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Method for preparing lithium-rich manganese-based cathode material for lithium ion battery

A lithium-ion battery, lithium-rich manganese-based technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of harsh material preparation conditions, large consumption of organic acids or alcohols, unsuitable for large-scale production, etc., and achieve easy industrialization. The effect of application, high drying efficiency and excellent electrochemical performance

Inactive Publication Date: 2013-01-16
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The pH value of the reaction system needs to be precisely controlled during the formation of the sol. Once the pH value changes, the sol may not be obtained, and the material preparation conditions are harsh;
[0006] 2) In order to eliminate the influence of impurity ions, ammonia water is generally used to adjust the pH value of the system, which can cause harm to the natural environment;
[0007] 3) The whole preparation process requires a long aging process;
[0008] 4) Often need to consume a large amount of expensive organic acids or alcohols, the cost is high, and it is not suitable for large-scale production

Method used

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  • Method for preparing lithium-rich manganese-based cathode material for lithium ion battery
  • Method for preparing lithium-rich manganese-based cathode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The lithium-rich manganese-based cathode material prepared in this example is 0.6Li[Li 1 / 3 mn 2 / 3 ]O 2 0.4LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 . First, 38.7Kg of nickel nitrate, 38.7Kg of cobalt nitrate, 133.5 Kg of manganese nitrate and 84.4Kg of lithium nitrate were weighed according to the metal atomic ratio. In order to make up for the loss of lithium caused by high temperature synthesis, the excess of lithium source was 2%. Put the weighed raw materials into a heated and stirred reactor, and stir to dissolve. Add 44.3Kg of grafted starch into the reaction kettle, stir at high speed and heat to 80°C to gelatinize the grafted starch to form a dark brown gel. The gel was transferred to a belt dryer using a mud pump, and dried at 110°C to obtain a dense sheet-like xerogel. Put the dry gel into a roller kiln, sinter at 700°C for 10 hours under an oxygen atmosphere, and then jet mill to obtain a dark red lithium-rich manganese-based cathode material product. Its button b...

Embodiment 2

[0034] The lithium-rich manganese-based cathode material prepared in this example is 0.6Li[Li 1 / 3 mn 2 / 3 ]O 2 0.4LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 . First weigh 33.1Kg of nickel acetate, 33.1Kg of cobalt acetate, 130.9Kg of manganese acetate and 81.6Kg of lithium acetate according to the metal atomic ratio. In order to make up for the loss of lithium caused by high-temperature synthesis, the excess of lithium source was 3%. Put the weighed raw materials into a heated and stirred reactor, and stir to dissolve. Add 20Kg of oxidized starch and 6Kg of carboxymethylcellulose into the reaction kettle, stir at high speed and heat to 100°C to gelatinize the grafted starch and form a purple-red gel. The gel was transferred to a belt dryer using a mud pump, and dried at 120°C to obtain a dense sheet-like xerogel. Put the dry gel into a roller kiln, sinter at 750° C. for 6 hours under an oxygen atmosphere, and then jet crush to obtain a dark red lithium-rich manganese-based cathode mat...

Embodiment 3

[0036] The lithium-rich manganese-based cathode material prepared in this example is 0.6Li[Li 1 / 3 mn 2 / 3 ]O 2 0.4LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 . First, 38.7Kg of nickel nitrate, 38.7Kg of cobalt nitrate, 133.5 Kg of manganese nitrate and 85.2Kg of lithium nitrate were weighed according to the metal atomic ratio. In order to make up for the loss of lithium caused by high-temperature synthesis, the excess of lithium source was 3%. Put the weighed raw materials into a heated and stirred reactor, and stir to dissolve. Add 15Kg of oxidized starch, 5Kg of hydroxyethyl cellulose, and 10Kg of polyvinyl alcohol into the reaction kettle, stir at high speed and heat to 110°C to form a dark brown gel. The gel was transferred to a belt dryer using a mud pump, and dried at 150°C to obtain a dense sheet-like xerogel. Put the dry gel into a roller kiln, sinter at 850° C. for 10 hours in an oxygen atmosphere, and then jet mill to obtain a dark red lithium-rich manganese-based cathode mat...

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Abstract

The invention discloses a method for preparing a lithium-rich manganese-based cathode material for a lithium ion battery. The method is characterized by comprising the following steps of: 1) according to a chemical formula of a predetermined product, namely xLi[Li1 / 3Mn2 / 3]O2.(1-x)LiMO2 (wherein M=Ni, CO or Mn and x is more than 0 and less than 1), calculating and weighing a nickel source compound, a cobalt source compound, a manganese source compound and a lithium source compound in a ratio of metallic compositions, and putting the raw materials into a heating and stirring reaction kettle to prepare a solution in a specific concentration; 2) adding 5 to 30 percent of starch and 1 to 10 percent of thickening agent, heating to the temperature of between 80 and 110 DEG C, and continuously stirring to make the starch form a paste so as to obtain a gel; 3) transferring the gel to a belt drier, and drying at the temperature of between 110 and 150 DEG C; and 4) putting the dried gel in a roller kiln, treating at the high temperature of between 700 and 850 DEG C for 4 to 10 hours, cooling to obtain a black coarse material, and performing airstream pulverization to obtain the lithium-rich manganese-based cathode material.

Description

[0001] technical field [0002] The invention belongs to the technical field of lithium-ion battery cathode materials for chemical power sources, and relates to a preparation method of a lithium-rich manganese-based cathode material for a lithium-ion battery, in particular to a lithium-rich manganese-based cathode material xLi[Li 1 / 3 mn 2 / 3 ]O 2 ·(1-x)LiMO 2 (M=Ni, Co, Mn) preparation method. Background technique [0003] Lithium-rich manganese-based cathode materials are essentially a class of layered compounds Li[Li 1 / 3 mn 2 / 3 ]O 2 (i.e. Li 2 MnO 3 ) and LiMO 2 (M=Ni, Co, Mn) is a solid solution cathode material whose general chemical formula can be written as xLi[Li 1 / 3 mn 2 / 3 ]O 2 ·(1-x)LiMO 2 . Studies have shown that lithium-rich manganese-based cathode materials can achieve a specific capacity of more than 250mAh / g, fully meeting the needs of high-energy-density lithium-ion batteries, and are considered to be one of the preferred cathode materials for hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 郅晓科刘红光叶学海何爱珍章甦时洁王旭阳
Owner CHINA NAT OFFSHORE OIL CORP