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Sodium-ion battery cathode material and preparation method thereof

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high cost and high energy consumption, and achieve the effects of low cost, simple preparation process, and good cycle performance

Active Publication Date: 2013-07-31
SHANGHAI SINOPOLY JIAHUA BATTERY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anode materials for sodium-ion batteries that have been reported mainly include NaFePO 4 ,P2-Na 2 / 3 [Ni 1 / 3 mn 2 / 3 ]O 2 , Na x MnO 2 , Na x COO 2 , Na[Ni 1 / 3 Fe 1 / 3 mn 1 / 3 ]O 2 , Na x VO 2 and NaCrO 2 etc. These materials all need solid-state sintering, and in the case of mass production, the energy consumption is large and the cost is high. How to synthesize a sodium ion positive electrode material with ideal capacity and cycle performance at room temperature through simple steps is a fundamental problem. One of the key research directions for technical personnel in the field

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  • Sodium-ion battery cathode material and preparation method thereof
  • Sodium-ion battery cathode material and preparation method thereof
  • Sodium-ion battery cathode material and preparation method thereof

Examples

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Embodiment 1

[0020] Commercial sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 *10H 2 O) and sodium chloride are weighed according to the molar ratio of 0.5:0.5, wherein the quality of sodium ferrocyanide is 1.21g, and the quality of sodium chloride is 0.1461g, and they are dissolved in 10mL of deionized water to form a mixed solution . Pipette 400mL of ethanol into the beaker, add a magnetic stirrer, place the beaker containing ethanol on a temperature-controllable and speed-adjustable magnetic stirrer, set the temperature to 20°C, and adjust the speed to 400r / min. The mixed solution was added to the stirring ethanol solution at a rate of 15 drops / min through a speed-adjustable peristaltic pump to obtain a yellowish precipitate. The precipitate was placed in a constant temperature vacuum drying oven at 100° C. for 8 hours in vacuum to obtain sodium ferrocyanide-sodium chloride solid solution powder with a particle diameter of about 50 nm. The solid solution powder, the conductive agent...

Embodiment 2

[0022] Commercial sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 *10H 2 O) and sodium chloride were weighed according to the molar ratio of 0.75:0.25, wherein the quality of sodium ferrocyanide was 3.63g, and the quality of sodium chloride was 0.1461g, and they were dissolved in 10mL of deionized water to form a mixed solution . Pipette 400mL of ethanol into the beaker, add a magnetic stirrer, place the beaker containing ethanol on a temperature-controllable and speed-adjustable magnetic stirrer, set the temperature to 20°C, and adjust the speed to 400r / min. The mixed solution was added to the stirring ethanol solution at a rate of 15 drops / min through a speed-adjustable peristaltic pump to obtain a yellowish precipitate. The precipitate was placed in a constant-temperature vacuum drying oven at 100° C. for 8 hours in vacuum to obtain sodium ferrocyanide-sodium chloride solid solution powder with a particle diameter of about 200 nm. Using this material as the positive elec...

Embodiment 3

[0024] Commercial sodium ferrocyanide decahydrate (Na 4 Fe(CN) 6 *10H 2 O) and sodium chloride were weighed according to the molar ratio of 0.25:0.75, wherein the quality of sodium ferrocyanide was 4.84g, and the quality of sodium chloride was 1.7532g, and they were dissolved in 10mL of deionized water to form a mixed solution . Pipette 400mL of ethanol into the beaker, add a magnetic stirrer, place the beaker containing ethanol on a temperature-controllable and speed-adjustable magnetic stirrer, set the temperature to 20°C, and adjust the speed to 400r / min. The mixed solution was added to the stirring ethanol solution at a rate of 15 drops / min through a speed-adjustable peristaltic pump to obtain a yellowish precipitate. Place the precipitate in a constant temperature vacuum drying oven at 100°C for 8 hours in vacuum to obtain sodium ferrocyanide-sodium chloride solid solution powder with a particle diameter of about 500nm, such as image 3 shown. Using this material as ...

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Abstract

The present invention discloses a sodium-ion battery cathode material and preparation method thereof. The cathode material comprises solid / solution of sodium ferrocyanide-sodium chloride, whereby the molar ratio of sodium ferrocyanide and sodium chloride in solid / solution of sodium ferrocyanide-sodium chloride is x: (1-x), wherein 10% <= x <= 90%. The preparation method of mentioned cathode material includes the following steps of dissolving the sodium ferrocyanide and the sodium chloride at molar ratio of x: (1-x) in the deionized water, to obtain the mixed solution with concentration of between 0.001 and 6mol / L, wherein 10% <=<= x <=<= 90%; adding the ethanol solution with volume of 1 to 1000 times of the mixed solution into the beaker, to be placed on the temperature-speed-controllable magnetic stirrer, adding the magnon for the ethanol solution to obtain rotating speed at certain temperature; moving the mixed solution into the magnetic rotating ethanol solution at certain dropping rate through the speed-adjustable peristaltic pump to obtain the yellowish precipitate; taking the precipitate for vacuum drying to obtain the solid / solution of sodium ferrocyanide-sodium chloride powders. The invention has simple preparation method, and material prepared has high capacity and good cycling performance.

Description

technical field [0001] The invention relates to the field of sodium ion batteries, in particular to a sodium ion battery cathode material and a preparation method thereof. Background technique [0002] Due to its large capacity, good cycle life and safety, lithium-ion batteries have been widely used in the field of portable electronic devices, especially in recent years with the development of electric vehicles and large energy storage equipment, the application of lithium-ion batteries and research has exploded. However, limited lithium resources and high material costs have limited the further large-scale application of lithium-ion batteries to a certain extent, and there is also an urgent need to develop a battery system that can approach the performance of lithium-ion batteries. Sodium element is in the same main group as lithium element, has similar chemical properties, similar electrode potential, and is rich in sodium resources, and the cost of refining is low. It is...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 马紫峰杨德志廖小珍何雨石
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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