DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 43
·15433-15442
·
IF 4.174
Yini Mao,Zhiyi Wang,Rui Ye,Li Jiang,Shanshan Hu,Jun Yang
Octahedral [CaY]F2 crystals with an average particle size of 1 μm were synthesized via a mild one-step hydrothermal route without employing any surfactants. Various morphologies, including cubes, truncated cubes, truncated octahedrons, and spheres, were achieved via manipulating the amount of EDTA used, and a possible growth mechanism was proposed based on the surface energies of different crystal planes and the influence of the surfactant. XRD, SEM, EDS, TEM, HRTEM, and PL analysis were used to characterize the products. The effects of the morphologies and Li+ doping concentrations on the luminescence intensities of the [CaY]F2:Ce3+/Tb3+ phosphors were explored, and the strongest luminescence intensity is obtained when the sample is cubic with (100) crystal faces and the doping concentration of Li+ is 0.25 mol%. Additionally, multicolor emission (blue → aquamarine blue → green) was obtained from [CaY]F2:Ce3+/Tb3+ phosphors via adjusting the doping concentration of Tb3+, which resulted from the Ce3+ → Tb3+ energy transfer behavior; the energy transfer here happened through a dipole–dipole mechanism. This work may result in the as-synthesized phosphors having great application potential in many optoelectronic device fields, such as in displays and multicolor lighting.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shouji Huang,Liwen Yang,Guobao Xu,Tongye Wei,Jiao Tian,Xiong Liu,Huapeng Li,Ziyuan Xiang,Juexian Cao,Xiaolin Wei
A template-free strategy is developed to construct a composite of hollow Co 3 O 4 nanocrystals with N-doped carbon and carbon nanotubes (CNTs) as freestanding anodes for Li and Na ion batteries (LIBs/NIBs) via a chemical precipitation and subsequent two-step annealing. In this composite, the N-doped carbon coated hollow Co 3 O 4 nanocrystals have a average diameter of 12 nm and are anchored tightly on highly conductive CNT substrates. Such nanocomposite possesses large specific surface area to supply ample active sites, highly conductive carbon networks to enhance electric conductivity, short ion diffusion distance to improve ion transport, and large interior space to accommodate volume expansion during repeatedly electrochemical reaction. Furthermore, kinetic analysis reveal that pseudocapacitive-controlled Li/Na storages plays a vital role. The freestanding composite as a anode for the LIBs exhibits large reversible capacity (1468 mAh g −1 after 130 cycles at 0.2 A g −1 ), superior rate performance (271 mAh g −1 at 12.5 A g −1 ) and good cyclic stability (905 mAh g −1 after 350 cycles at 1.0 A g −1 ). For the NIBs, the freestanding composite delivers attractive rate performance (104 mAh g −1 at 10 A g −1 ) and long cyclic performance (189 mAh g −1 after 400 cycles at 2.0 A g −1 ). Moreover, the assembled Li/Na full cell using the freestanding composite as anodes and LiFePO 4 (for LIBs) and Na 3 V 2 (PO 4 ) 3 (For NIBs) as the cathodes display superior electrochemical performances. Our results suggest the prepared freestanding composite has a highly promising application in high-performance LIBs/NIBs.
