牺牲棉纤维模板法制备褶皱状SnO2负极材料及其电化学性能

doi:10.15541/jim20140095

摘要/Abstract

摘要：

以棉纤维作为模板, 制备褶皱层状SnO₂。通过XRD、SEM、TEM、CV、恒流充放电、EIS等测试手段对材料结构、形貌和电化学性能进行了表征。结果表明: 产物具有由粒径16~21 nm的SnO₂纳米颗粒构成的褶皱状形貌。电化学测试表明该材料在电流密度70 mA/g时循环50次后放电比容量仍高达614 mAh/g, 甚至在电流密度为3000 mA/g时放电比容量仍达到405 mAh/g, 表现出优异的循环性能和倍率性能。

关键词: SnO2, 棉纤维, 模板法, 褶皱结构, 锂离子电池

Abstract:

Corrugated SnO₂ was prepared by an effective template using cotton fibers which were sacrificed during preparation. The as-prepared SnO₂ samples were characterized by XRD, SEM, TEM, CV, galvanostatical method and EIS. The results show that the corrugated SnO₂ is composed of nanopaticles with size of 16-21 nm. The as-obtained corrugated SnO₂ electrodes can deliver a discharge capacity of 614 mAh/g at current density of 70 mA/g after 50 cycles. Even at the current density of 3 A/g the products can still deliver a high reversible discharge capacity of 405 mAh/g. As lithium storage materials, the corrugated SnO₂ shows stable cyclability and good rate capability.

Key words: tin oxides, cotton fibers, template method, corrugated structure, lithium-ion batteries

中图分类号:

TQ174

吁霁, 夏媛. 牺牲棉纤维模板法制备褶皱状SnO₂负极材料及其电化学性能[J]. 无机材料学报, 2014, 29(11): 1127-1132.

YU Ji, XIA Yuan. Synthesis of Corrugated SnO₂ by Cotton Fibers Template Method and Its Electrochemistry Performance[J]. Journal of Inorganic Materials, 2014, 29(11): 1127-1132.

图/表 8

图1 样品c-SnO2 (a)和n-SnO2 (b)的XRD图谱

Fig. 1 XRD patterns of c-SnO2 (a) and n-SnO2 (b)

图2 样品棉纤维(a)、n-SnO2(b)和c-SnO2 (c, d)的SEM照片

Fig. 2 SEM images of the cotton fibers (a), n-SnO2 (b) and c-SnO2 (c, d)

图3 样品c-SnO2的TEM(a)和HRTEM (b)照片

Fig. 3 TEM (a) and HRTEM (b) images of c-SnO2

图4 c-SnO2在0.2 mV/s扫速下0~3 V间的循环伏安曲线

Fig. 4 CV curve of the c-SnO2 electrode between 0-3 V with a scan rate of 0.2 mV/s

图5 样品n-SnO2与c-SnO2的充放电曲线(a)和循环性能曲线(b)

Fig. 5 Charge-discharge profiles of selected cycles (a) and cycling performance (b) of the samples c-SnO2 and n-SnO2

图6 样品c-SnO2与n-SnO2在不同电流密度下的循环性能

Fig. 6 Rate capability of c-SnO2 and n-SnO2

图7 样品c-SnO2与n-SnO2 5次循环后的阻抗图和其模拟电路图

Fig. 7 EIS curves of c-SnO2 and n-SnO2 after 5 cycles. The insert shows the equivalent circuit model

表1 阻抗模拟电路的参数

Table 1 Parameters of equivalent circuit model

Samples	R_?/(?•cm^-2)	R₁/(?•cm^-2)	R_ct/(?•cm^-2)
c-SnO₂	3.561	740.9	68.64
n-SnO₂	1.418	7515.0	146.80

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牺牲棉纤维模板法制备褶皱状SnO₂负极材料及其电化学性能

Synthesis of Corrugated SnO₂ by Cotton Fibers Template Method and Its Electrochemistry Performance

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