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Preparation method of high-specific-energy fluorinated graphene lithium battery

A fluorinated graphene and graphene battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of small specific gravity and low conductivity, and achieve the effects of mild reaction process, excellent conductivity and high energy density

Inactive Publication Date: 2019-05-28
SHANDONG ZHONGSHAN PHOTOELECTRIC MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Compared with other fluorinated carbon materials, the electrochemical performance of fluorinated graphene is the best among fluorinated carbon materials, but at the same time, highly fluorinated graphene also has the problems of low conductivity and small specific gravity.

Method used

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  • Preparation method of high-specific-energy fluorinated graphene lithium battery
  • Preparation method of high-specific-energy fluorinated graphene lithium battery
  • Preparation method of high-specific-energy fluorinated graphene lithium battery

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preparation example Construction

[0029] Preparation of new fluorinated graphene: put thermally reduced graphene with 10% oxygen content in a closed reaction furnace, and pass through F 2 / N 2 Gas mixture (F 2 The volume fraction is 2%), and the temperature was raised to 150 °C for 24 h at a heating rate of 10 °C / min to obtain the crude fluorinated graphene product. Then it was treated with KOH solution with a mass concentration of 5%, washed with deionized water four times, and baked at 110 °C for 12 h to obtain fluorinated graphene. After granulation and crushing, the tap density is 0.5 ~ 1.0 g / cm 3 , a new type of fluorinated graphene with a particle size of 10-20um. Among them, the purity of the new fluorinated graphene was measured to be 99.5%, and the content of fluorine element was 58%.

[0030] Preparation of high specific energy fluorinated graphene battery: N-methylpyrrolidone (NMP) is used as solvent, the new fluorinated graphene is used as positive electrode active material, and conductive agen...

Embodiment 1

[0033] The prepared 3.5g fluorinated graphene powder was put into a powder tablet press for compression molding, then transferred to a pulverizer for pulverization, and sieved to obtain a tap density of 0.5 g / cm 3, a new type of fluorinated graphene with a particle size (D50) of 10um; then, using NMP as a solvent, take 3g of the above-mentioned new type of fluorinated graphene, and 0.25g of carbon black, 0.125g of carbon nanotubes, and 0.375g of PVDF according to a mass ratio of 8 : 1:1 for homogenization, vacuum drying at 80°C for 12 hours, and pressing on the aluminum mesh by a roller press to obtain the positive electrode; then Celgard 2400 is used as the separator, lithium sheet is used as the negative electrode, and HR6066 is used as the electrolyte to assemble a fluorinated graphene battery .

[0034] The discharge platform of the fluorinated graphene battery was measured at 2.81V at a current density of 20 mA / g, and the specific energy was 741 mAh / g (cut-off voltage ≥ 2...

Embodiment 2

[0036] The prepared 3.5g fluorinated graphene powder was put into a powder tablet press for compression molding, then transferred to a pulverizer for pulverization, and sieved to obtain a tap density of 0.5 g / cm 3 , a new type of fluorinated graphene with a particle size (D50) of 10um; then, using NMP as a solvent, take 3g of the above-mentioned new type of fluorinated graphene, and 0.235g of carbon black, 0.118g of carbon nanotubes, and 0.353g of PVDF according to a mass ratio of 8.5 :0.75:0.75 for homogenization, vacuum drying at 80°C for 12 hours, and pressing on an aluminum grid by a roller press to obtain a positive electrode; then use Celgard 2400 as a separator, lithium sheet as a negative electrode, and HR6066 as an electrolyte to assemble a fluorinated graphene battery .

[0037] The discharge platform of the fluorinated graphene battery was measured at 2.78V at a current density of 20 mA / g, and the specific energy was 779 mAh / g (cut-off voltage ≥ 2V).

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Abstract

The invention belongs to the technical field of lithium fluorocarbon batteries, and particularly relates to a preparation method of a high-specific-energy fluorinated graphene lithium battery. The lithium fluorocarbon battery takes novel fluorinated graphene as a positive electrode active material and takes a lithium alloy as a negative electrode material, wherein the novel fluorinated graphene isobtained by taking thermally reduced graphene as a raw material, reacting with a fluorinating agent, treating with an alkali solution, washing and drying, granulating and the like. The novel fluorinated graphene is adopted as the positive electrode active material, and the extremely high specific surface area and excellent conductivity of the fluorinated graphene are utilized, so that the ion diffusion resistance is reduced, the internal resistance is further reduced, and the fluorinated graphene lithium battery has the characteristics of high and stable discharge platform, high specific energy, excellent rate capability and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium carbon fluoride batteries, and in particular relates to a preparation method of a high specific energy fluorinated graphene lithium battery. Background technique [0002] With lithium metal as the negative electrode, carbon fluoride (CF x )n is lithium fluorocarbon (Li-CF x ) The specific energy of the battery (about 2180Wh / Kg) is the highest lithium primary battery in the known solid cathode series. Compared with other lithium primary batteries, lithium fluoride batteries also have the characteristics of stable discharge platform, wide operating temperature range, low self-discharge rate, long storage life, environmental protection and high safety factor, especially suitable for long-term work in unattended or closed Instrument power supply in the environment, especially in aerospace, deep-sea diving, unmanned aerial vehicles, field operations and other applications that require high energy den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587
CPCY02E60/10
Inventor 郭飞飞方治文刘超杨敏李朋飞吕黎崔丽亚焦文慧赵娜
Owner SHANDONG ZHONGSHAN PHOTOELECTRIC MATERIAL CO LTD
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