NiS2 nanoparticles anchored on open carbon nanohelmets as an advanced anode for lithium-ion batteries,Nanoscale Advances

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NiS2 nanoparticles anchored on open carbon nanohelmets as an advanced anode for lithium-ion batteries
Nanoscale Advances ( IF 4.6 ) Pub Date : 2019/12/13 , DOI: 10.1039/c9na00661c
D D Yang ₁ , M Zhao ₁ , R D Zhang ₁ , Y Zhang ₁ , C C Yang ₁ , Q Jiang ₁

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Low intrinsic conductivity and large volume expansion seriously restrict the efficient lithium storage performance of metal sulfides. Here, we fabricate a hybrid material of NiS₂ nanoparticles/carbon nanohelmets (NiS₂/CNHs) to address the above issues. As an anode material in lithium-ion batteries, NiS₂/CNHs exhibit excellent cycling stability (490 mA h g⁻¹ after 3000 cycles at 5 A g⁻¹) and rate properties (412 mA h g⁻¹ at 10 A g⁻¹), outperforming other NiS_x-based anode materials. These remarkable performances originate from the three-dimensional helmet-like integrated architecture of NiS₂/CNHs, which reduces the electrode resistance due to the tight combination between NiS₂ and CNHs, provides efficient diffusion paths for the electrolyte and Li⁺ owing to the amorphous nanoporous carbon structure, and significantly mitigates the aggregation and buffers the large volumetric expansion of NiS₂ nanoparticles upon long-term cycling thanks to the open three-dimensional architecture and well-dispersed NiS₂ nanoparticles on it.

中文翻译：

锚定在开放碳纳米头盔上的 NiS2 纳米颗粒作为锂离子电池的先进阳极

较低的本征电导率和较大的体积膨胀严重限制了金属硫化物的高效储锂性能。在这里，我们制造了NiS ₂纳米颗粒/碳纳米头盔（NiS ₂ /CNHs）的混合材料来解决上述问题。作为锂离子电池负极材料，NiS ₂ /CNHs表现出优异的循环稳定性（在5 A g ^-1下循环3000次后为490 mA hg ^-1 ）和倍率性能（在10 A g ^-1下为412 mA hg ^-1 ），优于其他 NiS _x基负极材料。这些卓越的性能源于NiS ₂ /CNHs的三维头盔式集成架构，由于NiS ₂和CNHs之间的紧密结合，降低了电极电阻，由于非晶态，为电解质和Li ⁺提供了有效的扩散路径。纳米多孔碳结构，由于开放的三维结构和其上分散良好的NiS ₂纳米颗粒，显着减轻了聚集并缓冲了NiS ₂纳米颗粒在长期循环时的大体积膨胀。

更新日期：2020-02-13

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