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Study of lithium storage properties of the Sn-Ni alloys prepared by magnetic sputtering technology

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Acta Metallurgica Sinica(English Letters) 2010年第5期23卷 363-369页

作者： xianhua hou Shejun HU Wei PENG Zhiwen ZHANG Qiang RU School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510006 China

Nano-level Sn-Ni alloy thin-film electrode materials prepared by magnetic sputtering technology are characterized with X-ray diffraction （XRD）, atom force microscopy （AFM） and scanning electron microscopy （SEM）. The charge/discharge and cyclic voltammograms （CV） of the films electrodes are tested by the battery testing system of high precision. The results indicate that the materials prepared by direct current （DC） and radio frequency （RF） methods differ greatly in their performance. Ni3Sn2 alloy phase constitutes the main components prepared by DC method, the particles on the surface are tiny and show steady cycling performance, the deficiency is that they have low initial efficiency and small discharge capacity of 72% and 108 mA·h/g, respectively. Contrary to the former, Ni3Sn4 alloy phase constitutes the main com- ponents prepared by RF method, the particles on the surface appear comparatively larger, their discharge capacity did not decline in the first 15 times, keeping above 500 mA·h/g, but began to decline after 15 times.

关键词： Lithium ion battery Sn-Ni alloy Electrochemical property

Unexpected elastic isotropy in a black phosphorene/TiC2 van der Waals heterostructure with flexible Li-ion battery anode applications

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Nano Research 2017年第9期10卷 3136-3150页

作者： Qiong Peng Kangming Hu Baisheng Sa Jian Zhou Bo Wu xianhua hou Zhimei Sun Multiscale Computational Materials Facility College of Materials Science and Engineering Euzhou University Fuzhou 3S0100 China Key Laboratory of Eco-Materials Advanced Technology (Fuzhou University) Fujian Province University Fuzhou 350 I00 China School of Materials Science and Engineering and Center for Integrated Computational Materials Engineering International Research Institute for Multidisciplinary Science Beihang University Beijing 100191 China Guangdong Engineering Technology Research Center of Efficient Green Energy and Environmental Protection Materials School ofPhysics and Telecommunication Engineering South China Normal University Guangzhou 510006 China

Recently, flexible electrodes with biaxial/omnidirectional stretchability have attracted significant attention. However, most existing pliable electrode materials can be only stretched in one direction. In this work, an unexpected isotropic van der Waals (vdW) heterostructure is proposed, based on the assembly of two-dimensional crystals of anisotropic black phosphorene (BP) and transition metal carbide (TiC2). Using vdW-corrected density functional theory calculations, the BP/TiC2 vdW heterostructure was predicted to have excellent structural and mechanical stability, superior electrical conductivity, omnidirectional flexibility, and a high Li storage capacity. We have unraveled the physical origin of the excellent stability, as well as the Li adsorption preferences of the lithiated heterostructure, based on a three-step analysis of the stability of the Li-adsorption processes. In addition, the BP/TiC2 vdW heterostructure can also be applied as the anode material for flexible Na-ion batteries because of its high Na storage capacity and strong Na binding. However, compared with Na adsorption, the capacity is higher, and the adsorption energy is more negative for Li adsorption. Our findings provide valuable insights into the exploration of a rich variety of vdW heterostructures for next-generation flexible energy storage devices.

关键词： van der Waals heterostructure omnidirectional stretchability Li adsorption flexible anode first-principles calculations

Hierarchically 3D structured milled lamellar MoS2/nano-silicon@carbon hybrid with medium capacity and long cycling sustainability as anodes for lithium-ion batteries

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Journal of Materials Science & Technology 2019年第9期35卷 1840-1850页

作者： Peng Zhang Qiang Rua Honglin Yan xianhua hou Fuming Chen Shejun Hu Lingzhi Zhao Guangdong Engineering Technology Research Center o f Efficient Green Energy and Environmental Protection Materials South China Normal University Guangzhou 510006China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006China Engineering Research Center of Materials and Technology for Electrochemical Energy Storage (Ministry of Education) Guangzhou 510006China Institute of Optoelectronic Materials and Technology South China Normal UniversityGuangzhou 510631China

