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Topology and ferroelectricity in group-V monolayers

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Chinese Physics B 2020年第5期29卷 1-12页

作者： Mutee Ur Rehman Chenqiang Hua yunhao lu State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China

The group-V monolayers(MLs)have been studied intensively after the experimental fabrication of two-dimensional(2D)graphene and black *** observation of novel quantum phenomena,such as quantum spin Hall effect and ferroelectricity in group-V elemental layers,has attracted tremendous attention because of the novel physics and promising applications for nanoelectronics in the 2D *** this review,we comprehensively review recent research progress in engineering of topology and ferroelectricity,and several effective methods to control the quantum phase transition are *** then introduce the coupling between topological orders and ferroelectric *** research directions and outlooks are discussed at the end of the *** is expected that the comprehensive overview of topology and ferroelectricity in 2D group-V materials can provide guidelines for researchers in the area and inspire further explorations of interplay between multiple quantum phenomena in low-dimensional systems.

关键词： topology ferroelectricity two-dimensional material group-V element

Scalable preparation of porous silicon nanoparticles and their application for lithium-ion battery anodes

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Nano Research 2013年第3期6卷 174-181页

作者： Mingyuan Ge Jiepeng Rong Xin Fang Anyi Zhang yunhao lu Chongwu Zhou Department of Chemical Engineering and Materials Science University of Southern California 3710 McClintockAve Los Angeles CA 90089 USA Department of Materials Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 China Department of Electrical Engineering University of Southern California 3710 McClintock Ave Los Angeles CA 90089 USA

Nanostructured silicon has generated significant excitement for use as the anode material for lithium-ion batteries; however, more effort is needed to produce nanostructured silicon in a scalable fashion and with good performance. Here, we present a direct preparation of porous silicon nanoparticles as a new kind of nanostructured silicon using a novel two-step approach combining controlled boron doping and facile electroless etching. The porous silicon nanoparticles have been successfully used as high performance lithium-ion battery anodes, with capacities around 1,400 mA.h/g achieved at a current rate of 1 A/g, and 1,000 mA.h/g achieved at 2 A/g, and stable operation when combined with reduced graphene oxide and tested over up to 200 cycles. We attribute the overall good performance to the combination of porous silicon that can accommodate large volume change during cycling and provide large surface area accessible to electrolyte, and reduced graphene oxide that can serve as an elastic and electrically conductive matrix for the porous silicon nanoparticles.

关键词： porous siliconnanoparticles scalable production lithium-ion battery

Two-dimensional lithiophilic YF_(δ) enabled lithium dendrite removal for quasi-solid-state lithium batteries

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Journal of Materiomics 2021年第2期7卷 355-365页

作者： Xiao Chen Jian Xie yunhao lu Xinbing Zhao Tiejun Zhu State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou310027China Department of Physics Zhejiang UniversityHangzhou310027China

Lithium metal batteries are regarded as promising alternatives to lithium ion batteries due to their high specific ***,lithium dendrite growth during cycling causes safety problem and rapid capacity ***,we report a composite Li anode composed(LYF)of metallic Li and trace amounts(1 e2 wt%)of two-dimensional YF_(δ).The lithiophilic nature of YF_(δ) enables its homogeneous dispersion in metallic *** LYF electrode exhibits lower resistance,higher chemical and mechanical stability,and longer cycle life compared to bare Li electrode due to uniform Li stripping and plating with YF_(δ) incorporation,which was confirmed by in-situ optical microscope observation.X-ray photoelectron spectroscopy reveals that LiF can in-situ form on the LYF electrode with reactions between Li and YF_(δ) during *** spontaneous reactions are clarified by density functional theory calculations.A quasisolid-state cell with LYF anode,LiFePO_(4) cathode and cathode-supported solid electrolyte layer has been constructed with a soft interface constructed between Li anode and solid electrolyte by in-situ thermal *** cell shows a high initial discharge capacity of 147 mAh g1 at 0.5℃ at 60℃ and sustains a stable cycling over 50 cycles with the in-situ formed LiF-rich layer and soft interface.

关键词： Two-dimensional lithiophilic YF_(δ) Lithium anode Quasi-solid-state battery Lithium fluoride Soft interface

Reversible Magnesium Metal Anode Enabled by Cooperative Solvation/Surface Engineering in Carbonate Electrolytes

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Nano-Micro Letters 2021年第12期13卷 109-119页

作者： Caiyun Wang Yao Huang yunhao lu Hongge Pan Ben Bin Xu Wenping Sun Mi Yan Yinzhu Jiang School of Materials Science and Engineering State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027ZhejiangPeople’s Republic of China ZJU‑Hangzhou Global Scientific and Technological Innovation Centre Zhejiang UniversityHangzhou 311200People’s Republic of China Institute of Science and Technology for New Energy Xi’an Technological UniversityXi’an 710021People’s Republic of China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK

