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Copper-doped Prussia white analogue sodium-ion battery positive electrode material and preparation method thereof

A sodium-ion battery and cathode material technology, applied in the field of energy electrochemistry, can solve the problems of unstable Prussian white analogs, high equipment requirements, cycle capacity decay, etc., achieve excellent electrochemical performance, strong controllability of the preparation process, The effect of improving the stability of the crystal structure

Inactive Publication Date: 2018-01-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Take Mn 2+ and [Fe(CN) 6 ] 2- Prussian white analogues as structural elements are used as anode materials for sodium batteries, which have high working voltage, but usually face the problem of severe degradation of cycle capacity
John B.Goodenough et al. (J.Am.Chem.Soc.2015,137,2658-2664) have synthesized an anhydrous Prussian white analogue by ultra-high vacuum method, which has good performance; The equipment requirements are high, and ordinary vacuum drying ovens cannot synthesize this material; and the Prussian white analogue without water is very unstable in the air, and it is easy to absorb water and undergo phase transition

Method used

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  • Copper-doped Prussia white analogue sodium-ion battery positive electrode material and preparation method thereof
  • Copper-doped Prussia white analogue sodium-ion battery positive electrode material and preparation method thereof
  • Copper-doped Prussia white analogue sodium-ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Weigh 1.1995g MnCl 2 ·4H 2 O and 0.2420g Cu(Ac) 2 H 2 O was dissolved in 50 mL of deionized water, stirred for 20 min, and 50 mL of ethanol was added to the above solution, denoted as solution A;

[0018] 2) Weigh 1.8235g Na 4 Fe(CN) 6 Dissolved in 50mL deionized water, after stirring for 10min, add 36g NaCl, after stirring for 10min, add 50mL ethanol, denoted as solution B;

[0019] 3) Add solution A dropwise to solution B, continue to stir for 12h, the obtained mixed liquid is washed and centrifuged for 4 times, and the obtained material is transferred to a petri dish; the above-mentioned petri dish carrying the material is placed in a drying box, 100 After drying at ℃ for 24 hours, copper-doped Prussian white analog powder was obtained.

[0020] The copper-doped Prussian white analog powder, Ketjen black, and carboxymethyl cellulose sodium alkene obtained in the above process were dissolved in deionized water in a mass ratio of 7:1.5:1.5, and mechanically st...

Embodiment 2

[0022] 1) Weigh 1.1995g MnCl 2 ·4H 2 O and 0.3630g Cu(Ac) 2 H 2 O was dissolved in 50 mL of deionized water, stirred for 20 min, and 50 mL of ethanol was added to the above solution, denoted as solution A;

[0023] 2), 3) steps are the same as in Example 1.

[0024] The copper-doped Prussian white analog powder prepared in this example, homogenized coating and battery assembly are the same as those in Example 1, and the electrochemical performance test is carried out on it, and the current density is 20 mA / g.

Embodiment 3

[0026] 1) Weigh 1.1995g MnCl 2 ·4H 2 O and 0.1426g CuCl 2 Dissolve in 50mL of deionized water, stir for 20min, add 50mL of ethanol to the above solution, denoted as solution A;

[0027] 2), 3) steps are the same as in Example 1.

[0028] The copper-doped Prussian white analog powder prepared in this example has the same homogenization, electrode preparation, and battery assembly as Example 1, and its electrochemical performance is tested, and the current density is 20 mA / g.

[0029] Blank samples were prepared as follows:

[0030] 1) Weigh 1.1995g MnCl 2 Dissolve in 50mL of deionized water, stir for 20min, add 50mL of ethanol to the above solution, denoted as solution A;

[0031] 2), 3) steps are the same as in Example 1.

[0032] The blank sample powder prepared in this example, homogenized coating and battery assembly are the same as those in Example 1, and the electrochemical performance test is carried out on it, and the current density is 20 mA / g.

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Abstract

The invention relates to a copper-doped Prussia white analogue sodium-ion battery positive electrode material. The copper-doped Prussia white analogue sodium-ion battery positive electrode material ischaracterized in that the chemical formula of a Prussia white analogue is Na<1+Delta>Cu<x>Mn<y>[Fe(CN)6]<z>.nH2O, wherein the value range of Delta is 0-1, the value range of x is 0.05-0.25, the valuerange of Mn is 0.60-0.95, the value range of z is 0.9-1, and the value range of n is 0-4. The invention simultaneously provides a preparation method of the material.

Description

technical field [0001] The invention relates to a positive electrode material of a copper-doped Prussian white sodium ion battery and a preparation method, which belong to the preparation technology of nanometer materials and are applied to the field of energy electrochemistry. Background technique [0002] Lithium-ion batteries are currently widely used ion-type secondary batteries. Due to the low reserves of lithium in the earth, the cost of lithium batteries is rising year by year. Sodium is a very abundant element in the earth, and sodium-ion batteries are expected to be ion-type secondary batteries that are expected to be lower in cost. The sodium-containing cathode material is the only source of sodium storage for sodium-ion full batteries, and its structural stability and material transport determine the upper limit of the energy density and power density of sodium-ion full batteries. The open-frame structure of the Prussian white analog itself can effectively store ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054
CPCY02E60/10
Inventor 李家俊郭立超赵乃勤刘恩佐师春生何春年何芳马丽颖
Owner TIANJIN UNIV
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