A hierarchically 3D structured milled lamellar MoS2/nano-siIicon@carbon hybrid with medium capacity and long-term lifespan is designed by a green and scalable approach using ball milling process and spraydrying/ pyrolysis routes. The microspheres consist of low-content nano-silicon (20 wt%), milled lamellar M0S2 sheets and porous carbon skeletons. A mixture of silicon nanoparticles and M0S2 flakes serves as an inner core, while porous carbon pyrolyzed from petroleum pitch acts as a protective shell. The particular architecture affords robust mechanical support, abundant buffering space and enhanced electrical conductivity, thus effectively accommodating drastic volume variation during repetitive Li+ intercalation/ extraction. The Si/MoS2@C hybrid delivers a high initial discharge specific capacity of 1257.8 mA hg^-1 and exhibits a reversible capacity of 767.52 m A hg^-1 at a current density 100 mA g'1 after 250 cycles. Most impressively, the electrode depicts a superior long-cycling durability with a discharge capacity of 537.6 mA hg^-1 even after 1200 cycles at a current density of 500 m A g^-1. Meanwhile, the hybrid also shows excellent rate performance such as 388.1 mA h g^-1 even at a large current density of 3000 mA g^-1.

关键词： Si MoS2 Medium capacity Long-term lifespan Lithium ion batteries

Influence of structure and atom sites on Sn-based anode materials for lithium ion batteries: a first-principle study

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Chinese Science Bulletin 2014年第13期59卷 1459-1467页

作者： Zhaowen Huang Shejun Hu xianhua hou Qiang Ru Lingzhi Zhao Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecommunication Engineering South China Normal University Engineering Research Center of Materials and Technology for Electrochemical Energy Storage Ministry of Education Laboratory of Nanophotonic Functional Materials and Devices Institute of Opto-Electronic Materials and Technology South China Normal University

To understand the influence of structure and atom sites on the electrochemical properties of Sn-based anode materials,the lithium intercalation–deintercalation mechanisms into SnNi2Cu and SnNiCu2phases were studied using the first-principle plane wave pseudo-potential *** results showed that both SnNi2Cu and SnNiCu2were unsuitable anode materials for lithium ion *** Sn-based anode structure related to the number of interstitial sites,theoretical specific capacity,and volume expansion *** atom sites led to different forces at interstitial sites,resulting in variations in formation energy,density of states,and hybrid orbital *** order to validate the calculated model,the SnNi2Cu alloy anode material was synthesized through a chemical reduction-codeposition *** results proved that the theoretical design was ***,when selecting Snbased alloy anodes,attention should be paid to maximizing the number of interstitial sites and distributing atoms reasonably to minimize forces at these sites and facilitate the intercalation and deintercalation of lithium ion.

关键词：锡基负极材料锂离子电池解结构原子第一原理网站 Sn 计算结果

An Insight on Future Development Approaches of Salt Lake Magnesium Resources:from the Current Situation of China's Magnesium Industry

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 335-336页

作者： hou xianhua ZHENG Mianping Mineral resource institute Chinese Academy of Geological Sciences Key laboratory of salt lake resource and environmentMinistry of Land and Resources

Magnesium-bearing minerals discovered on the earth so far occur mainly as solid or *** former include magnesite(Mg CO3),dolomite(Mg CO3·Ca CO3),carnallite(Mg Cl2·KCl·6H2O),bischofite(Mg Cl2·6H2O)and

关键词： magnesium metal,magnesium industry,magnesium resources,salt lake the Qaidam Basin

Facile hydrothermal and sol-gel synthesis of novel Sn-Co/C composite as superior anodes for Li-ion batteries

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Chinese Science Bulletin 2014年第23期59卷 2875-2881页

作者： Xiaoli Zou xianhua hou Zhibo Cheng Yanling Huang Min Yue Shejun Hu Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecommunication EngineeringSouth China Normal University Engineering Research Center of Materials and Technology for Electrochemical Energy Storage (Ministry of Education) BTR New Energy Materials Co.LTD

