High performance freestanding stainless steel net@MoS2 lithium-ion battery anode material
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摘要: 为了提高MoS2作为Li离子电池负极材料整体的导电性和稳定性，将纳米化的MoS2与其它导电性好的材料进行复合，通过水热法在导电基底不锈钢网(Stainless steel net, SS)上原位合成了一层MoS2纳米花，制备了无粘结剂的自支撑结构的SS@MoS2负极材料。纳米花状的MoS2和导电性优异的SS提高了电子和Li离子的扩散速率，同时改善了电极的反应动力学。当作为Li离子电池负极材料时，SS@MoS2电极表现出优异的储Li性能，特别是具有显著的大倍率充放电性能，即在1 000 mA/g的大电流密度下循环600次，比容量仍保持在862.1 mA·h/g。Abstract: In order to improve the electrical conductivity and stability of the MoS2 electrode material of lithium-ion batteries (LIBs), the nano-MoS2 is compounded with other more conductive materials. MoS2 nanoflowers were prepared in situ grown on stainless steel net (SS) via a facile hydrothermal method, developing SS@MoS2 anode material with self-supporting structure without binder. The nanoflowers structure and the enhanced conductivity of MoS2 by SS can ameliorate the diffusion rate of both Li and electrons, as well as the electrode reaction kinetics. The SS@MoS2 electrodes display excellent lithium storage performance, especially remarkable high-rate capabilities in LIBs. And the specific capacity of 862.1 mA·h/g can still be obtained after 600 cycles at a high current density of 1 000 mA/g.
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Key words:
- lithium-ion batteries /
- MoS2 /
- freestanding /
- nanoflowers /
- anode
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图 2 SS@MoS2不同分辨率的SEM图像((a)~(c))和断面SEM图像(d)
Figure 2. SEM images of SS@MoS2 at different magnifications ((a)-(c)) and cross-section SEM image (d)
图 4 SS@MoS2中Mo 3d (a)和S 2p (b)结合能附近的高分辨XPS图谱
Figure 4. High-resolution XPS spectra of Mo 3d(a) and S 2p (b) of SS@MoS2
图 5 SS@MoS2电极的前五次循环伏安曲线
Figure 5. Cyclic voltammogram curves of SS@MoS2 electrode in the first five cycles
图 6 SS@MoS2和纯MoS2电极在电流密度为100 mA/g时的循环性能（a）和SS@MoS2电极相应的充放电曲线（b）
Figure 6. Cycling performance of SS@MoS2 and pure MoS2 electrodes at current density of 100 mA/g (a) and charge-discharge voltage profiles of SS@MoS2 (b)
图 7 SS@MoS2电极在1 000 mA/g大电流密度下的长循环性能
Figure 7. Cycling performance of SS@MoS2 electrode at high current density of 1 000 mA/g
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