Choi Seung Ho, Kang Yun Chan
Department of Materials Science and Engineering, Korea University , Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
ACS Appl Mater Interfaces. 2015 Nov 11;7(44):24694-702. doi: 10.1021/acsami.5b07093. Epub 2015 Oct 27.
Mixed metal sulfide composite microspheres with a yolk-shell structure for sodium-ion batteries are studied. Tin-molybdenum oxide yolk-shell microspheres prepared by a one-pot spray pyrolysis process transform into yolk-shell SnS-MoS2 composite microspheres. The discharge capacities of the yolk-shell and dense-structured SnS-MoS2 composite microspheres for the 100th cycle are 396 and 207 mA h g(-1), and their capacity retentions measured from the second cycle are 89 and 47%, respectively. The yolk-shell SnS-MoS2 composite microspheres with high structural stability during repeated sodium insertion and desertion processes have low charge-transfer resistance even after long-term cycling. The synergetic effect of the yolk-shell structure and uniform mixing of the SnS and MoS2 nanocrystals result in the excellent sodium-ion storage properties of the yolk-shell SnS-MoS2 composite microspheres by improving their structural stability during cycling.
研究了用于钠离子电池的具有蛋黄壳结构的混合金属硫化物复合微球。通过一锅喷雾热解工艺制备的锡钼氧化物蛋黄壳微球转变为蛋黄壳SnS-MoS₂复合微球。蛋黄壳结构和致密结构的SnS-MoS₂复合微球在第100次循环时的放电容量分别为396和207 mA h g⁻¹，从第二次循环开始测量的容量保持率分别为89%和47%。在反复的钠嵌入和脱嵌过程中具有高结构稳定性的蛋黄壳SnS-MoS₂复合微球即使在长期循环后也具有低电荷转移电阻。蛋黄壳结构以及SnS和MoS₂纳米晶体的均匀混合的协同效应通过提高其循环过程中的结构稳定性，导致蛋黄壳SnS-MoS₂复合微球具有优异的钠离子存储性能。
