Nano Research
·
2018
·Vol. 12
·期 3
·517-523
·
IF 7.994
Liu Tie,Wang Leidanyang,Huang Tao,Yu Aishui
Design and fabrication of framework-structured porous precursors have been regarded as a prospective albeit challenging strategy to obtain bimetal/NC-enriched bifunctional elecrocatalysts. In this work, an effective bottom-up approach involving solution-based self-assembly and a post-annealing process was developed to confine (Co, Zn)-N-C active sites into N-enriched graphitic carbon nanocages. This novel architecture containing N-doped-C stabilized bimetallic nanoparticles derived from ZIF precursors was well-studied by a series of characterization and analysis techniques. Details were given that these well-dispersed (Co, Zn) nanoparticles were encapsulated into the pyridinic-N-dominated graphitic carbon nanocage with a total metal loading of approximately 7.4 at.%. This favorable hierarchical structure not only enhances the electron conductivity, but also owns a sufficient BET surface area facilitating the gas-liquid-solid triphase reaction and producing more space to store discharge products. Importantly, results infer that the interesting nanoframes manifests a satisfying ORR/OER activity and enhanced cell performance whether liquid or solid-state electrolytes are used. As such, our work rationalizes that this type of cage-shaped bimetal-N-C material is promising for high-performance Li-O 2 batteries.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Weiqin Wang,Yuanying Yang,Yanna NuLi,Jingjing Zhou,Jun Yang,Jiulin Wang
We fabricate in-situ carbon-encapsulated cuprous sulfide (Cu 2 S@C) composite through a metal-organic framework (MOF)-derived sulfurization method and compare its electrochemical performance as a displacement reaction cathode of hybrid Mg 2+ /Li + batteries with 0.4 mol L −1 (PhMgCl) 2 -AlCl 3 +1.0 mol L −1 LiCl/THF nucleophilic hybrid electrolyte and 0.2 mol L −1 Mg(HMDS) 2 -(AlCl 3 ) 2 –MgCl 2 +1.0 mol L −1 LiTFSI/DME non-nucleophilic hybrid electrolyte. Benefiting from the intrinsic property of Cu 2 S, well-defined hybrid porous structure and carbon encapsulation derived from MOFs, the Cu 2 S@C composite exhibits 399.2 mA h g −1 discharge capacity and the capacity maintains at approximately 150 mA h g −1 at 0.05 C after 50 cycles in the nucleophilic hybrid electrolyte. The mechanism investigation verifies that the formed Cu 1.96 S in the first discharge process succeeds to transform into MgS and Li 2 S, which results in the reversible displacement reaction dominantly occurring between Cu 1.96 S and Cu during subsequent cycles. When using the non-nucleophilic hybrid electrolyte, an enhanced cycling stability can be achieved due to the mitigation of ionic sulfide dissolution. The present work demonstrates the feasibility of building the structural design of low-cost displacement reaction cathode with more compatible electrolyte, and provides the potential of establishing practical hybrid Mg 2+ /Li + batteries for energy storage.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 5
·3350-3355
·
IF 3.201
Ailijiang Abudurusuli,Kui Wu,Shilie Pan
Four new quaternary chalcogenides A2Ba7Sn4Q16 (A = Li, Na; Q = S, Se) were successfully synthesized in vacuum-sealed silica tubes for the first time. All of them crystallize in the noncentrosymmetric (NCS) cubic I3d space group with the cell parameters ranging from 14.807 to 15.4163 Å and Z = 4, respectively. Interestingly, their isostructures are different from the structural transformations (from tetragonal to trigonal) appearing in previously reported Na2BaSnQ4 compounds. As observed in their structures, (Na/Ba)Q4 and SnQ4 units alternately connect with each other by sharing corners to build a three-dimensional (3D) framework structure with charge-balanced Ba cations located within tunnels, which is different from the observation that the Na atoms located inside the tunnels formed by the interconnection of the BaS8 and SnS4 units in Na2BaSnS4. Optical properties (diffuse-reflection, IR, and Raman spectra) were also systematically studied and the results indicate that their optical bandgaps are in the range from 1.75 to 2.5 eV. Moreover, the second harmonic generation (SHG) responses of the title compounds were also measured to be about 0.1–0.5 times higher than that of benchmark AgGaS2 under 2.09 μm radiation.