Inorganic Chemistry Frontiers
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2020
·Vol. 7
·期 22
·4438-4444
·
IF 5.958
Yakun Tang,Yang Gao,Lang Liu,Yue Zhang,Jing Xie,Xingyan Zeng
Li2FeSiO4 is a superior cathode material for lithium ion batteries (LIBs) owing to its high capacity, low cost, and superior stability. Exhilaratingly, the material also exhibits the desired electrochemical performance as the anode for LIBs in comparison with traditional carbon materials. However, the Li2FeSiO4 anode is subject to a fatal capacity degradation in long cycles, due to its low conductivity and serious particle agglomeration. With inspiration from the unique architecture based on the hybrid nanotubes consisting of active nanoparticles embedded in CNTs, a simple and efficient sol–gel method combined with subsequent calcination has been developed for the synthesis of porous Li2FeSiO4/C hybrid nanotubes. Benefiting from the intrinsic increased conductivity of the hybrid and its robust structure, as the anode for LIBs, it exhibits a high capacity (444.7 mA h g−1 at 0.2 A g−1), superior long cycling stability (161 mA h g−1 at 2 A g−1 after 3000 cycles) and an ultra-high rate capability (261.1 mA h g−1 at 1 A g−1 and 112.9 mA h g−1 at 8 A g−1). Surprisingly, the Na2FeSiO4/C hybrid nanotube also shows satisfactory application prospects as the anode for sodium ion batteries (SIBs). Such hybrids furnish attractive potential for high-performance LIB/SIB anodes, which would be a promising substitution for carbon anodes.
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Nano Energy
·
2020
·
IF 16.602
Feihong Ren,Zhendong Li,Yun Zhu,Patrice Huguet,Stefano Deabate,Deyu Wang,Zhe Peng
Uneven nucleation and fragile solid electrolyte interphase (SEI) restrict the practical application of lithium (Li) metal anode. A versatile strategy to simultaneously overcome these two drawbacks is critical for Li metal batteries (LMBs). Herein we propose an “aggressive aluminum (Al) pulverization” strategy to form abundant artificial nucleation sites and robust SEI films adjacently, leading to homogeneous Li deposition/stripping and high Li Coulombic efficiency. A core-shell structure with Al core and alumina-silica (Al 2 O 3 –SiO 2 ) shell, Al@Al 2 O 3 –SiO 2 (AAS), could be easily synthesized, by modulating the chemical diffusion of silicon (Si) element towards Si–Al alloy surface. The active SiO 2 sites not only contribute to form the robust SEI layer, but also facility the lithiation of the AAS, accelerating the conversion of reversible Li–Al alloy into inert Li 3 Al 2 phase. The as-generated AAS with Li 3 Al 2 and Li 12 Si 7 phases possess negligible Li nucleation over-potential (~0.7 mV), serving as an optimal structure for dendrite-free Li plating/stripping with a prolonged life-span of 6 times longer than that of the unprotected counterpart in carbonate electrolytes.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
·
IF 3.807
Zhen-Kun He,Ali Reza Kamali,Zeng-Rong Wang,Qiang Sun,Zhongning Shi,Dexi Wang
Li surface diffusion kinetics is an important parameter in determining the electrochemical performance of metal oxide electrodes used in Li ion batteries. Here, we investigate this parameter in SnO 2 nanobelts . A low cost, simple and facile in-situ calcination method is developed to fabricate highly crystalline SnO 2 nanobelts with surface oxygen vacancies using commercially available tin oxide particles as the precursor. The phase composition , morphology and surface characteristics of the SnO 2 nanobelts are investigated by several techniques, including the X-ray diffraction and photoelectron spectroscopy, high resolution electron microscopy and electrochemical evaluations. The Li ion surface diffusion coefficients of nanobelts are investigated by impendence spectroscopy and sweep voltammetry measurements; and found to be 1.07 × 10 −11 cm 2 s −1 . Such enhanced Li surface diffusion kinetics as well as significant contribution from pseudocapacitance result in an excellent Li-ion storage performance of SnO 2 nanobelts, while the free space between the nanobelts provides morphological stability during prolonged battery cycles.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Fei Zhao,Yixin Guo,Xiang Wang,Jiahua Tao,Zeng Li,Dongliang Zheng,Jinchun Jiang,Zhigao Hu,Junhao Chu
Facile electron injection and extraction are two important attributes desired in electron transportation layer (ETL) to improve the power conversion efficiency (PCE) of planar CsPbBr 3 perovskite solar cell (PSC). Here, it is demonstrated that Li-doping of amorphous compact Nb 2 O 5 (Li: Nb 2 O 5 ) can effectively increase the electronic conductivity and facilitate the charge extraction with low recombination. Comparing with the PSC with Nb 2 O 5 ETL, the PCE of the Li: Nb 2 O 5 -based PSC is enhanced from 5.79% to 7.06%. Furthermore, the Li: Nb 2 O 5 -based CsPbBr 3 PSC exhibits a fabulous stability when exposed in air with moisture of ∼40% for 60 days. This work shows that ion doping provides new opportunities for preparing effective ETLs and high-performance inorganic PSCs .
