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Method for producing high-capacity lithium manganate by using manganous manganic oxide

A technology of trimanganese tetraoxide and lithium manganate, which is applied in the direction of manganate/permanganate, electrical components, battery electrodes, etc., can solve the problem that the capacity of lithium manganate cannot generally adapt to lithium batteries, etc., and achieve a short processing cycle , The effect of simple production process

Inactive Publication Date: 2014-03-05
HENAN FUSEN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage, lithium manganate is the first material for the positive electrode of the battery, so the lithium manganate industry will have a large development space in the future; a preparation method of lithium manganate positive electrode material is disclosed in CN 103219509 A, especially A method for preparing a high-magnification, high-cycle performance spinel lithium manganese oxide positive electrode material, which belongs to the field of energy materials; the invention uses manganese dioxide as a raw material, and obtains lattice doping, containing manganese dioxide, The precursors of any one, two or three structures of manganese trioxide and trimanganese tetraoxide can improve the structural stability and performance of lithium manganate by controlling the valence state of the precursor; it uses manganese dioxide as a raw material , but the capacity of the prepared lithium manganate is generally unable to adapt to the faster and faster development of lithium batteries, so there is a need for a method that can increase the capacity of lithium manganate and improve the high temperature performance and cycle performance of lithium manganate

Method used

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  • Method for producing high-capacity lithium manganate by using manganous manganic oxide
  • Method for producing high-capacity lithium manganate by using manganous manganic oxide
  • Method for producing high-capacity lithium manganate by using manganous manganic oxide

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Embodiment 1

[0036] The method for manganese tetraoxide producing high-capacity lithium manganate comprises the steps:

[0037] a. Raw material mixing: Use 75kg of manganese tetraoxide, and lithium carbonate is mixed according to the molar ratio of lithium to manganese of 0.54, mixed with rare earth element lanthanum with a finished product content of 0.3% as an additive, and mixed evenly by dry method.

[0038] b. Sintering: The uniformly mixed lithium-manganese semi-finished products are sintered in a roller kiln. 6 hours at 650°C, 14 hours at 820°C, 7 hours at 700°C, 7 hours at 700°C, transitional heating and cooling in other temperature zones, the temperature difference of each temperature zone is less than 200°C. During the sintering process of lithium manganate, it is necessary to continuously supplement oxygen and discharge carbon dioxide in time to ensure that the reaction of lithium manganate is sufficient.

[0039] c. Post-sintering treatment: after sintering lithium mangana...

Embodiment 2

[0042] The method for manganese tetraoxide producing high-capacity lithium manganate comprises the steps:

[0043] b. Raw meal mixing: use 75kg of manganese tetraoxide, lithium carbonate is compounded according to the molar ratio of lithium to manganese of 0.53, and cobalt tetraoxide with a finished product content of 0.5% is added as an additive, and mixed evenly by dry method.

[0044] b. Sintering: Sinter the uniformly mixed lithium-manganese semi-finished products in a roller kiln. 550°C heat preservation for 8 hours, 850°C heat preservation for 13 hours, 600°C cooling for 7 hours, transitional heating and cooling in other temperature zones, the temperature difference of each temperature zone is less than 200°C. During the sintering process of lithium manganate, it is necessary to continuously supplement oxygen and discharge carbon dioxide in time to ensure that the reaction of lithium manganate is sufficient.

[0045] c. Post-sintering treatment: After sintering lithiu...

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Abstract

The invention discloses a method of producing high-capacity lithium manganate by using manganous manganic oxide. The method comprises the following steps: uniformly mixing manganous manganic oxide and lithium carbonate which are raw materials by a dry method according to a molar ratio of lithium to manganese being 0.48-0.58 and the weight percentage of an additive corresponding to a finished product being 0.1-1%; preparing a semi-finished product; and then, producing the high-capacity lithium manganate by process methods of sintering and post-treatment. The method disclosed by the invention is simple in process and simple and convenient to operate, and can produce high-capacity lithium manganate within a short time, so that the capacity of a lithium manganate positive electrode material can be improved by over 10%, and the method is worth popularizing and applying.

Description

technical field [0001] The invention belongs to the technical field of lithium ion cathode material powder processing, in particular to a method for producing high-capacity lithium manganese oxide from trimanganese tetroxide. technical background [0002] The positive electrode materials of lithium-ion rechargeable batteries can be divided into lithium cobalt oxide, nickel cobalt lithium manganese oxide with layered crystal structure, lithium manganese oxide with cubic spinel structure, and lithium iron phosphate with orthorhombic olivine crystal structure. Several types. Among them, lithium manganese oxide has been developed rapidly in recent years due to its advantages of high performance, safety and low cost. [0003] Molecular formula of lithium manganese oxide: LiMn 2 o 4 , molecular weight: 180.817. The reversible capacity is between 100-115mAh / g, and the cycle can reach more than 500 times and still maintain 80% of the capacity. LiMn 2 o 4 It is a typical ionic ...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/505
CPCY02E60/122Y02E60/10
Inventor 曹长城高云
Owner HENAN FUSEN NEW ENERGY TECH
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