Li-S Chemistry of Manganese Phosphides Nanoparticles With Optimized Phase.
Li-S Chemistry of Manganese Phosphides Nanoparticles With Optimized Phase.
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DOI：
10.1002/advs.202207470
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发表时间：
2023-03
期刊：
影响因子：
15.1
通讯作者：
Zhu, Jinliang
中科院分区：
文献类型：
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作者：
Deng, Qiao;Dong, Xinji;Shen, Pei Kang;Zhu, Jinliang
由于磷化锰具有不同的化学计量和相依赖的物理化学性质，因此具有目标相的磷化锰的靶向合成仍然是一个巨大的挑战。在本研究中，通过对与Mn 2+结合的磷酸盐树脂进行方便的一锅热处理，准确合成了均匀分散在多孔碳上的富磷MNP、富锰Mn 2 P及其异质结构MnP-Mn 2 P纳米颗粒。此外，它们的电化学性能进行了系统的研究，作为硫主体的锂硫电池。密度泛函理论计算表明，与MnP/C和Mn 2 P/C相比，MnP-Mn 2 P/C具有上级的吸附性能、催化性能和导电性能。MnP-Mn 2 P/C@S在5 C下表现出763.3 mAh g−1的优异容量，2000次循环后容量衰减率仅为0.013%。通过原位X射线衍射和拉曼光谱检测到多硫化物氧化还原催化MnP-Mn 2 P/C过程中的相演变产物（MnS）。当硫负载量高达8 mg cm−2时，MnP-Mn 2 P/C@S在0.2 C时的面积容量为6.4 mAh cm−2。具有MnP-Mn 2 P/C@S阴极的软包电池表现出360 Wh kg-1的初始能量密度。本论文精确地合成了富磷锰氧化物、富锰锰氧化物及其异质结构纳米微粒，并系统地研究了它们作为锂硫电池中硫主体的电化学性能和增强机理。
The targeted synthesis of manganese phosphides with target phase remains a huge challenge because of their various stoichiometries and phase‐dependent physicochemical properties. In this study, phosphorus‐rich MnP, manganese‐rich Mn2P, and their heterostructure MnP–Mn2P nanoparticles evenly dispersed on porous carbon are accurately synthesized by a convenient one‐pot heat treatment of phosphate resin combined with Mn2+. Moreover, their electrochemical properties are systematically investigated as sulfur hosts in lithium–sulfur batteries. Density functional theory calculations demonstrate the superior adsorption, catalysis capabilities, and electrical conductivity of MnP–Mn2P/C, compared with MnP/C and Mn2P/C. The MnP–Mn2P/C@S exhibits an excellent capacity of 763.3 mAh g−1 at 5 C with a capacity decay rate of only 0.013% after 2000 cycles. A phase evolution product (MnS) of MnP–Mn2P/C@S is detected during the catalysis of MnP–Mn2P/C with polysulfides redox through in situ X‐ray diffraction and Raman spectroscopy. At a sulfur loading of up to 8 mg cm−2, the MnP–Mn2P/C@S achieves an area capacity of 6.4 mAh cm−2 at 0.2 C. A pouch cell with the MnP–Mn2P/C@S cathode exhibits an initial energy density of 360 Wh kg−1. Phosphorus‐rich MnP, manganese‐rich Mn2P, and their heterostructure MnP–Mn2P nanoparticles are accurately synthesized and their electrochemical properties and enhancement mechanisms are systematically investigated as sulfur hosts in Li—S batteries.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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