Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 44
·23035-23042
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IF 8.867
Mingbao Huang,Caihong Chen,Songping Wu,Xiaodong Tian
Herein, a novel and efficient strategy was established to synthesize few-layer graphene-anchored Fe3O4 nanocomposites (FLG-anchored Fe3O4) through a facile ball-milling route followed by annealing treatment. The as-prepared FLG-anchored Fe3O4 nanocomposites, as an anode material of LIBs, presented remarkable electrochemical performances at a high temperature of 85 °C, i.e., an excellent reversible capacity of 1413 mA h g−1 at a current density of 1.0 A g−1 after 100 cycles and an impressive rate performance of 768 mA h g−1 at a large current density of 5.0 A g−1 even after 100 cycles. These superior performances can be considered as a comprehensive consequence of the following factors: (1) the robust anchor between in situ synthesized Fe3O4 nanoparticles and few-layer graphene via a Fe–O–C linkage maintains structural integrity, enabling excellent cycling stability even at high temperatures; (2) accelerated dynamic diffusion of Li+ ions during lithiation/delithiation at 85 °C leads to a decreased polarization effect, producing enhanced reversibility; (3) enhanced pseudocapacitive behaviour at high temperatures holds partial capacity contribution. Due to these attributes, this material is a reliable and promising candidate for an anode material for heavy-duty Li-ion batteries that operate under harsh environments.
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LUMINESCENCE
·
2017
·Vol. 32
·期 6
·908-912
·
IF 1.509
Renping Cao,Jinlong Zhang,Wudi Wang,Qianglin Hu,Wensheng Li,Wen Ruan,Hui Ao
CaSnO 3 :Bi 3+ blue-emitting phosphor was synthesized using a high-temperature solid-state reaction method in air. The crystal structures and luminescence properties were investigated. A broad emission band peaking at ~448 nm upon excitation at 262 and 308 nm was observed in the range 330–680 nm at room temperature due to 3 P 1 → 1 S 0 transition of the Bi 3+ ion. The chromaticity coordinate was (0.1786, 0.1665). The optimal Bi 3+ ion concentration was ~0.6 mol% in CaSnO 3 :Bi 3+ phosphor. The emission spectrum of CaSnO 3 :Bi 3+ phosphor showed a blue-shift with increasing temperature from 50 to 300 K due to the influence of temperature on the electron transition of the Bi 3+ ion. The emission intensity of CaSnO 3 :Bi 3+ phosphor may be increased ~1.45 times by co-doping Li + ions as a charge compensator and fluxing agent. The luminescence mechanism is explained by a configurational coordinate diagram of Bi 3+ ion in CaSnO 3 :Bi 3+ phosphor.
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RSC Advances
·
2016
·Vol. 6
·期 79
·75632-75639
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IF 3.289
Weixing Yang,Ronglan Zhang,Kai Luo,Weiping Zhang,Jianshe Zhao
A series of metal 2,9,16,23-tetraaminophthalocyanines [TAPcM, M = Cu(II), Ni(II), Zn(II), Fe(II), Mn(II)] have been prepared and used to chemically modify fluorinated multi-walled carbon nanotubes (F-MWCNTs). The generated composites TAPcM/MWCNTs were characterized by IR, UV-Vis and XRD. The electrocatalytic activity of all the composites was evaluated by adding them into the electrolyte of the Li/SOCl2 battery and taking cyclic voltammograms in simulated circumstances. The results show that the composites can dramatically improve the capacity of the battery, and their electrocatalytic performance strongly depends on the metal phthalocyanine species. The order of the electrocatalytic activity of 2,9,16,23-TAPcM and 2,9,16,23-TAPcM/MWCNTs with different metal ions in the center is Mn(II) > Ni(II) > Zn(II) > Fe(II) > Cu(II). The excellent electrocatalytic performance of the modified F-MWCNTs may be due to the fine synergistic effect between the metal phthalocyanines and the MWCNTs.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Xianxi Liu,Hongying Hou,Yixuan Wang,Sen Ming,Yutao Niu,Xiaohua Yu,Ju Rong,Shizhao Xiong