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Zhanying Chang,Yiming Zhang,Wei He,Jin Wang,Hongfei Zheng,Baihua Qu,Xinghui Wang,Qingshui Xie,Dong-Liang Peng
Li-rich layered oxides (LLOs) are supposed to be the most competitive cathode materials for lithium-ion batteries (LIBs), because of the high theoretical specific capacities (>250 mAh g–1). However, there are some inherent inferiorities, such as the low initial Coulombic efficiency (ICE) and the rapid capacity/voltage decay, that hinder the large-scale commercial applications of LLOs. Herein, we successfully obtained spinel-coated and phosphate-doped Co-free Li-rich layered oxides (Co-free LLOs) by cotreatment methods, using weakly acidic and alkalinity (NH4H2PO4 solution), which could effectively improve the electrochemical performance. The spinel coating could not only accelerate the movement of Li+ but also restrain O2 release, while the doping PO43– could inhibit the transition-metal (TM) migration between the oxygen octahedral site and the oxygen tetrahedral site. The optimized Co-free LLOs cathode treated with 3% NH4H2PO4 solution could deliver a high ICE of 88% and a high discharge capacity up to 159.5 mAh g–1 after 500 cycles at 1C (1C = 250 mA g–1). Moreover, the voltage fading decreases from 0.64 mV to 0.32 mV per cycle during cycling. This work provides new insights for developing high-performance Co-free LLOs cathode materials.
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高影响因子
Small
·
2021
·Vol. 17
·期 41
·2102454
·
IF 13.281
Peng Liu,Jianwei Zhang,Lei Zhong,Sheng Huang,Li Gong,Dongmei Han,Shuanjin Wang,Min Xiao,Yuezhong Meng
Lithium (Li) metal has been generally noticed as the most prospective anode for next-generation batteries attributed to its outstanding theoretical capacity and low electrochemical potential. Nevertheless, the unstable solid-electrolyte interphase (SEI) and uncontrollable dendrite growth cause poor reversibility and fetter the practical application of Li metal anodes. Herein, a new organic–inorganic hybrid polymer artificial SEI (POSS-LiBMAB) layer with uniform lithium-ion paths at a molecular level is designed to stabilize Li metal anodes. The SEI layer is constructed by the thiol–ene “click chemistry” reaction between inorganic polyhedral oligomeric silsesquioxane containing eight-mercaptopropyl (POSS-SH) with lithium bis (allylmalonato) borate (LiBMAB) on Li foil. What is more, the POSS-LiBMAB film can be cross-linked and self-reinforced via intermolecular S C bonds. Benefiting from its flexible polymeric covalent structure and noble inorganic Si 8 O 16 -type cubes, the organic–inorganic hybrid polymer layer is flexible and effectively tolerates the volume change of Li metal anodes during plating/stripping cycles. In addition, this layer shows loose and uniformly distributed electrostatic interaction between Li + and charge delocalized sp 3 boron–oxygen anions, which aids to form a uniform intermolecular Li + path regulating the homogeneous distribution of Li + flux on Li anodes. Finally, the designed POSS–LiBMAB layer has high ionic conductivity and lithium-ion transference number, which can effectively promote Li + diffusion and guide Li deposition beneath the SEI layer. Therefore, with the protection of the POSS-LiBMAB layer, the Li metal anode exhibits stable cycling at 5 mA cm −2 for more than 1000 h, and the LFP//Li full cells also present outstanding cycling stability.