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ELECTROCHEMISTRY
·
2020
·Vol. 88
·期 1
·8-13
·
IF 1.099
Kun WANG,Dongying JU,Guiying XU,Beibei HAN,Yongfei WANG,Jian ZHANG,Maorong CHAI,Shaobei CHEN,Weimin ZHOU
The carbon black (CB) is modified successfully by the two-step modifications such as organo-chlorination and organo-sulfuration using the chemical reagents of thionyl chloride and ethanethiol continuously. The organosulfur groups of –C–SR and –COSR forming on the CB surface play the main role to improve the electrochemical performances, which is verified by electrochemical studies. For instance, after carrying out the charge-discharge 100 times, the organosulfur modified CB (MCB) shows the Li+ ion storage capacity at 392 mAh/g, which is higher than CB showing at 176 mAh/g. Furthermore, the improvement storage capacity is attributed to the enhanced capacitive effects which are verified by the detailed measurements of cyclic voltammetry (CV). These results are able to provide effective way to enhance the storage capacity of general carbon materials such as CB, graphite, graphene oxide (GO) and so on.
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International Journal of Minerals Metallurgy and Materials
·
2026
·
IF 8.8
She Yanjun,Si Hongxiang,Li Jiaxing,Xu Wenbin,Mamlouk Mohamed,Tian Fang,Anatolyevich Mindrov K.,Wei Tao
A sulfonic-functionalized Zr-type metal–organic framework (UiO-66-SO 3 H) was synthesized, and UiO-66-SO 3 Li was obtained via subsequent lithiation treatment. The UiO-66-SO 3 H framework was incorporated into a polymer matrix as a functional filler to obtain high-performance solid composite electrolytes (SCEs). Structural and morphological analyses, as well as various electrochemical tests, were performed. Owing to well-defined porous channels, abundant lithium-ion transport sites, and effective regulation of polymer crystallinity by SO
− 3
moieties at 60°C, the optimized SCE-2 (10wt% UiO-66-SO 3 Li) exhibited a high ionic conductivity of 5.36 × 10 −4 S·cm −1 (1.86 × 10 −4 S·cm −1 at the room temperature of 25°C), along with a wide electrochemical stability window of 4.7 V and a lithium-ion transference number as high as 0.623. The Li∣SCE-2∣LiFePO 4 full cell exhibited excellent long-cycle stability at both 60°C and room temperature, as well as an excellent rate capability up to 5 C (1 C is equivalent to 170 mA·g −1 ). Moreover, SCE-2 can also be coupled with high-voltage LiNi 0.5 Co 0.1 Mn 0.3 O 2 cathodes. This study demonstrates that sulfonic-modified UiO-66-SO 3 Li can effectively regulate Li + migration, suppress lithium dendrite growth, and enhance interfacial compatibility, offering a viable approach for designing advanced solid composite electrolytes.