High ionic resistance at the electrolyte/electrode interfaces is considered one of the main challenges in developing solid-state lithium-metal batteries. Herein, homogeneous and continuous Li+ transport channels are constructed from the cathode to the anode to reduce the solid–solid interface resistance. This strategy involves the surface modification of polyvinylidene fluoride hexafluoropropylene (PVDF-HFP) and Li6.75La3Zr1.75Ta0.25O12 (LLZTO), which are the key components in the solid-state electrolyte, by chemically grafting zwitterionic sulfonate betaine (SB) to endow the ionic conductivity and improve the solid–solid interface compatibility. Therefore, a series of composite solid-state electrolytes were prepared by optimizing the contents of the polymer matrix (SB-PVDF-HFP), ceramic powder (SB-LLZTO), and lithium salt. The designed composite solid-state electrolyte was used as the electrolyte film and the ion-conductive binder phase in the cathode. The assembled Li/LiFPO4 cell delivered a reversible capacity of 146.6 mA h g−1 at 1.0 C, higher than the cell without surface modifications. Furthermore, the results of molecular dynamics simulation showed that higher diffusion coefficient (D) of Li+ with the modified components could promote the creation of fast Li+ transport channels in the bulk electrolyte and at the interface, facilitating the electrochemical performance of the solid-state battery.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Shujun Qiu,Longde Duan,Errui Wang,Jiaxiao Meng,Fen Xu,Lixian Sun,Hailiang Chu
The development of cathode materials exhibiting high capacity and superior cycling performance plays a pivotal role in enhancing the energy density of lithium-ion batteries (LIBs). In this context, lithium-rich layered oxides (LLOs) have emerged as leading candidates among cathode materials owing to their exceptionally high specific capacities. However, prolonged cycling induces the detrimental interfacial reactions between LLOs and electrolytes, leading to oxygen release, transition metal dissolution, and structural microcracks, collectively driving progressive voltage fade and capacity deterioration. In this study, lithium tri(tert-butoxy)hydridoaluminate (LTBA) was employed as a functional electrolyte additive to optimize the electrochemical performance of a model Li-rich layered oxide cathode (Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 , denoted as LMNCO). Remarkably, the LTBA-modified LMNCO exhibited a capacity retention of 83.6% after 300 cycles at 1 C, significantly outperforming the bare electrolyte system (only 45.6% retention). Notably, the voltage fade in LTBA-modified electrolyte was attenuated to 1.31 mV per cycle, representing a 39.4% reduction compared to conventional electrolyte (2.16 mV per cycle). The experimental results indicate that the LTBA additive in electrolyte acts as an HF scavenger and moderate reducing agent, preventing transition metals from dissolving in the LMNCO cathode.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Majed Y.A. Almashnowi
All-solid-state Li-batteries have become viable options for energy storage materials over-commercialized Li-ion batteries due to their safety, wider electrochemical stability window, and impressive energy density. All-solid-state Li-based batteries use sulfide-based electrodes with high theoretical specific capacity and ionic conductivity, whereas solid electrolytes have recently shown improved energy density. However, using Li-based batteries in all-solid-state batteries for practical purposes is still a great challenge because of their interfacial issues among the solid electrolytes and electrodes. To elucidate these interfacial issues, this study presents an in-situ liquid-phase approach to prepare CoS 2 @Li 7 P 3 S 11 as the electrode for all-solid-state Li-batteries by coating Li 7 P 3 S 11 solid electrolyte on cobalt disulfide nanoparticles. Originating from enhanced intimate contact and improved area of contact in the solid electrolyte of sulfide and active material, the synthesized CoS 2 @Li 7 P 3 S 11 nanocomposites employed as a cathode in all-solid-state Li-battery, which shows the ultrahigh cyclic stability and reversible capacity. All-solid-state Li-based batteries consist of CoS 2 @Li 7 P 3 S 11 nanocomposites, Super P, neat Li 7 P 3 S 11 as cathode material, and Li metal as an anode electrode material ( Li-75 %Li 2 S-24 %P 2 S 5 -1 %P 2 O 5 /Li 7 P 3 S 11 /CoS 2 @Li 7 P 3 S 11 /Li). At low (100 mA/g) and high (1000 mA/g) current density, exhibits an 1112.6 mAh/g reversible discharge capacity after 30 cycles and 208.4 mAh/g after 200 cycles, respectively.