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Layered and tunnel-shaped mixed structure sodium ion battery positive electrode material and a preparation method thereof and a sodium ion battery

A technology for sodium ion batteries and positive electrode materials, which is applied in battery electrodes, chemical instruments and methods, and electrolyte battery manufacturing, etc., can solve problems such as poor cycle performance and low specific capacity, and achieve easy raw materials, simple preparation methods, and easy large-scale production. production effect

Inactive Publication Date: 2020-01-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current transition metal layered oxides in cathode materials have attracted extensive attention due to their high specific capacity, but at the same time, they also have poor cycle performance, which limits their practical applications.
Another tunnel-like oxide has excellent cycle stability and rate capability, but its specific capacity is low

Method used

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  • Layered and tunnel-shaped mixed structure sodium ion battery positive electrode material and a preparation method thereof and a sodium ion battery
  • Layered and tunnel-shaped mixed structure sodium ion battery positive electrode material and a preparation method thereof and a sodium ion battery
  • Layered and tunnel-shaped mixed structure sodium ion battery positive electrode material and a preparation method thereof and a sodium ion battery

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preparation example Construction

[0052] The invention provides a method for preparing a layered and tunnel-like mixed structure of a sodium ion battery cathode material, which includes:

[0053] Mix the sodium source, iron source and manganese source according to the molar ratio, and grind to obtain a mixed powder;

[0054] Calcining the mixed powder for the first time to obtain an intermediate product;

[0055] The intermediate product is ground and then calcined for the second time to obtain a sodium ion battery cathode material.

[0056] The present invention firstly mixes the sodium source, iron source and manganese source according to the molar ratio and grinds to obtain mixed powder;

[0057] Wherein, the molar ratio of the sodium source, iron source and manganese source is 0.6:0.04:0.96.

[0058] According to the present invention, the sodium source is preferably selected from one or more of sodium acetate, sodium nitrate, sodium oxalate and sodium citrate; more preferably from sodium acetate or sodium nitrate; m...

Embodiment 1

[0086] Example 1 Preparation of Na 0.6 Fe 0.04 Mn 0.96 O 2 Electrode material

[0087] The target product is Na 0.6 Fe 0.04 Mn 0.96 O 2 , Raw materials include sodium acetate, iron nitrate, and manganese acetate.

[0088] The raw material metal salt is weighed according to a molar ratio of 0.6:0.04:0.96, and then ground into a uniformly mixed powder with a mortar. The powder obtained by preliminary grinding is placed in a muffle furnace, and the heating rate is 1 degree per minute, and the intermediate product is calcined at 450 degree for 6 hours in an air atmosphere. The intermediate product after the first calcination is subjected to secondary grinding and then placed in a muffle furnace, and the target product Na is obtained by calcining at 900 degrees in an air atmosphere at a heating rate of 2 degrees per minute for 15 hours. 0.6 Fe 0.04 Mn 0.96 O 2 .

Embodiment 2

[0089] Example 2 Preparation of Na 0.6 Fe 0.04 Mn 0.96 O 2 Cathode material electrode sheet

[0090] The target product prepared in Example 1 of the present invention is mixed with Super P and the binder polyvinylidene fluoride in a mass ratio of 7:2:1, and the solvent N-methylpyrrolidone is added, after pulping, smearing, drying, etc. After the steps, an electrode sheet containing the target product oxide cathode material is obtained.

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Abstract

The invention provides a preparation method of a layered and tunnel-shaped mixed structure sodium ion battery positive electrode material. The preparation method comprises the following steps: mixinga sodium source, an iron source and a manganese source according to a molar ratio and grinding to obtain a mixed powder; calcining the mixed powder for the first time to obtain an intermediate product; and calcining the intermediate product for the second time after grinding so as to obtain the sodium ion battery positive electrode material. The sodium source, the iron source and the manganese source are mixed through a simple solid phase method to be subjected to two times of high-temperature calcination with combination of the specific ratio. The preparation method is simple, the raw materials are easy to obtain and the practical degree is high. The sodium ion battery positive electrode material has higher initial capacity and better charging and discharging cycle stability and has excellent rate performance and 60% capacity in case of 5C (1A g-1). The material has low preparation cost and is easy to produce on a large scale and can meet the application requirements of large-scale sodium ion battery energy storage.

Description

Technical field [0001] The present invention relates to the technical field of battery materials, in particular to a layered and tunnel-shaped mixed structure sodium ion battery cathode material, a preparation method thereof and a sodium ion battery. Background technique [0002] At present, the main energy of mankind is fossil fuels, mainly non-renewable energy sources such as coal and oil. However, the large-scale use of fossil energy brings a series of environmental pollution problems, and it is necessary to develop clean energy. With the development of clean energy, energy storage systems have become an indispensable part. Compared with lithium, sodium has abundant reserves on the earth, and the working principle of sodium ion batteries is similar to that of lithium ion batteries, making sodium ion batteries more suitable for large-scale energy storage systems. The cathode material is an important part of the sodium ion battery, which determines the performance of the sodium...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/054H01M10/058C01G45/12
CPCC01G45/1228C01P2002/72C01P2004/03H01M4/131H01M4/505H01M4/525H01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 章根强孙志浩彭波时亮
Owner UNIV OF SCI & TECH OF CHINA
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