研究目的
Investigating the effects of a three-dimension polyaniline/poly (acrylic acid)/phytic acid compound binder on the cycling stability and specific capacity of silicon anodes in lithium-ion batteries.
研究成果
The multifunctional binder significantly enhances the cycle performance and specific capacity of silicon anodes in lithium-ion batteries, demonstrating a very long cycle life of more than 1000 cycles at high current density.
研究不足
The study does not address the scalability of the binder synthesis process or the cost implications of using phytic acid and poly (acrylic acid) in commercial battery production.
1：Experimental Design and Method Selection:
The study involves the synthesis of a multifunctional binder through the polymerization of aniline in the presence of phytic acid and poly (acrylic acid), using ammonium persulfate as a radical initiator.
2：Sample Selection and Data Sources:
Silicon nanoparticles (SiNPs) with diameters ranging from 50 to 100 nm were used as the active material.
3：List of Experimental Equipment and Materials:
Materials include SiNPs, PAA, Aniline, Phytic acid, and ammonium persulfate. Equipment includes a glove box, electrochemical workstation, LAND battery test system, and field emission scanning electron microscopy.
4：Experimental Procedures and Operational Workflow:
The binder was prepared by mixing solutions of aniline, phytic acid, PAA, and SiNPs, followed by the addition of ammonium persulfate. The mixture was then doctor-bladed onto a Cu foil and dried.
5：Data Analysis Methods:
Electrochemical performance was evaluated using cyclic voltammetry, galvanostatic charge/discharge tests, and electrochemical impedance spectroscopy.
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PAA
Mw:240000
Sigma-Aldrich
Provides high density of carboxyl groups to enhance the stability of the silicon electrodes
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Si nanoparticles
diameters ranged from 50 to 100 nm
Alfa Aear
Active material for the silicon anodes
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Aniline
Sigma-Aldrich
Polymerized into polyaniline for the binder
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Phytic acid
Sigma-Aldrich
Dopes and gelates polyaniline to form a continuous electrically conductive network structure
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ammonium persulfate
Initiator for the polymerization of aniline
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glove box
GP20
Etelux Co. Beijing, China
Used for assembling coin cells under controlled conditions
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electrochemical workstation
CHI 760 E
Chenhua Instruments Co., Shanghai, China
Used for testing cyclic voltammetry curves and electrochemical impedance spectroscopy
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LAND battery test system
Wuhan, China
Used for analyzing rate performance and cycling performance
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field emission scanning electron microscopy
Carl Zeiss Ultra 55
Used for measuring the morphologies of the silicon electrodes
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