Positive electrode material for ultrahigh-power-density lithium carbon fluoride battery and preparation method and application of positive electrode material

A positive electrode material and power density technology, applied in the battery field, can solve problems affecting battery capacity performance and application limitations, and achieve the effects of reducing battery resistance, reducing ion transmission resistance, and reducing reaction polarization

Inactive Publication Date: 2019-10-25
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, because the electronic conductivity of fluorinated carbon is restricted by the degree of fluorination, it affects the capacity performance of the battery under high-current working conditions, and its application in high-power devices is limited.

Method used

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  • Positive electrode material for ultrahigh-power-density lithium carbon fluoride battery and preparation method and application of positive electrode material
  • Positive electrode material for ultrahigh-power-density lithium carbon fluoride battery and preparation method and application of positive electrode material
  • Positive electrode material for ultrahigh-power-density lithium carbon fluoride battery and preparation method and application of positive electrode material

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[0028] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0029] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0031] The steps for preparing the ultra-high power density lithium carbon fluoride battery described in the present invention are as follows:

[0032] Step 1: Add 0.8g of super conductive carbon black and 20g of polyvinylidene fluoride solution with a mass fraction of 5% into a mixer and mix for 30 minutes. The solvent in the polyvinylidene fluoride solution is nitrogen methylpyrrolidone;

[0033] Step 2: Add 8g fluorinated graphene and 70g nitrogen methyl pyrrolidone, stir and mix for 1h, then add 0.2g nano-carbon fiber and mix for 6h to make a uniform positive electrode slurry, wherein the fluorine content of fluorinated graphene is 52% by mass , the specific surface area is 260m 2 / g;

[0034] Step 3: Apply the obtained positive electrode slurry evenly on the carbon-coated aluminum foil by doctor blade coating, with a coating thickness of 150 μm;

[0035] Step 4: Dry at 110°C under normal pressure for 1 hour, then vacuum-dry at 110°C for 8 hours to make a positive electr...

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Abstract

The invention relates to a positive electrode material for an ultrahigh-power-density lithium carbon fluoride battery and a preparation method and application of the positive electrode material. The positive electrode material is prepared by mixing the following raw materials in percentage by mass: 80% of a carbon fluoride active material; 8% of a super-conductive carbon black; 2% of carbon nanofibers; and 10% of polyvinylidene fluoride. According to the preparation method, the positive electrode material is improved through a two-step conductive agent mixing method, and carbon-coated aluminumfoil is adopted as a positive electrode current collector, so that the discharge current density of the prepared lithium carbon fluoride battery is improved to be greater than 40A/g, and the ultrahigh power density is realized. Specifically, a carbon fluoride active material with a high specific surface area is used as an active material, so that the liquid absorption and liquid retention capabilities of the positive electrode material on an electrolyte are remarkably improved, and the ion transmission resistance and reaction polarization are reduced. The positive electrode material is improved by adopting a method of mixing the conductive agent by a two-step method, so that the conductive agent and the carbon fluoride active material are in full contact, and the positive electrode material is uniformly mixed.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium carbon fluoride battery with an ultra-high power density, a preparation method and an application thereof, and belongs to the technical field of batteries. Background technique [0002] With the continuous development of the sharing economy and the mobile economy, people have higher and higher performance requirements for portable mobile power supplies, and various portable electronic product supporting power supplies are developing in the direction of high specific energy, high power, long storage life, and high safety. Due to its excellent performance, lithium primary batteries are widely used in various civil and military fields such as sensors, cameras, cardiac pacemakers, and aircraft. Currently common lithium primary batteries include lithium manganese dioxide batteries, lithium thionyl chloride batteries, lithium sulfur dioxide batteries, lithium carbon fluoride batteries, lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/587H01M4/62H01M4/66H01M4/08B82Y30/00
CPCB82Y30/00H01M4/08H01M4/362H01M4/5835H01M4/587H01M4/625H01M4/661H01M4/663H01M4/667
Inventor 彭思侃王晨燕绍九王继贤
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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