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Molybdenum oxide/diamond negative electrode composite material for lithium battery and preparation method thereof

A technology of molybdenum oxide and composite materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of large volume change, low electron mobility of molybdenum-based materials, poor cycle performance and rate performance

Active Publication Date: 2020-09-08
重庆启晶科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the disadvantages of the negative electrode materials of lithium batteries in the current prior art that the electron mobility of the molybdenum-based material is low and the volume changes during the charging and discharging process are large, resulting in poor cycle performance and rate performance, the purpose of the present invention is to provide a A molybdenum oxide / diamond negative electrode composite material for lithium batteries, which has the characteristics of high specific capacity, good cycle performance and rate performance

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  • Molybdenum oxide/diamond negative electrode composite material for lithium battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A method for preparing a molybdenum oxide / diamond negative electrode composite material for lithium batteries, the steps are as follows:

[0030] (1) The molybdenum sheet was ultrasonically cleaned with absolute ethanol and acetone for 15 min, and then dried with nitrogen gas. The treated molybdenum sheet was placed in a vacuum coating chamber and vacuumed to a pressure of 2×10 -3 Pa, then argon gas was introduced to a pressure of 2 Pa, the bias power was turned on, and the metal substrate was sputtered and cleaned with argon (Ar) plasma for 15 min to obtain a molybdenum sheet. The sputtering cleaning condition was that the power supply was 30 kW. The negative bias voltage applied to the metal substrate is -600 V, and the bias duty cycle is 50%;

[0031](2) Put the molybdenum sheet in the magnetron sputtering coating deposition chamber, pass argon gas into the magnetron sputtering coating deposition chamber (argon gas flow rate is 100 sccm), until the pressure in the c...

Embodiment 2

[0036] A method for preparing a molybdenum oxide / diamond negative electrode composite material for lithium batteries, the steps are as follows:

[0037] (1) The molybdenum sheet was ultrasonically cleaned with absolute ethanol and acetone for 15 min, and then dried with nitrogen gas. The treated molybdenum sheet was placed in a vacuum coating chamber and vacuumed to a pressure of 2×10 -3 Pa, and then argon gas was introduced to a pressure of 2 Pa, the bias power was turned on, and the metal substrate was sputtered and cleaned with argon (Ar) plasma for 15 min to obtain molybdenum sheet A1. The sputtering cleaning condition was that the power supply was 30 kW. The negative bias voltage applied to the metal substrate is -600 V, and the bias duty cycle is 50%;

[0038] (2) Place the molybdenum sheet A1 in the magnetron sputtering coating deposition chamber, pass argon gas into the magnetron sputtering coating deposition chamber (the flow rate of argon gas is 100 sccm), until the...

Embodiment 3

[0043] A method for preparing a molybdenum oxide / diamond negative electrode composite material for lithium batteries, the steps are as follows:

[0044] (1) The molybdenum sheet was ultrasonically cleaned with absolute ethanol and acetone for 15 min, and then dried with nitrogen gas. The treated molybdenum sheet was placed in a vacuum coating chamber and vacuumed to a pressure of 2×10 -3 Pa, and then argon gas was introduced to a pressure of 2 Pa, the bias power was turned on, and the metal substrate was sputtered and cleaned with argon (Ar) plasma for 15 min to obtain molybdenum sheet A1. The sputtering cleaning condition was that the power supply was 30 kW. The negative bias voltage applied to the metal substrate is -600 V, and the bias duty cycle is 50%;

[0045] (2) Place the molybdenum sheet A1 in the magnetron sputtering coating deposition chamber, pass argon gas into the magnetron sputtering coating deposition chamber (the flow rate of argon gas is 100 sccm), until the...

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Abstract

The invention relates to the technical field of lithium batteries and especially relates to a lithium battery molybdenum oxide / diamond cathode composite material and a preparation method thereof. Structurally, the lithium battery molybdenum oxide / diamond cathode composite material is sequentially prepared from a molybdenum substrate, a doped diamond film and a graphite film from bottom to top, wherein the doped diamond film contains doped elements, and the doped elements are boron and nitrogen; the doped diamond film is prepared from all the elements in atomic percent content: 75 to 80at.% ofcarbon, 10 to 15at.% of boron and 5 to 15at.% of nitrogen. By means of the doped diamond film, the lithium battery molybdenum oxide / diamond cathode composite material disclosed by the invention can inhibit volume change in a cathode material charging and discharging process; as the graphite film is deposited on the surface of the doped diamond film, ion and electron migration efficiencies in the cathode material are improved, and resistance of the cathode material is reduced; thus, charge-discharge performance of the battery is improved, and service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a molybdenum oxide / diamond negative electrode composite material for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, small self-discharge, long cycle life and no memory effect, and are considered to be the most promising energy storage devices. At present, lithium-ion batteries have been widely used in consumer electronics products such as mobile phones, cameras, and ultrabooks, and in recent years, more and more researches and applications have been developed in electric vehicles and power storage devices. Improving power density, energy density and service life is the main direction of lithium-ion battery research and development at this stage and the main demands of meeting more applications. The performance of energy storage devices largely depends on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/62H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 陈庆廖健淞
Owner 重庆启晶科技发展有限公司