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Sodion battery cathode material

A sodium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of less sodium-intercalated negative electrode materials and the inability to effectively insert and extract sodium ions

Active Publication Date: 2012-10-03
SHENZHEN JANAENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are relatively few studies on sodium intercalation negative electrode materials, mainly limited to the small interlayer spacing (0.335 nm) of graphite materials with good lithium intercalation properties, and sodium ions with large ionic radius cannot be effectively intercalated and extracted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1. Polyvinyl chloride pyrolytic carbon and electrochemical sodium storage performance

[0022] Place the polyvinyl chloride material in a high-temperature furnace filled with nitrogen, at 600 o C pyrolysis 6h. The obtained carbon material is uniformly mixed with vinylidene fluoride (PVDF) (dissolved in N-methylpyrrolidone) and acetylene black at a weight ratio of 90:5:5, and coated to form an electrode film. With the electrode film as the working electrode and the metal sodium sheet as the counter electrode, 1mol L -1 NaPF 6 (EC-DEC=1:1) Assembled the battery with the electrolyte to test its electrochemical performance, figure 1 The galvanostatic charge-discharge curve of polyvinyl chloride pyrolytic carbon. Such as figure 1 shown at 50 mA g -1 Under the current density, the reversible capacity of the material is 200mAh g -1 . After 100 cycles of battery cycling, 90% of the capacity is still maintained. ( figure 2 )

Embodiment 2

[0023] Example 2. Preparation and sodium storage performance of polythiophene pyrolytic carbon material

[0024] Place the polythiophene material in a high-temperature furnace filled with nitrogen, at 1200 o C pyrolysis for 10 hours, the obtained carbon material is mixed with vinylidene fluoride (PVDF) (dissolved in N-methylpyrrolidone) and acetylene black in a weight ratio of 90:5:5, and coated into an electrode film. With the electrode film as the working electrode and the metal sodium sheet as the counter electrode, 1mol L -1 NaPF 6 (EC-DEC=1:1) Assembled the battery with the electrolyte to test its electrochemical performance, image 3 It is the galvanostatic cycle performance curve of phenolic resin pyrolytic carbon, the current density is 50 mA g -1 , the charging and discharging voltage range is 2.0~0V (Na + / Na). Such as image 3 The material shown has a reversible capacity of 170mAh g -1 . Figure 4 is the cycle curve of the material. The capacity still main...

Embodiment 3

[0026] Embodiment 3. Preparation and sodium storage performance of polyaniline pyrolytic carbon

[0027] Place the polyaniline material in a high-temperature furnace filled with nitrogen, at 1000 o C pyrolysis for 6 hours, the obtained carbon material is mixed with vinylidene fluoride (PVDF) (dissolved in N-methylpyrrolidone) and acetylene black in a weight ratio of 90:5:5, and coated into an electrode film. With the electrode film as the working electrode and the metal sodium sheet as the counter electrode, 1mol L -1 NaPF 6 (EC-DEC=1:1) Assembled the battery with the electrolyte to test its electrochemical performance, the current density was 50 mA g -1 , the charging and discharging voltage range is 1.2~0V (Na + / Na). The tested material has a reversible capacity of 250 mAh g -1 , the capacity still maintains 220 mAh g after 100 cycles -1 .

[0028]

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Abstract

The invention discloses a sodion battery cathode material, which is an ion-doped carbon material, wherein the carbon material is from pyrolytic carbon of various organic matter materials; the prepared carbon material has the ion doping property and can provide a suitable sodion de-intercalation channel; and the sodion battery cathode material has reversible sodion de-intercalation performance and is very hopeful to become a sodion battery cathode material which is low in cost and environment-friendly.

Description

[0001] technical field [0002] The invention relates to a negative electrode material of a sodium ion battery, which belongs to the technical field of energy storage materials and secondary batteries. Background technique [0003] With the development of society and the continuous increase of population, the global energy demand continues to increase, and the consumption of fossil energy is also increasing year by year. The energy structure that strongly relies on fossil energy has brought two problems to social development. One is that fossil energy cannot be regenerated in a short period of time, leading to increasingly serious energy shortages; the other is the greenhouse effect and environmental pollution caused by the massive consumption of fossil energy. getting worse. Therefore, solving resource and environmental problems has become two important issues related to the sustainable development of human society. Obviously, vigorously developing and utilizing renewable...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/134H01M10/054
CPCY02E60/122Y02E60/10
Inventor 曹余良杨汉西钱江峰艾新平
Owner SHENZHEN JANAENERGY TECH CO LTD
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