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Synthesis ofα-Li FeO_(2)/Graphene nanocomposite via layer by layer self-assembly strategy for lithium-ion batteries with excellent electrochemical performance

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Journal of materials Science & Technology 2020年第20期52卷 173-181页

作者： Youzuo Hu Hongyuan Zhao Ming Tan Jintao Liu Xiaohui Shu Meiling Zhang Shanshan Liu Qiwen Ran Hao Li Xingquan Liu R&D Center for New energy materials and Integrated energy devices University of Electronic Science and Technology of ChinaChengdu 610054China

As a potential alternative cathode material,α-LiFeO2 suffers a realization handicap,mainly due to its poor electrical conductivity and low lithium ion diffusion *** this work,we have successfully synthesized α-LiFeO2/rGO nanocomposite through a layer by layer self-assembly modification process and annealing *** to the strong electrostatic attraction between opposite cha rged spices,α-LiFeO2 nanoparticles were homogeneously dispersed on the graphene sheet to form a typical interconnected conducting network which was bene ficial for electronic conductivity and ionic diffu *** comparison to pristine α-LiFeO2,the α-LiFeO2/rGO displayed an excellent electrochemical perfo rmance with average discharge capacities of 238.9,187.2,178.4,121.8 and 99.5 mA hg^-1 at 0.1,0.2,0.5,1 and 2 C,***,the specific capacity retained 164.9 mA h g^-1 and 107.98 mA h g^-1 after 50 cycles at 0.5 C and 1 C,*** remarkable progress in rate capability and cycling ability of this new nanocomposite developed a new approach to improve the electrochemical performance of α-LiFeO2.

关键词： α-LiFeO_(2) Lithium ion battery Graphene Layer by layer self-assembly

Sulfolane‑Based Flame‑Retardant Electrolyte for High‑Voltage Sodium‑Ion Batteries

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Nano-Micro Letters 2025年第2期17卷 498-516页

作者： Xuanlong He Jie Peng Qingyun Lin Meng Li Weibin Chen Pei Liu Tao Huang Zhencheng Huang Yuying Liu Jiaojiao Deng Shenghua Ye Xuming Yang Xiangzhong Ren Xiaoping Ouyang Jianhong Liu Biwei Xiao Jiangtao Hu Qianling Zhang Graphene Composite Research Center College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Center of Electron Microscopy State Key Laboratory of Silicon and Advanced Semiconductor MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China GRINM(Guangdong)Research Institute for Advanced materials and Technology FoshanGuangdong 528051People’s Republic of China College of energy Engineering Zhejiang UniversityHangzhouZhejiang 310027People’s Republic of China School of materials Science and Engineering Xiangtan UniversityXiangtan 411105People’s Republic of China Shenzhen Eigen-Equation Graphene Technology Co.Ltd Shenzhen 518000People’s Republic of China

Sodium-ion batteries hold great promise as next-generation energy storage ***,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of *** particular,an unstable cathode–electrolyte interphase(CEI)leads to successive electrolyte side reactions,transition metal leaching and rapid capacity decay,which tends to be exacerbated under high-voltage ***,constructing dense and stable CEIs are crucial for high-performance *** work reports localized high-concentration electrolyte by incorporating a highly oxidation-resistant sulfolane solvent with non-solvent diluent 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether,which exhibited excellent oxidative stability and was able to form thin,dense and homogeneous *** excellent CEI enabled the O3-type layered oxide cathode NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)to achieve stable cycling,with a capacity retention of 79.48%after 300 cycles at 1 C and 81.15%after 400 cycles at 2 C with a high charging voltage of 4.2 *** addition,its nonflammable nature enhances the safety of *** work provides a viable pathway for the application of sulfolane-based electrolytes on SIBs and the design of next-generation high-voltage electrolytes.

关键词： Sodium-ion batteries Sulfolane-based electrolyte High voltage Layered oxide cathode Flame retardant

A simple method to synthesize worm-like AlN nanowires and its field emission studies

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Chinese Physics B 2021年第8期30卷 469-474页

作者： Qi Liang Meng-Qi Yang Chang-Hao Wang Ru-Zhi Wang Institute of New energy materials and devices of Faculty of materials and Manufacturing Key Laboratory of Advanced Functional Materials of Education Ministry of ChinaBeijing University of TechnologyBeijing 100124China

