a kind of moo 3 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, achieve excellent conductivity, high yield, and reduce volume The effect of swelling

Active Publication Date: 2021-07-20
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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  • a kind of moo <sub>3</sub> Composite carbon dot lithium ion battery anode material and preparation method thereof
  • a kind of moo <sub>3</sub> Composite carbon dot lithium ion battery anode material and preparation method thereof
  • a kind of moo <sub>3</sub> 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, add 10ml deionized water again, 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, add 10ml deionized water again, 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, add 10ml deionized water again, 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 sta...

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Abstract

The invention discloses a kind of MoO 3 Composite carbon dot lithium-ion battery anode material and its preparation method, using ammonium molybdate as a raw material composite carbon dot as a high-performance lithium-ion battery negative electrode material, firstly use performic acid as an oxide to strip coal tar pitch to prepare carbon dots, and then molybdenum Ammonium trioxide was used as raw material, and molybdenum trioxide was induced to grow oriented by carbon dots by hydrothermal method to form MoO with sea urchin structure 3 Composite carbon dot lithium ion battery anode material; this method has the characteristics of simple preparation process, short cycle, low energy consumption, good repeatability and high yield, and the MoO prepared by this method 3 The composite material can alleviate the volume expansion and increase the ion activation surface area, thereby improving the specific capacity and cycle stability of the 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 solidelectrolyte 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 ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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