摘要
SnO_2因具有较高的理论比容量而视为最有希望的锂离子电池负极材料之一,但其低的导电性以及插锂/脱离过程中大的体积变化限制了它在锂电中的应用。因此,本文以SnCl_4·5H_2O、氧化石墨烯、尿素、硫氰酸铵为原料,通过水热和热处理相结合的方法制备了SnO_2/N,S-rGO复合材料。该材料用做锂离子电池负极时,在电流密度为200mA·g^(-1)下,循环120圈后,可逆容量高达1266.3mAh·g^(-1);在1A/g的电流密度下,循环150圈后,容量保持在871mAh·g^(-1);当电流密度高达5A·g^(-1)时,可逆容量为577mAh·g^(-1),表现了较好的储锂性能。该材料储锂性能的提高得益于氮、硫共掺杂的石墨烯和SnO_2的协同效应以及其层级结构。
Although Tin dioxide has been regarded as one of the most promising anode materials for lithium ion battery(LIBS)due to its high theoretical capacity,its poor conductivity and huge volume variation during lithiation/delithiation process prevent the practical application in LIBS.Herein,SnO_2/N,S-rGO nanocomposites are prepared by a combination of hydrothermal and calcination method using SnCl_4·5 H_2 O,graphene oxide,and urea as the raw materials.When evaluated as an anode materials for lithium ion batteries,SnO_2/N,S-rGO nanocomposites deliever a capacity of 1266.3 mAh·g^(-1) at 200 mA·g^(-1) after 200 cycles;Moreover,the capacity could remain 871 mAh·g^(-1) at 1 A·g^(-1) over 150 cycles,and 577 mAh·g^(-1) at a high current density of 5 A·g^(-1),exhibiting good lithium storage properties.The improvement of performance benefit from the synergistic effect of N,S-codoped graphene(NSG)and SnO_2,coupled with layered structure.
出处
《电池工业》
CAS
2018年第1期15-20,共6页
Chinese Battery Industry
关键词
锂离子电池
氮硫共掺杂
石墨烯
Li-ion battery
Nitrogen
sulfur co-doped
Graphene
