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Synthesis method of Ca and Fe co-doped sodium vanadium bronze electrode material based on vanadium-rich liquid

A technology of sodium vanadium bronze and electrode materials, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low initial charge and discharge capacity of sodium vanadium bronze electrode materials, complex synthesis process, and long synthesis cycle, etc. The effect of low cost, simple synthesis process, and shortened synthesis cycle

Active Publication Date: 2021-05-07
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In summary, the existing technical defects in the preparation methods of sodium vanadium bronze electrode materials are: a large amount of sodium salt needs to be added, the synthesis cost is high, the synthesis process is complex and the synthesis cycle is long, and the obtained sodium vanadium bronze electrode material is charged and discharged for the first time. lower capacity

Method used

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  • Synthesis method of Ca and Fe co-doped sodium vanadium bronze electrode material based on vanadium-rich liquid
  • Synthesis method of Ca and Fe co-doped sodium vanadium bronze electrode material based on vanadium-rich liquid
  • Synthesis method of Ca and Fe co-doped sodium vanadium bronze electrode material based on vanadium-rich liquid

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Embodiment 1

[0040] A synthesis method of Ca, Fe co-doped sodium vanadium bronze electrode material based on vanadium-rich solution. The steps of the synthetic method described in this specific embodiment are:

[0041] Step 1. According to the molar ratio of oxalate ions to vanadium ions in the vanadium-rich solution is 0.25:1, add oxalic acid dihydrate into the vanadium-rich solution and stir for 1 hour to obtain solution I.

[0042] Step 2, according to the molar ratio of vanadium ion and sodium dodecylbenzenesulfonate in the solution I is 50:1, adding the sodium dodecylbenzenesulfonate into the solution I, stirring for 0.5 hours, Mixture II is obtained.

[0043] Step 3: Put the mixed solution II in a reaction kettle, react at 160° C. for 10 hours, cool to room temperature, and separate solid and liquid to obtain a Ca and Fe co-doped sodium vanadium bronze electrode material based on a vanadium-rich solution.

[0044] The vanadium-rich solution: the vanadium concentration is 5.05g / L, t...

Embodiment 2

[0047] A synthesis method of Ca, Fe co-doped sodium vanadium bronze electrode material based on vanadium-rich solution. The steps of the synthetic method described in this specific embodiment are:

[0048] Step 1. According to the molar ratio of oxalate ions to vanadium ions in the vanadium-rich solution is 0.5:1, add oxalic acid dihydrate into the vanadium-rich solution and stir for 1.5 hours to obtain solution I.

[0049] Step 2, according to the molar ratio of vanadium ion and sodium dodecylbenzenesulfonate in the solution I is 200:1, adding the sodium dodecylbenzenesulfonate into the solution I, stirring for 0.7 hours, Mixture II is obtained.

[0050] Step 3: Put the mixed liquid II in a reaction kettle, react at 170° C. for 24 hours, cool to room temperature, and separate solid and liquid to obtain a Ca and Fe co-doped sodium vanadium bronze electrode material based on a vanadium-rich liquid.

[0051] The vanadium-rich liquid: the concentration of vanadium is 25.05g / L, ...

Embodiment 3

[0054] A synthesis method of Ca, Fe co-doped sodium vanadium bronze electrode material based on vanadium-rich solution. The steps of the synthetic method described in this specific embodiment are:

[0055] Step 1. According to the molar ratio of oxalate ions to vanadium ions in the vanadium-rich solution is 0.75:1, add oxalic acid dihydrate into the vanadium-rich solution and stir for 2.5 hours to obtain solution I.

[0056] Step 2, according to the molar ratio of vanadium ion and sodium dodecylbenzenesulfonate in the solution I is 400:1, adding the sodium dodecylbenzenesulfonate into the solution I, stirring for 0.9 hours, Mixture II is obtained.

[0057] Step 3: Put the mixed liquid II in a reaction kettle, react at 180° C. for 18 hours, cool to room temperature, and separate solid and liquid to obtain a Ca and Fe co-doped sodium vanadium bronze electrode material based on a vanadium-rich liquid.

[0058] The vanadium-enriched liquid: the concentration of vanadium is 35.55...

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Abstract

The invention relates to a synthesis method of a Ca and Fe co-doped sodium vanadium bronze electrode material based on vanadium-rich liquid. According to the technical scheme, the method comprises the following steps: adding oxalic acid dihydrate into the vanadium-rich liquid according to the molar ratio of oxalate ions to vanadium ions in the vanadium-rich liquid of (0.25-1): 1, and performing stirring to obtain a solution I; adding sodium dodecyl benzene sulfonate into the solution I according to the molar ratio of vanadium ions to sodium dodecyl benzene sulfonate in the solution I being (50-800): 1, and performing stirring to obtain a mixed solution II; placing the mixed solution II in a reaction kettle, reacting at 160-200 DEG C for 10-24 hours, cooling to room temperature, and carrying out solid-liquid separation to prepare the Ca and Fe co-doped sodium vanadium bronze electrode material (hereinafter referred to as an electrode material) based on the vanadium-rich solution. The synthesized electrode material is applied to an aqueous zinc ion battery, and the first charge-discharge capacity is 318-330 mAh / g under the current density of 0.2 A / g. The synthesis cost is low, the process is simple, the synthesis period is short, and the first charge-discharge capacity of the synthesized electrode material is relatively high.

Description

technical field [0001] The invention belongs to the technical field of synthesis of sodium vanadium bronze electrode materials. Specifically, it relates to a method for synthesizing Ca and Fe co-doped sodium vanadium bronze electrode materials based on vanadium-rich liquid. Background technique [0002] Sodium vanadium bronze is widely used in secondary ion batteries such as lithium-ion batteries, sodium-ion batteries and zinc-ion batteries because the sodium ions are located in the middle of the layered structure, which can improve good support and conductivity. chemical energy storage materials. [0003] At present, sodium vanadium bronze is mainly based on V 2 o 5 , sodium vanadate, ammonium vanadate, ammonium polyvanadate, etc. as raw materials, using high-temperature solid-phase reaction, low-temperature chemical reaction or hydrothermal reaction for synthesis. [0004] "A tetragonal NaV 2 o 5 ·H 2 O nano flake powder and its preparation method and application" (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01M4/485H01M4/525H01M10/36
CPCC01G49/0036C01G49/009H01M4/485H01M4/525H01M10/36H01M2004/028C01P2004/61C01P2002/72C01P2004/03Y02E60/10
Inventor 刘涛潘东张一敏刘红
Owner WUHAN UNIV OF SCI & TECH
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