C-MSnO_3(M=Ca,Sr,Ba)纳米复合物的合成及其电化学性能  

Preparation of C-MSnO_3 (M=Ca,Sr,Ba) nanocomposites and its electrochemistry performances

作　　者：胡菁[1] 卢周广[1] 唐有根[1] 黄远提[1] 

机构地区：[1]中南大学化学化工学院有色金属资源化学教育部重点实验室,长沙410083

出　　处：《中国有色金属学报》2012年第9期2614-2619,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(21001117);中南大学仪器共享开放基金资助项目

摘　　要：用直接沉淀法制备前躯体MSn(OH)6,把导电炭黑(Super-P)与前躯体一起球磨后煅烧,合成MSnO3(M=Ca,Sr,Ba),并系统研究其作为锂离子电池负极材料的电化学性能。用SEM和XRD表征产物的形貌和结构,用恒电流充放电和循环伏安测试产物的电化学性能。结果表明:CaSnO3、SrSnO3和BaSnO3的首次充电容量分别为624.9、383.8和330.1 mA.h/g;CaSnO3经过20次循环之后,在0.1C、0.5C、1C倍率下的充电容量分别为510、390和258 mA.h/g,而球磨CaSnO3相应地分别为413、297、183 mA.h/g。这说明加Super-P球磨的CaSnO3样品循环稳定性和高倍率性能均得到较大提高。The precursors of MSn（OH）6 （M=Ca, St, Ba） were prepared by direct precipitation method. After the precursors and Super-P were homogeneously mixed together by ball-milling, they were calcined to prepare the MSnO3 （M = Ca,Sr, Ba） nanocomposites. The electrochemical properties of the products as anode materials for lithium-ion batteries were systematically investigated. SEM and XRD were taken to measure the morphologies and structures of the products. The electrochemical properties of the samples were examined by galvanostatic cycling and cyclic voltammetry. The results show that the first charge capacities of CaSnO3, SrSnO3 and BaSnO3 are 624.9, 383.8 and 330.1 mA.h/g, respectively. Particularly, for the CaSnO3 sample, after 20 cycles, the remaining specific capacities are 510, 390 and 258 mA.h/g at 0.1C, 0.5C and 1C, respectively. As a comparison, for the traditional ball-milling CaSnO3 samples, the remaining specific capacities are only 413, 297, and 183 mA.h/g, respectively. The cycling stability and high rate capability of the CaSnO3 sample are substantially improved after ball-milling with Super-P.

关 键 词：电化学性能 纳米复合物 SR 合成 循环伏安 充电容量 倍率性能 直接沉淀法 

分 类 号：TM912.9[电气工程—电力电子与电力传动]