Sun Qingqing, Chen Kaixiang, Liu Yubin, Li Yafeng, Wei Mingdeng
State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Xueyuan Road 2, Fuzhou, Fujian, 350116, P.R. China.
Institute of Advanced Energy Materials, Fuzhou University, Xueyuan Road 2, Fuzhou, Fujian, 350116, P.R. China.
Chemistry. 2017 Nov 16;23(64):16312-16318. doi: 10.1002/chem.201703130. Epub 2017 Oct 30.
Although lithium-sulfur (Li-S) batteries are among the most promising rechargeable batteries in the field of energy-storage devices, their poor cycling performance restricts their potential applications. Polar materials can improve the cycling stability owing to their inherent strong chemical interaction with polysulfides. Herein, novel rutile TiO mesocrystals (RTMs) are employed as the host for sulfur in Li-S batteries; the RTMs display a stable cycling performance with a capacity retention of 64 % and a small average capacity decay rate of 0.12 % per cycle over 300 cycles at 1 C rate. The good electrochemical properties are attributed to the interior ordered nanopores of the RTMs, which can effectively limit the dissolution of polysulfides, and the ultrafine nanowires in RTMs, which shorten the path for lithium-ion transport effectively.
尽管锂硫（Li-S）电池是储能设备领域中最具前景的可充电电池之一，但其较差的循环性能限制了其潜在应用。极性材料由于其与多硫化物固有的强化学相互作用，可提高循环稳定性。在此，新型金红石TiO介晶（RTMs）被用作锂硫电池中硫的主体；RTMs在1 C倍率下300次循环中表现出稳定的循环性能，容量保持率为64%，平均每次循环的容量衰减率仅为0.12%。良好的电化学性能归因于RTMs内部有序的纳米孔，其可有效限制多硫化物的溶解，以及RTMs中的超细纳米线，其有效缩短了锂离子传输路径。
