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High-power charging and discharging lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, batteries, secondary batteries, etc., can solve the problems of poor safety performance, unsatisfactory high current performance, etc., and achieve the effect of high charge and discharge power and high safety

Active Publication Date: 2017-10-20
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor safety performance and unsatisfactory high-current performance of existing lithium-ion battery cathode materials, and provide a high-power, high-safety lithium-ion cathode material suitable for the electric vehicle industry and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] High power charge and discharge lithium ion battery cathode material Li 2 Fe 2 (MoO 4 ) 3 The preparation method is as follows:

[0021] 1) Weigh 404g of Fe(NO 3 ) 3 9H 2 O (1mol) was added to 1L deionized water to prepare a 1mol / L solution, and 363g (1.5mol) Na was weighed 2 MoO 4 2H 2 O was added with 1.5L deionized water to prepare a 1mol / L aqueous solution. The two solutions were mixed and stirred evenly, wherein the molar ratio of sodium molybdate and ferric nitrate was 3:2, and the pH of the solution was adjusted to 0.8. The mixed solution was transferred to a reaction kettle, the temperature was gradually raised to 200° C., and the reaction was maintained for 4 hours. After the hydrothermal reaction is completed, the reaction product is suction-filtered and washed several times, and then dried at 80° C. to obtain iron molybdate powder with a grain size of 0.5-10 microns.

[0022] 2) Dissolve 133g of lithium iodide in 1L of acetonitrile solvent to obtai...

Embodiment 2

[0025] High power charge and discharge lithium ion battery cathode material Li 2 Fe 2 (MoO 4 ) 3 The preparation method is as follows:

[0026] 1) Weigh 40.4g of Fe(NO 3 ) 3 9H 2 O (0.1mol) was added to 1L deionized water to prepare a 0.1mol / L solution, and 36.3g (0.15mol) Na was weighed 2 MoO 4 2H 2 O was added with 1.5L deionized water to prepare a 0.1mol / L aqueous solution. The two solutions were mixed and stirred evenly, wherein the molar ratio of sodium molybdate and ferric nitrate was 3:2, and the pH of the solution was adjusted to 1.5. Transfer the mixed solution to a reaction kettle, gradually raise the temperature to 160° C., and keep the temperature for 24 hours. After the hydrothermal reaction is completed, the reaction product is suction-filtered and washed several times, and then dried at a low temperature of 100° C. to obtain iron molybdate powder with a grain size of 0.5-5 microns.

[0027] 2) Dissolve 133g of lithium iodide in 500mL of acetonitrile t...

Embodiment 3

[0030] High power charge and discharge lithium ion battery cathode material Li 2 Fe 2 (MoO 4 ) 3 The preparation method is as follows:

[0031] 1) Weigh 40.4g of Fe(NO 3 ) 3 9H 2 O (0.1mol) was added to 0.5L deionized water to prepare a 0.2mol / L solution, and 36.3g (0.15mol) Na was weighed 2 MoO 4 2H 2 O was added with 1L of deionized water to prepare a 0.15mol / L aqueous solution. The two solutions were mixed and stirred evenly, wherein the molar ratio of sodium molybdate and ferric nitrate was 3:2, and the pH of the solution was adjusted to 1. The mixed solution was transferred to a reaction kettle, the temperature was gradually raised to 180°C, and the reaction was kept for 12 hours. After the hydrothermal reaction is completed, the reaction product is suction-filtered and washed several times, and then dried at 100° C. to obtain iron molybdate powder with a grain size of 0.5-10 microns.

[0032] 2) Dissolve 133g of lithium iodide in 5L of acetonitrile to obtain a 0...

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Abstract

The invention relates to a high-power charging and discharging lithium ion battery positive electrode material Li2Fe2(MoO4)3 and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing a sodium molybdate aqueous solution with a ferric nitrate aqueous solution in the molar ratio of 3 to 2; regulating the pH of the mixed solution to 0.8 to 1.5, and heating to 160 to 200 DEG C to perform a hydrothermal reaction in order to obtain iron molybdate (Fe2(MoO4)3) powder as a precursor; then, adding the iron molybdate powder into an organic solution (acetonitrile or dimethyl formamide) containing lithium iodide (LiI) for refluxing; separating to obtain a high-activity Li2Fe2(MoO4)3 electrode material. Prepared lithium iron molybdate is taken as the lithium ion battery positive electrode material, has the advantages of high charging and discharging power, stable material performance, high safety and the like, and is suitable for the field of high power output of electric automobiles and the like.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a high-power charge-discharge lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have many advantages such as high discharge voltage, high capacity, no memory effect, small size and excellent cycle performance, so they are widely used in many civil and military fields such as mobile phones, digital cameras, notebook computers, and electronic instruments. Materials are one of the main factors affecting battery cost and performance. The currently used positive electrode materials are mainly lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium ferrous phosphate and their modified varieties, but there are some problems, such as lithium cobalt oxide and lithium nickel oxide have poor cycle performance and safety performance. Lithium iron phosphate has poor electronic conductivity, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M10/0525
CPCH01M4/485H01M4/525H01M10/0525H01M2220/20Y02E60/10
Inventor 林志东罗京朱春花付萍陈喆
Owner WUHAN INSTITUTE OF TECHNOLOGY
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