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yanling Chai,Jinchao Chen,Xiaofeng Fang,Fang Li,Xingran Zhang
Polyelectrolyte multilayer nanofiltration (NF) membranes have garnered attention for their potential in Mg 2 ⁺/Li⁺ separation applications, particularly due to their positively charged nature and the versatility offered by the layer-by-layer (LbL) self-assembly technique. However, these membranes often face significant challenges in balancing high ion selectivity with adequate water permeability. Addressing these limitations, this study introduces a novel approach by grafting a zwitterionic material, trimethylamine N-oxide (TMAO), onto polyacrylamide hydrochloride (PAH), creating a new cationic polyelectrolyte (TPAH). By cyclically depositing sodium polystyrene sulfonate (PSS) and TPAH onto a polyethersulfone (PES) substrate, we have successfully fabricated a high-performance NF membrane ( i.e. , (PSS/TPAH) n ) that demonstrates enhanced Mg 2 ⁺/Li⁺ selectivity with high water permeability. TMAO features shorter distances between its positive and negative charge groups and smaller dipoles compared to other zwitterions. These characteristics enhance its ability to resistance to salt effects and transfer charge from amine oxide to water molecule. Furthermore, the grafting of TMAO enhanced the hydrophilicity of TPAH and regulated the charge distribution of the polyelectrolyte. Compared to the control membrane (PSS/PAH) n , the optimized membrane (PSS/TPAH) n showed reduced rejection of LiCl from 60.9 ± 2.7 % to 35.9 ± 1.5 %, while that of MgCl 2 increased from 94.3 ± 1.6 % to 96.1 ± 0.7 %. Additionally, water permeability improved from 9.2 ± 0.9 LMH/bar to 16.1 ± 0.5 LMH/bar. Notably, the membranes exhibited an improved selectivity for Mg 2+ /Li + ions in synthetic saline, reaching a maximum of 30.5 ± 1.5, highlighting its potential for practical separation applications. Density functional theory simulations indicate that TMAO not only enhances Donnan effect and intensify ion dehydration of polyelectrolyte multilayers NF membranes but also increases their hydrophilicity. In general, these polyelectrolyte multilayers NF membranes exhibit considerable promise for multiple applications, such as seawater pretreatment, groundwater softening and lithium extraction.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ping Wang,Peixi Wang,Jie Wang,Shoutao Lv,Jiaqing Wang,Hui Zheng
With the rapid development of wireless charging technology, there is a growing demand for ferrite materials with high permeability, high saturation magnetic induction intensity, and low power loss. This study aims to enhance the electromagnetic performance of NiCuZn ferrite by co-doping Nb 5+ and Li + . The influence of the doping levels Nb 5+ and Li + on the morphology, crystal structure, and electromagnetic properties of NiCuZn ferrite were studied in detail. Structural analysis shows that the lattice constant decreases as the Nb 5+ -Li + doping concentration increases, and the NiCuZn ferrite exhibits a high density and homogeneous microscopic morphology at the optimum concentration of x = 0.004. Specifically, at a doping concentration of x = 0.004, the magnetic permeability at 1 MHz measured at 1112.1, the saturation magnetic induction intensity reached 458.98 mT, and the power loss was minimized to 521.85 kW/m 3 , demonstrating significant improvement in the transmission power of wireless charging applications.
