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P2-phase layered oxide, preparation method and application of P2-phase layered oxide in sodium ion battery

A sodium ion battery and oxide technology, applied in battery electrodes, secondary batteries, active material electrodes, etc.

Active Publication Date: 2021-03-19
NANJING UNIV
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Problems solved by technology

Although Ti elements have achieved certain results in the doping of layered materials, Ti elements are directly doped in Na x MnO 2 Materials that tend to form tunnel structures in

Method used

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  • P2-phase layered oxide, preparation method and application of P2-phase layered oxide in sodium ion battery
  • P2-phase layered oxide, preparation method and application of P2-phase layered oxide in sodium ion battery
  • P2-phase layered oxide, preparation method and application of P2-phase layered oxide in sodium ion battery

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Embodiment Construction

[0060] Material preparation and battery assembly

[0061] 1. Material preparation: Na 2 CO 3 (In order to compensate for the loss of sodium at high temperature, Na 2 CO 3 Excess 5wt%), Mn 2 o 3 , CuO(MgO / ZnO), TiO 2 According to a certain stoichiometric ratio, it is added into a ball mill tank, and ball milled for 5 hours at a speed of 300 rpm to fully grind several raw materials and mix them evenly. Then the mixed powder was taken out from the ball mill jar and dried in an oven at 100 °C for 12 h. Take 0.4 g of the dried powder, use a mold with a diameter of 16 mm, press it into tablets, and place it in an alumina crucible. Finally, put the crucible containing the wafer into the tube furnace and heat it at 5°C for min -1 Raise the temperature to 900°C, keep it under an argon / oxygen atmosphere for 15 hours, and then cool it with the furnace until the temperature drops to room temperature, take it out, and grind it to obtain a black-brown powder material.

[0062] 2....

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Abstract

The invention relates to a P2-phase layered oxide, a preparation method and an application of the P2-phase layered oxide in a sodium ion battery, and belongs to the technical field of sodium ion battery materials. The chemical formula of the material is Na0.67Mn<1-2x>MxTixO2, wherein 0 < x < 0.2, and M is selected from Cu, Mg or Zn. According to the preparation method, Mg / Cu / Zn elements and Ti elements are used for replacing Mn elements in the P2-phase Na0.67MnO2 material together, and a series of P2-phase materials are synthesized. The material has large specific capacity. In addition, the material also has good rate capability and cycling stability, and the change of the cell volume in a complete charging / discharging process is only 3.2%. For production and storage problems, the method also has important significance for practical application of the layered positive electrode oxide material for the sodium-ion battery.

Description

technical field [0001] The invention relates to a P2 phase layered oxide, a preparation method and an application in a sodium ion battery, belonging to the technical field of sodium ion battery materials. Background technique [0002] Lithium-ion batteries have been widely used in fields such as portable electronic devices and electric vehicles. With the expansion of the electric vehicle market, it will inevitably lead to the rapid consumption of lithium resources. In addition, the uneven distribution of lithium resources around the world has led to an increase in the cost of lithium-ion batteries. These factors greatly limit the application of lithium-ion batteries in large-scale energy storage systems. 1,2 As a promising alternative to Li-ion batteries, Na-ion batteries have attracted increasing attention due to their high abundance in the Earth's crust and low cost. 3-5 Among them, layered oxides are currently the research focus of cathode materials for sodium-ion batt...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/131H01M4/1391H01M10/054
CPCH01M4/505H01M4/628H01M4/1391H01M4/131H01M10/054H01M2004/028H01M2004/021Y02E60/10
Inventor 郭少华张雪苹柏佩来周豪慎
Owner NANJING UNIV
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