Article
Chemistry, Physical
Kaiyuan Liu, Xianhe Meng, Lijing Yan, Meiqiang Fan, Yechao Wu, Chao Li, Tingli Ma
Summary: The novel Sn/SnOx@NC composite shows high reversible capacity and excellent electrochemical performance as an anode material for lithium-ion batteries, primarily due to its unique porous N-doped carbon frameworks.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Yuluo Chen, Jinpeng Luo, Hang Xu, Xinran Hou, Man Gong, Changshu Yang, HuiCong Liu, Xiuqin Wei, Lang Zhou, Chuanqiang Yin, Xiaomin Li
Summary: Due to its excellent thermal stability, polyimide (PI) is considered a promising alternative for high-safety lithium-ion batteries (LIBs) separators. However, the wettability of PI separators to electrolytes remains undesirable. In this study, a composite membrane with a core-shell structure was developed using the complexation-hydrolyzation method, where gamma-Al2O3 nanoparticles were anchored on PI nanofibers (PI@gamma-Al2O3) as an LIB separator. The results showed that the PI@gamma-Al2O3 nanofiber membrane exhibited improved physicochemical properties and electrochemical performances, including enhanced wettability and higher ionic conductivity. Moreover, the membrane maintained a high capacity retention rate after 100 cycles. Therefore, the core-shell PI@gamma-Al2O3 nanofiber membranes have a promising future for the safety and stability of LIBs.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Yun-Lei Hou, Yu Yang, Wen-Jie Meng, Bu-Yue Lei, Meng-Xin Ren, Xiao-Xiao Yang, Yu-Qian Wang, Dong-Lin Zhao
Summary: The rational surface optimization of copper-coated silicon nanoparticles encapsulated in carbon cages has significantly improved the energy capacity and structure stability in rechargeable batteries. The novel structure exhibits superior reversible capacity and coulombic efficiency, while maintaining high capacity even at high current densities. The synergistic effect of copper and carbon plays a crucial role in enhancing the properties of the composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Daxu Zhang, Gen Chen, Haoji Wang, Long Chen, Ziwei Guo, Zuxin Wen, Ning Zhang, Xiaohe Liu, Renzhi Ma
Summary: The study demonstrates the synthesis of a three-dimensional multicore-shell hollow nanobox encapsulated by a carbon layer, which exhibits high capacity and stability, making it a potential anode material for lithium-ion batteries.
CHINESE CHEMICAL LETTERS
(2022)
Article
Engineering, Mechanical
Xiaofei Wang, Shaofan Li, Qi Tong
Summary: Conventional materials for lithium-based rechargeable batteries are approaching their limit and material failure is a significant barrier. This study develops a concurrently coupled chemo-mechanical model based on peridynamics to investigate the fracture-pattern formation of hollow core-shell structures during lithiation.
EXTREME MECHANICS LETTERS
(2022)
Article
Chemistry, Physical
Lei Jiang, Weihao Yin, Changjian He, Tingting Luo, Yichuan Rui, Bohejin Tang
Summary: Globular Sb2O4 @ PPy core-shell nanospheres were successfully synthesized using a method that combines controllable synthesis of nanospheres and conductive nanocomposite engineering. These nanospheres possess an ultrastable structure, relatively large void space, and shortened diffusion distance, along with a thin conductive PPy shell that can alleviate the significant volume change. As an anode material for lithium-ion batteries, the obtained Sb2O4 @ PPy core-shell nanospheres exhibit enhanced electrochemical performance and high rate capability.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Muhammad Iftikhar, Basit Ali, Talha Nisar, Veit Wagner, Ali Haider, Ata-ur-Rehman, Sajjad Hussain, Ali Bahadar, Muhammad Saleem, Syed Mustansar Abbas
Summary: An innovative approach of using WO3 coating to produce a core-shell structure on SnO2 surface resulted in higher specific capacity and cycling stability. The WO3 shell acted as an effective enhancer for current rate and specific capacity of SnO2 nanoarchitectures, leading to an enhancement in cyclic stability. This study demonstrates the potential application of WO3 as a coating material to improve cyclic characteristics of other metal oxide materials.