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Batteries & Supercaps
·
2024
·
IF 5.1
Qian Zhang,Jiajun Wan,Qingping Gao,Jie Liu
Graphical Owing to the stronger molecular polarity of inorganic polymer compared to organic polymer, robust chemisorption towards polysulfides can be achieved for the as-designed spider-web polymer blocking layer. The cycling stability of the high-loading Li−S battery with a sulfur loading of 7.15 mg cm −2 has been obviously improved, delivering a high areal capacity of 5.26 mAh cm −2 after 50 cycles. The cycling performance of high-loading Li−S batteries is still puzzled by the serious shuttle effect of polysulfides. Modifying the commercial separator with polysulfide anchoring materials has been demonstrated as an economical and effective approach to block the polysulfide shuttle. Herein, a cobweb-like polymer polysulfide-blocking layer has been constructed via crosslinking between lithium polysilicate (LP) inorganic oligomer and tannic acid (TA) dendritic polymer. Owing to the strongly polar Si−O and Si=O bonds in LP, the spider-web polymer possesses robust affinity towards polysulfides, indicated by the theoretical calculations. Dendritic polymer TA as the skeleton contributes to effectively exposing the abundant polar functional groups to powerfully capture the polysulfides. As a result, the cycling stability of high-loading Li−S batteries has been obviously improved. The Li−S battery with sulfur loading of 3.44 mg cm −2 can stably cycle 100 cycles with a high capacity of 685.1 mAh g −1 and columbic efficiency of 99.82 %. Even the sulfur loading increases to 7.15 mg cm −2 , the Li−S battery can still deliver a high areal capacity of 5.26 mAh cm −2 after 50 cycles.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Minghui Li,Cai Chen,Hongze Luo,Qingshuai Xu,Keyou Yan,Yongcai Qiu,Guangmin Zhou
Li metal anodes are considered among the most ideal candidates for next generation batteries owing to their lowest electrochemical potential and high theoretical capacity. However, the highly reactive Li metal is subject to continuous side reactions with conventional carbonate electrolytes. The resulting unsatisfying solid electrolyte interface (SEI) induces severe Li dendritic growth. Therefore, there is an urgent need to effectively control the components of SEI to solve the electrolyte/anode interface electrochemical instability. Herein, LiDFP and LiNO3 are introduced into the electrolyte to modulate the composition of the SEI. Owing to the lower lowest unoccupied molecular orbital (LUMO) energy levels of LiDFP and LiNO3 relative to those of the solvents, LiDFP and LiNO3 have preferential reducibility and thus generate a stable SEI containing LiF and Li3N, which has swift ion migration kinetics and homogeneous Li deposition behaviors. As a result, our electrolyte modified by additives enables the anode to achieve an excellent coulombic efficiency of 98% and exhibits an ultra-long cycling life of over 700 h in symmetrical cells. Li metal full cells paired with the LFP or NCM811 cathode also have excellent long cycling performance. This work demonstrates that additive-modified electrolytes are a viable and simple strategy for the evolution of Li metal batteries.
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ACS Nano
·
2024
·
IF 15.8
Zibo Zhang,Jian Wang,Haozhe Qin,Bao Zhang,Hongzhen Lin,Weitao Zheng,Dong Wang,Xiaobo Ji,Xing Ou
Lithium metal batteries (LMBs) offer significant advantages in energy density and output voltage, but they are severely limited by uncontrollable Li dendrite formation resulting from uneven Li+ behaviors and high reactivity with potential co-solvent plating. Herein, to uniformly enhance the Li behaviors in desolvation and diffusion, the local Li+ solvation shell structure is optimized by constructing an anion-braking separator, hence dynamically reducing the self-amplifying behavior of dendrites. As a prototypal, two-dimensional lithiated-montmorillonite (LiMMT) is blade-coated on the commercial separator, where abundant −OH groups as Lewis acidic sites and electron acceptors could selectively adsorb corresponding FSI– anions, regulating the solvation shell structure and restricting their migration. Meanwhile, the weakened anion mobility delays the time of breaking electrical neutrality, and the Li nucleation density is quantified through the respective experimental, theoretical and spectroscopical results, providing a comprehensive understanding of modifying anion and cation behaviors on dendritic growth suppression. As anticipated, a long Li plating/stripping lifespan up to 1800 h and a significantly increased average Coulombic efficiency of 98.8% are achieved under 3.0 mAh cm–2. The fabricated high-loading Li-LFP or Li-NCM523 full-cells display the cycle durability with enhanced capacity retention of nearly 100%, providing the instructive guide towards realizing dendrite-free LMBs.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xian Hou,Jianping Zhou,Sumei Huang,Wei Ou-Yang,Likun Pan,Xiaohong Chen
Circular plate like lithium doped hierarchical TiO 2 (Li-hier-TiO 2 ) nanostructures were synthesized and scattered on the compact TiO 2 layer as a quasi-scaffold layer for perovskite solar cells (PSCs). The quasi-scaffold layer provides superior contact properties with perovskite layer and helps to form the high quality perovskite film with better crystallinity and less pin-holes. Simultaneously, Li-hier-TiO 2 quasi-scaffold compared to pure hier-TiO 2 quasi-scaffold exhibits superior electronic properties due to the reduced trap states together with better electron transport and extraction abilities. PSCs using Li-hier-TiO 2 quasi-scaffold layer to host the CH 3 NH 3 PbI 3 photoactive layer produce substantially higher PCE of 18.25% with suppressed hysteretic behavior, which is obviously higher than PCE (15.64%) of PSCs using pure hier-TiO 2 quasi-scaffold layer.
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