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Preparation method of modified carbon fluoride positive electrode material

A technology of positive electrode material and carbon fluoride, applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve problems such as restricting the use of lithium/carbon fluoride batteries, affecting battery discharge performance, and increasing battery internal resistance. Achieve the effect of improving rate discharge performance, improving voltage hysteresis at the initial stage of discharge, and reducing internal resistance

Inactive Publication Date: 2016-11-23
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

Method used

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  • Preparation method of modified carbon fluoride positive electrode material
  • Preparation method of modified carbon fluoride positive electrode material

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preparation example Construction

[0019] A method for preparing a modified carbon fluoride positive electrode material, comprising the following preparation steps:

[0020] (1) Selection of raw materials: including fluorocarbons, additional carbon sources, and binders;

[0021] (2) Preparation of modified carbon fluoride cathode material: After mixing fluoride carbon, additional carbon source and binder according to a certain proportion, the material is subjected to carbothermal reduction treatment under nitrogen atmosphere for a certain period of time, and the obtained material after cooling is The modified carbon fluoride cathode material in the present invention.

Embodiment 1

[0022] Embodiment 1: fluorinated graphite with a mass ratio of 9:0.7:0.3, carbon source and binder are subjected to carbothermal reduction treatment, the reaction temperature is 450°C, and the reaction time is 4h. After the treatment is completed, it is prepared by the present invention Modified fluorocarbon materials. The modified fluorinated carbon material prepared in the present invention is selected to be bonded to an aluminum current collector and coated with a conductive agent to form a positive electrode. The content of modified fluorocarbon 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, and the content is 7%. The positive electrode sheet is paired with the metal lithium sheet to form a lithium / carbon fluoride battery.

Embodiment 2

[0023] Embodiment 2: fluorinated graphite with a mass ratio of 8.5:1:0.5, carbon source and binder are subjected to carbothermal reduction treatment, the reaction temperature is 450°C, and the reaction time is 4h. After the treatment is completed, it is prepared by the present invention Modified fluorocarbon materials. The modified fluorinated carbon material prepared in the present invention is selected to be bonded to an aluminum current collector and coated with a conductive agent to form a positive electrode. The content of modified fluorocarbon 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, and the content is 7%. The positive electrode sheet is paired with the metal lithium sheet to form a lithium / carbon fluoride battery.

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Abstract

The invention discloses a method for preparing a modified carbon fluoride positive electrode material, which comprises the following preparation steps: (1) selecting raw materials: including carbon fluoride, additional carbon source, and binder; (2) modifying the carbon fluoride positive electrode Material preparation: Mix fluorocarbons, additional carbon sources and binders according to a certain proportion, put them into a sintering furnace under a nitrogen atmosphere, control the reaction temperature in the furnace, carry out carbothermal reduction treatment on the materials for a certain period of time, and then cool down to obtain The material is the modified carbon fluoride cathode material in the present invention. The present invention utilizes carbothermal reduction method to process fluorinated carbon, improves the electronic conductivity of the material, reduces the internal resistance and polarization phenomenon of the lithium / carbon battery during discharge, and improves the initial voltage hysteresis of the lithium / carbon fluorinated battery. Rate discharge performance.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, in particular to a method for preparing a modified carbon fluoride cathode material 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 / carbon 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 solid carbon fluoride materials, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M6/14
CPCH01M4/5835H01M6/14
Inventor 张亮张红梅魏俊华王庆杰石斌万伟华杨中发赵洪楷
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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