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Preparation method of high-performance lithium ion power battery/porous carbon composite positive electrode material

A technology of composite positive electrode material and power battery, which is applied in the field of power lithium-ion battery materials to achieve the effects of good reproducibility, excellent performance and good application prospects

Inactive Publication Date: 2015-03-25
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to existing literature reports, the cycle life of porous carbon composite cathode materials is generally between 500-1200 times, and there is no preparation of Li 3 V 2 (PO 4 ) 3 / Related patent reports on porous carbon composite cathode materials

Method used

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  • Preparation method of high-performance lithium ion power battery/porous carbon composite positive electrode material
  • Preparation method of high-performance lithium ion power battery/porous carbon composite positive electrode material
  • Preparation method of high-performance lithium ion power battery/porous carbon composite positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0026] Firstly, the porous carbon (product number XFPO2 produced by Nanjing Nanometer Xianfeng Co., Ltd.) was refluxed with 30% by weight nitric acid at 70°C for 0.5 hours. Add lithium carbonate, ammonium metavanadate, ammonium dihydrogen phosphate and citric acid in a molar ratio of 3:2:3:2 to the reactor, add an appropriate amount of deionized water and ethanol with a concentration of 95% by volume, and use a magnetic stirrer After stirring for 30 minutes, the above-mentioned porous carbon treated with nitric acid was added, stirred, ultrasonicated for 20 minutes, and dried at 60° C. for 3 hours to obtain a powder. The resulting powder was then placed in N 2 Li 3 V 2 (PO 4 ) 3 / porous carbon composite. Obtained by XRD experiment figure 1 Li 3 V 2 (PO 4 ) 3 / XRD pattern of porous carbon composite cathode material, by figure 1 It can be seen that the synthesis of high crystallinity lithium vanadium phosphate has the same diffraction peak position as the monoclinic ...

Embodiment 2

[0028] Firstly, the porous carbon (product No. XFPO2 produced by Nanjing Nanometer Xianfeng Co., Ltd.) was refluxed with nitric acid with a concentration of 15% by weight at 60°C for 1 hour. Add lithium acetate, ammonium metavanadate, ammonium dihydrogen phosphate and citric acid in a molar ratio of 3:2:3:1.5 into the reactor, add an appropriate amount of deionized water and ethanol with a concentration of 95% by volume, and use a magnetic stirrer to After stirring for 10 minutes, the porous carbon treated with nitric acid was added, stirred, ultrasonicated for 30 minutes, and dried at 80° C. for 1 hour to obtain a powder. The resulting powder was then placed in N 2 Li 3 V 2 (PO 4 ) 3 / porous carbon composite. Lithium-ion battery assembly: by mass ratio Li 3 V 2 (PO 4 ) 3 / Porous carbon composite: polytetrafluoroethylene: acetylene black = 80:10:10 mixed and ground, evenly coated on the aluminum foil as the positive electrode, the reference electrode and the counter...

Embodiment 3

[0030] Firstly, the porous carbon (product number XFPO2 produced by Nanjing Nanometer Xianfeng Co., Ltd.) was refluxed with 20% by weight nitric acid at 60°C for 1 hour. Add lithium nitrate, ammonium metavanadate, ammonium dihydrogen phosphate and citric acid in a molar ratio of 3:2:3:2.5 into the reactor, add an appropriate amount of deionized water and ethanol with a concentration of 95% by volume, and use a magnetic stirrer to After stirring for 10 minutes, the porous carbon treated with nitric acid was added, stirred, ultrasonicated for 30 minutes, and dried at 70° C. for 2 hours to obtain a powder. The resulting powder was then placed in N 2 Li 3 V 2 (PO 4 ) 3 / porous carbon composite. Lithium-ion battery assembly: by mass ratio Li 3 V 2 (PO 4 ) 3 / Porous carbon composite: polytetrafluoroethylene: acetylene black = 80:15:5 mixed and ground, evenly coated on the aluminum foil as the positive electrode, the counter electrode is graphite carbon, and the electrolyt...

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Abstract

The invention discloses a preparation method and application of a high-performance lithium ion power battery / porous carbon composite positive electrode material. The preparation method comprises the following steps: performing refluxing on porous carbon with nitric acid at 40-60 DEG C for 0.5-2 hours; adding lithium carbonate / lithium nitrate / lithium acetate, ammonium metavanadate, ammonium dihydrogen phosphate and citric acid into a reactor according to the mole ratio of 3 to 2 to 3 to (1-3), adding a proper amount of deionized water and ethyl alcohol, stirring by a magnetic stirrer for 10-30 minutes, then adding porous carbon, further stirring for 10-15 minutes, carrying out ultrasonic treatment for 5-10 minutes, and drying at 50-80 DEG C for 2-3 hours; and forging the obtained powder in a N2 atmosphere tubular furnace at 700-900 DEG C for 4-6 hours, thereby obtaining the Li3V2(PO4)3 / porous carbon composite material. The preparation technology is simple, the cost is low, the energy consumption is low, the reproducibility is good, and the high-performance lithium ion power battery / porous carbon composite positive electrode material can be produced on a large scale, and conforms to the environment requirement.

Description

technical field [0001] The invention belongs to the field of power lithium-ion battery materials, and more specifically relates to a high-performance lithium-ion battery 3 V 2 (PO 4 ) 3 Preparation method and application of porous carbon composite cathode material. Background technique [0002] Since the successful development of lithium-ion batteries in the last century, lithium-ion batteries have been widely used, but to obtain good cycle performance, high specific capacity, high operating voltage, and high-rate charge-discharge performance of lithium-ion battery cathode materials has always been a scientific challenge. research focus. The commonly used positive electrode materials in industry now include lithium cobaltate, lithium iron phosphate, lithium manganate and ternary materials. However, they all have certain defects, such as poor cycle stability of lithium manganese oxide, high price and fast decay of lithium cobalt oxide, and unstable batches of lithium iro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/136H01M10/0525
CPCH01M4/136H01M4/587H01M10/0525Y02E60/10
Inventor 曾令兴钱庆荣陈庆华黄宝铨黄晓霞肖荔人
Owner FUJIAN NORMAL UNIV
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