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Pitch carbon coated fluorocarbon cathode material and preparation method thereof

A carbon fluoride-coated, positive electrode material technology, applied to battery electrodes, organic electrolyte batteries, electrical components, etc., can solve problems such as uneven mixing, environmental pollution of organic solvents, and large amount of modifiers

Active Publication Date: 2017-12-15
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The blending modification method has the problem of uneven blending, and the coating modification has the problem of organic solvent environmental pollution, and the amount of modifier added by the two is large, and there is a situation in which the specific capacity of fluorinated carbon is exchanged for high rate performance.

Method used

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  • Pitch carbon coated fluorocarbon cathode material and preparation method thereof
  • Pitch carbon coated fluorocarbon cathode material and preparation method thereof
  • Pitch carbon coated fluorocarbon cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh pitch and carbon fluoride according to the mass of carbon in pitch accounting for 1% of the mass of carbon fluoride, mix the two, and then heat-treat at 500°C for 2 hours in a nitrogen atmosphere; cool and sieve to obtain pitch carbon-coated fluoride carbon cathode material.

[0023] Test the discharge performance of the pitch carbon-coated carbon fluoride cathode material obtained in this embodiment in a 2032-type button cell;

[0024] The composition of the electrode material is: the weight ratio of pitch carbon-coated carbon fluoride positive electrode material to conductive agent SP and binder PVDF is 90:5:5; the counter electrode is metal lithium; the electrolyte is 1mol / L LiPF 6 EC / DMC (1:1 by volume) solution; the membrane is Cellgard 2400 microporous membrane. The current density of the battery test is 0.1C and 1C, and the discharge voltage range is 3-1.5V.

Embodiment 2

[0026] Weigh pitch and carbon fluoride according to the mass of carbon in pitch accounting for 5% of the mass of carbon fluoride, mix the two, and then heat-treat at 400°C for 5 hours in an argon atmosphere; cool and sieve to obtain pitch carbon-coated fluorine carbonized cathode material.

[0027] According to the method in Example 1, the discharge performance of the pitch carbon-coated carbon fluoride positive electrode material obtained in this example in a 2032-type button battery was tested.

Embodiment 3

[0029] Weigh pitch and carbon fluoride according to the mass of carbon in pitch accounting for 2% of the mass of carbon fluoride, mix the two, and then heat-treat at 400°C for 8 hours in a nitrogen atmosphere; cool and sieve to obtain pitch carbon-coated fluoride carbon cathode material.

[0030] According to the method in Example 1, the discharge performance of the pitch carbon-coated carbon fluoride positive electrode material obtained in this example in a 2032-type button battery was tested.

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Abstract

The invention discloses a pitch carbon coated fluorocarbon cathode material and a preparation method thereof. The preparation method comprises the following steps: mixing fluorocarbon with pitch, performing heat treatment on the obtained mixture and sieving the mixture to obtain the pitch carbon coated fluorocarbon cathode material. According to the method, fluorocarbon is coated with pitch carbon, and by improving binding force between the fluorocarbon surface and a carbon source, the electric conductivity of the material is improved to a greater extent, so that the discharge voltage plateau, specific capacity and high-current discharge performance of the material are improved substantially. The method has the advantages of low cost, simple equipment, simple and easily controllable process conditions, high yield and the like and is quite suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium primary battery materials, in particular to a pitch carbon-coated carbon fluoride positive electrode material and a preparation method thereof. Background technique [0002] As a cathode material for lithium primary batteries, carbon fluoride has the advantages of high specific capacity, wide operating temperature range, high operating voltage, and long storage time, and has become a hot research material to replace manganese dioxide cathode materials. However, the C-F bonds in fluorocarbons exist in the form of covalent bonds, resulting in extremely low conductivity, poor rate performance, and severe heat generation during discharge, which limits their large-scale applications. Therefore, people are devoting themselves to blending and modifying carbon fluoride or coating modification to improve the conductivity of the material and solve the urgent problems such as poor rate performance of carbon ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M6/16
CPCH01M4/366H01M4/5835H01M4/625H01M6/16
Inventor 徐宁梁运辉李磊
Owner TIANJIN B&M SCI & TECH
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