基于高活性碳纳米管海绵体载硫的锂硫电池

doi:10.11901/1005.3093.2020.091

材料研究学报

2021, Vol. 35

Issue (1): 65-71 DOI: 10.11901/1005.3093.2020.091

研究论文

本期目录 | 过刊浏览

基于高活性碳纳米管海绵体载硫的锂硫电池

张明, 王志勇, 罗琴, 代正昆, 黎业生(

), 吴子平(

)

江西理工大学材料冶金化学学部赣州 341000

Highly Activated Carbon Nanotube Sponges Deposited with Sulfur for Lithium-sulfur Batteries

ZHANG Ming, WANG Zhiyong, LUO Qin, DAI Zhengkun, LI Yesheng(

), WU Ziping(

)

Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China

引用本文:

张明, 王志勇, 罗琴, 代正昆, 黎业生, 吴子平. 基于高活性碳纳米管海绵体载硫的锂硫电池[J]. 材料研究学报, 2021, 35(1): 65-71.
Ming ZHANG, Zhiyong WANG, Qin LUO, Zhengkun DAI, Yesheng LI, Ziping WU. Highly Activated Carbon Nanotube Sponges Deposited with Sulfur for Lithium-sulfur Batteries[J]. Chinese Journal of Materials Research, 2021, 35(1): 65-71.

全文: PDF(5674 KB) HTML

摘要:

用CVD法制备的碳纳米管(CNTs)之间的相互吸引，将其堆叠成具有网状结构、多孔及高活性等优点的CNT海绵体(CNTS)。于是，硫蒸气可在CNTs管束上形核沉积并与其紧密接触，使正极电子的高速传输从而提高电池的倍率性能；用XRD、SEM、拉曼光谱等手段测试CNTS载硫前后的极片，考察了硫在CNTs表面的分布和载硫对其结构的影响；对用极片组装的电池进行电化学测试，结果表明：在0.16 A·g^-1小电流密度下放电比容量高达1250 mAh·g^-1，在1.58 A·g^-1大电流密度下放电比容量仍稳定在823 mAh·g^-1，表明这种锂硫电池具有优异的倍率性能。电池的长循环测试结果表明：每圈容量衰减率为0.22%，表明这种电池还具有良好的循环稳定性，衰减率较低。

关键词 ：无机非金属材料, 碳纳米管, 锂硫电池, 硫蒸气, 高活性, 循环稳定性

Abstract：

Carbon nanotubes (CNTs) prepared by CVD method are easily to attract and stack into sponges. The obtained CNT sponges (CNTS) show entangled networks, porosity and high activity. Due to these properties of the CNTS, sulfur vapor can deposite and nucleate on the CNT bundles to form electrode with tight contact structure, thereby high efficiency of electron transfer in the electrode and rate capability of battery based on the electrode can be realized. The distribution of sulfur and the structure of CNTs after sulfur deposition have been investigated through XRD, SEM, Raman spectroscopy and others. In addition, the electrochemical performances of the battery based on the electrode have been tested. The results show that the battery presents discharge specific capacity of 1250 mAh·g^-1 at current density of 0.16 A·g^-1, and the specific capacity is stable at 823 mAh·g^-1as the current density increased to 1.58 A·g^-1, indicating a remarkable rate capability of the battery. Further, the cycling capacities of the battery have been also measured. The results show that the attenuation of each cycle capacity is only 0.22%, indicating an excellent cyclic stability of the battery based on the electrode.

Key words： inorganic non-metallic materials carbon nanotube lithium-sulfur battery sulfur vapor high activated cyclic stability

收稿日期: 2020-03-24

ZTFLH:

TQ152

基金资助:国家自然科学基金(51861009);江西省教育厅科技重点项目(GJJ160596)

作者简介: 张明，男，1995年生，硕士生

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链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2020.091 或 https://www.cjmr.org/CN/Y2021/V35/I1/65

图1 CNTS的合成装置和CNTS实物

图2 制备电极的示意图和电极的实物照片

图3 不同样品的SEM照片和管径分布

图4 CNTS@S的EDS测试结果

图5 CNTS载硫前后的结构

图6 电池的电化学性能和化成后交流阻抗图谱

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