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High-voltage sodium-carbon fluoride secondary battery

A secondary battery, carbon fluoride technology, applied in the direction of secondary batteries, battery electrodes, electrochemical generators, etc., can solve the problems of unstable discharge platform, poor cycle performance, low discharge voltage, etc., and achieve good cycle stability , large discharge capacity and high discharge potential

Active Publication Date: 2015-04-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the previous patents, the fluorinated carbon material of the positive electrode of the sodium-carbon fluoride battery is mainly fluorinated graphite. The discharge voltage of this material is low, usually lower than 2.5V, and the discharge platform is unstable and the cycle performance is poor.
However, there is no report on the application of multi-layer carbon fluoride materials with high discharge voltage, especially the application of carbon fluoride higher than 2.6V in the field of sodium secondary batteries.
[0006] The theoretical open circuit voltage of fluorinated carbon material is 4.5V, but due to the extremely poor conductivity of the material, the polarization is serious in the application of the battery, so its working voltage is often lower than 2.5V, and the rate performance is poor, often only in the Works at very low current densities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The electrochemical performance test of the high-voltage sodium-carbon fluoride secondary battery of the present invention is carried out by using the prepared 2025 button-type sodium battery, and the positive carbon fluoride electrode is prepared by the paste coating method. The specific steps are to dissolve carbon fluoride, acetylene black and binder in a solvent according to the mass ratio of carbon fluoride positive electrode material: acetylene black: binder = 80:10:10, mix them by ball milling, and apply them on the treated aluminum foil , dried in vacuum at 120°C, and pressed for molding at 30MPa. A positive electrode for a sodium battery was obtained.

[0041] The binder can be polyacrylic acid (PAA), polyvinylidene fluoride (PVDF), LA-132 (produced by Chengdu Yindile Power Technology Co., Ltd.), carboxymethylcellulose sodium salt (CMC), etc. at least one of the

[0042] The solvent is at least one of nitrogen-methylpyrrolidone (NMP), acetone, deionized water...

Embodiment 2

[0044] The fluorinated carbon electrode prepared in Example 1 is used as the positive pole, the sodium metal is the negative pole, the PP / PE / PP composite film Cellgard 2400 and the glass fiber are the diaphragm, and 1mol / L NaClO 4 The mixed solution of ethylene carbonate (EC) and dimethyl carbonate (DMC) (1:1v / v) is the electrolyte, and 2% fluoroethylene carbonate (FEC) additive is added to the electrolyte, and the The box is assembled into a 2025 button battery. The structure principle of sodium battery is as follows figure 1 As shown, each mark is: 1-positive active material; 2-negative active material; 3-positive current collector; 4-negative current collector; 5-diaphragm; 6-electrolyte. The constant current electrochemical performance test was carried out on the LAND battery test system (Wuhan Landian Electronics Co., Ltd.). Discharge cut-off potential is 1.5V (vs.Na + / Na), the charging cut-off potential is 4.8V (vs.Na + / Na) controls the charging capacity.

Embodiment 3

[0046] Using fluorinated acetylene black (F / C=0.53) as the positive electrode active material, referring to Example 1, PVDF was used as the binder, and NMP was used as the solvent to prepare the positive electrode for sodium batteries. Referring to Example 2, the sodium battery preparation and electrochemical performance test were carried out. Test results such as Figure 9 and 10 shown.

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Abstract

The invention discloses a high-voltage sodium-carbon fluoride secondary battery and relates to a secondary battery. The high-voltage sodium-carbon fluoride secondary battery is provided with a positive electrode, a negative electrode, a diaphragm and electrolyte, wherein a carbon fluoride material serves as a positive active material of the positive electrode; a sodium metal negative electrode or a sodium alloy negative electrode serves as the negative electrode; the electrolyte consists of a solvent, electrolyte and an additive; the solvent refers to an organic solution; the electrolyte refers to a sodium salt; and the diaphragm adopts a PP diaphragm, a PE diaphragm, a PP / PE / PP composite film or a glass fiber diaphragm. The fluorinated acetylene black, fluorinated carbon fibers, graphite fluoride microspheres and other materials which are prepared by a high-temperature gas phase chemistry fluorination method, and the secondary battery is high in specific capacity and has high energy density, high reversible capacity, high cycle stability and high rate performance. Moreover, the secondary battery has the advantages of high discharge capacity, high discharge potential, stable discharge potential, certain reversible capacity and the like, can use a water-based adhesive and is environmentally friendly.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a high-voltage sodium-carbon fluoride secondary battery with a novel carbon fluoride material in a multilayer structure as the positive electrode. Background technique [0002] Fluorinated carbon is currently widely used as a cathode material for lithium primary batteries. It has the advantages of high energy density, low self-discharge rate, long storage life and safety, and is widely used in military, aerospace, medical and other fields. [0003] At present, the chemical energy storage technology industry represented by lithium-ion batteries is facing two bottlenecks: performance and price. On the one hand, intercalation-extraction materials represented by lithium cobaltate are approaching the limit of their theoretical capacity, and their performance is increasingly difficult to meet the needs of human daily life, especially small electronic equipment; on the other hand, the cost of lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/054H01M4/583
CPCH01M4/583H01M10/054Y02E60/10
Inventor 杨勇邵元骏岳红军钟贵明龚正良
Owner XIAMEN UNIV
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