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一个易于合成的NiCo₂S₄与两个相互增强的活性站点,用于高性能硫电池

Hongyuan Xu^1,2,3, Guanghui Xu^1,2,3, Shengjun Zhai⁴

¹Suzhou Academy, Xi'an Jiaotong University, Suzhou, Jiangsu 215123, China.

ACS applied materials & interfaces

|December 6, 2023

概括

研究人员开发了一种新的和硫化物纳米结构,以克服硫电池的局限性. 这种催化剂增强了聚硫化物吸附和转化,提高了电池的稳定性和容量,用于实际应用.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

硫电池 (LSB) 面临着多硫化物穿效应和缓慢的转换动力学的挑战,阻碍了商业化.
开发先进的阴极材料对于提高LSB性能和周期寿命至关重要.

研究的目的:

设计和合成一个缺陷丰富的三维状堆叠硫化 (D-NiCo2S4) 纳米结构.
研究D-NiCo2S4在LSB中的聚硫化物吸附和转化中的协同催化机制.
为了评估使用D-NiCo2S4@S阴极的LSB的电化学性能.

主要方法:

合成一个三维的板状堆叠的和硫化物纳米结构 (D-NiCo2S4) 与操纵的阴离子位点和晶格缺陷.
实验性表征和密度函数理论 (DFT) 计算以阐明吸附和催化机制.
用D-NiCo2S4@S阴极测试Li-S电池的电化学测试,包括在高硫负载下测量循环稳定性和容量.

主要成果:

D-NiCo2S4纳米结构表现出一个协同机制,涉及Ni3+用于LiPS的定和Co3+用于高效的催化转换.
晶体缺陷和纳米结构的扭曲暴露了更活跃的部位,增强了氧化还原反应动力学.
带有D-NiCo2S4@S阴极的LSB显示出出色的循环稳定性 (1000个循环与0.05%的衰变率) 和高特异性容量 (最初为1001.12 mAh g-1,1000个循环后为655.31 mAh g-1).
高初始面积容量 (3.15 mAh cm-2) 是通过高硫负载 (4.2 mg cm-2) 实现的.

结论:

富含缺陷的D-NiCo2S4纳米结构有效地抑制了穿效应,并加速了聚硫化物转化动力学.
这种双金属硫化物催化剂为设计高性能LSB阴极提供了可行的策略.
该研究提供了一种合理的方法,用于构建具有增强特定容量和面积容量的LSB阴极.

关键词:

缺陷工程是什么?缺陷工程是什么?硫电池是硫电池的一种.聚硫化物转换过程中的多硫化物.自组装的NiCo2S4S4可以自组装穿效应的穿效应

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