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Sodium-ion battery positive material and preparation method and application thereof

A technology of sodium ion battery and positive electrode material, which is applied to battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low theoretical specific capacity, achieve high capacity, simple and convenient synthesis, and improve conductivity.

Active Publication Date: 2013-07-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently developed cathode materials for sodium-ion batteries, such as layered oxide Na x MO 2 (M=Cr, Co, Mn, etc., 04 , NaVPO of NASICON structure 4 In structures such as F, only one sodium ion can be stored at most, corresponding to the single electron transfer process, and the theoretical specific capacity is low

Method used

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  • Sodium-ion battery positive material and preparation method and application thereof
  • Sodium-ion battery positive material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1. Prussian blue compound / metal composite cathode material and its preparation and performance

[0022] By FeCl 2 : KCN:Iron powder=1:5:5 mole fraction, add water as a solvent, heat at 100℃ for 6h and then let stand for 2h. After the reaction is completed, it is separated and dried to obtain the Prussian blue compound / metal composite positive electrode material provided by the present invention.

[0023] The electrochemical analysis test is carried out on the Prussian blue compound / metal composite positive electrode material obtained by the invention, and the charge and discharge range is 2.0-4.2V. When charged and discharged at a current density of 20 mA / g, the capacity of the material can reach 140 mAh / g, and the capacity does not decay significantly after 50 cycles, which proves that the composite material obtained by the invention has high capacity and cycle performance. The composition of the obtained sodium ion cathode material and the test results in th...

Embodiment 2

[0024] Example 2. Prussian blue compound / metal composite cathode material and its preparation and performance

[0025] Put 0.01mol K 2 Cu(CN) 3 and 0.1mol KCl was dissolved in 100mL water to obtain a clear solution, and the solution was slowly dropped into 100mL0.05mol / L MnCl at 60°C 2 and 0.05mol / L nickel powder in a homogeneous mixed aqueous solution, stirred for 12h and then allowed to stand for 2h. After the reaction is completed, it is separated and dried to obtain the Prussian blue compound / metal composite positive electrode material provided by the present invention. The composition of the obtained sodium ion cathode material and the test results in the simulated battery are listed in Table 1.

Embodiment 3

[0026] Example 3. Prussian blue compound / metal composite cathode material and its preparation and performance

[0027] Put 0.01mol K 2 Zn(CN) 4 and 0.05mol KCl were dissolved in 100mL of water to obtain a clear solution, and the solution was slowly dropped into 100mL of 0.05mol / L Fe(NO) at 50°C. 3 ) 3 In the aqueous solution, stirred for 18h and then allowed to stand for 2h. After completion of the reaction, separation and drying were carried out to obtain Prussian blue compounds. It is then ball-milled with magnesium powder for 2 hours to obtain the Prussian blue compound / metal composite positive electrode material provided by the present invention. The composition of the obtained sodium ion cathode material and the test results in the simulated battery are listed in Table 1.

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Abstract

The invention provides a sodium-ion battery positive material. The sodium-ion battery positive material contains a compound of a prussian blue compound KnAa[B(CN)x]b and a metal material, wherein A and B are transition metals, n ranges from 0 to 2, a ranges from 1 to 4, x ranges from 1 to 8, b ranges from 0.5 to 4, and the content of metals is 0-80wt.%. The electrochemical performance of the prussian blue compound compounded with the metal material is obviously improved. Compared with the positive material of a single electron transfer sodium-ion battery, the material disclosed by the invention has higher capacity and better cycling stability. In addition, the invention also provides a preparation method of the sodium-ion battery positive material and application of the sodium-ion battery positive material in energy storage elements.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and also belongs to the technical field of energy materials. Specifically, it relates to a class of cathode materials for sodium ion batteries with double electron transfer characteristics, and a preparation method and application thereof. Background technique [0002] At present, the development of cheap and effective energy storage devices has become a focus of attention. Due to the abundant reserves of sodium in the earth's crust, reaching 2.3-2.8%, the mining cost is low and the price is cheap, making sodium-ion batteries one of the most potential energy storage devices expected to be used in large-scale energy storage power stations. Currently developed cathode materials for sodium-ion batteries, such as layered oxide Na x MO 2 (M=Cr, Co, Mn, etc., 0<x<1), NaFePO with olivine structure 4 , NaVPO of NASICON structure 4 Structures such as F can store only one sodium ion at most, corr...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/052
CPCY02E60/10
Inventor 郭玉国尤雅吴兴隆万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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