Boron Nitride Nanotube-Sulfur-Polysulfone Composite Cathode of Lithium-Sulfur Batteries with an Ultra-stability and Excellent Capacity
Rechargeable lithium-sulfur(Li–S)batteries have drawn increasing attention due to their exceptionally high theoretical specific energy,environmental friendliness,low cost and natural abundance of elemental sulfur.However,the dissolution of intermediate polysulfide products formed during the charge/discharge process which results in the cathode structure damage and the well-known shuttle phenomenon cause severe capacity fading and lower coulombic efficiency.Boron nitride nanotubes(BNNTs)are one of hardest materials known so far.It has attracted much attention due to its advantageous properties including high thermal conductivity,superb oxidation resistance,excellent chemical stability and extraordinary mechanical strength.Bamboo-like BNNTs possess a high percentage of edge-plane sites along the surface and thinner wall compared to the other nanostructures of BN nanotubes,resulting in more excellent elastic properties,a higher hydrogen uptake amount at higher pressure,and more outstanding mechanical stiffness.In this study,the as-prepared porous bamboo-like BNBTs with abundant and uniform micropores have been employed to design and prepare novel porous BNNTs-S-polysulfone composites for Li-S batteries.These composites exhibit a good electrochemical performance in terms of specific capacity,cycling stability.The attractive electrochemical performance of the porous BNNTs-S-polysulfone nanocomposite is attributed to its unique structure,in which the porous bamboo-like BNNTs provide a sufficient free space to accommodate the volume expansion of sulfur,and their tough and firm structure greatly enhances mechanical strength for effectively avoiding the collapse of the whole electrode during cycling and high pore volume is beneficial to achieve high sulfur loadings,and a thin polymer coating on the porous bamboo-like BNNTs minimizes polysulfides dissolution and inhibits the leakage of polysulfide during cycling.
Li-S batteries boron nitride nanotubes micropores material
Fan Ye Cai Qiran Tao Tao Rahman Md Mokhlesur Li Luhua Parratt Andrew Chen Ying
Deakin University Deakin University;Guangdong University of Technology
国际会议
北京
英文
2090-2094
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）