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Metal fluoride cathode material for lithium secondary battery and preparation method thereof

A lithium secondary battery and positive electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high risk and high energy consumption, and achieve the effect of simple method, low energy consumption and high specific capacity

Active Publication Date: 2011-12-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are energy-intensive and highly dangerous

Method used

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  • Metal fluoride cathode material for lithium secondary battery and preparation method thereof
  • Metal fluoride cathode material for lithium secondary battery and preparation method thereof
  • Metal fluoride cathode material for lithium secondary battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take 0.1molL -1 FeCl 3 Solution 100ml, placed in a flask, then 150ml concentration is 0.3molL -1 Slowly add the KOH solution in the flask (the mass ratio of the alkali to the metal salt is 4.5: 1), in the process the solution in the flask is magnetically stirred, precipitation occurs, the reaction is over, the magnetic stirring is stopped, and then pumping The precipitate was obtained by filtration, and the precipitate was washed once with methanol and then twice with distilled water. The washed precipitate was dried in vacuum at 120° C. for 1 h to obtain ferric hydroxide.

[0032]The ferric hydroxide was placed in a container made of polytetrafluoroethylene, and then 20ml of 40% HF solution by mass fraction was quickly added therein (the molar ratio of ferric hydroxide to hydrofluoric acid was 1:9), and Seal the container. During this process, the solution in the container was magnetically stirred and kept in a constant temperature water bath of 60°C. After fully r...

Embodiment 2

[0035] Take 0.1molL -1 Fe(NO 3 ) 3 50ml of the solution was placed in a flask, and then the 60ml concentration was 0.3molL -1 Aqueous ammonia was slowly added into the flask (the molar ratio of base to metal salt was 3.6:1). During this process, the solution in the flask was ultrasonically oscillated, and precipitation appeared. After the reaction was completed, the ultrasonic oscillation was stopped, and then the precipitate was obtained by suction filtration. The precipitate was first washed twice with deionized water, and then washed once with methanol. The washed precipitate was dried in vacuum at 120° C. for 1 h to obtain ferric hydroxide.

[0036] Place the ferric hydroxide in a container made of polytetrafluoroethylene, then quickly add 12ml of 40% HF in mass fraction (the molar ratio of ferric hydroxide to hydrofluoric acid is 1: 10), and seal it the container. During this process, the solution in the container was magnetically stirred and kept in a constant tempe...

Embodiment 3

[0040] Take 0.1molL respectively -1 CuCl 2 Solution 20ml and 0.1molL -1 FeCl 3 Solution 80ml, placed in a flask, then 100ml concentration is 0.3molL -1 Slowly add the KOH solution in the flask (the mass ratio of alkali to metal salt is 3: 1), in the process, the solution in the flask is mechanically stirred, precipitation occurs, the reaction ends, the stirring is stopped, and then suction filtration A precipitate was obtained, which was washed twice with deionized water and once with acetone. The washed precipitate was dried in vacuum at 40° C. for 12 h to obtain a mixture of ferric hydroxide and copper hydroxide.

[0041] The iron hydroxide and copper hydroxide mixture are placed in the container of polytetrafluoroethylene material, then the HF solution of 15ml mass fraction 40% is added therein quickly (the material of iron hydroxide and copper hydroxide mixture and hydrofluoric acid The volume ratio is 1:10), and seal the container. During this process, the solution i...

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Abstract

The invention discloses a metal fluoride cathode material of a lithium secondary battery and a preparation method of the cathode material, which belong to the fields of green secondary batteries and related energy materials, particularly the field of multi-electron lithium secondary battery materials, and solve the problem of high energy consumption and risk of the conventional preparation methodof metal fluoride. The chemical composition of the cathode material is MFa(H2O)b, wherein a is more than or equal to 1 and less than or equal to 3, and b is more than or equal to 0 and less than or equal to 4 and is an integer. The preparation method of the cathode material comprises the following steps of: (1) reacting alkali with soluble metal salt to obtain metal hydroxide or metal oxide; (2) reacting the metal hydroxide or metal oxide obtained in the step (1) with hydrofluoric acid to obtain solution; and (3) drying the solution obtained in the step (2) to obtain the cathode material. Thecathode material has high electrochemical property and is environment-friendly; and the preparation method is simple, the energy consumption in the preparation process is low, reaction conditions areeasy to implement, and raw materials are easy to obtain.

Description

technical field [0001] The invention relates to a lithium secondary battery metal fluoride cathode material and a preparation method thereof, belonging to the field of green secondary batteries and related energy materials, in particular to the field of lithium secondary battery materials of a multi-electronic system. Background technique [0002] The shortage of energy and the deterioration of the environment have made lithium secondary batteries, which are environmentally friendly and highly energy efficient, have entered the stage of history as a new energy technology, but the current commercial lithium secondary batteries are difficult to meet the high There is a large demand for energy density batteries, and how to improve the reversible capacity of cathode materials is one of the technical bottlenecks in the development of lithium secondary batteries. Therefore, it is particularly important to look for cathode materials for lithium secondary batteries with high energy ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/36H01M4/1397H01M4/139
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 吴川吴锋李肖肖白莹庞春会陈实胡文龙杨立伟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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