APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Nan Wang,Linhao Sun,Xuecheng Cao,Jialin Fu,Shuo Qi,Lingling Tang,Dangsheng Xiong
Li–air batteries with ultrahigh energy density are attracting attention, but at present, their practical applications are severely limited by water intrusion in the air. Herein, we loaded PtCo alloy nanoparticles on a N-doped porous carbon surface to create a novel hydrophobic functional catalyst. This catalyst effectively inhibited water contamination and suppressed the occurrence of side reactions. Li–air batteries with hydrophobic functional catalysts exhibited over double the cycle performance in both humid oxygen (∼50% relative humidity, over 255 h) and ambient air (CO 2 : 700 ppm, ∼55% relative humidity, over 135 h) at a current density of 500 mA g -1 . In addition, the discharge specific capacities of humid oxygen and ambient air were increased to 18719.3 mAh g -1 and 11,385 mAh g -1 .
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Frontiers in Chemistry
·
2023
·
IF 5.5
Liping Zhao,Ye Zhao,Lihe Zhao,Gang Liu
A nitrogen–sulfur dual-doped black fungus porous carbon (NS-FPC) matrix was prepared with natural black fungus as the carbon source and cysteine as the nitrogen–sulfur source. A black fungus-based solution was obtained by hydrothermal treatment. After further carbonization activation and combination with sulfur processing, the NS-FPC/S positive electrode materials were prepared. The uniform recombination of biomass carbon provides an efficient conductive framework for sulfur. The porous structure is conducive to the transport of electrolytes. Heteroatom doping can provide a more active site. The structure and composition analyses of the materials were carried out using X-ray diffraction (XRD). The electronic binding energy and bonding state were analyzed by X-ray photoelectron spectroscopy (XPS). The morphology was observed by scanning electron microscopy and transmission electron microscopy. The specific surface area and pore size distribution were analyzed using an N 2 adsorption–desorption experiment. Sulfur loading was determined through thermogravimetric analysis. The electrochemical performance of NS-FPC/S in Li–S batteries was systematically investigated. The result shows that the NS-FPC/S electrode maintains more than 1,000 mAh g -1 reversible capacity after 100 cycles at 0.2 C current density, with a capacity retention of 85%. The cycle and rate performance are both considerably superior to those of traditional activated carbon materials.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Zhenpu Shi,Juhong Xu,Yujiao Wang,Yudong Pang,Wanli Zhao,Hongyun Yue,Zongxian Yang,Shu-Ting Yang,Yanhong Yin
Lithium polysulfides (LiPSs) shuttling effect is the main problem to be solved for cathode materials of lithium–sulfur batteries. The adsorption and catalytic conversion of LiPSs by host materials have become the main focus of cathode materials. In this work, transition metal phosphides are combined with three-dimensional carbon nanosheets to form an efficient and stable sulfur host material. The designed composite material is effective in solving the problems of slow reaction kinetics of Li–S batteries and LiPSs shuttling. Here, through the supramolecular self-assembly process of melamine and phytic acid, combined with soluble salt template technology, N- and P-codoped three-dimensional hierarchical porous carbon materials with uniformly dispersed CoP nanoparticles were efficiently synthesized. The catalytic effect of CoP nanoparticles improves the reaction kinetics effectively of LiPS conversion. The strong polarity of CoP nanoparticles is beneficial to the adsorption of polysulfide ions. Moreover, the high specific area provides more LiPS adsorption sites, and the doping of N and P heteroatoms further increases the active sites of the composites. The experimental results and theoretical calculations show that the introduction of CoP promotes the conversion of LiPSs and accelerates the nucleation rate of Li2S, thereby improving the electrochemical performance of the composite as a sulfur host for lithium–sulfur batteries.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Ying Zhang,Yujie Luo,Shiqi Fu,Xiulong Lv,Qian He,Fangying Ji,Xuan Xu
UVC (wavelength < 280 nm) has a wide range of applications in the field of water disinfection due to its excellent bactericidal performance. In this work, we synthesized an upconversion luminescent material, β-NaYF 4 : Pr 3+ , Li + (NYF), which can generate UVC, and compounded it with a BiOCl photocatalyst to synthesize β-NaYF 4 : Pr 3+ , Li + @BiOCl (NYF-Bi) with a core-shell structure. The NYF-Bi composite material can be driven under visible light and has high photocatalytic activity . The bactericidal performance of NYF and NYF-Bi were evaluated using Escherichia coli , Staphylococcus aureus , Shigella and Salmonella . The NYF-Bi composite material killed 99.99% of E. coli under visible light (λ ≥ 420 nm) within 180 min and maintained high germicidal efficacy after 4 cycles. Finally, we deduced the sterilization mechanism of the NYF-Bi composite material through carrier dynamics studies and catching agent experiments. The death of bacteria was mainly caused by UVC light and active species , including h + , OH, and O- 2. This research provides a new material for water disinfection.
