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Lithium secondary battery with metal fluoride as positive electrode material

A technology for lithium secondary batteries and positive electrode materials, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of low energy consumption, complicated preparation process, and difficult realization in the preparation process, and achieve simple preparation methods and high Coulombic efficiency , The effect achieved by the reaction conditions

Active Publication Date: 2012-01-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the defects of complex preparation process, high cost and difficult realization of the existing lithium secondary battery using metal fluoride as the positive electrode material, the object of the present invention is to provide a lithium secondary battery using metal fluoride as the positive electrode material. The preparation method of the secondary battery is simple, the reaction conditions are easy to realize, the raw materials are easy to obtain, the preparation process consumes less energy, the safety is good, and it has good electrochemical performance

Method used

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  • Lithium secondary battery with metal fluoride as positive electrode material
  • Lithium secondary battery with metal fluoride as positive electrode material
  • Lithium secondary battery with metal fluoride as positive electrode material

Examples

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Embodiment 1

[0034] 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 -1Aqueous 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.

[0035] 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 temper...

Embodiment 2

[0039] 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), during this process, the solution in the flask is mechanically stirred, and precipitation occurs. After the reaction is over, stop stirring, and then suction filter to obtain the precipitate. , the precipitate was washed twice with deionized water and then 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.

[0040] The ferric hydroxide and copper hydroxide mixture is placed in the container of polytetrafluoroethylene material, then the HF solution of 20ml mass fraction 40% is added wherein rapidly (the material of ferric hydroxide and copper hydroxide mixture and hydrofluoric acid The volume ratio is 1:10), and seal the container. During this ...

Embodiment 3

[0044] Take 0.1molL -1 FeCl 3 Solution 100ml, placed in a flask, then 150ml concentration is 0.3molL -1 The KOH solution was slowly added into the flask (the molar ratio of alkali to metal salt was 4.5:1), and during this process the solution in the flask was magnetically stirred, and precipitation occurred. After the reaction was over, the magnetic stirring was stopped, and then suction filtered to obtain Precipitation, the precipitate was washed once with methanol, and then washed twice with distilled water. The precipitate was dried in vacuum at 120°C for 1 h to obtain ferric hydroxide.

[0045] 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. Af...

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Abstract

The invention which discloses a lithium secondary battery with a metal fluoride as a cathode material belongs to the technical field of environmentally friendly secondary batteries. The lithium secondary battery is characterized in that: the lithium secondary battery comprises a positive electrode, a negative electrode, a membrane, an electrolyte or a polymer dielectric, a current collector, a positive electrode shell, and a negative electrode shell; the membrane or the polymer dielectric immersed with the electrolyte separates the positive electrode and the negative electrode; the positive electrode material which is coated on the current collector is connected with the positive electrode shell of the battery; the negative electrode is connected with the negative electrode shell of the battery; the positive electrode shell and the negative electrode shell mutually insulate; the positive electrode comprises the metal fluoride, a conductive agent, a binder, and the current collector; and the positive electrode material is the metal fluoride, and the chemical composition of the positive electrode material is MFa(H2O)b, wherein a is equal to or less than 3 and equal to or more than 1, and b which is equal to or less than 4 and equal to or more than 0 is an integer. The lithium secondary battery of the present invention has the advantages of simple preparation method, easily realized reaction condition, easily available raw material, low energy consumption in the preparation process, good security, and good electrochemical performance.

Description

technical field [0001] The invention relates to a lithium secondary battery using metal fluoride as a positive electrode material, which belongs to the technical field of green secondary batteries, in particular to the field of lithium secondary batteries with a multi-electron system. Background technique [0002] The increasingly severe energy problem and the popularization of portable electronic products such as notebooks, mobile phones, and digital cameras have given the battery industry great room for development. Lithium secondary batteries are favored by the world because of their advantages such as high voltage, high energy density, and good cycle performance. However, the cost of commercialized lithium secondary batteries is high, and the capacity density and power density are difficult to meet the needs of the environment-friendly and energy-saving vehicles that the world pursues, such as hybrid electric vehicles and pure electric vehicles. Therefore, it is urgent t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/136H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 吴锋吴川李肖肖白莹庞春会陈实吴伯荣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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