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Composite lithium ion battery anode material and preparation method thereof

A negative electrode material and ion battery technology, applied in the field of electrochemical power supply, can solve problems such as unsatisfactory conductivity and poor material rate performance, and achieve the effects of low cost, good cycle performance, and easy operation

Active Publication Date: 2015-03-11
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After research, it was found that Na3VO4 has poor conductivity as a negative electrode material for lithium-ion batteries, resulting in poor material rate performance.

Method used

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  • Composite lithium ion battery anode material and preparation method thereof
  • Composite lithium ion battery anode material and preparation method thereof
  • Composite lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The material synthesis steps are as follows:

[0027] 1) Weigh 3mmol and 1mmol of sodium carbonate and vanadium pentoxide according to the molar ratio of 3:1 and dissolve them in beakers A and B filled with 10ml of distilled water, and stir on a magnetic stirrer for 20min to fully dissolve;

[0028] 2) Weigh 5mmol of hexamethylenetetramine and dissolve it in beaker C filled with 10ml of distilled water, transfer the solutions in beakers B and C in step 1) to beaker A, stir on a magnetic stirrer for 20min to obtain a uniform color solution;

[0029] 3) Transfer the uniformly colored solution obtained in step 2) to the lining of a 50ml hydrothermal kettle to 80% volume, react in a blast oven at 120°C for 24 hours, and cool naturally to room temperature;

[0030] 4) adding citric acid with a theoretical carbon content of 10% to the product obtained in step 3);

[0031] 5) The intermediate product obtained in step 4) was dried in an oven at 80°C for 12 hours, and then cal...

Embodiment 2

[0034] The material synthesis steps are as follows:

[0035] 1) Weigh 3 mmol and 1 mmol of sodium hydroxide and ammonium metavanadate according to the molar ratio of 3:1, respectively, and dissolve them in beakers A and B filled with 10 ml of distilled water, and stir on a magnetic stirrer for 20 minutes to fully dissolve;

[0036] 2) Weigh 5mmol of hexamethylenetetramine and dissolve it in beaker C filled with 10ml of distilled water, transfer the solutions in beakers A and B in step 1) to beaker C, stir on a magnetic stirrer for 20min to obtain a uniform color solution;

[0037] 3) Transfer the uniformly colored solution obtained in step 2) to the lining of a 50ml hydrothermal kettle to 80% volume, react in a blast oven at 120°C for 24 hours, and cool naturally to room temperature;

[0038] 4) adding glucose with a theoretical carbon content of 10% to the product obtained in step 3);

[0039] 5) The intermediate product obtained in step 4) was dried in an oven at 80°C for ...

Embodiment 3

[0042] The material synthesis steps are as follows:

[0043] 1) Weigh 3mmol and 1mmol of sodium carbonate and vanadium pentoxide according to the molar ratio of 3:1 and dissolve them in beakers A and B filled with 10ml of distilled water, and stir on a magnetic stirrer for 20min to fully dissolve;

[0044] 2) Weigh 5mmol of hexamethylenetetramine and dissolve it in beaker C with 10ml of distilled water, transfer the solution in beaker C in step 1) to B and step 1) to beaker A, and stir on a magnetic stirrer for 20min Obtain a solution of uniform color;

[0045] 3) Transfer the uniformly colored solution obtained in step 2) to the lining of a 50ml hydrothermal kettle to 80% volume, react in a blast oven at 120°C for 24 hours, and cool naturally to room temperature;

[0046] 4) adding sucrose with a theoretical carbon content of 10% to the product obtained in step 3);

[0047] 5) The intermediate product obtained in step 4) was dried in an oven at 80°C for 12 hours, and then c...

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Abstract

A provided composite lithium ion battery anode material is a carbon-coated Na3VO4 composite material which is granular and has the average dimension of about 200 nm. A preparation method of the material comprises: adding a vanadium pentoxide solution and a hexamethylene tetramine solution into sodium carbonate, so as to obtain a mixed solution; then transferring the mixed solution to a hydrothermal kettle liner, reacting at 120-180 DEG C in a blast baking oven for 10-24 h, cooling and adding a carbon source, drying the obtained intermediate product, and clacining at 400-600 DEG C in nitrogen or argon protective atmosphere for 5-10 h, so as to obtain the carbon-coated Na3VO4 composite material. The synthetic technology is simple, easy to operate, good in reappearance and low in cost. The prepared carbon-coated Na3VO4 particle is uniform in size and has the average particle size of about 200-300 nm. The prepared carbon-coated Na3VO4 composite material has relatively high capacity, relatively low charge / discharge platform and relatively good cycling performance when being used as a lithium ion battery anode material.

Description

technical field [0001] The invention relates to a novel lithium-ion battery negative electrode material, in particular to carbon-coated Na 3 VO 4 A composite negative electrode material belongs to the field of electrochemical power sources. Background technique [0002] Lithium-ion batteries are the third generation of small batteries after nickel-cadmium batteries and nickel-metal hydride batteries. ), excellent cycle performance, fast charging and discharging, high output power, long service life and other advantages have been widely used as power supplies for mobile electronic products such as laptops and mobile phones. Moreover, it is also regarded as an ideal power supply device for future electric vehicles and large-scale energy storage power stations. Commercial lithium-ion battery cathode materials have experienced considerable development from LiCoO2, LiNixMnyCozO2 (x+y+z=1) to LiFePO4. However, so far, anode materials are still mainly concentrated on graphite-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/48H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 倪世兵马建军张继成杨学林
Owner CHINA THREE GORGES UNIV
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