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Carbon negative electrode material of sodium ion battery

A carbon anode material, a technology for sodium ion batteries, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of ineffective insertion and extraction of sodium ions, and lack of sodium intercalation anode materials.

Inactive Publication Date: 2012-10-03
WUHAN UNIV
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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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  • Carbon negative electrode material of sodium ion battery
  • Carbon negative electrode material of sodium ion battery
  • Carbon negative electrode material of sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1. Polyphenylene pyrolytic carbon and electrochemical sodium storage performance

[0020] Place the polyphenylene material in a high-temperature furnace filled with nitrogen, at 1000 o C was pyrolyzed for 6h, and the resulting carbon material was analyzed by transmission electron microscopy and X-ray structure. Viewed from the transmission electron microscope (attached figure 1 ) carbon layers are arranged in an irregular form with an interlayer spacing of about 0.37 nm, X-ray analysis (attached figure 2 ) is less graphitized, but the peaks of (002) and (101) planes can still be clearly distinguished (respectively at 24.3 o and 44.4 o ). The 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 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...

Embodiment 2

[0022] Embodiment 2. Preparation and sodium storage performance of phenolic resin pyrolytic carbon material

[0023] Place the phenolic resin material in a high-temperature furnace filled with nitrogen at 1200 o C pyrolysis for 2 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, Figure 4 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). like Figure 4 The material shown has a reversible capacity of 260mAh g -1 , the capacity still maintains 220 mAh g after 100 cycles -1 .

[002...

Embodiment 3

[0025] Example 3. Preparation of pitch pyrocarbon and its sodium storage performance

[0026] Place the asphalt material in a high-temperature furnace filled with nitrogen at 600 o C pyrolysis for 24 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 reversible capacity of the tested material is 175mAh g -1 , the capacity still maintains 150 mAh g after 100 cycles -1 .

[0027]

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Abstract

The invention discloses a negative electrode material of a sodium ion battery. The negative electrode material is a carbon material with large interlayer spacing and is obtained by pyrolyzing aromatic organic matters. The interlayer spacing of the prepared carbon material is greater than 0.35 nanometers, which is suitable for the de-intercalation of sodium ions. The material has reversible sodium ion de-intercalation property and is especially hopeful to become a cheap and environment-friendly negative electrode material of the sodium ion battery.

Description

[0001] technical field [0002] The invention relates to a negative electrode material of a sodium ion battery, and 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 e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/38C01B32/05
CPCY02E60/12Y02E60/10
Inventor 曹余良杨汉西钱江峰艾新平
Owner WUHAN UNIV
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