Article
Chemistry, Multidisciplinary
Li Zeng, Hongxue Xi, Xingang Liu, Chuhong Zhang
Summary: Silicon/carbon nanofibers with a core-shell structure were successfully fabricated using a coaxial electrospinning technique, exhibiting excellent electrochemical performance, high electrical conductivity, and structural stability, showing great potential for advanced flexible energy storage.
Article
Chemistry, Physical
Zhixuan Huang, Kaifeng Yu, Doudou Wang, Ye Zhang, Lili Li, Ce Liang
Summary: A facile method for fabricating anode nanocomposites with efficient lithium/sodium storage and excellent cycling stability is reported. The nanocomposites consist of iron phytate nanoparticles embedded in TiO2 and N, P-doped Fe2P@TiO2 core-shell carbon nanofibers. The nanocomposites exhibit high energy density, improved electron transport, and cycling stability due to the structural defects induced by the doped carbon fiber and the inhibiting effect of the TiO2 shell. The anode nanocomposites show outstanding electrochemical performance in lithium/sodium-ion batteries.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Zhaoqian Yan, Zhihao Sun, Kaicheng Yue, Anran Li, Hongshou Liu, Zihao Guo, Lei Qian
Summary: By doping with nickel and coating with a carbon shell, a Ni-FeP@C core-shell structure with excellent performance as an anode material for lithium-ion batteries has been designed, improving the electrical conductivity and cyclic stability of FeP materials, thereby enhancing battery performance.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Zeyu Zhang, Shixiong Sun, Wen Zhang, Jia Xu, Xin Wang, Chun Fang, Qing Li, Jiantao Han
Summary: A watermelon-like core-buffer-shell Si/electrochemically exfoliated graphene/C (Si/EG/C) composite was prepared using ball milling and spray drying. The composite exhibited excellent electrochemical performance due to the presence of folds and voids in the graphene layer, which buffered the volume fluctuations of the silicon core and facilitated fast lithium ion transport. It has potential applications in the next generation of Li-ion batteries.
SCIENCE CHINA-MATERIALS
(2022)
Article
Electrochemistry
Xinlong Li, Xinlin Huang, Yuanzhi Chen, Jie Mei, Wanjie Xu, Laisen Wang, Dong-Liang Peng
Summary: The study demonstrated the preparation of monodisperse spinel Li4Ti5O12 (LTO) particles coated with a carbon layer through a solid-phase sintering reaction, which can enhance the rate performances of batteries.
ELECTROCHIMICA ACTA
(2021)
Article
Engineering, Environmental
Shenyu Du, Cong Wu, Liyuan Ao, Xin Zhou, Kai Jiang, Liyan Shang, Yawei Li, Jinzhong Zhang, Zhigao Hu, Junhao Chu
Summary: This study successfully synthesized CoS2@MoS2/CC (CMCC) core-shell nanorods using a two-step hydrothermal method, with the MoS2 layer rich in holes enhancing lithium storage capacity and showing stronger electrochemical performance in LIBs.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Xuefang Chen, Xiaofei Yang, Fengling Pan, Tingting Zhang, Xiayu Zhu, Jingyi Qiu, Meng Li, Yue Mu, Hai Ming
Summary: By studying the fluorine-functionalized core-shell silicon-carbon composite, successful surface modification of silicon-based anode material was achieved, resulting in enhanced reversible capacity and capacity retention in lithium-ion batteries. This research demonstrates a promising prospect for regulating interfacial reactions in silicon-based energy storage systems.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Xue-Qi Lai, Nan Zhang, Xiao Han, Yan-Rong Zhu, Ying Xie, Ting-Feng Yi
Summary: Sea urchin-like LiAlO2@NiCoO2 hybrid composites with core-shell structure assembled with nanoneedles exhibit excellent electrochemical performance, attributed to the large accessible surface area and numerous active sites. The synergy of the sea urchin-like architecture and the ingenious composition design plays a key role in enhancing the specific capacity, cycle performance, and rate capability of the materials.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Chuanxin Hou, Guohua Fan, Xiubo Xie, Xiaoyu Zhang, Xueqin Sun, Yuping Zhang, Bing Wang, Wei Du, Runhua Fan
