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Long-acting circulating sodium carbon fluoride secondary battery and preparation method thereof

A sodium fluoride carbon, secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of poor cycle performance of liquid electrolyte, improve cycle stability, simplify the preparation method, and improve safety Effect

Inactive Publication Date: 2020-11-24
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the defect of poor cycle performance of the liquid electrolyte in the prior art, by using a sodium ion solid electrolyte instead of the liquid electrolyte, the electrolyte material selects polyvinylidene fluoride as the matrix, and its chemical compatibility with the metal sodium electrode it is good

Method used

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  • Long-acting circulating sodium carbon fluoride secondary battery and preparation method thereof
  • Long-acting circulating sodium carbon fluoride secondary battery and preparation method thereof
  • Long-acting circulating sodium carbon fluoride secondary battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of sodium ion solid electrolyte: Dissolve 0.3g of polyvinylidene fluoride in 15mL of dimethylformamide. After the polyvinylidene fluoride is completely dissolved, add 0.1g NaTFSI, stir thoroughly for 4 hours, add 0.09g alumina, and stir overnight. The casting method is adopted to form a film, and the specific implementation method is: the above solution is poured into a mold, and the film is formed by vacuum heating at 60° C., and the vacuum degree is -0.1 MPa. Microscopic appearance such as figure 1 shown. The voltage stability test results are as follows figure 2 As shown, when the voltage is lower than 4.7V, the electrolyte is in a stable state. Therefore, when the positive electrode voltage is lower than 4.7V, the sodium ion solid electrolyte prepared by the present invention is suitable for a sodium fluoride secondary system and has good electrochemical stability.

[0040] Preparation of positive electrode sheet: take 5mg of graphene oxide, dispers...

Embodiment 2

[0044] Preparation of sodium ion solid electrolyte: Dissolve 0.3g of polyvinylidene fluoride in 15mL of dimethylformamide. After the polyvinylidene fluoride is completely dissolved, add 0.1g NaTFSI, stir well for 4 hours, then add 0.09g NaTFSI 3 Zr 2 Si 2 PO 12 , stirred overnight. The casting method is adopted to form a film, and the specific implementation method is: the above solution is poured into a mold, and the film is formed by vacuum heating at 60° C., and the vacuum degree is -0.1 MPa. Microscopic appearance such as Figure 5 shown.

[0045] Preparation of the positive electrode sheet: 100 mg of polyvinylidene fluoride was dissolved in 3 ml of N-methylpyrrolidone (NMP), and stirred to form a uniform solution. Add 800 mg of carbon fluoride mesocarbon microspheres and 100 mg of superconducting carbon black conductive agent into the solution, and stir for 8 hours to prepare a carbon fluoride cathode active material slurry. The fluorinated carbon cathode active ma...

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Abstract

The invention discloses a long-acting cyclic sodium carbon fluoride secondary battery and a preparation method, the long-acting cyclic sodium carbon fluoride secondary battery comprises a positive electrode, a negative electrode and an electrolyte, the electrolyte is a sodium ion solid electrolyte, and the sodium ion solid electrolyte is prepared from polyvinylidene fluoride, a sodium ion conductor and a sodium salt; the active material of the positive electrode is carbon fluoride, and the negative electrode is metal sodium. The sodium ion solid electrolyte membrane prepared by the invention belongs to a flexible membrane, selects the polyvinylidene fluoride as a matrix, has good chemical compatibility with a metal sodium negative electrode, and can be used without adding an isolation layer. The sodium-ion solid electrolyte is used for replacing a liquid electrolyte, so that the safety of a sodium-carbon fluoride secondary battery can be effectively improved, and meanwhile, the cyclingstability is improved. The preparation method is simple and energy-saving.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a sodium fluoride carbon secondary battery with a long-term cycle using a solid electrolyte. Background technique [0002] Fluorinated carbon cathode materials are widely used in lithium primary batteries due to their excellent characteristics such as high specific capacity, electrochemical stability, and stable discharge platform. In recent years, carbon fluoride cathode materials have been used in room temperature sodium secondary batteries (W.Liu, H.Li, J.-Y.Xie, Z.-W.Fu, ACS Appl. Mater. Interfaces 2014, 6, 2209; W .Liu, Z.Shadike, Carbon, 93, 2015, 523; Y. Shao, H. Yue, Chem. Mater. 2016, 28, 1026), magnesium primary battery (X. Miao, J. Yang, W. Pan , H. Yuan, Y. Nuli, S.-i. Hirano, Electrochim. Acta 2016) attracted attention. But currently Na / CF x The liquid electrolyte used in the system has potential safety hazards; and in the liquid electrolyte, it is easy to cause the loss of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M4/38H01M4/583H01M10/054
CPCH01M4/381H01M4/5835H01M10/054H01M10/0565H01M2300/0082Y02E60/10
Inventor 刘雯颜廷房王勇解晶莹杨旸郭瑞李永裴海娟
Owner SHANGHAI INST OF SPACE POWER SOURCES
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