Microencapsulated carbon-coated carbon fluoride cathode material and preparation method thereof

A technology of carbon fluoride coating and microencapsulation, which is applied in the direction of battery electrodes, primary batteries, electrochemical generators, etc., can solve the problems of reduced specific surface area, easy aggregation of particles, and influence on the power density of electrode materials and the utilization rate of active materials. , to achieve the effect of large specific surface area, not easy to agglomerate, and conducive to electron transport

Inactive Publication Date: 2015-12-16
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon-coated fluorinated carbon prepared by this method is easy to agglomerate the particles and reduce the specific surface area, which affects the power density and active material utilization of electrode materials.

Method used

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  • Microencapsulated carbon-coated carbon fluoride cathode material and preparation method thereof
  • Microencapsulated carbon-coated carbon fluoride cathode material and preparation method thereof
  • Microencapsulated carbon-coated carbon fluoride cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take fluorinated graphite with a fluorine-to-carbon ratio of 1.0, with a particle size of 5-10μm, and use interfacial polymerization to coat it with microencapsulated carbon. The specific process is:

[0028] First use the interfacial polymerization method to coat a layer of polyurea on the surface of the fluorocarbon. The specific process is as follows:

[0029] (1) Mixed

[0030] Add 0.1 g of surfactant alkylphenol polyoxyethylene ether (OP-10) into 100 mL of distilled water, and stir evenly with a glass rod. Add 2g of fluorinated graphite and stir until the mixture is uniform.

[0031] (2) Emulsification

[0032] Weigh 2 g of isophorone diisocyanate (IPDI) into the solution of step (1), stir with a high-speed stirrer under 2000 rpm stirring conditions for 15 minutes to form an oil / water mixed phase emulsion.

[0033] (3) Aggregation

[0034] Place the solution of step (2) in a constant temperature water bath at 40° C., with a stirring speed of 500 rpm, add 0.05 g of dibutyl tin...

Embodiment 2

[0044] Take fluorinated graphite with a fluorocarbon ratio of 1.0, and the particle size is 5-10μm.

[0045] Firstly, a layer of gum arabic-gelatin is coated on the surface of carbon fluoride by complex coacervation method. The specific process is:

[0046] (1) Configuration solution

[0047] Add 1g of gelatin and 1g of gum arabic into 100mL of distilled water, add 0.1g of OP-10 surfactant and 0.1g of polyvinyl alcohol (PVA) as surfactants, stir evenly, stir evenly and adjust the pH to 8.0; then add 4g of fluorocarbon Add to the solution and stir until well mixed.

[0048] (2) Emulsification

[0049] The solution prepared in step (1) is placed in a constant temperature water bath at 50° C. and stirred at 600 rpm for 15 minutes to form a microemulsion.

[0050] (3) Crosslinking and curing

[0051] The solution of step (2) was gradually adjusted to pH 4.7 with 5% mass fraction of acetic acid solution within 30 minutes, and reacted for 1 hour; then the temperature was reduced to 5°C, and 10...

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Abstract

The invention discloses a microencapsulated carbon-coated carbon fluoride cathode material and a preparation method thereof. The cathode material is formed by coating the surfaces of carbon fluoride particles with a layer of carbon. The preparation method comprises the following steps: firstly coating the surfaces of carbon fluoride particles with a layer of an organic matter to prepare carbon fluoride microcapsule particles by microencapsulation technologies such as an interfacial polymerization method and a complex coacervation method; and then preparing the carbon-coated carbon fluoride cathode material by a high-temperature carbonization or concentrated sulfuric acid carbonization technology. The carbon-coated carbon fluoride cathode material prepared by the method is uniform in particles and good in conductivity; particle agglomeration can be avoided; the battery discharge voltage can be improved; and the rate discharge property is improved.

Description

Technical field [0001] The invention relates to a preparation method of a microencapsulated carbon-coated carbon fluoride positive electrode material, which belongs to the field of battery positive electrode materials, in particular to the field of primary battery positive electrode materials. Background technique [0002] In the past ten years, with the rapid development of electronic information technology, the battery, which is one of the important power sources, also has better performance requirements. Among them, the application of primary batteries in military, advanced medical, aerospace and other fields is also increasing. At present, the most commonly used primary batteries are lithium-manganese dioxide batteries and alkaline zinc-manganese batteries, while the theoretical specific capacity of manganese dioxide cathode materials is only 308mAhg -1 , Apply it to a pacemaker, it can only last 3 years. The theoretical specific capacity of fluorocarbon cathode material can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M6/00
CPCH01M4/366H01M4/582H01M4/625H01M6/00
Inventor 潘勇朱岭雷维新周洁李磊马增胜
Owner XIANGTAN UNIV
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