours, and filter and dry to obtain a metal-organic framework containing manganese. The manganese-containing metal-organic framework and lithium carbonate were uniformly mixed at a molar ratio of manganese and lithium elements of 2:1.05, and sintered at 650° C. for 10 hours to obtain porous lithium manganese oxide.

[0032] figure 1 SEM photo of porous lithium manganese oxide; figure 2 XRD picture of porous lithium manganese oxide.

[0033] From figure 1 It can be seen that the prepared lithium manganate is a porous structure, wherein the particle size of lithium manganate is 20-40 nanometers, from figure 2 It can be seen that its XRD is consistent with the standard card.

Embodiment 2

[0035] Add 8ml of DMF to a 50ml polytetrafluoroethylene stainless steel reaction kettle, weigh 2mmol of terephthalic acid and add it to the reaction kettle, stir evenly, and then weigh 24mmol of MnCl 2 Add it into a reaction kettle, stir evenly, seal it, put it in an oven, heat it at 120° C. for 72 hours, filter and dry it, and obtain a metal-organic framework containing manganese. The manganese-containing metal-organic framework and lithium hydroxide were uniformly mixed at a molar ratio of manganese and lithium elements of 2:1, and sintered at 850° C. for 10 hours to obtain porous lithium manganate.

Embodiment 3

[0037] Add 8ml of DMF to a 50ml polytetrafluoroethylene stainless steel reaction kettle, weigh 2mmol of terephthalic acid and add it to the reaction kettle, stir evenly, and then weigh 24mmol of MnCl 2 Add it into a reaction kettle, stir evenly, seal it, put it in an oven, heat it at 180° C. for 24 hours, filter and dry it, and obtain a metal-organic framework containing manganese. The manganese-containing metal-organic framework and lithium hydroxide were uniformly mixed at a molar ratio of manganese to lithium of 2:1.1, and sintered at 600°C for 5 hours to obtain porous lithium manganese oxide.

[0038] Weigh 0.2 g of the final product, mix it with carbon black and PVDF at a mass ratio of 8:1:1, and stir it thoroughly with NMP as a solvent. After mixing evenly, apply it to aluminum foil and dry it in vacuum at 100°C for 12 hours. After cutting, pack it into a battery in a glove box, and do a high-rate performance test on a charge-discharge instrument. image 3 It is the hig...

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Abstract

The invention relates to a method for preparing high-multiplying-factor porous lithium manganate. The method comprises the steps of sintering a manganese-containing metal-organic framework material, which serves as a precursor, and a lithium source at a high temperature, so as to prepare lithium manganate with the primary particle size of 20nm to 60nm. The porous lithium manganate material prepared by the method is of a homodisperse nanoscale, the nano lithium manganate is uniform in distribution of particle size and porosity, lithium manganate has very good high multiplying factor performance, and the material is excellent in electrochemical properties. The method is simple and environmentally friendly and is short in reaction time and low in synthesis temperature, thereby facilitating industrialization.

Description

technical field [0001] The invention relates to the technical field of lithium battery cathode materials, in particular to a preparation method of high-rate porous lithium manganese oxide. Background technique [0002] Lithium-ion battery is currently the most promising power supply technology. It has the advantages of high working voltage, high energy density, small self-discharge, long cycle life, no memory effect, fast charging and no environmental pollution. It is an ideal power supply for portable electronic devices. , is also an ideal power system for electric vehicles. Lithium manganate material has become one of the most promising cathode materials because of its high energy density, good safety, and low price. However, due to the nature of lithium manganese oxide as a semiconductor, the electronic conductivity is low, and the particle size of commercially available lithium manganate is large, and the diffusion distance of lithium ions is long, resulting in limited ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M10/0525C01G45/12B82Y30/00
CPCB82Y30/00C01G45/12C01P2002/72C01P2004/03C01P2004/64H01M4/505H01M10/0525Y02E60/10
Inventor 于汇洋于同峰于同建于涛
Owner 于英民
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