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a self-supporting na x mno 2 Array sodium ion battery cathode material and preparation method thereof

A technology for sodium ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of limited related research, achieve simple synthesis process, low preparation cost, and easy The effect of the operation

Active Publication Date: 2021-06-18
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the currently reported Na x MnO 2 The materials are only limited to powder materials, and the related research is quite limited, about Na x MnO 2 There are few reports on the related research of array materials, so the Na x MnO 2 It is of great significance to conduct in-depth research on sodium ion cathode array materials

Method used

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  • a self-supporting na <sub>x</sub> mno <sub>2</sub> Array sodium ion battery cathode material and preparation method thereof
  • a self-supporting na <sub>x</sub> mno <sub>2</sub> Array sodium ion battery cathode material and preparation method thereof
  • a self-supporting na <sub>x</sub> mno <sub>2</sub> Array sodium ion battery cathode material and preparation method thereof

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Embodiment 1

[0017] Nickel foam (2×4cm 2 ) placed in 100 mL of oxalic acid dihydrate (H 2 C 2 o 4 2H 2 O) Ultrasound for 10 min. Then 50mL of potassium permanganate solution with a concentration of 0.1M was slowly dropped into the above solution and fully stirred for 30min. Finally, the nickel foam was taken out and annealed at 350°C for 2 hours in the air atmosphere to obtain Mn 2 o 3 nanoarray. Wherein the nickel foam leans against the hydrothermal kettle at an angle of 60°. The reacted array was placed in a 2M NaOH solution at 120°C for 10 h and dried, then placed in air and annealed at 600°C for 3 h to obtain Na 0.7 MnO 2 Nanosheet arrays. figure 1 For the prepared Na 0.7 MnO 2 The SEM image of the nanosheet array, it can be seen that Na 0.7 MnO 2 (x=0.7) The nanosheets are evenly distributed in the field of view, and the average width of the nanosheets is 1 μm. figure 2 For the prepared Na 0.7 MnO 2 XRD patterns of nanosheet arrays. It can be seen that except for th...

Embodiment 2

[0019] Nickel foam (2×4cm 2 ) placed in 100mL of 0.5M oxalic acid dihydrate (H 2 C 2 o 4 2H 2 O) Ultrasound for 10 min. Then 50mL of potassium permanganate solution with a concentration of 0.1M was slowly dropped into the above solution and fully stirred for 30min. Finally, the nickel foam was taken out and annealed at 350°C for 2 hours in the air atmosphere to obtain Mn 2 o 3 nanoarray. Wherein the nickel foam leans against the hydrothermal kettle at an angle of 60°. The reacted array was placed in a 2M NaOH solution at 80°C for 10 h and dried, then placed in air and annealed at 600°C for 3 h to obtain Na 0.7 MnO 2 Nanosheet arrays. Figure 5 In order to prepare the SEM image of the array, it can be seen that the nanosheets are evenly distributed in the field of view, and the average width of the nanosheets is about 0.5 μm. Assembled it into a Na-ion half-cell, and did not see obvious Na x MnO 2 Charge and discharge voltage platform ( Figure 6 ). This is due t...

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Abstract

The invention provides a self -supported NA x MNO 2 (0 <x ≤1) Preparation method of array. Na x MNO 2 The width of the nano -sheet is 1 to 2 μm, the thickness is 4 to 8 μm, and the amount of activity of the nickel online unit area is about 1.0 to 1.5mg · cm ‑2 Essence NA x MNO 2 The electrode material of sodium ion battery is based on two -water oxalic acid and potassium permanganate. The MN obtained by burning in the air after ultrasound is treated 2 O 3 Nano array. To get NA x MNO 2 Array, the Mn obtained above 2 O 3 The array was placed in high concentration of sodium hydroxide for water heat reaction, and then annealing in the air to get NA x MNO 2 Array. NA x MNO 2 The sodium ion battery composed of the positive electrode material has excellent percentage and circulation performance, and has 82mAh G under 6C current density ‑1 The capacity of the ratio is 87.8 % after the circulation is 500 times. From Na x MNO 2 The sodium ion semi -battery compiled by the positive chip has a stable cycle performance and has potential application value in sodium ion batteries.

Description

technical field [0001] The invention relates to a novel self-supporting nano-array sodium-ion battery material, in particular to a sheet-like structure of Na x MnO 2 The invention discloses a method for preparing a nanosheet array material, belonging to the field of sodium ion batteries. [0002] technical background [0003] With the current development of energy storage devices, lithium-ion battery energy storage devices are beginning to play an increasingly important role in our daily lives. At present, lithium-ion batteries are mainly used in portable electronic products such as mobile phones, digital cameras, and notebooks. However, the application in large-scale transportation equipment such as electric vehicles still faces many difficulties. One of the challenges is the cost issue. Due to the limited reserves of lithium resources on the earth, and lithium is an essential raw material for lithium-ion batteries, the cost problem is the main reason for limiting the larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M10/054B82Y30/00
CPCB82Y30/00H01M4/505H01M10/054Y02E60/10
Inventor 高林陈思杨学林
Owner CHINA THREE GORGES UNIV