Magnesium metal anode holds great potentials toward future high energy and safe rechargeable magnesium battery technology due to its divalent redox and dendrite-free nature. Electrolytes based on Lewis acid chemistry enable the reversible Mg plating/stripping,while they fail to match most cathode materials toward highvoltage magnesium batteries. Herein,reversible Mg plating/stripping is achieved in conventional carbonate electrolytes enabled by the cooperative solvation/surface engineering. Strongly electronegative Cl from the MgCl_(2) additive of electrolyte impairs the Mg…O = C interaction to reduce the Mg^(2+) desolvation barrier for accelerated redox kinetics,while the Mg^(2+)-conducting polymer coating on the Mg surface ensures the facile Mg^(2+) migration and the e ective isolation of electrolytes. As a result,reversible plating and stripping of Mg is demonstrated with a low overpotential of 0.7 V up to 2000 cycles. Moreover,benefitting from the wide electrochemical window of carbonate electrolytes,high-voltage(> 2.0 V) rechargeable magnesium batteries are achieved through assembling the electrode couple of Mg metal anode and Prussian blue-based cathodes. The present work provides a cooperative engineering strategy to promote the application of magnesium anode in carbonate electrolytes toward high energy rechargeable batteries.

关键词： Rechargeable magnesium batteries Metal anode Solvation effect Passivation Carbonate electrolytes

Forging Inspired Processing of Sodium-Fluorinated Graphene Composite as Dendrite-Free Anode for Long-Life Na–CO_(2) Cells

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Energy & Environmental Materials 2022年第2期5卷 572-581页

作者： Yangjun Mao Xiao Chen Hao Cheng yunhao lu Jian Xie Tao Zhang Jian Tu Xiongwen Xu Tiejun Zhu Xinbing Zhao State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Physics Zhejiang UniversityHangzhou 310027China State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China LI-FUN Technology Corporation Limited Zhuzhou 412000China

Na–CO_(2) batteries recently are emerging as promising energy-storage devices due to the abundance of Na in the earth’s crust and the clean utilization of greenhouse gas CO_(2) .However,similar to metallic Li,metallic Na also suffers from a serious issue of dendrite growth upon repeated cycling,while a facile method to solve this issue is still *** this work,we report an effective,environmentally friendly method to inhibit Na dendrite growth by in situ constructing a stable,NaF-rich solid electrolyte interface(SEI)layer on metallic Na via adding a small amount(~3 wt%)of fluorinated graphene(FG)in bulk *** by the forging processing,a uniform Na/FG composite was obtained by melting and repetitive FG-adsorbing/hammering *** Na/FG–Na/FG half cell exhibits a low voltage hysteresis of 110–140 mV over 700 h at a current density up to 5 mA cm^(-2) with an areal capacity as high as 5 mAh cm^(-2).Na–CO_(2) full cell with the Na/FG anode is able to sustain a stable cycling of 391 cycles at a limited capacity of 1000 mAh g^(-1).Long cycle life of the cell can be attributed to the protecting effect of the in situ fabricated NaF-rich SEI layer on metallic *** experiments and density functional theory(DFT)calculations confirm the formation of the NaF-rich SEI *** inhibition effect of the NaF-rich SEI layer for Na dendrites is verified by in situ optical microscopy observations.

关键词： composite anode fluorinated graphene Na dendrite Na-CO_(2)battery NaFrich protecting layer

LATP-coated LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)cathode with compatible interface with ultrathin PVDF-reinforced PEO-LLZTO electrolyte for stable solid-state lithium batteries

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Journal of Materiomics 2024年第3期10卷 682-693页

作者： Xiao Chen Yinda Li yunhao lu Jian Xie Cheng Huang Xiongwen Xu Jian Tu Xinbing Zhao Tiejun Zhu State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310058China Department of Physics Zhejiang UniversityHangzhou310058China LI-FUN Technology Corporation Limited Zhuzhou412000China

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is considered as a promising cathode for high-energy-density solid-sate Li metal battery for its high theoretical ***,the high oxidizability and structural instability during charge limit its practical *** this work,1%(in mass)of nanosized Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)(LATP)was coated on NCM811 to enhance its electrochemical stability with a ceramic/polymer com-posite electrolyte.A robust,ultrathin(11 mm)composite electrolyte film was prepared by combining poly(vinylidene fluoride)(PVDF)with polyethylene oxide(PEO)-Li_(6.5)La_(3)Zr_(1.5)Ta_(0.5)O_(12)(LLZTO).An in-situ polymerization process was used to enhance the interface between the PVDF/PEO-LLZTO(PPL)com-posite electrolyte and the LATP-coated NCM811(LATP-NCM811).Coin-type Li|LATP-NCM811 cell with the PPL electrolyte exhibits stable cycling with an 81%capacity retention after 100 cycles at 0.5 ***-type cell was also fabricated,which can be stably cycled for 70 cycles at 0.5 C/1.0 C(80%retention),and withstand abuse tests of bending,cutting and nail *** work provides an applicable method to fabricate solid-state Li metal batteries with high performance.

