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MoO3 composite carbon-dot lithium-ion battery anode material and preparation method thereof

A technology for lithium-ion batteries and anode materials, applied in the field of MoO3 composite carbon-dot lithium-ion battery anode materials and its preparation, can solve problems such as poor cycle performance and low conductivity, and achieve excellent conductivity, high yield and low energy consumption low effect

Active Publication Date: 2019-02-01
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the lower electrical conductivity and poor Li-ion transport kinetics, bulk MoO 3 Usually exhibit poor cycle performance when used as anode materials for lithium-ion batteries

Method used

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  • MoO3 composite carbon-dot lithium-ion battery anode material and preparation method thereof
  • MoO3 composite carbon-dot lithium-ion battery anode material and preparation method thereof
  • MoO3 composite carbon-dot lithium-ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1), adding performic acid as an oxide to coal tar pitch and centrifuging for 24 hours, then taking the supernatant, which is a carbon dot solution in which the solvent is performic acid;

[0023] 2), get 0.325g analytically pure ammonium molybdate ((NH 4 )Mo 7 o 24 4H 2 0) put into beaker, then add 10ml deionized water, ultrasonic 10min, make ammonium molybdate dissolve completely and disperse evenly;

[0024] 3) Take 15ml of the carbon dot solution and add it to the above solution, mix well, put it into the polytetrafluoroethylene lining, and conduct a hydrothermal reaction at 180°C for 6h;

[0025] 4) After the hydrothermal kettle was naturally cooled to room temperature, it was washed with deionized water and absolute ethanol for more than three times, and dried in vacuum for 12 hours to prepare MoO 3 Composite carbon dot lithium ion battery anode material.

Embodiment 2

[0027] 1), adding performic acid as an oxide to coal tar pitch and centrifuging for 24 hours, then taking the supernatant, which is a carbon dot solution in which the solvent is performic acid;

[0028] 2), get 0.45g analytically pure ammonium molybdate ((NH 4 )Mo 7 o 24 4H 2 0) put into beaker, then add 10ml deionized water, ultrasonic 10min, make ammonium molybdate dissolve completely and disperse evenly;

[0029] 3) Take 30ml of carbon dot solution and add it to the above solution and mix well, then put it into the polytetrafluoroethylene lining, and react with hydrothermal reaction at 120°C for 24h;

[0030] 4) After the hydrothermal kettle was naturally cooled to room temperature, it was washed with deionized water and absolute ethanol for more than three times, and dried in vacuum for 20 hours to prepare MoO 3 Composite carbon dot lithium ion battery anode material.

Embodiment 3

[0032] 1), adding performic acid as an oxide to coal tar pitch and centrifuging for 24 hours, then taking the supernatant, which is a carbon dot solution in which the solvent is performic acid;

[0033]2), get 0.55g analytically pure ammonium molybdate ((NH 4 )Mo 7 o 24 4H 2 0) put into beaker, then add 10ml deionized water, ultrasonic 10min, make ammonium molybdate dissolve completely and disperse evenly;

[0034] 3) Take 45ml of carbon dot solution and add it to the above solution and mix well, then put it into the polytetrafluoroethylene lining, and react with hydrothermal reaction at 150°C for 15h;

[0035] 4) After the hydrothermal kettle was naturally cooled to room temperature, it was washed with deionized water and absolute ethanol for more than three times, and dried in vacuum for 24 hours to prepare MoO 3 Composite carbon dot lithium ion battery anode material.

[0036] see figure 1 , it can be seen that the prepared product is h-MoO 3 , compared with the stan...

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Abstract

The invention discloses MoO3 composite carbon-dot lithium-ion battery anode material and a preparation method thereof. Ammonium molybdate is used as a material composite carbon dot to obtain a high-performance lithium-ion battery anode material; performic acid is used as an oxide to strip coal tar pitch to prepare a carbon dot, ammonium molybdate is then subjected as a raw material to the preparation of the MoO3 composite carbon-dot lithium-ion battery anode material by means of a hydrothermal process by using the carbon dot to induce oriented growth of molybdenum trioxide. The preparation method has the advantages of simplicity, short period, low energy consumption, good repeatability, high yield and the like; MoO3 composite prepared herein can relieve volumetric expansion and increase ion activated surface area, thereby increasing the specific capacity and cycle stability of a lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a kind of MoO 3 Composite carbon dot lithium ion battery anode material and preparation method thereof. Background technique [0002] Lithium-ion batteries are used more and more widely, but as the negative electrode of commercial lithium-ion batteries—graphite can only deliver 372mAh g -1 , It is far from meeting the needs of some electronic devices that require large capacity, such as electric vehicles. [Liu, J., P.J.Lu, S.Liang, J.Liu, W.Wang, M.Lei, S.Tang and Q.Yang, Ultrathin Li 3VO4nanoribbon / graphene sandwich-like nanostructures with ultrahigh lithium ionstorage properties. Nano Energy ,2015.12:p.709-724.][Yan,J.,J.Zhang,Y.C.Su,X.G.Zhang and B.J.Xia,A novel perspective on the formation of the solid electrolyte interphase on the graphite electrode for lithium-ion batteries.Electrochimica Acta ,2010.55(5):p.1785-1794.]MoO 3 As a member of transition metal ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/362H01M4/48H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 许占位赵怡星黄剑锋曹丽云贺菊菊王天杨军沈学涛
Owner SHAANXI UNIV OF SCI & TECH
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