Summary: This study investigates the electromagnetic properties of TiN/Al2O3 ceramic composites, revealing the impact of TiN content on dielectric and electrical conductivity, as well as the role of interface polarization and electron plasmonic state in the formation of negative permittivity. The findings highlight the potential of TiN/Al2O3 binary ceramics as negative permittivity metacomposites, enriching the understanding of electromagnetic behaviors in ceramic materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
X. T. Song, Guangyue Shi, Guohua Fan, Yao Liu, Runhua Fan
Summary: Percolative graphite/barium titanate (GR/BaTiO3) composite prepared using hotpressing sintered process exhibits negative permittivity behaviors when the graphene content exceeds 2 wt%, along with metallic-like behavior in AC conductivity. Equivalent circuit analysis reveals the relationship between capacitive-inductive transition and the change of permittivity from positive to negative.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Wanli Yuan, Kai Sun, Jiahong Tian, Yaping Li, Zongxiang Wang, Boyang Liu, Runhua Fan
Summary: This study introduces a double shells structure for iron-based soft magnetic composites, which enhances the magnetic properties and high-temperature resistance of the material, resulting in lower core loss.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Yuanhui Liu, Chuanbing Cheng, Wenjun Sun, Zemeng Zhang, Rongwei Ma, Jingxu Zhou, Jia Wang, Tailin Wang, Qiuju Zheng, Yi Du, Jianxing Shen, Runhua Fan
Summary: This paper prepared ceramic composites with carbon fibers homogeneously dispersed in an alumina matrix using hot press sintering process, investigated the impact of carbon fiber content on the microscopic morphology, electrical conductivity, and negative permittivity behavior, and found that both conductivity and negative permittivity increased with increasing carbon fiber content.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Manufacturing
Licheng Ju, Zongxiang Wang, Kai Sun, Huaxin Peng, Runhua Fan, Faxiang Qin
Summary: In this study, a percolation network of silver nanowires was constructed in a polyimide matrix, resulting in a transformation of permittivity from positive to negative when the amount of nanowires exceeded the percolation threshold. By controlling the content of silver nanowires, a metacomposite with a weak negative permittivity of -16 and low dielectric loss was successfully prepared, featuring an ultralow percolating concentration.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Composites
Yunpeng Qu, Zhongyang Wang, Peitao Xie, Zongxiang Wang, Runhua Fan
Summary: Metacomposites have recently been a focus of attention due to their potential in electronic and dielectric devices, but they have faced challenges with extremely high negative permittivity. This study introduces a novel strategy to suppress plasma oscillation in Metacomposites and control the value of negative permittivity by incorporating semiconductive polyaniline into PANI/Ni metacomposites. The resulting materials exhibit weakly negative permittivity with fine-tuning capabilities, offering promising applications in electromagnetic shielding, microwave absorption, and novel electromagnetic sensors.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Licheng Ju, Qifa He, Faxiang Qin, Huaxin Peng, Runhua Fan
Summary: This study finds that the positive and negative real permittivity can be effectively modulated using low-cost copper microwire epoxy composites, which is of great significance in applications.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Kelan Yan, Liming Shen, Feng Yin, Guicun Qi, Xiaohong Zhang, Runhua Fan, Ningzhong Bao
Summary: This paper introduces a facile method for synthesizing La0.5Sr0.5MnO3 with negative properties, which can achieve negative permittivity and permeability simultaneously within a certain frequency range. By adjusting factors such as electron concentration, lattice symmetry, and magnetic resonance, the performance of this material can be controlled.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Ziyu Zhang, Yehao Zhao, Zihao Li, Lujie Zhang, Zixuan Liu, Zhenkun Long, Yunjia Li, Yao Liu, Runhua Fan, Kai Sun, Zidong Zhang
