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Sodium-ion battery multi-element positive electrode material and preparation method thereof

A technology of sodium ion battery and positive electrode material, applied in battery electrodes, positive electrodes, electrical components and other directions, can solve problems such as low stability and low gram capacity, and achieve the effects of stable performance, modification of electrochemical performance, and low cost

Active Publication Date: 2020-09-22
帕瓦(兰溪)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sodium-ion batteries still have the problems of low stability and low gram capacity, and the development of sodium-ion batteries is greatly restricted due to the high-capacity and high-cycle performance of lithium-ion batteries. Highly stable cathode materials for sodium-ion batteries have become the focus of research on sodium-ion batteries in today's era

Method used

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  • Sodium-ion battery multi-element positive electrode material and preparation method thereof
  • Sodium-ion battery multi-element positive electrode material and preparation method thereof
  • Sodium-ion battery multi-element positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) According to the ratio of Na:Mn:Ni:Mg:W:B=0.67:0.7:0.15:0.1:0.05:0.03, Na carbonate is weighed 0.3664g, manganese acetate 1.7329g, nickel acetate 0.3770 g, 0.259g of magnesium nitrate, 0.1251g of ammonium tungstate, and 0.0186g of boric acid were dissolved in 50mL of deionized water, stirred and fully dissolved to form a uniform mixed solution.

[0036] (2) Weigh 2.112g of citric acid and add it into the mixed solution, and keep stirring in a 90°C water bath until the water evaporates to form a uniform sol.

[0037] (3) Put the sol in an oven at 120°C to dry the water, grind it into powder and put it in a muffle furnace for calcination, keep it at 450°C for 6 hours, then keep it at 900°C for 12 hours, then cool it naturally to get Na 0.67 mn 0.7 Ni 0.15 Mg 0.1 W 0.05 B 0.03 o 1.97 .

[0038] Weigh 0.07g of the above-prepared product, 0.02g of acetylene black (conductive agent), and 0.01g of PVDF (HSV900, binder). After fully grinding, add 0.6mL of NMP to disp...

Embodiment 2

[0043](1) According to the ratio of Na:Mn:Ni:Mg:W:B=0.67:0.7:0.15:0.1:0.05:0.05, Na excess 3% weighed 0.5924g of sodium nitrate, 1.7329g of manganese acetate and 0.3770g of nickel acetate g, 0.259g of magnesium nitrate, 0.1251g of ammonium tungstate, and 0.0311g of boric acid were dissolved in 50mL of deionized water, stirred and fully dissolved to form a uniform mixed solution.

[0044] (2) Weigh 2.112g of citric acid into the mixed solution, and keep stirring in a 90°C water bath until the water evaporates into a sol.

[0045] (3) Put the sol in an oven at 100°C to dry the water, grind it into powder and put it into a muffle furnace for calcination, keep it at 5000°C for 6 hours, then keep it at 925°C for 12 hours, then cool it naturally to get Na 0.67 mn 0.7 Ni 0.15 Mg 0.1 W 0.05 B 0.05 o 2 .

[0046] Weigh 0.07g of the above-prepared product, 0.02g of acetylene black (conductive agent), and 0.01g of PVDF (HSV900, binder). After fully grinding, add 0.6mL of NMP to di...

Embodiment 3

[0048] (1) According to the ratio of Na:Mn:Ni:Mg:W:B=0.67:0.7:0.2:0.05:0.05:0.03, Na carbonate is weighed 0.3736g, manganese acetate 1.7329g, nickel acetate 0.5027 g, 0.1259g of magnesium nitrate, 0.1251g of ammonium tungstate, and 0.0186g of boric acid were dissolved in 50mL of deionized water, stirred and fully dissolved to form a uniform mixed solution.

[0049] (2) Weigh 2.112g of citric acid and add it into the mixed solution, and keep stirring in a 90°C water bath until the water evaporates into a sol.

[0050] (3) Put the sol in an oven at 120°C to dry the water, grind it into powder and put it in a muffle furnace for calcination, keep it at 450°C for 6 hours, then keep it at 950°C for 10 hours, then cool it naturally to get Na 0.67 mn 0.7 Ni 0.2 Mg 0.05 W 0.05 B 0.03 o 2 .

[0051] Weigh 0.07g of the above-prepared product, 0.02g of acetylene black (conductive agent), and 0.01g of PVDF (HSV900, binder). After fully grinding, add 0.6mL of NMP to disperse and mix...

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Abstract

A sodium-ion battery multi-element positive electrode material and a preparation method thereof are provided. The chemical general formula of the sodium-ion battery multi-element positive electrode material is Na<0.67>Mn<x>Mg<y>Ni<z>W<n>O<2-q>B<q>, 0.65 <= x <= 0.8, 0 < y < = 0.2, 0 < z < = 0.2, 0 < n < = 0.2, 0 < q < = 0.05, and x + y + z + n = 1. The preparation method comprises the following steps: adding a sodium source, a manganese source, a nickel source, a magnesium source, a tungsten source and a boron source into citric acid to generate sol, drying the sol to obtain gel, and carryingout heat treatment on the gel to obtain the sodium-ion battery multi-element positive electrode material. According to the preparation of the sodium ion battery multi-element positive electrode material, a cation or anion doping or co-doping means is utilized, so the structural stability and the conductivity of the material are enhanced. The material has good rate capability and excellent cyclingstability, the required raw materials are rich in resource and low in cost, and the preparation method is simple and controllable.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for sodium ion batteries, and in particular relates to a multi-element positive electrode material for sodium ion batteries and a preparation method thereof. Background technique [0002] With the continuous development of the technological revolution and the increasing global environmental pollution caused by the consumption of coal, oil and other energy sources, the society is paying more and more attention to environmental issues, and it is becoming more and more important to develop new energy sources with high energy efficiency, abundant resources and environmental friendliness. At this time, lithium Ion batteries have entered the eyes of the general public, from mobile portable electronic devices to electric vehicles. However, with the rapid development of lithium-ion batteries, people's demand is increasing day by day, and lithium resources are continuously consumed. The limited ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/054
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M4/5825H01M10/054H01M2004/028Y02E60/10
Inventor 欧星苏石临王春辉张佳峰张宝
Owner 帕瓦(兰溪)新能源科技有限公司
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