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High voltage lithium ion battery cathode material and preparation method thereof

A cathode material, lithium ion technology, applied in the field of cathode material of lithium ion battery and its preparation, can solve the problems of high energy consumption and long heating time, and achieve the effects of low consumption, short sintering time and excellent electrochemical performance

Inactive Publication Date: 2013-10-02
WHOLE WIN BEIJING MATERIALS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared lithium nickel manganese oxide material has excellent electrochemical performance, but the heating time is long and energy consumption is high

Method used

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  • High voltage lithium ion battery cathode material and preparation method thereof
  • High voltage lithium ion battery cathode material and preparation method thereof
  • High voltage lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A lithium ion battery positive electrode material is prepared by the following method:

[0032] 1) According to the chemical formula LiNi 0.5 mn 1.475 Cr 0.025 o 3.975 f 0.025 The stoichiometry of Ni(NO 3 ) 2 ·6H 2 O, Cr(NO 3 ) 3 9H 2 O and 50%Mn(NO 3 ) 2 Formulated with a total metal ion concentration of 2mol L -1The mixed solution; Weigh Na 2 CO 3 The same concentration is 2mol L -1 solution; the two solutions are dropped into a reaction tank filled with about 400mL of distilled water at the same time, stir the co-precipitation solution and add NaOH to control the pH value between 7-8. At 55°C, control the rate of addition so that the two solutions are added dropwise in about 2 hours. After the reaction was completed, stirring was continued for 2 h. Wash the precipitate several times, filter it with suction and dry it in a drying oven at 120°C.

[0033] 2) Grind the dried product, put it in a muffle furnace for calcination under air atmosphere, and p...

Embodiment 2

[0036] A lithium ion battery positive electrode material is prepared by the following method:

[0037] 1) According to the chemical formula LiNi 0.475 mn 1.475 co 0.5 o 3.95 f 0.05 The stoichiometry of Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and 50%Mn(NO 3 ) 2 Formulated with a total metal ion concentration of 2mol L -1 The mixed solution; Weigh Na 2 CO 3 The same concentration is 2mol L -1 solution; the two solutions are dropped into a reaction tank filled with about 400mL of distilled water at the same time, stir the co-precipitation solution and add NaOH to control the pH value between 7-8. At 30°C, control the rate of addition so that the two solutions are added dropwise in about 4 hours. After the reaction was completed, stirring was continued for 2 h. Wash the precipitate several times, filter it with suction and dry it in a drying oven at 120°C.

[0038] 2) Grind the dried product, put it in a muffle furnace for calcination under air atmosphere, and p...

Embodiment 3

[0041] A lithium ion battery positive electrode material is prepared by the following method:

[0042] 1) According to the chemical formula LiNi 0.5 mn 1.45 Mg 0.025 Cr 0.025 o 3.95 f 0.05 The stoichiometry of Ni(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Cr(NO 3 ) 3 9H 2 O and 50%Mn(NO 3 ) 2 Formulated with a total metal ion concentration of 2mol L -1 The mixed solution; Weigh Na 2 CO 3 The same concentration is 2mol L -1 solution; the two solutions are dropped into a reaction tank filled with about 400mL of distilled water at the same time, stir the co-precipitation solution and add NaOH to control the pH value between 7-8. At 45°C, control the rate of addition so that the two solutions are added dropwise in about 3 hours. After the reaction was completed, stirring was continued for 2 h. Wash the precipitate several times, filter it with suction and dry it in a drying oven at 120°C.

[0043] 2) Grind the dried product, put it in a muffle furnace for calcina...

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Abstract

The invention provides a high voltage lithium ion secondary battery cathode material, which is represented by a general formula LiNi0.5-xMn1.5-yMx+yFzO4-z. Specifically, M is one or several elements of Mg, Cr, Ti, Co, Al, Fe, Zn and Cu, x is greater than or equal to 0 and smaller than or equal to 0.1, y is greater than or equal to 0 and smaller than or equal to 0.2, Z is greater than or equal to 0 and smaller than or equal to 0.2. The invention also provides a preparation method of the cathode material. The method includes: firstly employing a coprecipitation technique to generate a carbonate precursor of a nickel salt, a manganese salt and an M salt, then mixing the precursor with a lithium salt and LiF, performing ball milling, and carrying out fast microwave sintering to obtain the sample LiNi0.5-xMn1.5-yMx+yFzO4-z. The preparation method has the advantages of simple and controllable production process, short heating time, and low energy consumption, thus being suitable for large-scale industrial production. In the invention, an anion-cation composite doping way is adopted, the advantages of anions and cations are utilized comprehensively, and simultaneously their disadvantages can mutually offset, and the generated synergistic effect can improve the battery performance. The material prepared by the invention has completely developed crystal grains with moderate and uniform size, and has the advantages of high voltage, high capacity, excellent rate performance and high temperature cycle performance, etc.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, belonging to the technical field of lithium batteries. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, and good safety performance. They are widely used in portable electronic products such as mobile communications and notebook computers. With the application of pure electric vehicles, hybrid electric vehicles and large-scale energy storage, People have put forward higher requirements on the performance of lithium-ion batteries, especially the energy density and power density. The energy density of the battery is related to the specific capacity and working voltage of the battery, so it is of great significance to seek high-voltage and high-capacity lithium-ion battery cathode materials. [0003] Currently used cathode materials for lithium-ion batteries, such as LiCoO 2 , LiMn 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/525H01M4/505
CPCY02E60/10
Inventor 张沛龙张亚媛葛静
Owner WHOLE WIN BEIJING MATERIALS SCI & TECH
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