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ChemSusChem
·
2021
·Vol. 14
·期 9
·2067-2075
·
IF 8.928
Sen Jiang,Haihua Wu,Junying Yin,Zhihua Wei,Jiahao Wu,Lai Wei,Dunfeng Gao,Xin Xu,Yunfang Gao
Graphical Enhanced electrolyte : Ultralow-cost benzoic anhydride (BA), as a promising bifunctional electrolyte additive to capture hydrogen fluoride and H 2 O as well as to construct a robust cathode-electrolyte interface on the LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathode surface, effectively improves the cycling performance and rate capability of high-voltage Li-ion batteries with LiPF 6 -based electrolyte. High-voltage LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811)-based Li-ion batteries (LIBs) with enhanced performance can be achieved by properly tailoring the electrolyte systems. Benzoic anhydride (BA) was proposed here as a promising bifunctional electrolyte additive that can not only construct a robust cathode-electrolyte interface (CEI) film on the electrode surface but also capture HF/H 2 O in the electrolyte effectively. Compared to the cell without the BA additive, the capacity of Li/NCM811 half-cell with 1.0 wt % BA was increased from 128.5 to 149.6 mAh g −1 after 200 cycles at 1 C between 3.0 and 4.3 V. Even at a higher cut-off voltage of 4.5 V, the BA-containing Li/NCM811 half-cell delivered a capacity retention of 69 % after 200 cycles, much higher than that of the half-cell without the additive (56 %). Both theoretical calculation and experimental results verified that the BA additive could be preferentially oxidized to form a stable interface film with high conductivity that protected the NCM811 cathode and suppressed the decomposition of the electrolyte.
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Nanomaterials
·
2020
·Vol. 10
·期 9
·1629
·
IF 4.324
Ranran Jiao,Li Zhao,Shuli Zhou,Yanjun Zhai,Denghu Wei,Suyuan Zeng,Xianxi Zhang
In this study, a simple method was adopted for the synthesis of MnO@C nanocomposites by combining in-situ reduction and carbonization of the Mn3O4precursor. The carbon content, which was controlled by altering the annealing time in the C2H2/Ar atmosphere, was proved to have great influences on the electrochemical performances of the samples. The relationships between the carbon contents and electrochemical performances of the samples were systematically investigated using the cyclic voltammetry (CV) as well as the electrochemical impedance spectroscopy (EIS) method. The results clearly indicated that the carbon content could influence the electrochemical performances of the samples by altering the Li+diffusion rate, electrical conductivity, polarization, and the electrochemical mechanism. When being used as the anode materials in lithium-ion batteries, the capacity retention rate of the resulting MnO@C after 300 cycles could reach 94% (593 mAh g−1, the specific energy of 182 mWh g−1) under a current density of 1.0 A g−1(1.32 C charge/discharge rate). Meanwhile, this method could be easily scaled up, making the rational design and large-scale application of MnO@C possible.Keywords:MnO@C nanocomposites;carbon content;current density;lithium-ion battery;transition metal oxide anode
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WASTE MANAGEMENT
·
2020
·
IF 5.448
Jai Kumar,Xing Shen,Bo Li,Huizhou Liu,Junmei Zhao
To recycle the sharply growing spent lithium-ion batteries and alleviate concerns over shortages of resources, particularly Li, is still an urgent issue. In this work, an organic acids based leaching approach at room temperature is proposed to recover Li and FePO 4 from spent LiFePO 4 cathode powder. The coexistent metal ions, Cu and Al, have also been investigated. Citrus fruit juices, rich in organic acids, such as citric acid and malic acid, have been used as leaching agents in this work. Among lemon, orange and apple, lemon juice shows the best leaching effect based on its suitable pH of the reaction system. Under the optimized conditions, the leaching rates of Li, Cu and Al can reach up to 94.83%, 96.92% and 47.24%, while Fe and P remain as low as 4.05% and 0.84%, respectively. Li 2 CO 3 and FePO 4 can be recovered from the leachate and the leaching residue, respectively. The recovered FePO 4 was used to prepare new cathode material LiFePO 4 . The crystalline carbon, present in the spent LiFePO 4 cathode scraps, has a significant effect on the electrochemical performances of the regenerated LiFePO 4 . The regenerated LiFePO 4 cathode material delivered a comparable discharge capacity of 155.3 mAh g −1 at 0.1C and rate capacity to the fresh LiFePO 4 . For the cycling stability, it displays capacity retention of 98.30% over 100 cycles at 1 C with a fading rate of 0.017% per cycle. The proposed organic acids-based recycling strategy is much benign for recycling the spent LiFePO 4 cathode materials.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yongqing Ren,Hao Li,Jinxin Liu,Mengdie Zhou,Jianming Pan
