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FeS flaky array film and preparation method thereof

An array and flake technology, which is applied in the field of FeS flake array thin film and its preparation, can solve the problems of powdering and peeling of electrode materials, achieve the effects of improving electrical conductivity, high structural stability, and simplifying the preparation process

Inactive Publication Date: 2015-03-25
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing FeS as a lithium ion electrode material that has a large volume expansion during charge and discharge, resulting in powdering and peeling of the electrode material, the present invention provides a method that can avoid FeS during charge and discharge. FeS flake array thin film with active material deactivated due to volume expansion during process and preparation method thereof

Method used

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  • FeS flaky array film and preparation method thereof
  • FeS flaky array film and preparation method thereof
  • FeS flaky array film and preparation method thereof

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Embodiment Construction

[0020] With reference to accompanying drawing, further illustrate the present invention:

[0021] The preparation method of FeS flake array film comprises the following steps:

[0022] 1) Use iron foil as the base, the purity of the iron foil is >99%, and the thickness of the iron foil is 0.05mm. The iron foil base is ultrasonically cleaned in acetone, absolute ethanol, and deionized water for 20 minutes respectively, and the cleaned base dry and ready for use;

[0023] 2), 2mmol sodium sulfide nonahydrate (Na 2 S·9H 2 O) and 2 mmol of sulfur powder (S) were dissolved in 30 mL of deionized water, and magnetically stirred at 70 ° C until the sulfur powder was completely dissolved. After forming a uniform and transparent light yellow solution, 0.5 mmol of ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and 30mL ethylenediamine (NH 2 CH 2 CH 2 NH 2 ) continue magnetic stirring to form a black uniform solution; the addition of ethylenediamine can form a chelate with metal ion...

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Abstract

The invention discloses a preparation method of a FeS flaky array film. The preparation method comprises the following steps: by taking an iron foil as a base, washing and drying the base for later use; preparing a uniform black reaction solution; filling the uniform black solution into a reaction kettle; enabling the iron foil base to obliquely lean against the wall of the reaction kettle, sealing and putting the reaction kettle in a constant-temperature drying box; after reaction, naturally cooling the reaction kettle to room temperature; taking out the iron foil base; treating the iron foil base by means of washing, ultrasonic washing and washing in sequence by using absolute ethanol, and drying to obtain a FeS.mEDA precursor nanometer sheet array; thermally treating the FeS.mEDA nanometer sheet array in vacuum to obtain the FeS flaky array film. The FeS flaky array film comprises the iron foil base and FeS nanometer sheets which grow in situ on the iron foil base; the FeS nanometer sheets are vertical to the iron foil base and are intersected to form an open netlike array. The preparation method disclosed by the invention has the advantage of effectively buffering repeated changing of the volume of the FeS during charging and discharging.

Description

technical field [0001] The invention relates to a FeS flake array film and a preparation method thereof. technical background [0002] Lithium-ion batteries have been widely used as the main power source of portable devices such as mobile phones, notebook computers, and digital cameras. In recent years, the development of electric tools, electric bicycles and electric vehicles has provided good application prospects for lithium-ion batteries. The performance of lithium-ion batteries mainly depends on the electrode materials of lithium-ion batteries. [0003] Among them, ferrous sulfide FeS has become a potential new generation lithium ion electrode material due to its advantages of price and good environmental compatibility. In addition, ferrous sulfide FeS has a higher lithium intercalation voltage (1.3V) and theoretical capacity (609mA h g -1 ). However, the main problem of ferrous sulfide as a lithium-ion electrode material is that there is a large volume expansion du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1397H01M4/136H01M4/58B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/136H01M4/1397H01M4/5815H01M4/62H01M10/0525Y02E60/10
Inventor 邢程程刘嘉斌汪牡丹曹可黄六一孟亮方攸同
Owner ZHEJIANG UNIV
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