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Nature Communications
·
2026
·
IF 18.1
Liu Xiao,Zhang Peng,Guo Yunpeng,Xiong Chuncen,Fu Hongru,Liu Guilong,Sui Dong,Liu Xianming,Ma Lufang,Zhao Yong,Wen Liping
Elucidating the failure mechanisms of Li metal electrodes is critical to accelerating the development of long cycle life Li metal batteries. However, it has not yet fully been realized so far due to the challenges associated with quantitative and qualitative characterization of solid electrolyte interphase on metal at large-area scale. Herein, we establish a relationship between solid byproducts and dead Li amounts in solid electrolyte interphase on Li metal by using fluorescence imaging and fluorescence titration method. The success of this methodology depends on the finding of a highly selective molecular probe, dilithium 3-hydroxy-2-naphthoate, with reversible change in fluorescence wavelength and intensity toward Li metal. Accordingly, the continuous generation of solid byproducts is acknowledged as potential underlying reason towards dead Li accumulation, determining the failure of Li electrode. These findings provide insights into the understanding of failure mechanism of Li metal electrode and design of strategies to improve its cycle life.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Wenguang Wang,Chao Wang,Yanqiu Zhang,Hanyang Xu,Lu Shao
Advanced monovalent cation exchange membranes (MCEMs) have been applied to extract key monovalent cations (Li + or Na + ) from nature, but it is challenging to design high-performance MCEMs with low membrane area resistance and specific charge properties. Herein, a positively-charged Fe 3+ -bridged pyrogallic/polyethyleneimine membrane (Fe 3+ -bridged PY/PEIM) for efficient Li + /Mg 2+ separation is fabricated through a covalent bond and coordination bond (CB/COB) competitive reaction. Various physicochemical characterizations elucidate that the formation of COBs reduces the reaction sites of PY and PEI molecules for Michael-addition and Schiff-base reactions, which reduces the thickness of the selective layers to reduce the membrane area resistance from 6.58 to 4.83 Ω·cm 2 . A highly positively-charged selective layer caused by unreacted NH 2 groups and Fe 3+ makes the optimal Fe 3+ -bridged PY/PEIM exhibit a superior separation performance (perm-selectivity (Li + /Mg 2+ ) of 45.57 with a Li + flux of 4.61 × 10 −8 mol·cm −2 ·s −1 ). Moreover, the optimal Fe 3+ -bridged PY/PEIM also has excellent separation performance (high Li + flux and perm-selectivity) and operational stability when treating three simulated solutions with different Mg/Li mass ratios and salinities. The new strategy for constructing a thin, defect-free and positively-charged selective layer through a CB/COB competitive reaction can provide new insights for designing high-performance MCEMs towards environmental remediation and energy harvesting.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chenkun Li,Yao Xiao,Xiaosong Zhang,Hongwei Cheng,Ya-Jun Cheng,Yonggao Xia
The irreversible capacity loss of lithium-ion batteries during initial cycling directly leads to a decrease in energy density, and promising lithium cathode replenishment can significantly alleviate this problem. In response to the problems of complex preparation, instability in air, and unfavorable residue of the conventional cathode lithium replenishment materials, a Li2CO3/carbon nanocomposite is prepared and utilized as the lithium replenishment material. With high-speed ball-milling, a nanocomposite with a tight embedment structured Li2CO3/Ketjen Black (KB) composite composed of nanosized Li2CO3 and KB is synthesized. The decomposition potential of Li2CO3 is effectively decreased to 3.8 V, and the amount of the active lithium ion being released is significantly increased, corresponding to a specific capacity of 645.2 mAh·g–1 during the initial charging cycle. It has been introduced into the full-cells composed of the NCM523 cathode and graphite anode, resulting in a capacity increase of 44 mAh·g–1 in the initial cycle and a 26.4% improvement in capacity retention over 100 cycles. The working mechanism of the Li2CO3/KB nanocomposite as the lithium replenishment agent has been discussed. The outcome of the work provides a practically feasible route to realize lithium-ion battery technology with improved energy density and cycling life.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 13
