One-pot synthesis of core-shell-structured tin oxide-carbon composite powders by spray pyrolysis for use as anode materials in Li-ion batteries
One-pot synthesis of core-shell-structured tin oxide-carbon composite powders by spray pyrolysis for use as anode materials in Li-ion batteries
复制标题
DOI：
10.1016/j.carbon.2015.03.010
复制
发表时间：
2015-07-01
期刊：
影响因子：
10.9
通讯作者：
Kang, Yun Chan
中科院分区：
文献类型：
--
作者：
Hong, Young Jun;Kang, Yun Chan
以草酸锡和聚乙烯吡咯烷酮(PVP)为原料，采用一锅法喷雾热解法制备了SnO2和SnO混合四方晶体的核-壳结构SnO2-C复合粉末。这种聚集体由SnOx纳米晶(几十纳米)组成，均匀地覆盖着一层无定形碳层。裸SnO2和SnOx-C复合粉末在1Ag(-1)电流密度下的首次放电容量分别为1473和1667 mA h g(-1)，500次循环后的放电容量分别为78和1033 mA h g(-1)。SnOx-碳复合粉末即使在500次循环后仍保持其球形形貌。另一方面，裸露的SnO2粉末在循环后会破碎成几块。SnOx-C复合粉末的结构稳定，即使在2Ag(-1)的高电流密度下循环500次后，仍具有低的电荷转移电阻和高的锂离子扩散速率。因此，SnOx-碳复合粉末的电化学性能优于尺寸细小的SnO2裸粉末。(C)2015爱思唯尔有限公司。保留所有权利。
Core-shell-structured tin oxide-carbon composite powders with mixed SnO2 and SnO tetragonal crystals are prepared by one-pot spray pyrolysis from a spray solution with tin oxalate and polyvinylpyrrolidone (PVP). The aggregate, made up of SnOx nanocrystals (several tens of nanometers), is uniformly coated with an amorphous carbon layer. The initial discharge capacities of the bare SnO2 and SnOx-carbon composite powders at a current density of 1 A g(-1) are 1473 and 1667 mA h g(-1), respectively; their discharge capacities after 500 cycles are 78 and 1033 mA h g(-1), respectively. The SnOx-carbon composite powders maintain their spherical morphology even after 500 cycles. On the other hand, the bare SnO2 powder breaks into several pieces after cycling. The structural stability of the SnOx-carbon composite powders results in a low charge transfer resistance and high lithium ion diffusion rate even after 500 cycles at a high current density of 2 A g(-1). Therefore, the SnOx-carbon composite powders have superior electrochemical properties compared with those of the bare SnO2 powders with a fine size. (c) 2015 Elsevier Ltd. All rights reserved.