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Powder metallurgical 3d nickel current collectors with plasma-induced Ni3N nanocoatings enabling long-life and dendrite-free lithium metal anode

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Journal of Energy Chemistry 2022年第9期31卷 149-157,I0005页

作者： Piao Qing Zhibin Wu Yuejiao Chen Fengcheng Tang Hao Yang Libao Chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina

Building three-dimensional(3d) current collectors is a promising strategy to surmount the bottlenecks of lithium metal anodes(LMAs), but the regulation methodology of a 3d current collector has seldom been considered comprehensively concerning both skeleton architectures and surface coatings. Herein, a robust porous 3d nickel skeleton(NS) with lithiophilic NiN nanocoatings(NiN@NS) is synthesized via an integrative route of powder metallurgy/plasma-enhanced nitridation technics. The facile powder metallurgical method facilitates the adjustment of NS architectures toward sufficient electrolyte adsorption and even current density distribution, while the followed plasma-enhanced chemical vapor deposition(PECVd) method can induce compact NiN nanocoatings on NS, which reduces the Li nucleation overpotential, accelerates the Li-ion transfer, and facilitates a highly reversible oriented texture of Li deposition morphology owing to the dense and homogenous deposition of Li into the pores. The optimized NiN@NS current collector shows a high averaged Coulombic efficiency(CE) of 98.8% over 350cycles, a prolonged lifespan of 1000 h(at 2 mA cm^(-2)) in symmetrical cells, together with the significant performance in full cells. The ingenious methodology reported in this work can also be broadly applicable for the controllable production of other 3d skeletons with nitride nanocoatings for various applications.

关键词： 3d current collector Ni3N Lithium metal anode Plasma Powder metallurgy

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Highly elastic wrinkled structures for stable and low volume-expansion lithium-metal anodes

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Science China Materials 2021年第11期64卷 2675-2682页

作者： Wenwen Lu Huicong Yang Jing Chen Chihang Sun Feng Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Lithium(Li)metal is promising for high energy density batteries due to its low electrochemical redox potential and high specific ***,the formation of dendrites and its tendency for large volume expansion during plating/stripping restrict the application of Li metal in practical *** this work,we developed reduced graphene oxide-graphitic carbon nitride(rGO-C3N4,GCN)with highly elastic and wrinkled structure as the current *** site C3N4 in GCN could reduce the nucleation *** addition,this material effectively inhibited electrode expansion during *** the same time,due to its high elasticity,GCN could release the stress induced by Li deposition to maintain structural integrity of the *** anodes with GCN exhibited small volume expansion,high Coulombic efficiency(CE)of 98.6%within 300 cycles and long cycling life of more than 1700 *** work described and demonstrated a new approach to construct flexible current collectors for stable lithium-metal anodes.

关键词： lithium-metal anode 3d current collector high elasticity

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