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高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 11
·2389-2394
·
IF 4.154
Xiang Peng,Kai Huang,Shipai Song,Fang Wu,Yong Xiang,Xiaokun Zhang
A garnet-polymer composite electrolyte with high Li + conductivity and transference number is developed using microporous Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) framework as the matrix. The LLZTO framework, fabricated by a template-assisted gel-casting process, possesses micron-sized grains and well-fused grain boundaries, eliminating the low-conductive bottleneck at the interfaces between the ceramic blocks, and providing conductive and continuous networks for Li + transport. As a result, the garnet-polymer composite electrolyte displays a high ionic conductivity (2.61×10 −4 S cm −1 at 25 °C), an ultrahigh Li + transference number of 0.71, as well as excellent thermal, structural, and electrochemical stabilities. Benefiting from the desired physical and chemical properties, the presented composite electrolyte enables a Li−Li cell to be cycled for more than 600 h at 25 °C. In addition, the integrated LiFePO 4 /CPCE/Li cells also show excellent cycling stability with a specific capacity of 133.2 mAh g −1 after 100 cycles under 50 °C. This study demonstrates a significant optimization on the microstructure of composite electrolytes that can be utilized for all-solid-state lithium batteries. Graphical Continuous paths : We demonstrated a garnet-polymer composite electrolyte exhibiting excellent Li+ conductivity and transference number, by applying a microporous Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) framework with well-fused grain boundary
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Binyu Lu,Liuyi Hu,Wenkui Zhang,Jun Zhang,Yang Xia,Yongping Gan,Xinping He,Xinhui Xia,Ruyi Fang,Hui Huang
Construction of quasi-solid-state lithium metal batteries (LMBs) by in situ polymerization is considered a key strategy for the next generation of energy storage systems with high specific energy and safety. Poly(1,3-dioxolane) (PDOL)-based electrolytes have attracted wide attention among researchers, benefiting from the low cost and high ionic conductivity. However, interfacial deterioration and uncontrollable growth of lithium dendrites easily appeared in LMBs due to the high reactivity of lithium metal, resulting in the failure of LMBs. In this work, a strategy is developed of using Ga(OTF)3 as the initiator to obtain a PDOL-based gel electrolyte (GaPD). In addition, a hybrid stable solid electrolyte interphase (SEI) of lithium fluoride/Li2O/Li–Ga alloys is observed on the surface of lithium metal. Combined with density functional theory calculations, the hybrid SEI shows high affinity toward Li+, indicating that a uniform deposition of Li+ could be achieved. Therefore, the Li/GaPD/Li cell operates stably for 1600 h at room temperature. In addition, the LiFePO4/GaPD/Li cell retains a capacity retention rate of 90.2% over 200 cycles at 1 C. This work provides a reference for the practical application of in situ polymerization technology in high-performance and safe LMBs.
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 3
·3040-3047
·
IF 2.986
Chunhai Jiang,Weiqiang Ding,Huiqing Wu,Zhiyang Yu,Lili Ma,Zhimin Zou
A flexible, free-standing composite anode with Li 4 Ti 5 O 12 nanosheet arrays anchoring on plain-weaved carbon fiber cloth (LTO@CC) is prepared by a hydrothermal and post-annealing process assisted by a TiO 2 seed layer. The LTO@CC anode free from polymeric binder and conducting agent exhibited much higher lithium storage capacity and cycling stability than the conventional slurry-processed electrode using the dandelion-like Li 4 Ti 5 O 12 microspheres prepared by the same hydrothermal process. A high specific capacity of 128.8 mA h g −1 was obtained at a current rate of 30 C (1 C = 175 mA g −1 ), and almost negligible capacity loses was observed when the cell was cycled at 10, 20 and 30 C each for 100 cycles. The carbon fiber matrix contributed to Li storage at low current rate, but the LTO nanosheet arrays have played the dominant role on the excellent rate capability. The improved electrochemical performance can be attributed to the synergetic effect between the hierarchical Li 4 Ti 5 O 12 nanosheet arrays and the carbon fiber matrix, which integrated short Li + diffusion length , three-dimensional conductive architecture and well preserved structural integrity during the high rate and repeated charge-discharge measurements.
