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Oxygen and nitrogen co-doped graded porous carbon nanosheet electrode material as well as preparation method and application thereof

A technology of hierarchical porous and electrode materials, which is applied in nanotechnology, nanotechnology, battery electrodes, etc. for materials and surface science, can solve problems such as poor rate performance, and achieve simple preparation methods, low cost, and rich doping Effect

Inactive Publication Date: 2018-04-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the general biomass hard carbon materials have low heteroatom doping content, and most of them are irregular bulk structures, which show poor rate performance when used as anode materials for sodium-ion batteries.

Method used

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  • Oxygen and nitrogen co-doped graded porous carbon nanosheet electrode material as well as preparation method and application thereof
  • Oxygen and nitrogen co-doped graded porous carbon nanosheet electrode material as well as preparation method and application thereof
  • Oxygen and nitrogen co-doped graded porous carbon nanosheet electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 10 g bovine bone particles into a porcelain boat and place in a tube furnace, under the protection of an inert atmosphere, at 2.5 °C min -1 The temperature was raised to 400 °C and kept at this temperature for 3 h. After the tube furnace was lowered to room temperature, the heat-treated product was taken out and mixed with KOH at a ratio of 1:1.4. The mixture was added to a corundum porcelain boat and placed in a tube furnace under the protection of an inert atmosphere at 2.5 °C min -1 The temperature was raised to 550 °C and kept at this temperature for 1 h. After the tube furnace was lowered to room temperature, the heat-treated product was taken out and soaked in 1 M dilute hydrochloric acid for 12 h, and then washed with deionized water until neutrally dried to obtain a nitrogen-oxygen co-doped hierarchical porous carbon nanosheet electrode material ( figure 1 and 2 ). Its specific surface area is 890 m 2 g -1 , the pore volume is 0.48 cm3 g -1 , The ni...

Embodiment 2

[0037] The operating conditions are the same as in Example 1, except that the animal bones used are fish scales. The obtained nitrogen-oxygen co-doped hierarchical porous carbon nanosheet electrode material has a specific surface area of ​​810 m 2 g -1 , the pore volume is 0.42 cm 3 g -1 , The nitrogen content is 6.9 at.%, the oxygen content is 18.1 at.%, and the carbon layer spacing is 0.42 nm.

[0038] Adopt the method identical with embodiment 1 to carry out electrochemical test, the result shows, current density is 0.7 A g -1 After 1000 cycles, the specific capacity can still be maintained at 190 mAh g -1 , with a current density of 7 A g -1 After 10,000 cycles, the specific capacity can still be maintained at 125 mAh g -1 The reversible specific capacities under step current density are 195, 181, 150, 128, 115, 105 mAh g -1 .

Embodiment 3

[0040] Operating condition is the same as embodiment 1, and difference is 2.5 ° C min of heating rate -1 . The obtained nitrogen-oxygen co-doped hierarchical porous carbon nanosheet electrode material has a specific surface area of ​​905 m 2 g -1 , the pore volume is 0.50 cm 3 g -1 , The nitrogen content is 6.8 at.%, the oxygen content is 18.5 at.%, and the carbon layer spacing is 0.40 nm.

[0041] Adopt the method identical with embodiment 1 to carry out electrochemical test, the result shows, current density is 0.7 A g -1 After 1000 cycles, the specific capacity can still be maintained at 188 mAh g -1 , with a current density of 7 A g -1 Under the same conditions, the specific capacity can still be maintained at 123 mAh g after 10,000 cycles -1 The reversible specific capacities under step current density are 195, 182, 154, 125, 113, 102 mAh g -1 .

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Abstract

The invention relates to an oxygen and nitrogen co-doped graded porous carbon nanosheet electrode material as well as a preparation method and an application thereof. The preparation method comprisesthe following steps: mixing animal bones, scales, shells, metal alkali or metal salt; carrying out thermal treatment in a low temperature condition of 250-650 DEG C; and then carrying out acid pickling to obtain the electrode material. The material is composed of the carbon nanosheets, has graded porous structures of micropores, mesopores and macropores, and has the characteristics of being many in defect, large in carbon interlamellar spacing, high in specific surface area, rich in doped oxygen and nitrogen atoms and the like. The electrode material serving as a cathode of a sodium ion capacitor has a high reversible capacity and excellent cycling stability and rate capability.

Description

technical field [0001] The invention relates to a hierarchical porous carbon nanosheet electrode material co-doped with nitrogen and oxygen, a preparation method thereof, and an application in a sodium ion battery. Background technique [0002] With the rapid development of human science and technology, energy and environmental problems are gradually emerging, and the storage and use of green energy put forward higher requirements for a new generation of energy storage devices. As one of the energy storage devices, sodium-ion batteries have attracted extensive attention due to the abundant sodium resources and low cost. However, the large ionic size of Na ions makes the anode materials suitable for Li-ion batteries exhibit poor Na storage activity. Therefore, the design and development of new electrode materials for sodium-ion batteries with low cost, high capacity, excellent stability and rate performance is of great significance for the large-scale use of sodium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/583H01M10/054Y02E60/10
Inventor 王峰牛津梁晶晶张正平窦美玲
Owner BEIJING UNIV OF CHEM TECH
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