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Nanocrystalline iron-silicon alloy-based positive electrode material and preparation method thereof

A positive electrode material, iron-silicon alloy technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of low energy density and no obvious improvement in the initial efficiency of lithium-ion batteries, so as to improve energy density, optimize discharge capacity and Effect of cycle life and structural stability

Pending Publication Date: 2022-04-15
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first efficiency of this low-temperature lithium-ion battery has not been significantly improved, and the energy density is low, and the low-temperature performance of lithium-ion batteries needs to be further improved

Method used

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  • Nanocrystalline iron-silicon alloy-based positive electrode material and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] A nanocrystalline iron-silicon alloy-based positive electrode material, the preparation method comprising the following steps:

[0026] (1) Add the positive electrode material and nanocrystalline iron-silicon alloy powder into deionized water, and keep stirring, the stirring speed is 700r / min; the positive electrode material is LiNi 0.83 co 0.12 mn 0.05 o 2 ;

[0027] (2) Add 2mol / L lithium hydroxide solution to the solution obtained in step (1), stir continuously, the stirring speed is 500r / min, the stirring time is 40min, and the pH of the mixed solution is controlled=11±0.5;

[0028] (3) The mixed solution in step (2) is suction filtered, washed, and dried in an oven;

[0029] Among them, ethanol is used in the washing process, the temperature of the oven is set to 100°C, and the time is set to 9h;

[0030] (4) mixing the positive electrode material after step (3) drying with a dispersant and ball milling;

[0031] Wherein, the dispersant is polyvinylpyrrolidon...

Embodiment 2

[0041] A nanocrystalline iron-silicon alloy-based positive electrode material, the preparation method comprising the following steps:

[0042] (1) Add the positive electrode material and nanocrystalline iron-silicon alloy powder into deionized water, and keep stirring, the stirring speed is 800r / min; the positive electrode material is LiNi 0.92 co 0.05 mn 0.03 o 2 ;

[0043] (2) The lithium carbonate solution of 3mol / L is added in the solution that step (1) obtains, constantly stirs, and stirring speed is 600r / min, and stirring time is 30min, and the pH=12+0.5 of controlling mixed solution;

[0044] (3) The mixed solution in step (2) is suction filtered, washed, and dried in an oven;

[0045] Among them, the washing process uses deionized water, the temperature of the oven is set to 150°C, and the time is set to 2h:

[0046] (4) mixing the positive electrode material after step (3) drying with a dispersant and ball milling;

[0047] Wherein, the dispersant is polyethylen...

Embodiment 3

[0057] A nanocrystalline iron-silicon alloy-based positive electrode material, the preparation method comprising the following steps:

[0058] (1) Add positive electrode material and nanocrystalline iron-silicon alloy powder into deionized water, and keep stirring at a stirring speed of 600r / min; the positive electrode material is LiNi 0.95 co 0.02 mn 0.03 o 2 ;

[0059] (2) Add 1mol / L lithium hydroxide solution to the solution obtained in step (1), stir continuously, the stirring speed is 400r / min, the stirring time is 50min, and the pH of the mixed solution is controlled=9.5±0.5;

[0060] (3) The mixed solution in step (2) is suction filtered, washed, and dried in an oven;

[0061] Among them, the washing process uses deionized water, the temperature of the oven is set at 50°C, and the time is set at 16h;

[0062] (4) mixing the positive electrode material after step (3) drying with a dispersant and ball milling;

[0063] Wherein, the dispersant is hydroxypropyl cellul...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a nanocrystalline iron-silicon alloy-based positive electrode material, which comprises the following steps: (1) adding a positive electrode material and nanocrystalline iron-silicon alloy powder into deionized water, and stirring; the positive electrode material is LiNixCoyMn (1-x-y) O2, x is more than or equal to 0.82 and less than 1, and y is more than 0 and less than or equal to 0.18; (2) adding an alkaline solution of lithium salt into the solution obtained in the step (1), and stirring; (3) carrying out suction filtration, washing and drying on the mixed solution in the step (2); (4) mixing and ball-milling the positive electrode material dried in the step (3) and a dispersing agent; and (5) drying the ball-milled powder, putting the dried powder into a tubular furnace, preserving heat, cooling, grinding and sieving to obtain the nanocrystalline iron-silicon alloy-based positive electrode material for the lithium ion battery. According to the nanocrystalline iron-silicon alloy-based positive electrode material disclosed by the invention, the energy density, the cycle performance and the low-temperature performance of a lithium ion battery are improved, and the performances such as the discharge capacity and the cycle life are optimized.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nanocrystalline iron-silicon alloy-based positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, light weight, long life and no memory effect, and are widely used in various civilian electronic equipment and electric vehicles, energy storage, mobile power and other fields. With the promotion and popularization of electric vehicles, more and more power batteries are used in electric vehicles. A typical problem faced by power lithium-ion batteries is that the mileage in winter is sharply reduced, and the use of lithium batteries in low-temperature environments is limited. In addition to the serious decline in discharge capacity, lithium batteries cannot be charged at low temperatures. Although some new energy vehicles will preheat the battery pack befo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/505H01M4/525H01M10/0525
Inventor 周翠芳张仁柏刘昊陈彬张萍郁星星沈胜利徐达
Owner TIANNENG SAFT ENERGY JOINT CO
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