As an anode material in lithium ion battery,the Sn-Co/C composite electrode materials have been successfully synthesized by hydrothermal and sol-gel methods,*** resultant composites were mainly composed of Sn-based oxides,nanometer Sn-Co alloy and *** and Co,acting as buffer materials,can accommodate to the large volume change of active Sn during the discharge-charge process,thus improving the cycling *** charge/discharge curves revealed the excellent cycle performance for samples synthesized by both methods,composites obtained by the sol-gel showed a better dispersion effect of nanoparticles on the carbon matrix and possessed much more improved stable capacity with*624.9 mAh g-1over 100 cycles and that by hydrothermal method only exhibited*299.3 mAh ***,the Sn-Co/C composites obtained by sol-gel synthesis method could be a perfect candidate for anode material of Li-ion storage battery.

关键词：复合材料锂离子电池合成样品阳极材料凝胶法水热法溶胶循环稳定性

First-principle study on NiSn_(0.5)Ti_(0.5) phase as electrode materials for lithium ion battery

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Chinese Science Bulletin 2010年第27期55卷 3113-3117页

作者： RU Qiang HU SheJun ZHANG ZhiWen PENG Wei hou xianhua HUANG ZhaoWen Laboratory of Quantum Information Technology School of Physics and Telecommunication Engineering South China Normal University Guangzhu 510006 China Department of Mathematics and Physics Wuyi University Jiangmen 529020 China

The electronic structure and electrochemical parameters of ternary NiSn0.5Ti0.5 phase are investigated by plane-wave pseudopotential method of the *** interstitial sites are firstly filled with lithium atoms,and then the substitution for Ni sites *** results show that the Fermi level of lithium-intercalated phase goes up with the increasing lithium *** interactions of M-M covalent bonds (M=Ni,Sn,Ti) become weak,while Li-M bonds are found to *** 0.5Ti0.5 phase is characterized with high theoretical capacity and low voltage of *** obvious volume effect from 77.15%to 189.94% would lead to the failure of the electrode material,and therefore the NiSn0.5Ti0.5 compound should be limited as low as possible in multi-element Sn-based alloy.

关键词：锂离子电池电极材料一阶锡基合金电化学参数第一性原理 TiAl基电子结构

Assessment of Groundwater Source of Piedmont Plain Area of China Northwest Arid Region Based On Numerical Modeling

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 419-420页

作者： hou xianhua ZHANG Jiahao LIU Jilai Mineral resource institute Chinese Academy of Geological SciencesKey laboratory of salt lake resource and environmentMinistry of Land and Resources Qinghai Qaidam Comprehensive Geology & Mine Prospecting Institute China University of Mining & Technology (Beijing)

After the middle of 1960s,along with the appearance and extensive utilization of computer featured in large capacity and rapid speed,numerical method(mainly include finite difference method and finite element

关键词： groundwater source numerical simulation piedmont plain area Xiangride-Ruomuhong Qaidam Basin

Dead lithium phase investigation of Sn-Zn alloy as anode materials for lithium ion battery

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Chinese Science Bulletin 2009年第6期54卷 1003-1008页

作者： HUANG ZhaoWen HU SheJun hou xianhua RU Qiang YU HongWen ZHAO LingZhi LI WeiShan School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510006 China Department of Mathematics and Physics Wuyi University Jiangmen 529020 China Key Lab of Electrochemical Technology on Energy Storage and-Power Generation in Guangdong Universities Guangzhou 510006 China

In this work, based on First-principle plane wave pseudo-potential method, we have carried out an in-depth study on the possible dead lithium phase of Sn-Zn alloy as anode materials for lithium ion batteries. Through investigation, we found that the phases LixSn4Zn4(x = 2, 4, 6, 8) contributed to re-versible capacity, while the phases LixSn4Zn8-(x-4)(x = 4.74, 7.72) led to capacity loss due to high forma-tion energy, namely, they were the dead lithium phases during the charge/discharge process. And we come up with a new idea that stable lithium alloy phase with high lithiation formation energy (dead lithium phase) can also result in high loss of active lithium ion, besides the traditional expression that the formation of solid electrolyte interface film leads to high capacity loss.

关键词：锂离子电池负极材料锂合金死亡 Sn Zn 固体电解质界面膜容量损失