Method of modifying carbon fluoride cathode material through chemical reduction process

A technology of permanent fluorinated carbon and positive electrode materials, applied in the field of preparation of modified carbon fluorinated positive electrode materials by chemical reduction method, can solve problems such as restricting the use of lithium/carbon fluoride batteries, affecting battery discharge performance, and increasing internal resistance of batteries , to improve rate discharge performance, improve discharge initial voltage hysteresis, and reduce internal resistance

Inactive Publication Date: 2018-04-27
GUIZHOU MEILING POWER SUPPLY CO LTD
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Problems solved by technology

When fluorinated carbon is used as the positive electrode material of the battery, its low electronic conductivity will increase the polarization of the battery when the battery is discharged, causing an increase in the internal resistance of the battery, affecting the discharge performance of the battery, and seriously restricting the lithium / carbon fluoride battery. usage of

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  • Method of modifying carbon fluoride cathode material through chemical reduction process
  • Method of modifying carbon fluoride cathode material through chemical reduction process

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preparation example Construction

[0018] A method for preparing a modified carbon fluoride positive electrode material, comprising the following preparation steps:

[0019] (1) Selection of raw materials: including fluorocarbons, chemical reducing agents, and solvents;

[0020] (2) Preparation of modified carbon fluoride cathode material: After mixing fluoride carbon, chemical reducing agent, and solvent according to a certain proportion, the material is subjected to chemical reduction treatment for a certain period of time under heating and stirring conditions, and the obtained material is based on cooling and filtering The modified carbon fluoride cathode material in the invention.

Embodiment 1

[0022] The mass ratio is: 1:1:2 fluorinated graphite, chemical reducing agent and solvent are subjected to chemical reduction treatment, reaction temperature is 25 ℃, reaction time is 4h, after treatment finishes filtering is the modified fluorinated graphite prepared by the present invention. carbon material. The carbon fluoride material prepared in the present invention is selected to be bonded with a conductive agent to be coated on an aluminum current collector to form a positive electrode. The content of fluorinated carbon material is 88%. The conductive agent can be conductive carbon black and carbon nanotubes, and the total content of the conductive agent is 5%. The type of binder is styrene-butadiene rubber and sodium carboxymethyl cellulose with a content of 7%, and the positive electrode sheet is paired with the metal lithium sheet to form a lithium fluoride battery.

Embodiment 2

[0024] The mass ratio is: 1:1.2:3 fluorinated graphite, chemical reducing agent and solvent are subjected to chemical reduction treatment, the reaction temperature is 25 ℃, the reaction time is 4h, after the treatment finishes filtering is the modified fluorinated graphite prepared by the present invention. carbon material. The carbon fluoride material prepared in the present invention is selected to be bonded with a conductive agent to be coated on an aluminum current collector to form a positive electrode. The content of fluorinated carbon material is 88%. The conductive agent can be conductive carbon black and carbon nanotubes, and the total content of the conductive agent is 5%. The type of binder is styrene-butadiene rubber and sodium carboxymethyl cellulose with a content of 7%, and the positive electrode sheet is paired with the metal lithium sheet to form a lithium fluoride battery.

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Abstract

The invention discloses a method of modifying a carbon fluoride cathode material through a chemical reduction process. The method includes the steps of: (1) raw material selection: preparing carbon fluoride, a chemical reducing agent and a solvent; (2) preparation of the modified carbon fluoride cathode material: according to certain ratio, mixing the carbon fluoride, the chemical reducing agent and the solvent, and performing chemical reduction treatment for a certain time under a heating and stirring condition, and cooling and filtering the product to obtain the modified carbon fluoride cathode material. In the invention, the carbon fluoride is treated through the chemical reduction method, thus increasing the electronic conductivity of the material. During discharge, a lithium / carbon fluoride battery is reduced in internal resistance and polarization phenomenon, thus reducing a problem of voltage delay during initial stage of discharge and improving rate discharge performance of thelithium / carbon fluoride battery.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, in particular to a method for preparing a carbon fluoride positive electrode material modified by a chemical reduction method technical background: [0002] Lithium primary batteries have many excellent properties and characteristics, including high voltage, high specific energy, wide operating temperature range, long storage life, etc. Currently commonly used lithium primary batteries mainly include lithium manganese dioxide batteries, lithium thionyl chloride batteries, lithium / carbon fluoride batteries and lithium sulfur dioxide batteries. Among them, lithium fluoride is the system with the highest theoretical specific energy, about 2180Wh kg -1 , and due to the stable chemical and physical properties of carbon fluoride, the positive electrode material, the battery has a long storage life and good high-temperature performance. Therefore, the preparation and modification of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/08
CPCH01M4/08H01M4/5835
Inventor 张亮张红梅魏俊华王庆杰万伟华陈铤
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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