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Advanced Materials Interfaces
·
2020
·Vol. 8
·期 3
·2001588
·
IF 4.948
Canhuang Li,Siyong Wu,Yijing Qiu,Dongsheng Lu
As the most promising cathode material in new energy resources, LiNi 0.5 Mn 1.5 O 4 (LNMO) are widely researched due to its high platform, low cost, and environment-friendliness, when they are assembled with graphite into battery which can lead to a faster capacity decay because of unstable solid–liquid interface. This work is devoted to stabilize electrolyte and protect interface of LNMO/graphite full battery by adding multifunctional additive, tributyl phosphate (TBP). Theory calculation which exhibits disconnection of TBP can participate in the reaction to form a uniform and dense cathode electrolyte interface film (8–10 nm) and solid electrolyte interface film around 15 nm on both electrodes, more importantly, the existence of phosphoric acid functional group can hinder the attack of hydrofluoric acid and protect electrode film. Besides, comparing with its homolog, the high-voltage LiNi 0.5 Mn 1.5 O 4 /graphite battery with 1% TBP shows a preponderant discharged capacity retention of 77.8% after 150 cycles, while the blank is only 66%, this work provides a direction for electrolyte additives’ selection at high voltage and has far-reaching significance for the application of phosphate ester materials.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Shouji Huang,Huapeng Li,Guobao Xu,Xiong Liu,Qi Zhang,Liwen Yang,Juexian Cao,Xiaolin Wei
We develop a facile and low-cost method to construct porous N-doped carbon sheets wrapped MnO cubes with average size of 150 nm in 3D carbon networks by one-step pyrolysis strategy. The unique and novel nanostructure not only provides holes to promote fast ion transport and conductive framework to enhance the charge transfer, but also effectively supplies an elastic buffer space to accommodate volume expansion during cycling. Furthermore, kinetic analysis and other tests reveal that capacitive-controlled Li storage is a vital way and further oxidation of Mn 2+ to a higher state with cycling contributes a lot of capacity. As a result, the composite electrode shows high specific capacity of 917 mAh g −1 at 0.2 A g −1 after 190 cycles, outstanding rate capability of 328 mAh g −1 at 5 A g −1 , and long cycling stability (655 mAh g −1 at 1 A g −1 after 550 cycles, capacity retention of 105%). Furthermore, the composite electrode and LiFePO 4 are used as anode and cathode to assemble full cell which also exhibits excellent rate capability and cycling stability, indicating great application potential. The simple and low-cost strategy of synthetizing the unique nanocomposite structure can also be applied to other composite anode materials for lithium-ion batteries.
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Energy & Environmental Science
·
2020
·Vol. 13
·期 9
·2924-2937
·
IF 30.289
Dongjiang Chen,Chao Feng,Yupei Han,Bo Yu,Wei Chen,Ziqi Zhou,Ning Chen,John B. Goodenough,Weidong He
Transition metal carbides (TMCs), known to deliver extra capacity beyond the theoretical limit, are proposed as emerging high-capacity anodes for next-generation lithium ion batteries (LIBs). Nevertheless, the underlying mechanism for the extra lithium storage in TMCs has not been revealed clearly due to the electrochemical inertness of TMCs to Li in cycling. Here, for the first time, by employing in situ Raman and X-ray photoelectron spectroscopies, we corroborate that the capacity enhancement of Fe3C anodes originates from the physiochemical evolution of solid electrolyte interphase (SEI) and surface carbonaceous materials through three mechanisms: (i) Fe3C catalyzes the reversible conversion between esters and ethers to store extra lithium ions in the SEI; (ii) Fe and inorganic components embedded in the SEI form a reversible surface-conversion reaction of Fe + 3LiF ⇌ FeF3 + 3Li+ + 3e− to contribute additional capacity; and (iii) surficial carbon delivers capacity through surface capacitive effects and Li+ inter/deintercalation processes. With the extra lithium ion storage in the SEI and carbon, the C@Fe3C/Fe anode delivers a high reversible capacity of 808 mA h g−1 after 700 cycles at 1 A g−1. This study provides a fundamental basis for emerging high-capacity TMC anodes to be efficiently explored for next-generation LIBs.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 15
·7280-7287
·
IF 11.301
Ziyue Wen,Yuejiao Li,Zhikun Zhao,Wenjie Qu,Nan Chen,Yi Xing,Yue Ma,Li Li,Feng Wu,Renjie Chen
Poor interfacial contact and Li dendritic growth severely restrict practical applications of Li metal anodes. Herein, we report a novel biomimetic solid-state electrolyte based on injection of 1 M LiTFSI-Py13TFSI ionic liquid electrolyte into a leaf-like Al2O3 skeleton through an in situ sol–gel method. This structure is intended to address the poor contact at the interface and protect the Li metal anode. A large amount of ionic liquid electrolyte was absorbed by the leaf-like Al2O3 skeleton owing to its high specific surface area. This system improved the ionic conductivity and promoted migration of Li+ both in the bulk and at the interface. The lithiophilic Al2O3 skeleton was in close contact with metallic Li and formed a fast Li+ conductive layer (Li–Al–O composition), which facilitated uniform deposition of Li and thus inhibited Li dendrite formation during long-term cycling. Moreover, density functional theory calculations indicated spontaneous generation of a Li–Al–O layer and [Py13]+ in the ionic liquid facilitates this process. Symmetric Li cells assembled with this electrolyte exhibited an extremely long cycle lifetime of 1100 h at a high constant current density. This strategy of a biomimetic leaf-structured electrolyte with a Li–Al–O conductive layer at the interface addresses problems of solid-state Li metal batteries and provides an alternative system for practical applications.
