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High-capacity P2-type positive electrode material of sodium-ion battery, and method for orderly improving specific capacity by inhibiting sodium/vacancy

A technology for sodium ion batteries and positive electrode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of reduced diffusion rate, limited material capacity, etc., and achieves improved transmission, simple and easy preparation process, and excellent discharge ratio. The effect of capacity

Active Publication Date: 2021-01-29
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the rearrangement of different sodium / vacancy orders in this type of cathode material during the process of deintercalating sodium ions, which reduces the diffusion rate of this type of material and limits the capacity of the material kinetically.

Method used

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  • High-capacity P2-type positive electrode material of sodium-ion battery, and method for orderly improving specific capacity by inhibiting sodium/vacancy
  • High-capacity P2-type positive electrode material of sodium-ion battery, and method for orderly improving specific capacity by inhibiting sodium/vacancy
  • High-capacity P2-type positive electrode material of sodium-ion battery, and method for orderly improving specific capacity by inhibiting sodium/vacancy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of Na 0.70 MnO 2 Cathode material.

[0027] Weigh Na according to the corresponding proportion 2 CO 3 , Mn 2 o 3 Ball milled for 24 hours, pressed into a disc with a diameter of 10 mm under a pressure of 10 MPa, and calcined at 1000 °C for 12 hours in a muffle furnace to obtain a sample powder.

[0028] (2) For Na 0.70 MnO 2 Sample powder for XRD test

[0029] Using an X-ray diffractometer, the Na 0.70 MnO 2 The XRD pattern of the sample powder is used to analyze the material effectively with reference to the standard PDF card.

[0030] (3) Preparation of Na 0.70 MnO 2 Composite cathode

[0031] The prepared positive electrode material is uniformly mixed with the conductive additive Super-P and the binder polyvinylidene fluoride (PVDF) in a mass ratio of 8:1:1, and an appropriate amount of N-methylpyrrolidone is added, and after pulping and smearing , drying and other processes to obtain the composite positive electrode.

[0032] (4) Assem...

Embodiment 2

[0037](1) Preparation of Na 0.70 MnO 2 Cathode material.

[0038] Weigh Na according to the corresponding proportion 2 CO 3 , Mn 2 o 3 , ball milled for 24h, pressed into a disc with a diameter of 10mm under a pressure of 10MPa, and calcined at 1000°C for 12h in a muffle furnace to obtain a sample powder.

[0039] (2) For Na 0.70 MnO 2 The sample powder is subjected to XRD test and the data is processed and analyzed (the specific steps are the same as in Example 1).

[0040] (3) Preparation of Na 0.70 MnO 2 Composite positive electrode (the specific steps are the same as in Example 1).

[0041] (4) Assemble the sodium ion battery (the specific steps are the same as in Example 1).

[0042] (5) Sodium ion battery test

[0043] A charge-discharge test was performed on the above-mentioned sodium ion battery at a constant current density of 40mA / g within a voltage range of 1.5-4.3v using a charge-discharge instrument.

Embodiment 3

[0045] (1) Preparation of Na 0.60 MnO 2 Cathode material.

[0046] Weigh Na according to the corresponding proportion 2 CO 3 , Mn 2 o 3 , ball milled for 24h, pressed into a disc with a diameter of 10mm under a pressure of 10MPa, and calcined at 1000°C for 12h in a muffle furnace to obtain a sample powder.

[0047] (2) For Na 0.60 MnO 2 The sample powder is subjected to XRD test and the data is processed and analyzed (the specific steps are the same as in Example 1).

[0048] (3) Preparation of Na 0.60 MnO 2 Composite positive electrode (the specific steps are the same as in Example 1).

[0049] (4) Assemble the sodium ion battery (the specific steps are the same as in Example 1).

[0050] (5) Sodium ion battery test (the specific steps are the same as in Example 1).

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Abstract

The invention discloses a high-capacity P2-type positive electrode material of a sodium-ion battery, and a method for orderly improving specific capacity by inhibiting sodium / vacancy. The positive electrode material is a sodium-based layered metal oxide NaxTmO2, Tm is a transition metal, Tm comprises one or more of Mn, Fe, Ni, Co and other elements, and x is a stoichiometric number of sodium and ranges from 0.55 to 0.65. By regulating the content of sodium ions in the P2-type layered positive electrode material of the sodium ion battery, the charge order of the transition metal layer and the sodium / vacancy order in the charging and discharging process are effectively inhibited, the diffusion rate of the sodium ions in the P2-type layered positive electrode material is improved, and then the electrode material with higher specific capacity is obtained. The method disclosed by the invention is simple and easy to operate, rich in raw materials, low in price and high in practical application degree, can provide a new insight for structure and performance optimization of the layered positive electrode material of the sodium-ion battery, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a high-capacity sodium ion battery P2 positive electrode material and a method for sequentially increasing specific capacity by suppressing sodium / vacancy. Background technique [0002] Due to the strong demand for the utilization of renewable energy and the promotion of smart grids in modern society, the demand for large-scale electrochemical energy storage systems has received great attention in the past decades. Alkali metal ion batteries occupy an extremely important position in the field of energy storage due to their high energy density and long cycle life. The sodium-ion battery system has received extensive attention in recent years due to its abundant resources, low price, environmental friendliness, and electrochemical properties similar to lithium-ion batteries, providing a new option for electrochemical energy storage. [0003] In recent years, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/054C01G45/12C01G53/00
CPCH01M4/505H01M4/525H01M10/054C01G45/1228C01G53/50H01M2004/021H01M2004/028C01P2006/40C01P2002/72Y02E60/10
Inventor 姚胡蓉吕伟军袁新光黄志高朱海亮
Owner FUJIAN NORMAL UNIV
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