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A kind of graphene/zinc oxide composite negative electrode material for lithium ion battery and preparation method thereof

A technology of lithium ion battery and negative electrode material, applied in the field of graphene/zinc oxide composite negative electrode material for lithium ion battery and its preparation, can solve the problems of poor charge-discharge cycle characteristics, low capacity reversibility, large volume expansion, etc. The effect of avoiding poor ohmic contact, controllable doping amount and good contact

Active Publication Date: 2016-08-17
衢州恒创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, zinc oxide exhibits relatively poor charge-discharge cycle characteristics and low capacity reversibility, which may be due to the relatively poor electronic and ionic conductivity of zinc oxide and the relatively large volume expansion after combining lithium ions.

Method used

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  • A kind of graphene/zinc oxide composite negative electrode material for lithium ion battery and preparation method thereof
  • A kind of graphene/zinc oxide composite negative electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 74.35 mg of zinc nitrate (Zn(NO) with a purity of 98% 3 ) 2 ·6H 2 (2) and 5.09mg purity are 99% graphene oxide powder, be dissolved together in the mixed solution that 10.0ml purity is 99.5% 1,2-propanediol and 10.0ml purity is the dehydrated alcohol of 99.5%, this mixed solution is used After 1 hour of ultrasonic agitation with a power of 700 W and a frequency of 50 Hz, a suspended ESD precursor solution was formed. A copper foil with a diameter of 15mm, a thickness of 1mm, and a purity of 98% (as a metal substrate) was weighed and fixed on the substrate splint, and then the metal substrate was heated to 100°C. The distance between the capillary nozzle and the metal substrate was adjusted to 7cm, and the applied DC voltage was 9kV. Set the spray speed of the liquid flow to 600 μl / h, turn on the switch, and the ESD device starts to spray the ESD precursor liquid onto the metal substrate. After 1 hour of spraying, the ESD apparatus was turned off. After the sample i...

Embodiment 2

[0033] 74.35 mg of zinc nitrate (Zn(NO) with a purity of 98% 3 ) 2 ·6H 2 (2) and 2.26mg purity are 99% graphene oxide powder, be dissolved together in the mixed solution that 13.3ml purity is 99.5% 1,2-propanediol and 6.7ml purity is the dehydrated alcohol of 99.5%, this mixed solution is used After 1.5 hours of ultrasonic stirring with a power of 750W and a frequency of 40 Hz, a suspended ESD precursor solution was formed. The nickel foam (as the metal substrate) with a diameter of 15 mm, a thickness of 2 mm, and a purity of 98% was weighed and fixed on the substrate splint, and then the metal substrate was heated to 250 °C. The distance between the capillary nozzle and the metal substrate was adjusted to be 5 cm, and the applied DC voltage was 11 kV. Set the spray speed of the liquid flow to 800 μl / h, turn on the switch, and the ESD device starts to spray the precursor liquid onto the substrate. After 1.5 hours of spraying, the ESD apparatus was turned off. After the sa...

Embodiment 3

[0036] 74.35 mg of zinc nitrate (Zn(NO) with a purity of 98% 3 ) 2 ·6H 2 (2) and 3.59mg purity are 99% graphene oxide powder, be dissolved together in the mixed solution of 1,2-propanediol that is 99.5% purity and 13.3ml purity is the dehydrated alcohol of 99.5% in 6.7ml purity, this mixed solution is used After 2 hours of ultrasonic stirring with a power of 1000 W and a frequency of 20 Hz, a suspended ESD precursor solution was formed. The nickel foam (as the metal substrate) with a diameter of 15 mm, a thickness of 1 mm and a purity of 98% was weighed and fixed on the substrate splint, and then the metal substrate was heated to 200 °C. The distance between the capillary nozzle and the metal substrate was adjusted to 6 cm, and the applied DC voltage was 12 kV. Set the spray speed of the liquid flow to 700 μl / h, turn on the switch, and the ESD device starts to spray the precursor liquid onto the metal substrate. After 2 hours of spraying, the ESD apparatus was turned off. ...

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Abstract

The invention discloses a graphene / zinc oxide negative electrode material for a lithium ion battery, and a preparation method thereof. The graphene / zinc oxide negative electrode material for the lithium ion battery is a blend comprising graphene and zinc oxide according to a mass ratio of 1:9-2:8. The preparation method comprises the steps of dissolving water-containing zinc nitrate and graphene oxide powder in a mixed solution of 1,2-propylene glycol and absolute ethyl alcohol; stirring with ultrasonic waves to obtain a precursor solution used for ESD; fixing a metal substrate on a substrate-clamping plate; heating to a temperature of 100-250 DEG C; spraying the precursor solution used for ESD to a substrate material; spraying for 1-2 hours; and cooling to obtain the graphene / zinc oxide negative electrode material for the lithium ion battery. The material is a composite film having a porous structure, can be used as a negative electrode material of the lithium ion battery, can increase contact area between the electrode material and electrolyte, increases charge-discharge efficiency of the battery, and provides more space for volume expansion of zinc oxide after combination with lithium ions, thereby improving the whole electrochemical properties of the negative electrode material of the battery.

Description

technical field [0001] The invention belongs to the field of electrochemical and new energy materials, and relates to a graphene / zinc oxide composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] In hybrid / electric vehicles and portable electronic devices, the energy density and power density of batteries become two key factors affecting their wide application. Carbon-based materials, especially graphite, are currently the most commercially mature anode materials for lithium-ion batteries due to their stable reversible cyclability and high-speed charge-discharge stability. However, the theoretical capacity of graphite is only 370mAh g -1 , It is difficult to meet the growing demand for high-power electronic equipment and long-distance driving of electric vehicles. As a result, people have turned their attention to alternative materials with higher capacity, and transition metal oxides are one of them. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62
CPCH01M4/364H01M4/48H01M4/587H01M10/0525Y02E60/10
Inventor 武军胡冀程筱军邵李焕徐军明
Owner 衢州恒创新能源科技有限公司
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