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ACS Applied Energy Materials
·
2020
·
IF 4.473
Hongping Li,Jun Yang,Zhixin Xu,Huichao Lu,Tao Zhang,Suli Chen,Jiulin Wang,Yanna NuLi,Shin-ichi Hirano
The rechargeable lithium metal battery with solid polymer electrolyte has high energy densities, desired safety, and extensive application prospect. However, its practical application is heavily hindered by dissatisfactory ionic conductivity and insufficient suppression of lithium dendrites due to poor mechanical strength. Achieving polymer electrolytes with high ionic conductivity and strong inhibition of lithium dendrites is a challenge. In this study, an integrated composite polymer electrolyte cross-linked with a SiO2-reinforced layer (P-RCL) was prepared by one-step in situ polymerization of vinylene carbonate, ethoxylated trimethylolpropane triacrylate, and methyl propenyl fumed SiO2. The P-RCL exhibited excellent room-temperature ionic conductivity (0.41 mS cm–1), high lithium-ion transference number (0.54), wide electrochemical window (5.1 V vs Li+/Li), and superior interfacial compatibility to Li metal. Moreover, the Li/LiFePO4 cell assembled with P-RCL electrolyte presented outstanding cycling performance (capacity retention of 79.1% for 1000 cycles at 2 C) and effective inhibition of lithium dendrites at room temperature. The reasonable design of advanced polymer electrolytes with integrated cell structure provides the possibilities for future high-energy lithium batteries.
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Energy Technology
·
2019
·Vol. 8
·期 3
·1900986
·
IF 3.163
Leichao Meng,Ruisong Guo,Fuyun Li,Yuanliang Ma,Jianhong Peng,Tingting Li,Yani Luo,Youzhen Li,Xiaohong Sun
V 2 O 3 is considered to be a potential anode material due to its large specific capacity and rich resources. Herein, flock-like V 2 O 3 coated with carbon is prepared through a facile and simple solvothermal method followed by annealing at a relatively low temperature. The structure of V 2 O 3 /C is composed of porous strips. Due to the unique morphology and structure, the V 2 O 3 /C anode material shows excellent electrochemical performance. It delivers a specific discharge capacity of 696 mAh g −1 after 100 cycles, which is 95% of the specific discharge capacity (732 mAh g −1 ) after the sixth cycle. The V 2 O 3 /C anode material annealed at 360 °C (V 2 O 3 /C-360) delivers 601 mAh g −1 at a current density of 300 mA g −1 after 500 cycles. It implies superior cyclic stability of V 2 O 3 /C-360. In addition, the anode also shows excellent rate capability. Specific capacities of approximately 600, 420, and 300 mAh g −1 are obtained at the current densities of 0.3, 2, and 5 A g −1 , respectively. The large current contribution of the capacitive reveals favorable superior lithium storage kinetics. This anode material presents great application potential in high-performance lithium-ion batteries.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Linfeng Peng,Hang Yin,Lu Zou,Faquan Yu
As a promising energy storage technology, Li-CO 2 /O 2 batteries not only deliver ultrahigh discharge capacity but also capture and convert CO 2 into renewable energy. The exploration into the deposition and decomposition kinetics of discharge product (Li 2 CO 3 ) is urgent for the high thermodynamic stability. Herein, the influence of current density on the essential characteristics of Li 2 CO 3 has been explored. The results show that the Li 2 CO 3 with poor crystallinity and elliptical disk morphology can be obtained at medium current density, corresponding to the excellent electrochemical performance including ultrahigh capacity of 5800 mA h/g, lower discharge-charge gap of 1.15 V, and long-term cycle life of 80 cycles. In addition, the morphology and crystallinity of Li 2 CO 3 are tailored by the relative energy barriers for electron migration and O 2 - generation. At a medium current density (500 mA/g), the accelerated electron migration can realize the nucleation rate equivalent to growth one of Li 2 CO 3 . At this time, Li 2 CO 3 will uniformly deposit on the cathode surface, forming elliptical disk morphology with poor crystallinity. Obviously, this work provides new sights for promoting the development of Li-CO 2 /O 2 battery through rational design of catalysts to accelerate the deposition and decomposition processes of Li 2 CO 3 .
