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P2-type sodium ion battery layered positive electrode material as well as preparation method and application thereof

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, electrode manufacturing, positive electrodes, etc., can solve the problems of low energy density and poor stability of positive electrode materials, and achieve improved electrochemical performance, good stability, and high energy density Effect

Active Publication Date: 2021-03-12
江西省钒电新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the deficiencies in the prior art, the object of the invention is to provide a kind of P2 type sodium ion battery layered cathode material Na 0.67 Ni x mn y A z o 2 To solve the problems of low energy density and poor stability of this type of cathode material

Method used

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  • P2-type sodium ion battery layered positive electrode material as well as preparation method and application thereof
  • P2-type sodium ion battery layered positive electrode material as well as preparation method and application thereof
  • P2-type sodium ion battery layered positive electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of cathode material Na 0.67 Ni 0.33 mn 0.33 Ti 0.34 o 2 .

[0030] (1) According to Na 0.67 Ni 0.33 mn 0.33 Ti 0.34 o 2 The stoichiometric ratio of each element in the weighing Na 2 CO 3 , NiO, Mn 2 o 3 and TiO 2 In a mortar, grind for 45 min to mix well.

[0031](2) Press the mixture into ceramic tablets under 16 MPa using a tablet press.

[0032] (3) Calcinate the ceramic sheet obtained in step (2) in the air at 1000°C for 15 hours, the heating rate is 5°C / min, and cool to room temperature to obtain P2 type Na 0.67 Ni 0.33 mn 0.33 Ti 0.34 o 2 The cathode material was stored in an argon-filled glove box for future use.

[0033] (2) Assembling the Na-ion battery.

[0034] Assemble the sodium-ion battery with the positive electrode prepared in step (1) and the metallic sodium negative electrode, and the electrolyte contains NaClO 4 , the concentration is 1mol / L, the solvent is a mixed solvent of propylene carbonate (PC) and fluoroeth...

Embodiment 2

[0038] The rest are the same as in Example 1, except that the titanium doping amount of the positive electrode material prepared in step (1) is 10%, and 10% refers to the molar percentage of titanium element in the total transition metal elements, and the prepared positive electrode material is Na 0.67 Ni 0.33 mn 0.57 Ti 0.1 o 2 .

Embodiment 3

[0040] The rest are the same as in Example 1, except that the titanium doping amount of the positive electrode material prepared in step (1) is 20%, and 20% refers to the molar percentage of titanium element in the total transition metal elements, and the prepared positive electrode material is Na 0.67 Ni 0.33 mn 0.47 Ti 0.2 o 2 .

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Abstract

The invention relates to a P2-type sodium ion battery layered positive electrode material as well as a preparation method and application thereof. The positive electrode material is Na0.67NixMnyAZO2,wherein A is one of Ti, Mg, Sn or Bi, x is greater than or equal to 0 and less than or equal to 0.5, y is greater than or equal to 0 and less than or equal to 1, and z is greater than or equal to 0 and less than or equal to 0.5. The preparation method comprises the steps of weighing raw materials according to a stoichiometric ratio by adopting a high-temperature solid-phase method, grinding, pressing into a ceramic chip, calcining in air at high temperature, and cooling to room temperature. The application comprises the steps of uniformly mixing the positive electrode material, conductive carbon black and polyvinylidene fluoride according to a mass ratio ranging from 8: 1: 1 to 6: 3: 1, coating a thin sheet by using an aluminum foil as a current collector, and drying in a vacuum drying oven to form a positive plate; and assembling the sodium ion battery in a glove box filled with argon by taking metal sodium as a negative electrode, GF / D as a diaphragm and a sodium perchlorate electrolyte. The positive electrode material prepared by the invention has a simple phase change process, high energy density and good stability; and the method is simple, easily available in raw materials, low in price, environment-friendly and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of sodium ion battery materials, and in particular relates to a P2 type sodium ion battery layered positive electrode material, a preparation method and an application. Background technique [0002] Due to the rapid consumption of fossil fuels and environmental pollution issues, it is necessary to reduce the use of clean and renewable energy through energy storage technology. Na-ion batteries are considered as a promising energy storage system due to their low cost, good safety performance, and abundant sodium resources, and the development of electrode materials plays an important role in improving their performance. [0003] In fact, more than 60% of the performance of Na-ion batteries is controlled by the cathode material. To date, a large number of cathode materials have been extensively studied, including layered transition metal oxides, polyanionic compounds, and Prussian blue analogs, etc. Among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/131H01M4/1391H01M4/485H01M4/505H01M4/525H01M10/054H01M4/02
CPCH01M4/0471H01M4/131H01M4/1391H01M4/505H01M4/525H01M4/485H01M10/054H01M2004/028Y02E60/10
Inventor 胡海燕熊利斌王恩多付莎左兰兰付娜吴雄伟
Owner 江西省钒电新能源有限公司
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