【摘 要】
：
以单质硫为正极的锂硫二次电池中,硫正极具有极高的理论容量(1675mAhg-1)和能量密度(2600Wh kg-1),远大于现阶段使用的商业化二次电池,且单质硫具有资源丰富、环境友好等优点,使得该体系具有极大的商业价值.研究表明,由于“穿梭效应”、单质硫及其放电产物的绝缘性以及硫与多硫化锂在充放电过程中体积变化等现象的存在,制约了二次锂硫电池的性能提高.目前将多孔碳材料应用于硫正极可显著改善电池性
【机 构】
：
哈尔滨工业大学化工学院特种化学电源研究所,黑龙江,哈尔滨,150001
论文部分内容阅读
以单质硫为正极的锂硫二次电池中,硫正极具有极高的理论容量(1675mAhg-1)和能量密度(2600Wh kg-1),远大于现阶段使用的商业化二次电池,且单质硫具有资源丰富、环境友好等优点,使得该体系具有极大的商业价值.研究表明,由于“穿梭效应”、单质硫及其放电产物的绝缘性以及硫与多硫化锂在充放电过程中体积变化等现象的存在,制约了二次锂硫电池的性能提高.目前将多孔碳材料应用于硫正极可显著改善电池性能.其中科琴黑(Ketjen black EC-600,CKB)是一种具有独特形态和极高比表面积的商业化多孔导电炭黑,能够减少离子、电子的传导距离,增加硫的利用率,减小自放电和多硫化物离子穿梭效应.Zheng[1]等人研究了常温下KB/S材料电化学性能,得到较好性能,但对操作温度的影响并没有解释.不同的操作温度对体系中穿梭效应,离子的传导速率以及中间产物的溶解性都有巨大影响.为解释不同操作温度下锂硫电池性能的变化,作者提出相应的机理解释.
其他文献
Supercapacitors are a new class of energy storage devices that can store a large amount of charge,and deliver it at high power ratings.[1] Hierarchically porous carbons are currently preferred as the
We report a new environmentally-friendly synthetic strategy for large-scale preparation of 16 nm-ultrathin NiCo based layered double hydroxides (LDHs).The Ni50Co50-LDH electrode exhibited excellent sp
Mesoporous and microsrystal T-Nb2O5 was synthesized by a solvent evaporation induced self-assembly method (EISA) using nano-crystalline cellulose rod-like structure as three-dimensional cross linked s
The simple synthesis of nanostructures with high charge-carrier transport is an important aim for the applications in supercapacitors [1-5].Here,we report a novel hybrid electrode material with mesopo
Lithium-sulfur batteries hold great promise for serving as next generation high energy density batteries.However,the shuttle of polysulfide induces rapid capacity degradation and poor cycling stabilit
In recent years,rechargeable lithium-ion battery has occupied the dominant position in the fields of smallmobile consumer electronics products,and also shown prospects remarkable of electric vehicles
Lithium-sulfur (Li-S) batteries have recently been considered as the one of the prospective candidates for high performance energy storage technologies in terms of their high specific capacity (1675 m
与传统锂离子电池相比,锂硫电池的优势更多地体现在理论比容量高和成本低,但其长期循环稳定性则较差[1].硫与热裂解聚丙烯腈的复合物(S/pPAN)是一种很有潜力的正极材料[2],并且以水性羰基化的贝塔环糊精作为粘结剂时循环稳定性较好[3],但其硫含量还有待于进一步提高.
As the conventional Li-ion batteries are approaching its theoretical limits.Li-S batteries have attractedmore and more attention for their high energy density(2600 Wh kg-1).Carbon materials with vario
Magnesium alloy has great potential in the energy field because of its high electronegativity,chemical activity and high energy density.Usually the anode material is MnO2.In this paper,we have studied