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Multi-element Prussian blue sodium ion battery positive electrode material and preparation method thereof

A cathode material, Prussian blue technology, applied in the field of electrochemical power supply, can solve problems such as poor cycle stability, and achieve the effects of improving structural stability, simple synthesis process and low energy consumption

Pending Publication Date: 2021-04-06
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrochemical properties of Prussian blue materials change with the change of transition metal elements. When the transition metal element is Ni, Ni is electrochemically inert in the material, and the capacity of the material is low, but the cycle stability is very good; and When M is an active element such as Co, Fe, Mn, etc., the capacity of the material is high, but the cycle stability is poor

Method used

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  • Multi-element Prussian blue sodium ion battery positive electrode material and preparation method thereof
  • Multi-element Prussian blue sodium ion battery positive electrode material and preparation method thereof
  • Multi-element Prussian blue sodium ion battery positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] Dissolve 3.5 mmol of nickel acetate tetrahydrate, 1.5 mmol of cobalt acetate tetrahydrate, and 5 mmol of trisodium citrate dihydrate in 50 ml of deionized water to form chelate solution A, and dissolve 5 mmol of sodium ferrocyanide and 1 g of ascorbic acid in A homogeneous solution B was formed in 50 ml of deionized water, and a homogeneous solution C was obtained by dissolving 3 g of NaCl and 1 g of PVP in 100 ml of deionized water. Mix solution A and solution B in 10 ml min -1 The dropping rate is added dropwise to solution C, and at the same time at 50 o N at a temperature of C 2 The reaction was stirred in the atmosphere, and the reaction solution was green. After the dropwise addition, continue to stir and react for 12 h, after standing still for 24 h, after washing with deionized water and alcohol several times, the filter cake was washed at 120 o After vacuum drying at C for 24 h, a blue-green Ni:Co:Fe 7:3:0 multi-component Prussian blue cathode material can b...

Embodiment 2

[0028] Dissolve 2.75 mmol of nickel acetate tetrahydrate, 2.25 mmol of ferrous sulfate heptahydrate and 5 mmol of trisodium citrate dihydrate in 50 ml of deionized water to form chelate solution A, and dissolve 5 mmol of sodium ferrocyanide with 1 g of ascorbic acid. A homogeneous solution B was formed in 50 ml deionized water, and 3 g NaCl and 1 g PVP were dissolved in 100 ml deionized water to obtain a homogeneous solution C. Mix solution A and solution B in 10 ml min-1 The dropping rate is added dropwise to solution C, and at the same time at 50 o N at a temperature of C 2 The reaction was stirred in the atmosphere, and the reaction solution was green. After the dropwise addition, continue to stir and react for 12 h, after standing still for 24 h, after washing with deionized water and alcohol several times, the filter cake was washed at 120 o After vacuum drying at C for 24 h, a blue-green Ni:Co:Fe 5.5:0:4.5 multi-component Prussian blue cathode material can be obtained,...

Embodiment 3

[0030] 2.5 mmol of nickel acetate tetrahydrate, 1 mmol of cobalt acetate tetrahydrate, 1.5 mmol of ferrous sulfate heptahydrate and 5 mmol of trisodium citrate dihydrate were dissolved in 50 ml of deionized water to form chelate solution A, and 5 mmol of sodium ferrocyanide was mixed with 1 g of ascorbic acid was dissolved in 50 ml of deionized water to form a homogeneous solution B, and 3 g of NaCl and 1 g of PVP were dissolved in 100 ml of deionized water to obtain a homogeneous solution C. Mix solution A and solution B in 10 ml min -1 The dropping rate is added dropwise to solution C, and at the same time at 50 o N at a temperature of C 2 The reaction was stirred in the air, and the reaction solution was green. After the dropwise addition was completed, the mixture was then stirred for 12 h, left to stand for 24 h, washed with deionized water and alcohol several times, and then heated at 120 o Dry in a vacuum oven at C for 24 h to obtain a blue-green Ni:Co:Fe multi-compo...

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Abstract

The invention relates to a multi-element Prussian blue sodium ion battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: mixing nickel acetate tetrahydrate Ni (AC) 2.4 H2O, cobalt acetate tetrahydrate Co (AC) 2.4 H2O, ferrous sulfate heptahydrate FeSO4. 7H2O and trisodium citrate dehydrate C6H5Na3O7. 2H2O to form a chelated solution A, mixing sodium ferrocyanide Na4Fe (CN) 6 and ascorbic acid to form a solution B, dissolving NaCl and PVP in deionized water, slowly dropwise adding the solution A and the solution B into the solution C by using a peristaltic pump, and stirring while dropwise adding; continuously stirring and reacting for 12 hours after dropwise adding to obtain turbid liquid, standing, ageing, centrifugally washing, and drying a filter cake in vacuum to obtain the multi-element Prussian blue sodium ion battery positive electrode material.

Description

technical field [0001] The invention relates to a multi-element Prussian blue cathode material and a preparation method thereof, belonging to the field of electrochemical power sources. Background technique [0002] With the commercialization of lithium-ion batteries, various portable electronic devices and electric vehicles consume more and more lithium-ion batteries, gradually causing a shortage of lithium resources and rising prices, which limits the development of lithium-ion batteries to a certain extent . In contrast, Na ions in the same main group as Li ions have similar chemical properties, and Na resources are very abundant, and Na-ion batteries also have the advantages of high energy conversion efficiency, long cycle life, and good safety performance, so Na Ion batteries have become a hot spot in the field of energy storage research. However, compared with lithium ions, Na ions have a larger radius, which requires electrode materials to have larger ion deintercal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12H01M4/1397H01M4/58H01M10/054
CPCC01C3/12H01M4/58H01M4/1397H01M10/054C01P2006/40C01P2002/72Y02E60/10
Inventor 张露露魏程陈朝尧傅心远杨学林
Owner CHINA THREE GORGES UNIV
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