关键词： Ultrathin electrolyte film LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) Li_(1.3)Al_(0.3)Ti_(1.7)(PO_(4))_(3)coating In-situ polymerization Li metal battery

Negative magnetoresistance in Weyl semimetals NbAs and NbP： Intrinsic chiral anomaly and extrinsic effects

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Frontiers of physics 2017年第3期12卷 19-28页

作者： Yupeng Li Zhen Wang Pengshan Li Xiaojun Yang Zhixuan Shen Feng Sheng Xiaodong Li yunhao lu Yi Zheng Zhu-An Xu Department of Physics Zhejiang University Hangzhou 310027 China State Key Lab of Silicon Materials Zhejiang University Hangzhou 310027 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Zhejiang California International NanoSystems Institute Zhejiang University Hangzhou 310058 China Collaborative Innovation Centre of Advanced Microstructures Nanjing 210093 China

Chiral anomaly-induced negative magnetoresistance （NMR） has been widely used as critical transport evidence for the existence of Weyl fermions in topological semimetals. In this mini-review, we discuss the general observation of NMR phenomena in non-centrosymmetric NbP and NbAs. We show that NMR can arise from the intrinsic chiral anomaly of Weyl fermions and/or extrinsic effects, such as the superimposition of Hall signals; field-dependent inhomogeneous current flow in the bulk, i.e., current jetting; and weak localization （WL） of coexistent trivial carriers. The WLmcontrolled NMR is heavily dependent on sample quality and is characterized by a pronounced crossover from positive to negative MR growth at elevated temperatures, resulting from the competition between the phase coherence time and the spin-orbital scattering constant of the bulk trivial pockets. Thus, the correlation between the NMR and the chiral anomaly need to be scrutinized without the support of complimentary techniques. Because of the lifting of spin degeneracy, the spin orientations of Weyl fermions are either parallel or antiparallel to the momentum, which is a unique physical property known as helicity. The conservation of helicity provides strong protection for the transport of Weyl fermions, which can only be effectively scattered by magnetic impurities. Chemical doping with magnetic and non-magnetic impurities is thus more convincing than the NMR method for detecting the existence of Weyl fermions.

关键词： Weyl semimetals chiral anomaly negative magnetoresistance extrinsic effects

Strong Coupled Magnetic and Electric Ordering in Monolayer of Metal Thio(seleno)phosphates

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Chinese Physics Letters 2021年第7期38卷 145-150页

作者： Chenqiang Hua Hua Bai Yi Zheng Zhu-An Xu Shengyuan A.Yang yunhao lu Su-Huai Wei Zhejiang Province Key Laboratory of Quantum Technology and Device State Key Laboratory of Silicon MaterialsDepartment of PhysicsZhejiang UniversityHangzhou 310027China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore Beijing Computational Science Research Center Beijing 100193China

The coupling between electric ordering and magnetic ordering in two-dimensional(2D)materials is important for both fundamental research of 2D multiferroics and future development of magnetism-based information storage and ***,we introduce a scheme for realizing a magnetic phase transition through the transition of electric *** take CuMoP_(2)S_(6) monolayer as an example,which is a member of the large 2D transition-metal chalcogen-phosphates *** on first-principles calculations,we find that it is a multiferroic with unprecedented characters,namely,it exhibits two different phases:an antiferroelectric-antiferromagnetic phase and a ferroelectric-ferromagnetic phase,in which the electric and magnetic orderings are strongly ***,the electric polarization is out-of-plane,so the magnetism can be readily switched by using the gate electric *** finding reveals a series of 2D multiferroics with special magnetoelectric coupling,which hold great promise for experimental realization and practical applications.

关键词： ferroelectric coupling transition

Exploration on Key Technologies and Practical Paths for Carbon Emission Reduction in Food System

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Agricultural Biotechnology 2023年第2期12卷 96-104页

作者： Zhenzhong BAI yunhao lu Hongling WANG School of Economics South-Central Minzu UniversityWuhan 430074China Business College Hubei UniversityWuhan 430062China

On the basis of existing research,carbon emission reduction technologies in production,processing,packaging,transportation and storage of the food system were summarized,and their application effects were *** view of the inherent inadequacy of carbon emission reduction technologies in Chinese food system,starting from carbon labeling technologies and ESG system of the food industry,the unsoundness of the carbon emission reduction evaluation system and the high cost of related technology promotion,countermeasures such as strengthening top-level design,encouraging and supporting the development of new carbon emission reduction technologies,and improving carbon emission reduction technology subsidies were proposed by drawing on domestic and international experiences.

关键词： Food system Carbon emission reduction Key technology Practice path