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Method for removing fine powder in lithium manganate electrode materials in situ

A technology for removing lithium manganate and electrode materials, which is applied in the direction of manganate/permanganate, etc., can solve the problems of increasing production costs and increasing production processes, and achieve the goal of concentrating particle size distribution, reducing production processes, and reducing production costs Effect

Inactive Publication Date: 2017-05-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method reclaims lithium manganate fine powder, it increases the production process and production cost simultaneously.

Method used

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  • Method for removing fine powder in lithium manganate electrode materials in situ
  • Method for removing fine powder in lithium manganate electrode materials in situ

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 1000g of electrolytic manganese dioxide, 220g of lithium carbonate and 1.53g of niobium pentoxide (the ratio of the amount of substances is Li:(Mn+Nb)=0.5:1, and Nb:Mn=0.001:1) Mix in a ball mill for 1 hour to obtain a mixture;

[0023] (2) Put the mixture obtained in step (1) into a sagger, put it into an electric heating kiln, and roast it under an oxygen atmosphere at 860° C. for 12 hours to obtain a roasted product;

[0024] (3) Put the roasted product into a blender and mix evenly, pass through a 325-mesh sieve to remove large agglomerated particles, and obtain the finished lithium manganate material from which fine powder has been removed.

Embodiment 2

[0026] (1) 1000g of electrolytic manganese dioxide, 258g of lithium hydroxide and 15.3g of niobium pentoxide (the ratio of the amount of substances is Li:(Mn+Nb)=0.53:1, and Nb:Mn=0.01:1) Added into a ball mill and mixed for 4h to obtain a mixture;

[0027] (2) Put the mixture obtained in step (1) into a sagger, put it into an electric heating kiln, and roast it in an air atmosphere at 750° C. for 50 hours to obtain a roasted product;

[0028] (3) Put the roasted product into a blender and mix evenly, pass through a 325-mesh sieve to remove large agglomerated particles, and obtain the finished lithium manganate material from which fine powder has been removed.

Embodiment 3

[0030] (1) 1000g of electrolytic manganese dioxide, 255g of lithium carbonate and 23g of niobium pentoxide (the ratio of the amount of substances is Li:(Mn+Nb)=0.58:1, and Nb:Mn=0.015:1) is added to Mixed in a ball mill for 6h to obtain a mixture;

[0031] (2) Put the mixture obtained in step (1) into a sagger, put it into an electric heating kiln, and roast it in an air atmosphere at 800°C for 20 hours to obtain a roasted product;

[0032] (3) Put the roasted product into a blender and mix evenly, pass through a 325-mesh sieve to remove large agglomerated particles, and obtain the finished lithium manganate material from which fine powder has been removed.

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Abstract

The invention discloses a method for removing fine powder in lithium manganate electrode materials in situ, and belongs to the technical field of lithium ion battery anode materials. Trace niobium compounds are added into reaction raw materials, so that lithium manganate fine powder grows up by agglomeration in the high-temperature solid-phase reaction process, and lithium manganate anode materials with proper size distribution can be obtained without size grading of roasted finished materials. The method has the advantages that the size grading process of the finished materials is omitted, production procedures are decreased, production cost is reduced, electrolytic manganese dioxide is sufficiently used, and additionally, the lithium manganate materials synthesized by the method is concentrated in size distribution, small in specific surface area and excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a method for removing fine powder in lithium manganate electrode materials in situ. The method can easily remove fine powder in lithium manganate electrode materials in the production process. Background technique [0002] Due to the advantages of high working voltage (3.7V), large specific energy, safety, environmental protection, and no memory effect, lithium-ion batteries are widely used in small lithium-ion batteries such as mobile phones, notebook computers, mobile power supplies, electric bicycles, electric vehicles, and wind power. and photoelectric energy storage and other large lithium-ion battery fields. [0003] Spinel lithium manganese oxide (LiMn 2 o 4 ) materials have been widely used in the field of commercial lithium-ion batteries due to the advantages of abundant Mn resources, low price, high specific c...

Claims

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Application Information

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IPC IPC(8): C01G45/12
CPCC01G45/12C01P2004/61C01P2006/12
Inventor 杨文胜李刚陈旭
Owner BEIJING UNIV OF CHEM TECH