Preparation method of nanometer solid-phase coated lithium battery cathode material

A positive electrode material, coating technology, applied in the field of preparation of nano solid-phase coated lithium battery positive electrode materials, can solve the problems of material agglomeration, affecting electrochemical performance, etc., and achieve the effect of mild reaction and preparation process

Active Publication Date: 2016-10-26
YINGDE KEHENG NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: in view of the currently prepared coating type lithium battery cathode material, through liquid phase recombination, it is easy to cause the agglomeration of the material in the liquid phase, which affects its electrochemical performance. Stir and mix potassium permanganate and lithium hydroxide and precipitate to prepare nano-lithium manganate, then s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] According to the mass ratio of 1:10, potassium permanganate and deionized water were stirred and mixed to prepare potassium permanganate solution, and then in parts by weight, 15 parts of absolute ethanol, 45 parts of potassium permanganate solution and Put 5 parts of lithium hydroxide in an Erlenmeyer flask, stir and mix, and leave it to age for 6 hours to prepare the aged solution; heat the aged solution in an oil bath at 170°C for 1 hour, then let it stand and cool to room temperature, and at 1800r / Centrifuge at 1 min for 10 min, collect the lower precipitate, wash with absolute ethanol for 3 times, dry at 78°C for 6 h, and grind to prepare nano-lithium manganate powder for later use; collect fresh peach gum, wash it with water and dry it naturally Dry in the air, then mix the air-dried peach gum with deionized water according to the mass ratio of 1:10, stir magnetically at 880r / min for 1h, then let it stand at room temperature for degassing treatment for 6h, collect...

example 2

[0020] According to the mass ratio of 1:10, potassium permanganate and deionized water were stirred and mixed to prepare potassium permanganate solution, and then weighed 17 parts of absolute ethanol, 47 parts of potassium permanganate solution and Put 8 parts of lithium hydroxide in an Erlenmeyer flask, stir and mix, and leave it to age for 7 hours to prepare the aged solution; heat the aged solution in an oil bath at 175°C for 1 hour, then let it stand and cool to room temperature, at 2100r / Centrifuge at 1 min for 12 min, collect the lower precipitate, wash with absolute ethanol for 4 times, dry at 80°C for 7 h, and grind to prepare nano-lithium manganese oxide powder for later use; collect fresh peach gum, wash with water and dry naturally Dry in the air, then mix the air-dried peach gum with deionized water according to the mass ratio of 1:10, stir magnetically at 890r / min for 2h, then let it stand at room temperature for degassing treatment for 7h, collect the degassed pe...

example 3

[0023]According to the mass ratio of 1:10, potassium permanganate and deionized water were stirred and mixed to prepare potassium permanganate solution, and then weighed 20 parts of absolute ethanol, 50 parts of potassium permanganate solution and Put 10 parts of lithium hydroxide in an Erlenmeyer flask, stir and mix, and leave it to age for 8 hours to prepare the aged solution; heat the aged solution in an oil bath at 180°C for 2 hours, then let it stand and cool to room temperature, at 2500r / Centrifuge at 1 min for 15 min, collect the lower precipitate, wash with absolute ethanol for 5 times, dry at 85°C for 8 h, and grind to prepare nano-lithium manganate powder for later use; collect fresh peach gum, wash it with water and dry it naturally Dry in the air, then mix the air-dried peach gum with deionized water according to the mass ratio of 1:10, stir magnetically at 900r / min for 2h, then let stand at room temperature for degassing treatment for 8h, collect the degassed peac...

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PUM

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Abstract

The invention discloses a preparation method of a nanometer solid-phase coated lithium battery cathode material, and belongs to the technical field of preparation of a lithium battery cathode material. In preparation of a coated lithium battery cathode material in the prior art, through liquid-phase compounding, the problem that materials are prone to aggregate in a liquid phase, resulting in affecting electrochemical performance of the lithium battery cathode material is solved. Provided is the preparation method comprising, stirring and mixing potassium permanganate and lithium hydroxide and performing precipitation to prepare nanometer lithium manganate, stirring and mixing nanometer lithium manganate powder and dried peach gum and performing solid-phase coating, and performing roasting and carbonization to prepare the solid-phase coated lithium battery cathode material. Through solid-phase coating, lithium manganate powder is effectively prevented from agglomeration during dispersion in a liquid phase. A lithium battery prepared from the lithium battery cathode material has the first discharge capacity being 130 mAh/g, the electric capacity being 125 mAh/g after charging and discharging for 50 times, and the capacity retention ratio being as high as 96.2%. The preparation method is available in raw materials, mild in reaction, and simple in preparation process, is green and eco-friendly, and is free of pollution.

Description

technical field [0001] The invention discloses a preparation method of a nanometer solid-phase coated lithium battery positive electrode material, belonging to the technical field of lithium battery positive electrode material preparation. Background technique [0002] In the new electrochemical energy storage system, metal lithium has the highest specific capacity and the most negative potential among the existing negative electrode materials, so the energy storage system using metal lithium as the negative electrode material is the most promising high specific energy system. Lithium is the lightest non-gaseous metal substance in nature, and its intrinsic potential is lower than that of any other metal. Therefore, compared with other types of batteries, the specific capacity (capacity per unit weight) and bulk density ( Capacity per unit volume) are the highest, with unparalleled advantages. Lithium metal polymer batteries use metal lithium as the negative electrode. The m...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/1391B82Y40/00
CPCB82Y40/00H01M4/1391H01M4/366H01M4/505Y02E60/10
Inventor 陈毅忠高玉刚
Owner YINGDE KEHENG NEW ENERGY TECH CO LTD
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