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Preparation method for doped and modified spinel-type lithium manganite cathode material

A type of lithium manganate and spinel technology, which is applied in the field of secondary battery cathode material preparation, can solve the problems of increased reaction time, poor cycle performance and thermal stability, and unstable product performance.

Inactive Publication Date: 2012-07-18
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to limited reserves of cobalt resources, LiCoO 2 The cost is relatively high, and cobalt also has a certain impact on the environment, so the development of LiCoO 2 Alternative products have become a research hotspot in the battery industry in recent years.
[0004] LiNiO 2 with and LiCO 2 The same spatial structure, the actual capacity is 190-210mAh / g, but the defects of this material are: (1) its cycle performance and thermal stability are poor, and the working voltage is low; (2) it is difficult for us to get the stoichiometric than LiNiO 2 , and it was found that Li atoms and Ni atoms were misaligned, and a small amount of Ni atoms appeared in the Li layer; (3) the Li-deficient compound formed after Li was extracted was not stable enough, and the structure collapsed easily
However, due to the more complex chemical reactions in the process of forming spinel lithium manganate after doping with metal elements, the breaking of metal bonds and the formation of ionic bonds will increase the reaction time, and once improper operation will lead to the formation of metal elements. Uneven doping, resulting in unstable performance of the final product

Method used

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  • Preparation method for doped and modified spinel-type lithium manganite cathode material
  • Preparation method for doped and modified spinel-type lithium manganite cathode material
  • Preparation method for doped and modified spinel-type lithium manganite cathode material

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preparation example Construction

[0030] In order to solve the above problems, the invention provides a method for preparing doped modified spinel lithium manganate, comprising:

[0031] mixing the lithium source compound, the manganese source compound, the doping metal salt and the roasting accelerator to obtain a mixture;

[0032]Roasting the mixture to obtain doped modified spinel lithium manganese oxide;

[0033] Wherein, the roasting accelerator includes: one or more of acetylene black, activated carbon powder, coke powder, and charcoal powder.

[0034] According to the present invention, the manganese source compound can refer to any manganese source compound known to those skilled in the art, preferably one or more of manganese nitrate, manganese chloride, manganese acetate, manganese sulfate or manganese carbonate, but not limited to this. The lithium source compound may refer to any lithium source compound known to those skilled in the art, preferably one or more of lithium nitrate, lithium chloride...

Embodiment 1

[0044] The embodiment is to carry out doping according to the feed ratio Li:Mn=1.2:2 (molar ratio).

[0045] Take by weighing 6.4420g mass fraction and be 50% Mn (NO 3 ) 2 solution, add 0.5093g LiCl and stir to dissolve it. Add 0.4289g AlCl 3 , continue to stir to dissolve it, then add 0.25g of acetylene black, stir evenly, and bake in an oven at 70°C for about 12 hours.

[0046] After the mixture was taken out from the oven, it was calcined in a resistance furnace at 800°C for 2h, cooled to room temperature, washed with water, and dried at 70°C to obtain an Al-doped spinel sample.

Embodiment 2

[0048] The embodiment is to carry out doping according to the feed ratio Li:Mn=1.2:2 (molar ratio).

[0049] Take by weighing 6.4420g mass fraction and be 50% Mn (NO 3 ) 2 solution, add 0.5093g LiCl and stir to dissolve it. Add 0.5816g Ni(NO 3 ) 2 , continue to stir to dissolve it, then add 0.25g of acetylene black, stir evenly, and bake in an oven at 70°C for about 12 hours.

[0050] After the mixture was taken out from the oven, it was calcined in a resistance furnace at 800°C for 2h, cooled to room temperature, washed with water, and dried at 70°C to obtain a Ni-doped spinel sample.

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Abstract

The invention provides a preparation method for a doped and modified spinel-type lithium manganite cathode material, which comprises the following steps of: mixing a lithium source compound, a manganese source compound, doped metal salt with a roasting accelerator to obtain a mixture; then, roasting the mixture to obtain metal element-doped spinel-type lithium manganite, wherein the roasting accelerator comprises one or more than one of acetylene black, active carbon powder, coke powder and charcoal powder. The preparation method provided by the invention is low in roasting temperature and is short in roasting time, and meanwhile, the obtained doped and modified spinel-type lithium manganite is stable in product quality and is uniform in performance.

Description

technical field [0001] The invention relates to the field of preparation of positive electrode materials for secondary batteries, in particular to a method for preparing a doped modified spinel type lithium manganate positive electrode material. Background technique [0002] As an important energy storage device for portable electronic devices, electric tools and electric vehicles, lithium-ion batteries have the advantages of high power density, high specific energy, and long cycle life. The positive electrode material is an important part of lithium-ion batteries. At present, the active research on positive electrode materials focuses on the layered compound LiMO. 2 (Ni, Mn, Co), LiMn with spinel structure 2 o 4 and olivine-type LiFePO 4 . [0003] Layered LiCoO 2 As a positive electrode material for lithium-ion batteries, it has the advantages of high discharge capacity, good cycle performance and stable working voltage, and its synthesis process is simple, and its cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505
CPCY02E60/122Y02E60/10
Inventor 杨晓晶林珍珍田润稼王翰轩周俊良
Owner BEIJING NORMAL UNIVERSITY
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