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Researches on Sn-basic Alloy and Sn-basic Composite Materials for Lithium Ion Batteries Anode

Author: ZhuXiang
Tutor: ZhangXiaoGang
School: Nanjing University of Aeronautics and Astronautics
Course: Applied Chemistry
Keywords: Lithium ion battery Anode material Sn-based alloys Carbon composite Graphene
CLC: TM912
Type: Master's thesis
Year: 2010
Downloads: 200
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Abstract


The current commercial lithium ion battery negative electrode material is a graphitized carbon material having a good cycle stability , but its capacity is small ; graphene material emerging in recent years , carbon materials , as the composition of the base element of the graphite material , the sp2 carbon atoms from the structural support of a single atomic layer of the specific physical and chemical properties , the field of the negative electrode material in lithium ion batteries also exhibit excellent performance ; Sn can reversibly alloying to alloying reaction with Li lithium storage capacity is generated great Li44Sn alloy phase , but the poor stability of many cycles . The papers by different methods of preparation of Sn-based alloys and carbon composite materials , research materials , structure , morphology , particle size , and other factors affect its charge and discharge performance , to explore an effective way to optimize the cycle performance of the Sn-based alloys anode material . (1) by a liquid phase of restoring the preparation of Sn-Co alloy nanoparticles , contrast reducing conditions found that the particle diameter of the Sn-Co alloy obtained under the conditions of the complexing agent in aqueous solution is between 20-40 nm , and component single crystal good 25 cycles capacity of 178.9 mAh / g , the retention rate of 19.1% ; milled composite obtained by the Sn-Co alloy with acetylene black carbon content of 16.7 wt% Sn-Co / C composite capacity capacity after 25 cycles 211.1 mAh / g, the retention rate was 45.3% , improve the lot of performance than Sn-Co alloy . ( 2) optimization of the reduction conditions to achieve Sn2 Co2 graphite oxide (GO) , restore , Sn-Co / redox graphene (RGO) composites , a higher degree of crystallinity of Sn and Sn-Co alloy , RGO to low - graphitized amorphous carbon material present in the form having a pleated structure . Its initial irreversible capacity loss of only 38.1% , and maintained a discharge capacity of 547.6 mAh / g after 80 cycles , cycle stability and high rate charge- discharge performance are greatly improved . (3) By resorcinol - formaldehyde gel formed Sn4 clad formation precursor , its carbonization treatment to obtain a Sn / C composite , and Comparative GO obtained modified precursor Sn / C Composite was the performance results show that the structure of the Sn / C composite by the the carbon ball load Sn before the modification becomes cloud curled coated Sn , Sn and a carbon substrate binding force to strengthen such capacity characteristics and cycle stability of the complexes The improved, modified Sn / C composite by 35 cycles after the capacity is almost no attenuation , 90 cycles capacity maintained at 220 mAh / g or more .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery
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