用于锂离子电池的高容量负极材料SnO₂/石墨烯复合材料的制备与表征

Fabrication and Characterization of SnO₂/Graphene Composites as High Capacity Anodes for Li-Ion Batteries.

作者信息

Dhanabalan Abirami, Li Xifei, Agrawal Richa, Chen Chunhui, Wang Chunlei

机构信息

Department of Mechanical and Materials Engineering, Florida International University, Miami 33174, FL, USA.

出版信息

Nanomaterials (Basel). 2013 Nov 15;3(4):606-614. doi: 10.3390/nano3040606.

DOI:10.3390/nano3040606

PMID:28348355

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5304589/

Abstract

Tin-oxide and graphene (TG) composites were fabricated using the Electrostatic Spray Deposition (ESD) technique, and tested as anode materials for Li-ion batteries. The electrochemical performance of the as-deposited TG composites were compared to heat-treated TG composites along with pure tin-oxide films. The heat-treated composites exhibited superior specific capacity and energy density than both the as-deposited TG composites and tin oxide samples. At the 70th cycle, the specific capacities of the as-deposited and post heat-treated samples were 534 and 737 mA·h/g, respectively, and the corresponding energy densities of the as-deposited and heat-treated composites were 1240 and 1760 W·h/kg, respectively. This improvement in the electrochemical performance of the TG composite anodes as compared to the pure tin oxide samples is attributed to the synergy between tin oxide and graphene, which increases the electrical conductivity of tin oxide and helps alleviate volumetric changes in tin-oxide during cycling.

摘要

采用静电喷雾沉积（ESD）技术制备了氧化锡与石墨烯（TG）复合材料，并将其作为锂离子电池的负极材料进行测试。将沉积态的TG复合材料的电化学性能与热处理后的TG复合材料以及纯氧化锡薄膜进行了比较。热处理后的复合材料比沉积态的TG复合材料和氧化锡样品都表现出更高的比容量和能量密度。在第70次循环时，沉积态和热处理后样品的比容量分别为534和737 mA·h/g，沉积态和热处理后复合材料的相应能量密度分别为1240和1760 W·h/kg。与纯氧化锡样品相比，TG复合负极的电化学性能得到改善，这归因于氧化锡与石墨烯之间的协同作用，这种协同作用提高了氧化锡的电导率，并有助于减轻循环过程中氧化锡的体积变化。