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2026
·
IF 2.9
Li Fengyin,Jiang Xueao,Ma Ning,Zhao Min,Lv Yang,Cao Xuefei,Hu Zewei,Hua Shuai,Zhang Limin,Wang Renke
Poly(ethylene oxide) (PEO)-based solid polymer electrolytes are attractive for energy storage, especially for solid-state lithium metal batteries, but their use is hindered by slow Li + transport and unstable Li interfaces. Here, we report a low-loading ionic liquid (IL)-assisted local solvation strategy by incorporating a highly concentrated LiTFSI/sulfolane component and a small amount of Py14TFSI into PEO. Spectroscopy and DFT calculations show that Py14TFSI acts as a coordination regulator rather than a simple plasticizer, decreasing Li + -TFSI − contact ion pairs from 58% in PS to 41% in PSP and promoting more weakly coordinated TFSI − species. The optimized PSP electrolyte delivers an ionic conductivity of 0.116 mS cm −1 at 30 °C, an activation energy of 28.55 kJ mol −1 , and a Li + transference number of 0.40. Consequently, Li||PSP||Li cells cycle for 250 h at 1 mA cm −2 , and LFP||Li cells retain 97% capacity after 150 cycles. Graphical abstract
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Fanghui Wang,Jiajun Wan,Jie Liu,Rongfang Wang,Lei Wang
To achieve practical high energy density of Li-S battery, it is crucial to construct high-loading sulfur electrodes. However, the poor mechanical stability and severe shuttle effect of high-loading sulfur cathodes during cycling limit the cycling stability. Herein, a mechanically robust network binder with strong affinity towards polysulfides has been designed to stabilize the high-loading sulfur electrode. Lithium polysilicate (LSO) possesses abundant strong polar Si-O and Si = O bonds, which not only can effectively adsorb polysulfides but also firmly connect tamarind polysaccharide gum (TPG) biopolymer chains. As a result, the c-LSO-TPG binder can efficiently maintain the integrity of high-loading sulfur cathode and suppress the polysulfide shuttling during cycling. In particular, under a high sulfur loading of 5.4 mg cm −2 , the sulfur electrode can run 200 cycles steadily, delivering an areal capacity of 2.7 mAh cm −2 . This provides a new avenue for the research and development of robust binders for high-loading and long-lifespan Li-S batteries.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 1
·250-258
·
IF 1.798
Chen Hedong,Hou Xianhua,Qu Lina,Qin Haiqing,Ru Qiang,Huang Yuan,Hu Shejun,Lam Kwok-ho
Si@carbon composites have been successfully prepared via spray drying and subsequent calcination using PSA microspheres, nano-silicon and natural graphite as raw materials. Nano-silicon with a 20–100 nm particle size is prepared by radio-frequency electromagnetic induction. Such small nano-silicon particles can effectively accommodate the volume expansion of the Si@carbon anode. Additionally, the unique core–shell structure of Si@carbon composites can effectively alleviate the agglomeration of nano-silicon particles. Electrochemical tests show that the Si/carbon electrode delivers a high initial discharge capacity of approximately 1404.27 mAh g −1 with an initial coulombic efficiency of 82.4 %. The discharge specific capacity remains as high as 73.6 % after 100 charging-discharging cycles, demonstrating the electrode material’s good cycle stability. In addition, the corresponding specific capacity of the Si@carbon composites electrode remains at around 1150 mAh g −1 at a current density of 1 A g −1 . And when the current density is 0.1 A g −1 , its specific capacity can still remain at around 920 mAh g −1 , indicating excellent capacity reversibility. Therefore, Si@carbon composites are superior anode materials for high-performance Li-ion batteries.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 45
·38782-38789
·
IF 3.289
Shi-Ming Wang,Lin Liu,Zhi-Yong Huang,Zheng-Bo Han
In this research, three vanadium substituted polyoxometalates (POMs) K3+n[PW12−nVnO40] (abb. PW12−nVn) (n = 1, 2, 3)-based electrochromic (EC) films were prepared using the electrodeposition method. The films not only show a good performance in terms of EC properties in an H+-based aqueous electrolyte, but also show good EC performance in a Li+-based non-aqueous electrolyte. Although the EC activity of POMs is lower in the neutral media than in acid media, the use of the neutral non-aqueous electrolyte does not result in the suppression of the EC performance. The large diffusion coefficient of the Li+ in the porous films guarantees the high performance. For the PW11V, PW10V2 and PW9V3-based films, the coefficients of Li+ are 4.05 × 10−11, 4.11 × 10−11, and 1.04 × 10−11 cm2 s−1, respectively. The PW10V2-based film shows the shortest response time for coloration which is even shorter than that shown in the H+-based aqueous electrolyte. The optical contrast of the films is also nearly the same as which achieved in the aqueous electrolyte media. The application of the non-aqueous neutral electrolyte would be beneficial for the fabrication of the POM-based EC device.
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高影响因子
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