The worm-like AlN nanowires are fabricated by the plasma-enhanced chemical vapor deposition(PECVD)on Si substrates through using Al powder and N2 as precursors,CaF2 as fluxing medium,Au as catalyst,*** as-grown worm-like AlN nanowires each have a polycrystalline and hexagonal wurtzite *** diameters are about 300 nm,and the lengths are over 10μ*** growth mechanism of worm-like AlN nanowires is *** plasma plays a very important role in forming the polycrystalline structure and rough surfaces of worm-like AlN *** worm-like AlN nanowires exhibit an excellent field-emission(FE)property with a low turn-on field of 4.5 V/μm at a current density of 0.01 mA/cm^(2) and low threshold field of 9.9 V/μm at 1 mA/cm^(2).The emission current densities of worm-like AlN nanowires each have a good *** enhanced FE properties of worm-like AlN nanowires may be due to their polycrystalline and rough structure with nanosize and high aspect *** excellent FE properties of worm-like AlN nanowires can be explained by a grain boundary conduction *** results demonstrate that the worm-like AlN nanowires prepared by the proposed simple and the PECVD method possesses the potential applications in photoelectric and field-emission devices.

关键词： worm-like aluminum nitride nanowires growth mechanism plasma enhanced chemical vapor deposition field-emission property

Influence of Sc Addition on Precipitation Behavior and Properties of Al-Cu-Mg Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 948-960页

作者： Xiangbin Han Shuangbao Wang Bo Wei Shuai Pan Guizhen Liao Weizhou Li Yuezhou Wei School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Key laboratory of LCR materials and devices of Yunnan Province National Center for International Research On Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China

In this study, the Al-5.10Cu-0.65 Mg alloys without and with 0.2 wt% Sc addition were prepared to unveil the effect of Sc on the precipitate behavior and properties by atomic-scale scanning transmission electron microscopy. The results show that addition of Sc is able to significantly suppress the formation of the peak-hardening θ’ and S precipitates but in favor of stabilizing Guinier–Preston–Bagaryatsky(GPB) zones during isothermal aging at 180 ℃. The generation of unique GPB precursors dictating the evolution of the subsequent peak-hardening GPB zones is highly correlated with the insufficient vacancies and dragging effect of Sc to Cu in the Al-Cu-Mg-Sc alloy, thereby restricting the nucleation of θ′ and S precipitates owing to the decreased available Cu solutes. In property, 0.2 wt% Sc addition can not only enhance the corrosion resistance but also the electrical conductivity of the peak-hardening alloy. In addition, the peak-hardening Al-Cu-Mg-Sc alloy is also featured with increased strength without losing the ductility compared to its solid solution state. Further analyses indicate that the improved properties are essentially attributed to the formation of densely distributed strain-free GPB zones and smaller precipitate-free zones. The obtained results could provide a potential design strategy of high-performance alloys by Sc addition.

关键词： Al alloy Micro-alloying Precipitation Atomistic mechanism Transmission electron microscopy

Micro-strain regulation strategy to stabilize perovskite lattice based on the categories and impact of strain on perovskite solar cells

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Journal of energy Chemistry 2025年第1期100卷 578-604页

作者： Caixia Li Wenwu Liu Shiji Da Lingbin Kong Fen Ran State Key laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology School of materials Science and Engineering Lanzhou University of Technology

Photovoltaic metal halide perovskite solar cells(PSCs) convert light to electricity more efficiently than crystalline silicon cells, and the cost of materials used to make them is lower than that of silicon *** efficiency is not a core issue affecting the application of perovskite solar cells in special *** present, stability is the major technical encounters that hinders its further commercial development. Microstrain in PSCs is currently a significant factor responsible for the device's instability. Strain-induced ion migration is widely believed to accelerate perovskite degradation even when external stimuli are ***, it is imperative to study strain to enhance the stability of PSCs. This paper reviews recent developments to understand strain's origin and effect mechanisms on performance of PSCs, including ion migration,failure behavior, defect formation, and its effect on photoelectric properties, stability, and ***, several well-known strain management strategies are systematically introduced based on the strain effect mechanism and strain engineering on the film, providing more clues for further preparation with increased stability. The manipulation of external physical strain applied from films to entire devices has been extensively studied. Furthermore, recommendations for future research directions and chemical approaches have been provided. It is emphasized that strain engineering plays a crucial role in improving the efficiency and longevity of PSCs. Tensile strain causes rapid degradation, while moderate compressive strain and external strain control could improve properties and stability. Efforts should focus on controlling compressive strain to mitigate residual tensile strain and introducing it in a controlled manner. Future research endeavors may focus on exploring these pathways to improve the efficiency and lifespan of PSCs.

