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Study on the Preparation and Modification of Anode Material Li4Ti5O12 for Lithium-ion Batteries

Author: MaiFaRen
Tutor: WuXianMing
School: Jishou University
Course: Applied Chemistry
Keywords: lithium-ion battery anode material Li4Ti5O12improvement solid-statemethod sol-gel method
CLC: TM912
Type: Master's thesis
Year: 2013
Downloads: 90
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The spinel Li4Ti5O12as a“zero strain”material has become a research highlightamong various anode materials. In order to improve the rate performance of Li4Ti5O12by modification,in this thesis, Synthesis, improvements structural characterization,surface morphology and electrochemical products of spinel Li4Ti5O12were analyzed byX-ray diffractometry, scanning electron microscopy, galvanostatic charge-discharge,electrochemical impedance spectroscopy and cyclic voltammeter testIn the first chapter, gives a brief introduction about the structure and workingmechanism of lithium-ion batteries, the current survey on the spinel Li4Ti5O12materialwas introduced and the methods of Spinel Li4Ti5O12synthesis and a improve the rateperformance of Li4Ti5O12.In the second chapter, we introduce the experimental material and methodes. Thedetailed procedure of coin cell assembling in laboratory is described, as well as thegeneral characterization methods of materials and electrochemical analysis.In the third chapter, the anode materials spinel Li4Ti5O12for lithium-ion batterywere synthesized by high temperature solid-state method and triethanolamine assistedsol-gel method. The result shows that Li4Ti5O12prepared by the two methods hadperfect spinel structure.When the chemical molar ratio of TEA and titanium was0.8,Li4Ti5O12exhibited a relatively good rate capability and cycling stability.At thecharge-discharge rate of1.0C, its discharge capacities were153.03mAh·g-1, respectively.After35cycles, its discharge capacity remained at139.94mAh·g-1and the capacityretention was91.45%.In Chapter4, in order to improve the ionic conductivity of lithium iron phosphatelithium, Li4Ti5O12/Ag was synthesized by an electroless deposition method combinedwith thermal decomposition of a mixture of AgNO3. The results showed that surfacecoating of Ag on Li4Ti5O12particle improved its electronic conductivity and thereforeenhanced the performance of the circulation. The discharge capacity of the compositewere137.2mAh·g-1at0.3C rate after35cycles, and the corresponding capacityretention were88.3%, respectively. EIS test proved that surface coating of Ag onLi4Ti5O12particle could decrease its charge transfer resistance greatly. In Chapter5, a new composite material Li4Ti5O12/Li1.3Al0.3Ti1.7(PO43was wassynthesized by sol-gel method to enhance the low electronic and ironic conductivity,take advantage of the higher ionic conductivity and lower activation energy ofLi1.3Al0.3Ti1.7(PO43and the unique advantages of Li4Ti5O12. The results show that thesynthesized material is pure spinel phase. The doping with Li1.3Al0.3Ti1.7(PO43couldincrease the conductivity of the synthesized anode material, decrease Li+diffusionresistance, and dramatically increase the electrochemical performance. The optimaldoping amount in a mass of ratio was3%The Li4Ti5O12/Li1.3Al0.3Ti1.7(PO43sample hada low charge transfer resistance (159.7), The initial discharge specific capacity is186mAh·g-1at0.1C,158mAh·g-1at1C, showing that it has good cycling behavior.

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