Summary: This study investigates the absorbing mechanism of carbon-based nanofibers and synthesizes composite nanofibers with Co-Fe nanoparticles and SiO2, showing excellent microwave absorption performance. The optimized nanofibers provide effective ideas for high-performance microwave absorption materials synthesis.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Materials Science, Ceramics
Kai Sun, Pengtao Yang, Qifa He, Runhua Fan, Zongxiang Wang, Jiahong Tian, Xuechun Yang, Wenxin Duan, Xinfeng Wu, Zhongyang Wang
Summary: In this study, La1-xSrxMnO3 (LSMO) ceramic was successfully fabricated and both Lorentz-like and Drude-like negative permittivity were observed by adjusting the content of Sr2+. With the increase of Sr2+ content, the amplitude of dielectric resonance decreased and the resonance frequency shifted to a lower frequency region. When the Sr2+ content reached 0.7, the Drude-like negative permittivity dominated. The low tand value of LSMO was also observed. The generation and regulation mechanism of negative permittivity were clarified.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Manufacturing
Kai Sun, Wenxin Duan, Yanhua Lei, Zongxiang Wang, Jiahong Tian, Pengtao Yang, Qifa He, Min Chen, Haikun Wu, Zheng Zhang, Runhua Fan
Summary: Flexible composites with weakly negative permittivity were prepared by using polyvinylidene fluoride (PVDF) as the flexible matrix and modified multi-walled carbon nanotubes (MWCNTs) as functional fillers. The composites exhibited low frequency dispersion behavior with a negative permittivity conforming to Drude model when the content of MWCNTs exceeded 13wt%. This study provides guidance for the development and application of flexible metamaterials.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Chuanbing Cheng, Yuanhui Liu, Rongwei Ma, Runhua Fan
Summary: The recent advancement of metacomposites with negative permittivity provides a new research approach for the design and construction of electromagnetic shielding materials. In this study, Ni/YIG metacomposites were fabricated using a liquid impregnation approach and their electromagnetic properties were explored at MHz and Ku bands. With an increase in Ni content, isolated Ni particles formed interconnected networks in the composites, resulting in changes in conducting mechanism and reactance characteristic. The composites with high Ni contents exhibited a negative permittivity behavior, attributed to low-frequency plasma state of free electrons in the completed Ni networks. The dispersion of negative permittivity at frequencies below 10 MHz was influenced by isolated metal particles and could be well described by the Drude-Lorentz model. A notable shielding effectiveness of 33.1 dB was achieved at Ku band, primarily due to the impedance mismatch caused by the negative permittivity. The inductive conducting networks were crucial building blocks for achieving negative permittivity and improving electromagnetic shielding performance. This work provides guidance for designing electromagnetic shielding metacomposites and promotes further development in this field.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Zaixin Wei, Zhongyang Wang, Ciqun Xu, Guohua Fan, Xiaoting Song, Yao Liu, Runhua Fan
Summary: This study achieved temperature-stable negative permittivity in the kHz region by preparing specific ceramic materials and elaborated on the underlying mechanisms. The zero-crossing behavior of the real permittivity observed in the sample provides a promising alternative for designing epsilon-near-zero materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Shuimiao Xia, Zhicheng Shi, Liang Sun, Shengbiao Sun, Davoud Dastan, Runhua Fan
Summary: A layered structure is designed to effectively suppress the loss and enhance the breakdown strength of high dielectric materials.
Article
Nanoscience & Nanotechnology
Zhipeng Wang, Kuan Yin, Yuliang Zhang, Kai Sun, Longjie Xie, Mengyang Cong, Shengjia Cao, Yanhua Lei, Xiaofeng Li, Runhua Fan
Summary: In this paper, Ti3C2Tx/carbonized wood composites with weakly negative permittivity were successfully prepared. The composites demonstrated the formation of three-dimensional conductive networks and a change in permittivity values from positive to negative, indicating a unique phenomenon and potential applications.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