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JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Tingmin Lai,Ao Sheng,Zifang Zhang,Wei Li,Jianwen Yang,Shengkui Zhong,Yanwei Li,Yi Pei,Bin Huang
Monocrystalline layered cathode is of particular interest owing to the satisfactory mechanical integrity against long-term cycling. However, the high-temperature calcination , which is perceived as the indispensable reaction condition, favors the formation of Ni 2+ that triggers the Li + /Ni 2+ disorder and the formation of electrochemically inactive NiO. Herein, we develop a SrO-assistant method to synthesize a monocrystalline ultrahigh-Ni LiNi 0.95 Co 0.04 Mn 0.01 O 2 under a moderate calcination temperature. The addition of an appropriate amount of SrO (0.3 wt%, SCN95–Sr-3) facilitates the formation of monocrystalline LiNi 0.95 Co 0.04 Mn 0.01 O 2 (grain size: 2–4 μm) under 790 °C. The obtained LiNi 0.95 Co 0.04 Mn 0.01 O 2 represents excellent electrochemical properties with an initial discharge capacity of 240.5 mAh g −1 and a Coulombic efficiency of 90.1 % at 0.1C (1C = 220 mA g −1 ) in a Li-metal half cell. Upon long-term cycling, the monocrystalline feature with less crystallographic defect effectively enhances the structural stability and inhibits the formation of intergranular cracks, resulting in an enhanced cyclic stability (discharge capacity of 151.0 mAh g −1 maintained after 300 cycles at 1C in a Li-metal half cell). Coupled with a graphite anode, the LiNi 0.95 Co 0.04 Mn 0.01 O 2 || graphite full cell represents a stable cycling at 1C, with a capacity retention of 99.0 % after 100 cycles.
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Small
·
2023
·
IF 13.3
Yuxin Long,Qiang Li,Zidong Zhang,Qingxi Zeng,Dong Liu,Lanling Zhao,Yao Liu,Yebing Li,Yiming Zhang,Kunqian Ji,Zhaorui Zhou,Xue Han,Jun Wang
Li-O 2 batteries could deliver ultra-high theoretical energy density compared to current Li-ion batteries counterpart. The slow cathode reaction kinetics in Li-O 2 batteries, however, limits their electrocatalytic performance. To this end, MoSe 2 and Ni 0.85 Se nanoflakes were decorated in carbon hollow nanoflowers, which were served as the cathode catalysts for Li-O 2 batteries. The hexagonal Ni 0.85 Se and MoSe 2 show good structural compatibility with the same space group, resulting in a stable heterogeneous structure. The synergistic interaction of the unsaturated atoms and the built-in electric fields on the heterogeneous structure exposes abundant catalytically active sites, accelerating ion and charge transport and imparting superior electrochemical activity, including high specific capacities and stable cycling performance. More importantly, the lattice distances of the Ni 0.85 Se (101) plane and MoSe 2 (100) plane at the heterogeneous interfaces are highly matched to that of Li 2 O 2 (100) plane, facilitating epitaxial growth of Li 2 O 2 , as well as the formation and decomposition of discharge products during the cycles. This strategy of employing nonstoichiometric compounds to build heterojunctions and improve Li-O 2 battery performance is expected to be applied to other energy storage or conversion systems.
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高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Yong Wu,Yifan Wang,Facai Wei,Tingting Zhang,Wenda Li,Lingyan Huang,Ruijuan Qi,Jianwei Fu,Chengbin Jing,Jiangong Cheng,Shaohua Liu
Bottom-up molecular engineering by rational design has emerged as a promising strategy for exploring advanced organic cathodes. However, directly programming organic moieties into high-performance electro-active materials remains a great challenge. Herein, we design and synthesize a hydrogen-bonded supramolecule (hexaazatrinaphthalene hexacarbonitrile, HATN-6CN) anchored with abundant cyano groups, which ensures structural stability, extended π-conjugated system, and multiple redox active centers. As a result, the HATN-6CN cathode delivers a high specific capacity (297.6 mAh g –1 at 0.5 A g –1 , 225.2 mAh g –1 at 5 A g –1 ) and outstanding long-term cycling performance (191.9 mAh g –1 over 1000 cycles at 5 A g –1 with a capacity retention of 85.2 %). Moreover, the charge storage mechanisms, structural evolution, and reversibility during the redox process of HATN-6CN were systematically investigated. This work offers a feasible and promising avenue for bottom-up molecular engineering of organic electrodes by rational design.
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