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Porous hollow spherical lithium ion cell anode material of carbon-coating lithium vanadium phosphate and preparing method of anode material

A carbon-coated technology for lithium vanadium phosphate and lithium ion batteries, applied in battery electrodes, positive electrodes, secondary batteries, etc., to achieve the effects of simple method, promotion of diffusion, and full penetration

Inactive Publication Date: 2017-11-07
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The applicant has searched the prior art, but has not found relevant reports on controlling the morphology of the obtained lithium vanadium phosphate to further improve the cycle rate performance and electrical conductivity of the final product before coating with a conductive agent.

Method used

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  • Porous hollow spherical lithium ion cell anode material of carbon-coating lithium vanadium phosphate and preparing method of anode material
  • Porous hollow spherical lithium ion cell anode material of carbon-coating lithium vanadium phosphate and preparing method of anode material
  • Porous hollow spherical lithium ion cell anode material of carbon-coating lithium vanadium phosphate and preparing method of anode material

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Experimental program
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Embodiment 1

[0036] 1) Dissolve 1.0555g soluble starch in 350ml deionized water, then add 3.81gLiOH·H 2 O, 5.2424gV 2 o 5 , 9.9462g NH 4 h 2 PO 4 (The concentrations of starch, lithium, vanadium and phosphorus are 0.3wt%, 0.259mol / L, 0.08mol / L, 0.24mol / L respectively), magnetically stirred at room temperature for 3 hours, and the speed is 60r / min to obtain a mixed solution ;

[0037] 2) The obtained mixed solution is spray-dried at a rate of 10mL / min in the spray drying tower, and the inlet temperature is set to 220°C to obtain a milky yellow lithium vanadium phosphate precursor;

[0038] 3) Place the acetylene black in the milky yellow lithium vanadium phosphate precursor and 8 wt% of its weight in a high-temperature tube furnace, and sinter at 800° C. for 8 hours under an inert gas. The calcination procedure is as follows: calcine at 300-450° C. for 3 hours , the heating rate is 3°C / min, calcined at 800°C for 8h, the heating rate is 3°C / min, and cooled with the furnace to obtain a ...

Embodiment 2

[0057] 1) Dissolve 1.0555g of citric acid in 350ml of deionized water, then add 3.81g of LiOH·H 2 O, 5.2424g V 2 o 5 , 9.9462g NH 4 h 2 PO 4 (The concentration of citric acid, lithium element, vanadium element and phosphorus element is 0.3wt%, 0.259mol / L, 0.08mol / L, 0.24mol / L respectively), magnetically stirred at room temperature for 3h, and the rotating speed is 60r / min to obtain a mixed liquid;

[0058] 2) The obtained mixed solution is spray-dried at a rate of 10mL / min in the spray drying tower, and the inlet temperature is set to 220°C to obtain a milky yellow lithium vanadium phosphate precursor;

[0059] 3) Place the acetylene black in the obtained milky yellow lithium vanadium phosphate precursor and 4 wt% of its weight in a high-temperature tube furnace, and sinter at 800° C. for 8 hours under an inert gas. The calcination procedure is as follows: calcine at 300° C. for 3 hours, heat up The rate is 3°C / min, calcined at 800°C for 8 hours, the heating rate is 3°C / ...

Embodiment 3

[0064] 1) Dissolve 1.75g ​​glucose in 350ml deionized water, then add 2.8868g Li 2 CO 3 , 3.719gV 2 o 3 , 6.1g H 3 PO 3 (Concentrations of glucose, lithium, vanadium, and phosphorus are 0.5wt%, 0.1mol / L, 0.07mol / L, and 0.2mol / L, respectively), magnetically stirred at room temperature for 3 hours, and the speed was 70r / min to obtain a mixed solution ;

[0065] 2) The obtained mixed solution is spray-dried at a rate of 15mL / min in a spray-drying tower, and the inlet temperature is set to 220°C to obtain a milky yellow lithium vanadium phosphate precursor;

[0066] 3) Place the obtained milky yellow lithium vanadium phosphate precursor and CMC equivalent to 12 wt% of its weight in a high-temperature tube furnace, and sinter at 800° C. for 8 hours under an inert gas. The calcination procedure is as follows: calcine at 300-450° C. for 3 hours, The heating rate is 3°C / min, calcined at 800°C for 8 hours, the heating rate is 3°C / min, and cooled with the furnace to obtain a black...

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Abstract

The invention discloses a porous hollow spherical lithium ion cell anode material of carbon-coating lithium vanadium phosphate and a preparing method of the anode material. The preparing method of the anode material comprises the steps of taking a binder, a lithium source, a vanadium source and a phosphorous source into water, stirring and dissolving the materials, and conducting spraying drying on the obtained mixed solution to obtain a precursor; mixing the obtained precursor with a carbon source, conducting calcination under a protective atmosphere condition to obtain the anode material, wherein the concentration of the binder in water is 0.3-0.5 wt%, the concentration of the lithium element of the lithium source in water is 0.1-1 mol / L, the concentration of the vanadium element of the vanadium source in water is 0.06-0.6 mol / L, the concentration of the phosphorous element of the phosphorous source in water is 0.09-0.9 mol / L, and the additive amount of the carbon source is 4-20 wt% that of the precursor. The anode material prepared through the method is in a porous hollow spherical shape, and has a high specific area, and the circulation factor performance of the obtained product can be effectively improved.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a porous hollow spherical lithium ion battery cathode material carbon-coated lithium vanadium phosphate and a preparation method thereof. Background technique [0002] Lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) has the common advantages of phosphate system materials such as stable structure and long cycle life. At the same time, it has a higher working voltage (median voltage about 4.0V) and higher theoretical specific capacity (197mAh / g) and other advantages. Therefore, lithium vanadium phosphate material is one of the preferred positive electrode materials for the development of lithium-ion power batteries with high energy density, high rate performance and good safety performance. However, lithium vanadium phosphate suffers from low intrinsic electronic and ionic conductivity issues due to the nature of isolated VO6 octahedrons, resulting in low electronic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 邓健秋李育珊周怀营姚青荣王仲民
Owner GUILIN UNIV OF ELECTRONIC TECH
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