高性能自支撑CuS/SnS<sub>2</sub>锂电池负极材料

张鹏; 刘洋; 陈明华; 孙凤莲

doi:10.13801/j.cnki.fhclxb.20200921.002

高性能自支撑CuS/SnS₂锂电池负极材料

doi: 10.13801/j.cnki.fhclxb.20200921.002

张鹏^1,,
刘洋^1, ,,
陈明华^2,,
孙凤莲^1,

1.
哈尔滨理工大学　材料科学与工程学院，哈尔滨 150080
2.
哈尔滨理工大学　应用科学学院，哈尔滨 150080

基金项目: 国家自然科学基金(51604090)；黑龙江省自然科学基金资助项目(LH2020E089)

详细信息

通讯作者:
刘洋，博士，副教授，硕士生导师，研究方向为微电子封装、新材料研发　E-mail：yang_liu@hrbust.edu.cn

中图分类号: TB383.1
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- 被引次数: 0
出版历程
- 收稿日期: 2020-07-09
- 录用日期: 2020-09-07
- 网络出版日期: 2020-09-21
- 刊出日期: 2021-03-15

High-performance self-supporting CuS/SnS₂ lithium battery anode material

ZHANG Peng^1
,,
LIU Yang^{1
, ,},
CHEN Minghua^2
,,
SUN Fenglian^1
,

1.
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China
2.
School of Applied Science, Harbin University of Science and Technology, Harbin 150080, China

摘要

摘要: 过渡金属硫化物作为锂电池负极材料具有极高比容量，但其制备的电极普遍存在导电性差、体积变化大等问题，本研究设计了一种新型的自支撑CuS/SnS₂镂空片状锂电池负极材料，以导电碳布作为基底，生长包覆CuS/SnS₂镂空纳米片，具备特殊的纳米包覆结构及双金属协同效应，使其在保持较高比容量的同时具备良好的循环稳定性，整体电化学性能优异。研究不同Cu/Sn含量对CuS/SnS₂负极材料电化学性能的影响，最佳配比的CuS/SnS₂负极材料在0.2 A·g⁻¹电流密度下循环50次后比容量为1480 mAh·g⁻¹，库伦效率稳定在99.5%，在2 A·g⁻¹电流密度下循环200次后比容量仍能保持在697 mAh·g⁻¹，库伦效率为99.8%。
- 过渡金属硫化物 /
- CuS/SnS₂ /
- 纳米结构 /
- 负极材料 /
- 锂电池
Abstract: The transition metal sulfide is an extremely high capacity anode material for lithium ion batteries. In this paper, a new kind of hollow out nanosheets lithium battery anode material with self-supporting CuS/SnS₂ lithium battery anode material was designed and prepared. The conductive carbon cloth was used as the substrate to grow and clad CuS/SnS₂ hollow out nanosheets. It has high specific capacity, good cycling performance and excellent electrochemical performance. The effects of different Cu/Sn contents on electrochemical properties were investigated. The specific capacity of CuS/SnS₂ anode material is 1480 mAh·g⁻¹ at 99.5% coulomb efficiency after 50 cycles under the current density of 0.2 A·g⁻¹. After 200 cycles at the large current density of 2 A·g⁻¹, the specific capacity remains at 697 mAh·g⁻¹, and the coulomb efficiency is stable at 99.8%.
- transition metal sulfide /
- CuS/SnS₂ /
- nanostructures /
- anode material /
- lithium-ion batterie

HTML全文

图 1 CuS/SnS₂负极材料的制备流程

Figure 1. Prepare process of CuS/SnS₂ anode material

TAA—Thioacetamide

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图 2 SnS₂ (a)和CuS/SnS₂ ((b)~(e))负极材料的SEM图像

Figure 2. SEM images of and SnS₂ (a) and CuS/SnS₂ anode materials ((b)–(e))

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图 3 SnS₂ (a)和CuS/SnS₂负极材料的SEM图像

Figure 3. SEM images of and SnS₂ (a) and CuS/SnS₂ anode materials ((b)–(e))

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图 4 CuS/SnS₂负极材料的TEM、选区电子衍射和HRTEM图像

Figure 4. TEM, selected area electron diffraction and HRTEM images of CuS/SnS₂ anode material

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图 5 SnS₂和CuS/SnS₂负极材料的XRD图谱

Figure 5. XRD patterns of SnS₂ and CuS/SnS₂ anode material

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图 6 SnS₂和CuS/SnS₂负极材料的电化学性能

Figure 6. Electrochemical performance of SnS₂ and CuS/SnS₂ anode materials ((a) Cyclic voltammetric curve of 5% CuS/SnS₂ (Scanning rate=0.1 mV/s); (b) Charge and discharge curve (Scanning rate=0.1 mV/s); (c) Charge and discharge curve (Scanning rate=0.1 mV/s); (d) Rate capability test under different current density; (e) Cycle performance (0.2 A/g))

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图 7 SnS₂和CuS/SnS₂负极材料的循环性能(电流密度为2 A/g)

Figure 7. Cycle performance of SnS₂ and CuS/SnS₂ anode materials (Current density of 2 A/g)

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