(中南大學 化學化工學院 有色金屬資源化學教育部重點實驗室，長沙 410083)
摘 要: 用直接沉淀法制備前軀體MSn(OH)6，把導電炭黑(Super-P)與前軀體一起球磨后煅燒，合成MSnO3(M=Ca，Sr，Ba)，并系統(tǒng)研究其作為鋰離子電池負極材料的電化學性能。用SEM和XRD表征產(chǎn)物的形貌和結(jié)構(gòu)，用恒電流充放電和循環(huán)伏安測試產(chǎn)物的電化學性能。結(jié)果表明：CaSnO3、SrSnO3和BaSnO3的首次充電容量分別為624.9、383.8和330.1 mA∙h/g；CaSnO3經(jīng)過20次循環(huán)之后，在0.1C、0.5C、1C倍率下的充電容量分別為510、390和258 mA∙h/g，而球磨CaSnO3相應(yīng)地分別為413、297、183 mA∙h/g。這說明加Super-P球磨的CaSnO3樣品循環(huán)穩(wěn)定性和高倍率性能均得到較大提高。
關(guān)鍵字: 鋰離子電池；負極；錫酸鹽；復合氧化物；納米材料
（Key Laboratory of Resource Chemistry of Nonferrous Metals, Ministry of Education,
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:The precursors of MSn(OH)6 (M=Ca, Sr, 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.
Key words: lithium ion batteries; anode; stannate; composite oxides; nanomaterial
