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Sodium-ion battery anode material and preparation method and application thereof

A sodium ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problem of low charge and discharge capacity of the negative electrode material of sodium ion battery

Active Publication Date: 2018-09-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, more and more transition metal oxides / hydroxides have been reported as anode materials for sodium-ion batteries, but the charge-discharge capacity of anode materials for sodium-ion batteries is low

Method used

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  • Sodium-ion battery anode material and preparation method and application thereof
  • Sodium-ion battery anode material and preparation method and application thereof
  • Sodium-ion battery anode material and preparation method and application thereof

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preparation example Construction

[0030] The invention provides a preparation method of a negative electrode material for a sodium ion battery, comprising the steps of:

[0031] (1) providing a mixed aqueous solution comprising divalent transition metal ions and trivalent transition metal ions, the divalent transition metal ions comprising Co 2+ , Fe 2+ or Ni 2+ , the trivalent transition metal ions include Fe 3+ 、Co 3+ or Mn 3+ , the molar ratio of the divalent transition metal ion to the trivalent transition metal ion is 2 to 3:1;

[0032] (2) Under a protective atmosphere, the pH value of the mixed aqueous solution is adjusted to 8 to obtain a pre-reaction solution;

[0033] (3) performing crystallization reaction, washing and drying on the pre-reaction liquid in sequence to obtain hydrotalcite;

[0034] (4) Sintering the hydrotalcite and cooling to obtain the negative electrode material of the sodium ion battery.

[0035] The present invention firstly provides a mixed aqueous solution containing div...

Embodiment 1

[0055] Weigh 22.84g CoCl 2 ·6H 2 O and 13.33g Fe(NO 3 ) 3 9H 2 O (Co / Fe molar ratio = 3), dissolved in 600mL of carbon dioxide deionized water to obtain a mixed salt solution;

[0056] Weigh 12g NaOH and dissolve it in 200mL decarbonated deionized water to form a sodium hydroxide aqueous solution with a concentration of 1.5M; control the dropping speed at 1.6mL / min, and drop the sodium hydroxide aqueous solution into the mixed salt solution under nitrogen protection. The pH value of the mixed aqueous solution is 8 to obtain a pre-reaction solution;

[0057] Move the pre-reaction solution into an autoclave, seal it, place it in an oven at 130°C, take it out after 24 hours of reaction, wash the reaction product 3 times with deionized water to remove carbon dioxide, and wash it once with absolute ethanol, and put the precipitate Put it in an oven at 60°C overnight to get hydrotalcite;

[0058] Put the hydrotalcite in a muffle furnace at 400°C and keep it warm for 4 hours to...

Embodiment 2

[0066] Prepare the negative electrode material of sodium ion battery according to the method of Example 1, and test the composition, morphology and performance of hydrotalcite and the negative electrode material of sodium ion battery, the difference is that when preparing the mixed salt solution, weigh 11.42g CoCl 2 ·6H 2 O and 6.66g Fe(NO 3 ) 3 9H 2 O (Co / Fe molar ratio = 3), dissolved in 300 mL decarbonated deionized water.

[0067] The elements of the hydrotalcite and the negative electrode material of the sodium ion battery are analyzed, and the results show that the composition of the hydrotalcite is: Co 0.58 Fe 0.26 (OH) 2 (NO 3 ) 0.18 0.32H 2 O, (Co / Fe molar ratio=3:1); the negative electrode material of sodium ion battery is Fe 3 o 4 @Co 3 o 4 (Co / Fe molar ratio=3:1).

[0068] The hydrotalcite and sodium-ion battery anode materials were characterized by XRD and SEM, respectively. In the XRD diagram, the peaks are high and sharp, indicating that the crysta...

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Abstract

The invention provides a preparation method of a sodium-ion battery anode material, comprising the following steps: providing a mixed aqueous solution containing divalent transition metal ion and trivalent transition metal ion, wherein the divalent transition metal ion comprises cobalt ion, ferrous ion or nickel ion; the trivalent transition metal ion comprises iron ion, trivalent cobalt ion or trivalent manganese ion; and molar ratio of the divalent transition metal ion to the trivalent transition metal ion is 2-3: 1; regulating pH value of the mixed aqueous solution to 8 at the protective atmosphere so as to obtain a pre-reaction solution; successively carrying out a crystallization reaction on the pre-reaction solution, washing and drying to obtain hydrotalcite; and sintering the hydrotalcite and cooling to obtain the sodium-ion battery anode material. The prepared sodium-ion battery anode material has high sodium storage capacity, which can reach to 1140 mAh / g during first discharge process.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a negative electrode material for a sodium ion battery and a preparation method and application thereof. Background technique [0002] The traditional performance indicators of battery materials are mainly energy density, charge-discharge rate, and cycle performance. field. With the continuous development of the electronics industry, the market demand for battery materials continues to increase, and lithium resources are facing a shortage of resources. Therefore, there is an urgent need for a battery energy storage material with high energy efficiency, abundant resources and environmental friendliness. [0003] Compared with lithium, sodium is a relatively abundant resource. With the continuous reduction of lithium ion resources, the demand for the development of sodium ion batteries is becoming more and more urgent. In the field of sodium-ion battery mate...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/36H01M10/054
CPCH01M4/362H01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 韩景宾赵亚军尹青卫敏
Owner BEIJING UNIV OF CHEM TECH
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