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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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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[0030] Example 1

[0031] Take 0.1molL -1 FeCl 3 Solution 100ml, placed in a flask, and then 150ml concentration was 0.3molL -1 The KOH solution was slowly added to the flask (the substance ratio of the alkali to the metal salt was 4.5:1), and the solution in the flask was magnetically stirred during this process, and precipitation occurred, and the reaction ended, and the magnetic stirring was stopped, and then pumped. The precipitate was obtained by filtration, and the precipitate was washed once with methanol and twice with distilled water. The washed precipitate was dried under 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 20 ml of HF solution with a mass fraction of 40% was quickly added to it (the 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 ...

Example Embodiment

[0034] Example 2

[0035] Take 0.1molL -1 Fe(NO 3 ) 3 Solution 50ml, placed in a flask, and then 60ml concentration was 0.3molL -1 The ammonia water was slowly added to the flask (the substance ratio of alkali 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 precipitation was obtained by suction filtration. The precipitation was washed twice with deionized water and once with methanol. The washed precipitate was dried under vacuum at 120 °C for 1 h to obtain ferric hydroxide.

[0036] The ferric hydroxide was placed in a container made of polytetrafluoroethylene, and then 12 ml of HF with a mass fraction of 40% was quickly added to it (the ratio of ferric hydroxide to hydrofluoric acid was 1:10), and sealed. the container. During this process, the solution in the container was magnetically stirred and ke...

Example Embodiment

[0039] Example 3

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

[0041] The ferric hydroxide and copper hydroxide mixture was placed in a container made of polytetrafluoroethylene, and then 15ml of HF solution with a mass fraction of 40% was quickly added to it (the mixture of ferric hydroxide and copper hydroxide and hydrofluoric acid) The amount ratio is 1:10), and the container is sealed...

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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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