Al2O3-doped ZnO coating of carbon nanotubes as cathode material for lithium-sulfur batteries

被引:37
作者
Ma, Tianye [1 ]
Liu, Mengmeng [1 ]
Huang, Tao [1 ]
Yu, Aishui [2 ]
机构
[1] Fudan Univ, Lab Adv Mat, Shanghai 200438, Peoples R China
[2] Fudan Univ, Collaborat Innovat Ctr Chem Energy Mat, Shanghai Key Lab Mol Catalysis & Innovat Mat, Inst New Energy,Dept Chem, Shanghai 200438, Peoples R China
关键词
Al2O3 doping ZnO; Lithium-sulfur battery; Cathode material; Improved conductivity; HIGH-PERFORMANCE; COMPOSITES;
D O I
10.1016/j.jpowsour.2018.07.048
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Currently, lithium-sulfur (Li-S) batteries become increasingly attractive because of their high theoretical energy density and high theoretical specific capacity. In this work, high-sulfur-loading Al2O3 doping of a ZnO-modified carbon nanotube (AZO@S/CNT) composite is synthesized via the hydrothermal method and subsequent high temperature solid-state reaction. Al2O3-doped ZnO (AZO) induces a strong chemical interaction between poly-sulfides to restrain the "shuttle effect." In addition, we use a novel method to enhance the electronic conductivity of the cathode material. The Al2O3 doping of ZnO can increase the electron density in ZnO, and thus enhance its electronic conductivity. The initial discharge capacity of the cathode with 60-wt.% S reaches 1100 mAh g(-1) and the recycle capacity still remains 700 mAh g(-1) after 200 cycles at 0.2 C with a capacity fade rate of 0.18% per cycle, offering a potential candidate for practical application of high-energy-density Li-S batteries in the future.
引用
收藏
页码:75 / 82
页数:8
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