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

A sodium-ion battery, Prussian blue technology, applied in the field of preparation of Prussian blue-like materials by slow co-precipitation method, can solve the problems of low specific capacity and unsatisfactory cycle performance, achieve high capacity, slow down crystallization rate, and simplify production process Effect

Inactive Publication Date: 2021-10-08
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, when M is an electrochemically active element such as Fe, Co, Mn, etc., the specific capacity of the material is high, but the cycle performance is not ideal; and when Ni is an electrochemically inert element, although the cycle performance of the material is excellent, the specific capacity is low. Low

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 5 mmol FeSO 4 ·7H 2 O and C 4 H 6 O 6 Dissolve 25 mmol in 50 ml of deionized water to form solution A, 5 mmol Na 4 Fe(CN) 6 ·10H 2 O and 1 g C 6 H 8 O 6 Dissolved in 50 ml of deionized water to form solution B; 1 g of PVP and 6 g of NaCl were dissolved in deionized water to form solution C; solution A and solution B were simultaneously added dropwise to solution C at a rate of 0.167 ml / min, while dropping Stir and heat until the dropwise addition is completed, the solution becomes a white suspension, continue to stir for 12 h, and then age for 24 h; then centrifuge with deionized water and absolute ethanol on a centrifuge with a rotation speed of ≧8000 rpm / min. Washed three times; finally, the dark blue solid was dried in a vacuum oven at 120 °C for 24 h to obtain the target product iron-based Prussian blue cathode material, marked as Na 2 FeFe(CN) 6 -1. The resulting Na 2 FeFe(CN) 6 -1 The positive electrode material is stirred with acetylene black and po...

Embodiment 2

[0034] 5 mmol Mn(Ac) 2 ·4H 2 O and 50 mmol C 4 H 6 O 6 Dissolve in 50 ml of deionized water to form solution A, 5 mmol Na 4 Fe(CN) 6 ·10H 2 O and 1 g C 6 H 8 O 6 Dissolved in 50 ml of deionized water to form solution B; 1 g of PVP and 6g of NaCl were dissolved in deionized water to form solution C; solution A and solution B were simultaneously added dropwise to solution C at a rate of 0.167 ml / min, while dropping Stir and heat until the dropwise addition is completed, the solution turns into a white suspension, continue to stir for 12 h, and then age for 24 h; Centrifuged and washed three times; finally, the obtained precipitate was dried in a vacuum oven at 120 °C for 24 h to obtain the target product manganese-based Prussian blue cathode material, marked as Na 2 MnFe(CN) 6 -1. The resulting Na 2 MnFe(CN) 6 -1 The positive electrode material is stirred with acetylene black and polyvinylidene fluoride (PVDF) to form a slurry, which is coated on aluminum foil, dri...

Embodiment 3

[0036] 5 mmol Co(Ac) 2 ·4H 2 O and 25 mmol C 4 H 6 O 6 Dissolve in 50 ml of deionized water to form solution A, 5 mmol Na 4 Fe(CN) 6 ·10H 2 O and 1 g C 6 H 8 O 6 Dissolved in 50 ml of deionized water to form solution B; 1 g of PVP and 6g of NaCl were dissolved in deionized water to form solution C; solution A and solution B were simultaneously added dropwise to solution C at a rate of 0.167 ml / min, while dropping Stir and heat until the dropwise addition is completed, the solution turns into a white suspension, continue to stir for 12 h, and then age for 24 h; Centrifuged and washed three times; finally, the obtained precipitate was dried in a vacuum oven at 120 °C for 24 h to obtain the target product cobalt-based Prussian blue cathode material, marked as Na 2 CoFe(CN) 6 -1. The resulting Na 2 CoFe(CN) 6 -1 The positive electrode material is stirred with acetylene black and polyvinylidene fluoride (PVDF) to form a slurry, which is coated on aluminum foil, dried,...

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Abstract

The invention relates to a Prussian blue sodium ion battery positive electrode material and a preparation method thereof. The method comprises the following steps: dissolving transition metal salt and tartaric acid in deionized water to form a solution A, dissolving sodium ferrocyanide decahydrate and ascorbic acid in deionized water to form a solution B, and dissolving polyvinylpyrrolidone and sodium chloride in deionized water to form a solution C; simultaneously adding the solution A and the solution B into the solution C through a peristaltic pump, and performing stirring while heating in an N2 atmosphere until the solution becomes a suspension liquid after dropwise adding is completed; keeping heating and stirring the suspension for 12 hours, finally aging at room temperature for 24 hours, then centrifugally washing with deionized water and absolute ethyl alcohol for three times respectively, and finally drying in vacuum at 120 DEG C for 24 hours to obtain the Prussian blue positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and relates to a tartaric acid-assisted co-precipitation method for synthesizing a Prussian blue-type sodium-ion battery positive electrode material and a preparation method thereof, in particular to a preparation method for preparing a Prussian blue-type material by a slow co-precipitation method. Background technique [0002] With the gradual scarcity of traditional fossil energy and increasingly serious environmental problems, the development of renewable energy has become an inevitable trend. Renewable energy includes solar energy, hydropower, wind power, tidal energy, ocean temperature difference energy, etc. However, most renewable energy is intermittent and random, making it difficult to use it effectively. Therefore, there is an urgent need to develop an energy storage system with excellent performance, and electrochemical energy storage is the most convenient, green, and eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054C01C3/08C01C3/11C01C3/12
CPCH01M4/58H01M10/054C01C3/08C01C3/11C01C3/12H01M2004/028Y02E60/10Y02P20/133
Inventor 张露露陈朝尧魏程傅心远杨学林
Owner CHINA THREE GORGES UNIV
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