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A kind of lithium manganese phosphate/lithium vanadium phosphate/carbon composite cathode material and preparation method thereof

A composite cathode material, lithium vanadium fluorophosphate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of poor cycle performance, poor rate performance of lithium manganese phosphate, etc., to improve ionic conductivity, easy to uniform Dispersion, good performance effect

Active Publication Date: 2021-02-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of poor rate performance and poor cycle performance of lithium manganese phosphate in the prior art, the object of the present invention is to provide a lithium manganese phosphate / lithium fluorovanadium phosphate / carbon composite positive electrode material and a preparation method thereof, the composite positive electrode The material has high discharge specific capacity, excellent cycle performance and rate performance

Method used

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  • A kind of lithium manganese phosphate/lithium vanadium phosphate/carbon composite cathode material and preparation method thereof
  • A kind of lithium manganese phosphate/lithium vanadium phosphate/carbon composite cathode material and preparation method thereof
  • A kind of lithium manganese phosphate/lithium vanadium phosphate/carbon composite cathode material and preparation method thereof

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Effect test

Embodiment 1

[0059] First, weigh 1mmol of vanadium acetylacetonate and dissolve it in 4ml of ethanol, then add 2mmol of H 3 PO 4 and 1.2mmol LiF, sonicated for 1h, and transferred into 4mmol of LiMnPO with an average particle size of 60nm after being fully dissolved and dispersed. 4 In the ethylene glycol solvent system, after ball milling for 3h, the obtained mixed slurry is moved into a round-bottomed flask with a reflux device, and an appropriate amount of ethylene glycol is added as a dispersant and a reflux medium to control the solid content (LiMnPO 4 content) is 30%. After ultrasonic treatment for 30 min, the reaction was strengthened for 12 h at a stirring speed of 300 r / min in a boiling state. The resulting product was washed three times with water and alcohol, and then separated by high-speed centrifugation to obtain a gray-green product, namely LiMnPO 4 / LiVPO 4 Fcomposites. Then the gray-green product was ground and mixed with 15%wt polyvinyl alcohol, placed in an atmosphe...

Embodiment 2

[0062] First weigh 1mmol of vanadium trichloride and dissolve it in 5ml of isopropanol, then add 1.5mmol of H 3 PO 4 , 1.5mmol LiCl and 1.5mmol NH 4 F; Ultrasonic treatment for 1h, after it was fully dissolved and dispersed, it was transferred into LiMnPO with a particle size of 4mmol and a particle size of 80nm 4 In the diethylene glycol solvent system, the mixed slurry obtained after ball milling for 2 hours was transferred to a round bottom flask with a reflux device, and an appropriate amount of ethylene glycol was added as a dispersant and reflux medium to control the solid content of the mixed slurry to 40%. After ultrasonic treatment for 30 min, the reaction was strengthened for 15 h at a stirring speed of 300 r / min in a boiling state. The resulting product was washed three times with water and alcohol, and then separated by high-speed centrifugation to obtain a gray-green product, namely LiMnPO 4 / LiVPO 4 Fcomposites. Then the gray-green product was ground and mix...

Embodiment 3

[0066] First weigh 1.5mmol of vanadium acetylacetonate (about 538.5mg) and dissolve it in 4.5ml of ethanol and 1.5ml of acetone, add 3mmol of H 3 PO 4 and 2mmol LiF; ultrasonic treatment for 2h, after it was fully dissolved and dispersed, it was transferred into 3.5mmol LiMnPO with a particle size of 50 4 In the triethylene glycol solvent system, after ball milling for 4 hours, move the obtained precursor slurry into a round-bottomed flask with a reflux device, and add an appropriate amount of triethylene glycol as a dispersant and a reflux medium, so that the solid content in the mixed slurry is 25 %. After ultrasonic treatment for 30 min, the reaction was strengthened for 18 h at a stirring speed of 300 r / min in a boiling state. The resulting product was washed three times with water and alcohol, and then separated by high-speed centrifugation to obtain a gray-green product, namely LiMnPO 4 / LiVPO 4 Fcomposites. Then the gray-green product was ground and mixed with 15% ...

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Abstract

The invention discloses a manganese phosphate lithium / lithium vanadium fluorophosphate / carbon composite anode material and a preparation method thereof, and aims to improve the ion eclectic conductivity and the circulation stability of manganese phosphate lithium and thus overcome defects that a manganese phosphate lithium anode material is poor in rate capability and poor in circulation stability. The composite material disclosed by the invention has a nominal molecular formula of (1-x)LiMnPO4*xLiVPO4F / C, and in the formula, x is greater than 0 and less than or equal to 0.3. The synthetic composite material has primary particles of 60-100nm in size, and the surfaces of the particles are coated by a layer of a uniform carbon source. The preparation method disclosed by the invention is simple in process and easy to control, and due to synergetic functions of the components, the prepared (1-x)LiMnPO4*xLiVPO4F / C composite anode material has the characteristics of being high in energy density, stable in circulation and good in rate capability.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a lithium manganese phosphate / lithium vanadium phosphate / carbon composite positive electrode material and a preparation method thereof. Background technique [0002] Polyanionic materials based on the phosphate system LiMPO with olivine structure 4 (M=Fe, Mn, Ni or Co) is the most mature, and most power batteries on the market use LiFePO 4 cathode material, while LiMnPO 4 Compared with LiFePO 4 Higher voltage platform (4.1V vsLi + / Li), which has a higher theoretical energy density than lithium iron phosphate cathode materials. However, the ion conductivity and electronic conductivity of lithium manganese phosphate are extremely low, and the pure phase lithium manganese phosphate tends to be an insulator, resulting in poor reversibility and poor rate performance of pure lithium manganese phosphate cathode materials. [0003] Although c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 曹雁冰彭忠东胡国荣杜柯许炼陶勇
Owner CENT SOUTH UNIV
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