Polyacrylonitrile-Li3VO4 lithium-ion battery anode material and preparation method thereof

A lithium-ion battery, polyacrylonitrile technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of loss of electrochemical performance, reduced practicability and durability of negative electrode materials, and low Coulomb efficiency in the first cycle. The effect of enhancing the electron transport rate and the diffusion rate of Li+, improving the practicality and durability of use, and avoiding the collapse of the matrix structure

Pending Publication Date: 2019-12-20
刘怀金
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently Li 3 VO 4 It is an intercalated lithium-ion battery anode material, Li 3 VO 4 The working potential is low, it has a relatively safe lithium intercalation potential, and it is higher than the precipitation potential of lithium, which can avoid the formation of lithium dendrites, and the voltage is lower than that of Li 4 Ti 5 o 12 material, higher than Li 4 Ti 5 o 12 The specific capacity is beneficial to increase the output voltage of the battery, however, Li 3 VO 4 The electronic conductivity of the lithium-ion battery is low, resulting in poor electrochemical performance. In the process of charging and discharging, the first-cycle coulombic efficiency is low and the polarization is large, resulting in poor electrical cycle performance of lithium-ion batteries. In the process of charging and discharging, due to the electrolytic reaction Make Li 3 VO 4 The volume expansion effect is generated, the matrix structure of the negative electrode material collapses, the electrochemical performance is lost, and the Li 3 VO 4 The practicality and durability of negative electrode materials greatly limit their application in commercial lithium-ion batteries

Method used

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Experimental program
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preparation example Construction

[0024] In order to achieve the above object, the present invention provides the following technical solutions: a polyacrylonitrile-Li 3 VO 4Lithium-ion battery negative electrode material and its preparation method, including the following formulation raw materials in proportions by weight: 20-23 parts of ammonium metavanadate, 9-12 parts of polyvinylpyrrolidone, 40-44 parts of lithium carbonate, 8-22 parts of polyvinylpyrrolidone Acrylonitrile, 5-7 parts of adhesive, 4-6 parts of conductive agent, the preparation method includes and the following experimental drugs: ethylene glycol, absolute ethanol, distilled water, dilute hydrochloric acid, N,N-dimethylpyrrolidone, vanadium NH in ammonium acid 4 VO 3 Mass fraction ≥ 95.8%, polyvinylpyrrolidone (C 6 h 9 NO) n The average molecular weight is 58000, the mass fraction is ≥97.4%, Li in lithium carbonate 2 CO 3 Mass fraction ≥ 96.2%, polyacrylonitrile molecular formula (C3H3N) n , mass fraction ≥ 97.5%, adhesive is polyvi...

Embodiment 1

[0029] (1) Preparation of nano-Li 3 VO 4 Particles: Add 150mL of distilled water and 20 parts of ammonium metavanadate to a 1000mL beaker in turn, and stir at a constant speed until the ammonium metavanadate is completely dissolved, then add 400mL of ethylene glycol and 9 parts of polyvinylpyrrolidone into the beaker, and transfer the materials in the beaker Enter the hydrothermal synthesis automatic reaction kettle, set the temperature at 200 ° C, and react with uniform magnetic stirring for 15 hours. After the reaction is complete, the reaction kettle is cooled to room temperature, and the material is filtered to remove the solvent to obtain a solid mixture, and sequentially use 500mL of absolute ethanol and Wash with 3000mL distilled water, place the cleaned solid mixture in a box-type resistance furnace for calcination, and heat up to 350°C at a heating rate of 10°C / min, and keep the temperature for calcination for 4 hours. Use 200mL substance concentration to be the dilu...

Embodiment 2

[0033] (1) Preparation of nano-Li 3 VO 4 Particles: Add 150mL of distilled water and 21 parts of ammonium metavanadate to a 1000mL beaker in turn, and stir at a constant speed until the ammonium metavanadate is completely dissolved, then add 400mL of ethylene glycol and 10 parts of polyvinylpyrrolidone to the beaker, and transfer the materials in the beaker Enter the hydrothermal synthesis automatic reaction kettle, set the temperature at 200°C, and react with uniform magnetic stirring for 16 hours. After the reaction is complete, the reaction kettle is cooled to room temperature, and the material is filtered to remove the solvent to obtain a solid mixture, and 500mL of absolute ethanol and Wash with 3500mL distilled water, place the cleaned solid mixture in a box-type resistance furnace for calcination, and heat up to 350°C at a heating rate of 10°C / min, and keep the temperature for calcination for 6 hours. After calcination, cool the material to room temperature, and then U...

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Abstract

The invention relates to the technical field of Li3VO4 lithium-ion battery anode materials, and discloses a polyacrylonitrile-Li3VO4 lithium-ion battery anode material, which includes the following formula materials: ammonium metavanadate, polyvinylpyrrolidone, lithium carbonate, polyacrylonitrile, an adhesive, and a conductive agent. In the polyacrylonitrile-Li3VO4 lithium-ion battery anode material, the polar polymer material polyacrylonitrile is added to generate a self-cyclization reaction to generate a cyclic polytetrahydropyridine derivative, of which a large amount of sp2 hybridizationcarbon can effectively promote the electron transfer rate and the rate performance of the electrode in an electrolytic reaction; and during the cyclization reaction, the polytetrahydropyridine derivative and the Li3VO4 are closely cross-linked together. Further, the flexible polymer chain of the polytetrahydropyridine derivative can suppress the volume expansion effect of the Li3VO4 during the delithiation and lithiation process of the electrode material, improve the cycle stability performance, and prevents the matrix structure of the anode material from collapsing and losing electrochemicalperformance.

Description

technical field [0001] The present invention relates to Li 3 VO 4 Lithium-ion battery negative electrode material technical field, specifically a kind of polyacrylonitrile-Li 3 VO 4 Lithium-ion battery negative electrode material and its preparation method. Background technique [0002] The negative electrode of lithium-ion battery refers to the end of the power supply with lower potential (potential). In the primary battery, it is the electrode that acts as an oxidizer, and is the electrode that flows out of electrons in the circuit. At present, common negative electrode materials include carbon negative electrode materials, tin-based negative electrode materials, Lithium-containing transition metal nitride anode materials, alloy anode materials and nano-scale anode materials, generally speaking, the selection of a good anode material should follow the following principles: high specific energy, low electrode potential relative to lithium electrodes, charge-discharge rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/60H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/602H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 刘怀金
Owner 刘怀金
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