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Modified perfluorocarbon battery and methods for preparing positive electrode pieces and positive electrode materials for modified perfluorocarbon battery

A technology of permanent fluorinated carbon and positive electrode materials, applied in the field of preparation of modified carbon fluorinated batteries and their positive electrode sheets and positive electrode materials, can solve large energy loss, large discharge/charge potential difference, poor cycle stability, etc. problems, to achieve the effect of improved reactivity, simple modification method and low cost

Inactive Publication Date: 2018-04-24
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But similar to conventional conversion reactions, Na / CF x The discharge / charge potential difference of the system is relatively large (about 2V), resulting in large energy loss and poor cycle stability

Method used

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  • Modified perfluorocarbon battery and methods for preparing positive electrode pieces and positive electrode materials for modified perfluorocarbon battery
  • Modified perfluorocarbon battery and methods for preparing positive electrode pieces and positive electrode materials for modified perfluorocarbon battery
  • Modified perfluorocarbon battery and methods for preparing positive electrode pieces and positive electrode materials for modified perfluorocarbon battery

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preparation example Construction

[0022] The invention provides a method for preparing a modified carbon fluoride cathode material, which comprises the following steps: first dispersing the carbon fluoride material in a solvent to form a dispersion liquid; then heating the dispersion liquid, and keeping the heating reaction for a period of time, During this process, the method is kept stirring; after the heating reaction is completed, the method is ultrasonicated, dried, and the solvent is evaporated to prepare the modified carbon fluoride cathode material.

[0023] Preferably, the fluorinated carbon material is one or more of fluorinated graphite, fluorinated carbon fiber, fluorinated carbon nanodisc, fluorinated coke or fluorinated mesocarbon sphere; the fluorinated carbon material The fluorocarbon molar ratio is 0.33-1.2.

[0024] Preferably, the solvent is one or more of N-methylpyrrolidone, isopropanol, acetone or N,N-dimethylformamide.

[0025] Preferably, the concentration of the carbon fluoride materi...

Embodiment 1

[0040] Preparation of modified fluorinated carbon cathode material: Weigh 300 mg of fluorinated mesocarbon microspheres (fluorocarbon molar ratio ~0.86), disperse them in 200 ml of isopropanol, and stir to form a uniform solution. React at 60°C for 10h, after cooling down to room temperature, sonicate for 1.5h, and blow dry at 80°C for 12h.

[0041]Preparation of modified carbon fluoride positive pole piece: Take 12.5mg of polyvinylidene fluoride (PVDF), dissolve it in 1.5ml of N-methylpyrrolidone (NMP), stir to form a uniform solution, and add 100mg of modified carbon fluoride mesophase in turn Carbon microspheres, 12.5 mg of superconducting carbon black conductive agent, prepared modified carbon fluoride positive electrode slurry after stirring for 8 hours, coated on ordinary aluminum foil, and dried at 100 ° C.

[0042] Preparation of modified carbon fluoride battery: The prepared modified carbon fluoride positive electrode was punched into circular pole pieces of Φ14mm, an...

Embodiment 2

[0044] Preparation of modified carbon fluoride cathode material: Weigh 200 mg of fluorinated graphite (fluorocarbon molar ratio ~0.7), disperse in 400 ml of N-methylpyrrolidone (NMP), and stir to form a uniform solution. React at 90°C for 10h, after cooling down to room temperature, sonicate for 2h, and blow dry at 100°C for 20h. The microscopic morphology of the modified carbon fluoride material is as follows: figure 2 and image 3 shown.

[0045] Preparation of modified carbon fluoride positive pole piece: Take 15mg of polyvinylidene fluoride (PVDF), dissolve it in 2ml of N-methylpyrrolidone (NMP), stir to form a uniform solution, add 105mg of modified fluorinated graphite, 30mg of superconducting The carbon black conductive agent was stirred for 8 hours to prepare a carbon fluoride positive electrode slurry, which was coated on the corroded aluminum foil and dried at 100°C.

[0046] Preparation of unmodified carbon fluoride positive pole piece: take 15mg of polyvinylide...

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Abstract

The invention discloses a modified perfluorocarbon battery and methods for preparing positive electrode pieces and positive electrode materials for the modified perfluorocarbon battery. The method forpreparing the positive electrode materials for the modified perfluorocarbon battery includes steps of dispersing perfluorocarbon materials in solvents to form dispersion liquid; heating the dispersion liquid, keeping carrying out heating reaction for a period of time and constantly stirring the dispersion liquid in the procedures; carrying out ultrasound treatment and drying after heating reaction is completed, and evaporating the solvents to obtain the modified perfluorocarbon positive electrode materials. The modified perfluorocarbon positive electrode materials are porous and amorphous positive electrode materials with few layers. The modified perfluorocarbon battery and the methods have that the positive electrode materials are porous and are large in specific surface area, and the reaction activity can be improved; the positive electrode materials have the few layers, and accordingly ion transmission distances can be shortened; modification processes are simple and are low in cost, and obvious effects can be realized; the battery energy efficiency of the modified perfluorocarbon battery can be enhanced as compared with unmodified perfluorocarbon batteries, the cycle stabilitycan be improved, and the modified perfluorocarbon battery has a broad application prospect.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a modified carbon fluoride battery and a method for preparing a positive pole piece and a positive pole material thereof. Background technique [0002] With the continuous development of secondary chemical power sources, room temperature sodium reversible batteries have gradually entered the sight of researchers and attracted widespread attention. In sodium secondary batteries, high specific energy systems are still a research hotspot. Graphite fluoride (CF x ) The theoretical specific capacity is 865mAh / g (x=1), in lithium primary battery, Li / CF x The actual specific energy of the battery can reach 560Wh / kg, and it has been successfully commercialized. In room temperature sodium battery system, Na / CF x The system is reversible and has a certain discharge platform and specific capacity. But similar to conventional conversion reactions, Na / CF x The discharge / c...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/08H01M4/04H01M6/16
CPCH01M4/0404H01M4/08H01M4/5835H01M6/16
Inventor 刘雯郭瑞王勇李永裴海娟解晶莹
Owner SHANGHAI INST OF SPACE POWER SOURCES
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