High-capacity p2-type cathode material for sodium-ion batteries and a method for increasing specific capacity by suppressing sodium/vacancy order

A positive electrode material and specific capacity technology, applied in the field of P2 type positive electrode materials for sodium ion batteries, can solve the problems of limited material capacity and reduced diffusion rate, and achieve the effects of improved transmission, simple and easy preparation process, and excellent discharge specific capacity

Active Publication Date: 2022-06-07
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 cathode material for sodium-ion batteries and a method for increasing specific capacity by suppressing sodium/vacancy order
  • High-capacity p2-type cathode material for sodium-ion batteries and a method for increasing specific capacity by suppressing sodium/vacancy order
  • High-capacity p2-type cathode material for sodium-ion batteries and a method for increasing specific capacity by suppressing sodium/vacancy order

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] Mix the prepared positive electrode material with the conductive additive Super-P and the binder polyvinylidene fluoride (PVDF) in a mass ratio of 8:1:1, and add an appropriate amount of N-methylpyrrolidone. After pulping and smearing, , drying and other processes to obtain the composite positive electrode.

[0032] (4) Assembling sodium-ion batter...

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 sodium-ion battery P2 positive electrode material and a method for orderly increasing the specific capacity by suppressing sodium / vacancies. The positive electrode material is a sodium-based layered metal oxide Na x TmO 2 , Tm is a transition metal, Tm includes one or more of Mn, Fe, Ni, Co and other elements, x is the stoichiometric number of sodium, and the range is 0.55⩽x⩽0.65. The present invention regulates the content of sodium ions in the P2-type layered positive electrode material of the sodium ion battery, effectively inhibits the charge order of the transition metal layer and the order of sodium / vacancy during the charging and discharging process, improves the diffusion rate of sodium ions in it, and then obtains Electrode materials with higher specific capacity. The method of the invention is simple and easy to operate, rich in raw materials and low in price, and has a high degree of practical application, can provide new insights into the structure and performance optimization of layered cathode materials for sodium ion batteries, and has broad application prospects.

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 Patents(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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