·2101955
·
IF 6.389
Anping Tang,Ziqin Liang,Hezhang Chen,Guorong Xu,Haishen Song
A new type of cathodic active material for lithium-ion batteries based on a composite of Li 3 PO 4 and V 2 O 3 is proposed in this work. Although the V 2 O 3 component is almost inactive in the voltage range of 2–4.5 V versus Li + /Li, the mixture of the two components can deliver a larger reversible specific capacity of ≈190 mA h g −1 in the voltage range of 2–4.5 V at a current density of 15 mA g −1 . X-ray photoelectron spectroscopy data and cyclic voltammetry data suggest that the vanadium ions are probably oxidized and reduced repetitively upon cycling and that the V 3+ ions are partially oxidized to V 4+ and even V 5+ ions during charging to 4.5 V. This distinctive lithium-ion uptake and release phenomenon, in which Li 3 PO 4 functions as a lithium source of surface conversion reaction, will introduce a new path for designing unique cathodic active materials for lithium-ion batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Wenhui Zhu,Ali Reza Kamali
Thermal oxidation in air of molybdenum disulfide (MoS 2 ) into layer structured molybdenum trioxide (α-MoO 3 ) is investigated using a combination of thermal analysis, electron microscopy , Raman, X-ray diffraction and photoelectron spectroscopy . The phase evolutions occurred during the thermal process is characterized by the surface oxidation of MoS 2 , followed by the bulk oxidation to form α-MoO 3 and the formation of Mo 17 O 47 at higher temperatures. The single-phase MoO 3 formed at optimum temperature condition is found to possess crystalline defects and considerably greater values of Li-ion storage cycling and rate performances in comparison with samples prepared at alternative temperatures and also the initial MoS 2 . This sample (P-MoO 3 -820) exhibits a charge capacity of 628 mA h g −1 after 250 cycles (100 mA g −1 ) with a Li + diffusion coefficient of 2.3 × 10 -13 cm 2 s −1 , substantially greater than that of initial MoS 2 (8.1 × 10 −16 cm 2 s −1 ). The electrochemical performance of P-MoO 3 -820 in full-cell configuration against a commercial LiFePO 4 cathode is evaluated and a specific capacity of 100 mAh g −1 after 500 cycles is recorded. This article, for the first time, discusses the thermal oxidation in air of MoS 2 as a simple and relatively clean approach to fabricate defective crystalline MoO 3 with enhanced Li-ion storage kinetics.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bing Xue,Xiangkun Wu
The high energy density cathode material , nickel-rich layered oxide LiNi 0.8 Co 0.1 Mn 0.1 O 2 (LNCM), has been extensively researched for its potential applications. Nevertheless, its structural instability, weak conductivity and unsafe properties greatly impede its further development. To address these issues, the method of surface coating by graphene and element doping by Mg atom for LNCM is proposed, and its structural and electrochemical properties , as well as the promoting mechanism are comprehensively studied. Such as, the structural and morphological features are investigated by X– ray diffraction (XRD), Raman spectroscopy , thermogravimetric analysis (TGA), scanning electron microscopy (SEM) coupled with energy dispersive X – ray spectroscopy (EDX) and transmission electron microscopy (TEM). Characterization techniques depict the composites’ dimension, modified construction and components. Electrochemical performances are studied using cyclic voltammetry , electrochemical impedance spectroscopy , and galvanostatic charge – discharge test. The typical redox peaks of Ni 2+ /Ni 4+ and Co 3+ /Co 4+ are well-defined for LNCM@rGM, and its improved electrochemical performance compared to LNCM are demonstrated. Specifically, LNCM@rGM exhibits a higher capacity retention of 58%, maintaining a capacity of 123.3 mAh g −1 after the 200th cycle, from an initial value of 211.0 mAh g −1 . Additionally, LNCM@rGM shows a higher rate capability of 80.2 mAh g −1 at 5 C, as well as improved Li + diffusion and higher exchange current density. The findings indicate that the composite structure consisting of graphene coating and element doping shows improved electrochemical performance when exposed to an optimal heating temperature, resulting in enhanced structural stability, elevated ionic/electronic conductivity, and synergistic effects on the materials.
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