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A carbon/molybdenum dioxide/silicon/carbon composite material, a battery negative electrode containing it, and a lithium-ion battery

A carbon composite material, molybdenum dioxide technology, applied in molybdenum oxide/molybdenum hydroxide, battery electrodes, secondary batteries, etc., can solve the problems of high voltage platform, poor cycle stability and rate performance of silicon anode

Active Publication Date: 2021-04-09
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the extremely poor cycle stability and rate performance of the existing silicon negative electrode, and the MoO 2 The negative electrode material of the battery has the problem of high voltage platform, and a carbon / molybdenum dioxide / silicon / carbon composite material is provided, which has better negative electrode lithium storage performance and can effectively solve the above problems
The entire composite material preparation process is simple and environmentally friendly

Method used

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  • A carbon/molybdenum dioxide/silicon/carbon composite material, a battery negative electrode containing it, and a lithium-ion battery
  • A carbon/molybdenum dioxide/silicon/carbon composite material, a battery negative electrode containing it, and a lithium-ion battery
  • A carbon/molybdenum dioxide/silicon/carbon composite material, a battery negative electrode containing it, and a lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A preparation method of carbon / molybdenum dioxide / silicon / carbon composite material, comprising the steps of:

[0057] 1) Ultrasonic dispersion of 0.2g of nano silicon powder in 20ml of absolute ethanol to obtain solution A;

[0058] 2) Dissolve 2.48g of ammonium tetramolybdate tetrahydrate in 80ml of deionized water to obtain solution B;

[0059] 3) Under stirring conditions, add solution B to solution A, then add 3.4 g of aniline to the mixed solution, and then add 6 ml of dilute hydrochloric acid solution with a concentration of 1M to the mixed solution;

[0060] 4) Stir the mixed solution obtained in step 3) at room temperature for 48 hours to make the in-situ polymerization reaction fully complete, then filter, wash with deionized water, and dry to obtain an organic precursor containing Mo-Si;

[0061] 5) The obtained Mo-Si-containing organic precursor was heat-treated at 650 °C for 2 h under the protection of an inert gas to obtain C-MoO 2 - Si composite materia...

Embodiment 2

[0078] A preparation method of carbon / molybdenum dioxide / silicon / carbon composite material, comprising the steps of:

[0079] 1) Ultrasonic dispersion of 0.1g of nano silicon powder in 30ml of absolute ethanol to obtain solution A;

[0080] 2) 1.24g of ammonium tetramolybdate heptahydrate was dissolved in 40ml of deionized water to obtain solution B;

[0081] 3) Under stirring conditions, add solution B to solution A, then add 1.7 g of aniline to the mixed solution, and then add dropwise 7 ml of dilute hydrochloric acid solution with a concentration of 0.8 M to the mixed solution;

[0082]4) Stir the mixed solution obtained in step 3) at room temperature for 25 hours to make the in-situ polymerization reaction fully complete, then filter, wash with deionized water, and dry to obtain an organic precursor containing Mo-Si;

[0083] 5) The obtained Mo-Si-containing organic precursor was heat-treated at 600 °C for 5 h under the protection of an inert gas to obtain C-MoO 2 - Si c...

Embodiment 3

[0094] A preparation method of carbon / molybdenum dioxide / silicon / carbon composite material, comprising the steps of:

[0095] 1) Ultrasonic dispersion of 0.3g of nano silicon powder in 30ml of absolute ethanol to obtain solution A;

[0096] 2) 2.48g ammonium tetramolybdate heptahydrate was dissolved in 80ml deionized water to obtain solution B;

[0097] 3) Under stirring conditions, add solution B to solution A, then add 3.4 g of aniline to the mixed solution, then add 8 ml of dilute hydrochloric acid solution with a concentration of 1M to the mixed solution;

[0098] 4) Stir the mixed solution obtained in step 3) at room temperature for 48 hours to make the in-situ polymerization reaction fully complete, then filter, wash with deionized water, and dry to obtain an organic precursor containing Mo-Si;

[0099] 5) The obtained Mo-Si-containing organic precursor was heat-treated at 800 °C for 1.5 h under the protection of an inert gas to obtain C-MoO 2 - Si composite material; ...

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Abstract

The invention relates to a carbon / molybdenum dioxide / silicon / carbon composite material, a battery negative electrode containing the same and a lithium-ion battery. The carbon / molybdenum dioxide / silicon / carbon composite material is nano-molybdenum dioxide evenly loaded on nano-carbon fibers And nano-silicon particles, the outermost layer is coated with carbon layer. The battery negative electrode comprising the carbon / molybdenum dioxide / silicon / carbon composite material is used to make a lithium ion battery, and the discharge specific capacity at 0.1A / g is not less than 750mAh / g, and the discharge specific capacity at 3A / g reaches at least 250mAh / g, after 500 cycles at a rate of 0.5A / g, the discharge specific capacity still remains at 480mAh / g and above, which has good cycle performance and rate performance.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a carbon / molybdenum dioxide / silicon / carbon composite material, a battery negative electrode containing the same and a lithium ion battery. Background technique [0002] The trend toward higher capacity of lithium-ion batteries requires the development of anode materials with higher specific capacity than graphite. The theoretical lithium storage capacity of silicon is 4200mAh / g, which is much higher than the theoretical specific capacity of graphite, which is 372mAh / g, and its reserves are abundant, so it is considered to be one of the ideal negative electrode materials for the next generation of lithium-ion batteries. However, the semiconducting properties of silicon and its volume expansion of up to 300% after intercalation of lithium make the cycle stability and rate performance of silicon anode extremely poor, and necessary modification must be carried out ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525C01B32/05C01B33/02C01G39/02
CPCC01B33/02C01G39/02C01P2002/72C01P2004/03C01P2004/04C01B32/05H01M4/366H01M4/386H01M4/48H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 姜春海邹智敏周文扬
Owner XIAMEN UNIV OF TECH
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