关键词： Halide perovskite solar cells Strain origins Strain effects Strain management

Guest-assisted assembly strategy:boosting solvent-processed organic solar cells toward commercialization

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Science China Chemistry 2022年第4期65卷 645-646页

作者： Yong Cao State Key laboratory of Luminescent materials and devices Institute of Polymer Optoelectronic Materials and DevicesInstitute of Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

In recent years, due to the increasing demand for green energy, organic/polymer heterojunction solar cells have aroused great interest in the academic and industrial ***/polymer solar cells (OSCs) have a series of advantages over their counterparts. The morphology of the active layer and the energy band structure of the device can be adjusted easily by changing the molecular ***-area low-cost modules can be prepared by roll-to-roll solution printing at room temperature.

关键词： temperature structure polymer

Effects of thin MnAl buffer layer on structural and magnetic properties of MnAl films

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Chinese Physics B 2010年第10期19卷 550-553页

作者：张旭辉马斌张宗芝金庆原 Key lab of Advanced Photonic materials and devices Laboratory of Advanced Materials and Department of Optical Science and Engineering Fudan University

Thin Mn（2 nm）/Al（2 nm） bilayers serving as buffer layers have been prepared prior to the deposition of MnAl films. The ferromagnetic T-phase forms in the buffer layers at an optimum substrate temperature. As a template it induces the growth of following MnAl film. Compared with the case of film without buffer layer, the growth of nonferromagnetic phase is suppressed and the structural and magnetic properties of MnAl film are improved. Weak dipolar inter-grain coupling is revealed in the MnAl film, and the magnetic reversal process is dominated by magnetic moment rotation.

关键词： Ll0 τ--MnAl buffer layer

Blue light-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide unit in alkyl side chain

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Science China Chemistry 2017年第10期60卷 1356-1366页

作者： Yiwen Fang Jie Liu Yuhao Zhang Ting Guo Fei Huang Wei Yang Yong Cao Institute of Polymer Optoelectronic materials and devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China

Blue light-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide(SO) unit in alkyl side chain(PF-FSOs and PF-CzSOs) were synthesized. All the polymers show high thermal stability with the decomposition temperatures over400 °C. The highest occupied molecular orbital(HOMO) and the lowest unoccupied molecular orbital(LUMO) energy levels of the copolymer slightly decrease with the increase of SO content in side chain. PL spectra of the polymers show slightly red shift and broadening with the increase of solvent polarities, indicating unremarkable intramolecular charge transfer(ICT) effect in the polymers containing SO unit in alkyl side chain. EL spectra of the polymers are almost unchanged in the current densities from 100 to 400 mA cm.2, indicating the superb EL stability of the resulted polymers. The EL spectra of the copolymers exhibit obvious blue-shift and narrowing with the CIE of(0.18, 0.11) for PF-FSO10 and(0.17, 0.11) for PF-CzSO10, respectively,compared with PF-SO10 containing SO unit in main chain with the CIE of(0.16, 0.17) and PFO with the CIE of(0.18, 0.18).The superior device performances were obtained with the luminous efficiency(LEmax) of 1.17 and 0.68 cd A.1 for PF-FSO15 and PF-CzSO20, respectively, compared with the LEmax of 0.37 cd A.1 for PFO. The results indicate that linking SO unit to alkyl side chain of the polyfluorene is a promising strategy for efficient blue light-emitting polymers.

关键词： dibenzothiophene-S S-dioxide alkyl side chain polyfluorene blue emission polymer light-emitting diode(PLED)

Spin gapless armchair graphene nanoribbons under magnetic field and uniaxial strain

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Chinese Physics B 2013年第8期22卷 596-600页

作者：侯海平谢月娥陈元平欧阳滔葛青霞钟建新 Hunan Key laboratory for Micro-Nano energy materials and devices Xiangtan University laboratory for Quantum Engineering and Micro-Nano energy Technology and Faculty of materials and Optoelectronic Physics Xiangtan University

Using Green＇s function method, we investigate the spin transport properties of armchair graphene nanoribbons （AG- NRs） under magnetic field and uniaxial strain. Our results show that it is very difficult to transform narrow AGNRs directly from semiconductor to spin gapless semiconductors （SGS） by applying magnetic fields. However, as a uniaxial strain is exerted on the nanoribbons, the AGNRs can transform to SGS by a small magnetic field. The combination mode be- tween magnetic field and uniaxial strain displays a nonmonotonic arch-pattern relationship. In addition, we find that the combination mode is associated with the widths of nanoribbons, which exhibits group behaviors.

关键词： graphene spin gapless spin transport tight-binding