Self-propelled micromotor (SPM) plays a vital role in recycling of lithium (Li + ) from wastewater in battery industry. In this work, a crescent-shaped micromotor sorbent (CSMSs) with sulfonic group on convex surface was prepared by Janus emulsion to extract Li + . Using sodium p-styrene sulfonate as a functional monomer , well-designed CSMSs was prepared by UV-induced monomer interfacial polymerization, and their pit size can be controlled by adjusting the ratio of two incompatible oils (ethoxylated trimethylolpropane triacrylate and liquid paraffin). In addition, MnO 2 nanoparticles , which embedded into concave interface, generated O 2 bubbles in the presence of H 2 O 2 , and constant circular or line motion of CSMSs was observed. Zeta potential of CSMSs was −51.66 eV at pH = 10, and strong electrostatic attraction between sulfonate groups and Li + endowed the maximum monolayer adsorption capacity of 31 mg g −1 at 25 °C. Self-propelled effect further enhanced kinetic performance for Li + , and equilibrium time can be reduced from original 10–6.0 h, suggesting autonomous movement achieves rapid mixing and mass transportation. After three adsorption/desorption cycles, the adsorption capacity of the material remains above 90%. This simple and large-scale preparation strategy provided a synthetic method for functional and Janus SPM, as well as sorbents for Li + enrichment.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xiang Ji,Xinyi Dai,Fuzhong Wu,Yi Mai,Haijun Chen,Yijing Gu
LiNi 0.5 Mn 1.5 O 4 (LNMO) is a promising next-generation cathode material for high energy density lithium-ion batteries, but the application of LNMO is blocked because of its inherent side effects with electrolytes at high voltages, namely, serious Mn dissolution and capacity attenuation. A novel LiNi 0.5 Mn 1.5-x Sr x O 4 material (x = 0, 0.05, 0.1, 0.15, and 0.2) was successfully prepared using the sol-gel method, and the effect of varying in situ Sr 2+ -doping on the crystal structure, morphology, and electrochemical performance was researched. A series of characterizations showed that the Sr-doped LNMO structure contains less Mn 3+ , which enhances its cycling stability. In addition, Sr doping promotes morphological changes more remarkably. Accompanied by the appearance of (100) surfaces, the morphology of LNMO changes from an octahedron to a truncated octahedron. The (100) surface can effectively inhibit side reactions with the electrolyte and steady the structure at the working voltage, which also helps support Li + transport kinetics. The Sr-doped LiNi 0.5 Mn 1.4 Sr 0.1 O 4 (expressed as LNMO-Sr0.1) cathode exhibits preeminent cycling stability, after 500 cycles at 1C, the capacity retention is 86.63 %. CV and EIS results show that the right amount of Sr doping efficiently reduces electrode polarization and charge transfer resistance and increases the Li + diffusion coefficient .
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Tingting Li,Ruisong Guo,Yani Luo,Fuyun Li,Zhichao Liu,Leichao Meng,Zhiwei Yang,Honglin Luo,Yizao Wan
By skillfully designing the double-sided protective structure, WS 2 nanosheets in situ grow on reduced graphene oxide hollow spheres (Hs-rGO). Then nitrogen doped graphene (NG) is coated on the outer layer to obtained NG@WS 2 @Hs-rGO. Double-sided protective structure of NG@WS 2 @Hs-rGO is successfully fabricated via a facile synthesis strategy. When evaluated as an anode material for Lithium-ion batteries (LIBs), NG@WS 2 @Hs-rGO exhibits a high specific capacity of 1309.4 mAh g −1 at 100 mA g −1 and excellent rate capability (166.1 mAh g −1 at a high current density of 4000 mA g −1 ). More strikingly, at a high current density of 1000 mA g −1 , the NG@WS 2 @Hs-rGO electrode delivers a discharge capacity of 300.9 mAh g −1 after 320 cycles. The capacity retention of the electrode material reaches as high as 106% of the discharge capacity after the 10th cycle. Internally, the elastic Hs-rGO provides space for the bulk expansion of WS 2 . Externally, the outer layer of WS 2 coated with NG not only improves the conductivity, but also provides more active sites for Li ion storage. The double-sided protective structure makes NG@WS 2 @Hs-rGO a potential anode material for light and high-performance LIBs.
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ACS Applied Nano Materials
·
2018
·
IF 0
Kai Yang,Lei Zhong,Jiaxiang Qin,Junchen Liu,Min Xiao,Dongmei Han,Shan Ren,Luyi Sun,Shuanjin Wang,Yuezhong Meng
The high theoretical specific capacity of lithium–sulfur battery is regarded as a promising candidate for next-generation battery systems. However, “polysulfide shuttle” is known as a major issue of accelerating capacity fading and corroding the metal lithium anode, which impedes its commercial application. Here, a nitrogen–sulfur codoped two-dimensional carbon material is synthesized using a novel template method by pyrolyzing chemical adsorption of montmorillonite and methylene blue. The microstructure and morphologies of the synthesized two-dimensional carbon materials are fully characterized using SEM, TEM, XRD, and Raman techniques. The experiment results indicate that the carbon material shows a typical graphene structure. The micro/mesoporous and heteroatoms codoped structure of the synthesized carbon material exhibits excellent performance in electronic conductivity and polysulfides confinement. The functional separator laminated with the binder-free carbon material endows the battery outstanding electrochemical and rate performances. The excellent rate performance is discovered a capacity of 828 mAh g–1 at 4 C with good reversibility. The battery presents a high initial discharge specific capacity of 1049 mAh g–1 with good capacity retention of 690 mAh g–1 after 500 cycles at 1 C. Consequently, the separator laminated with the nitrogen–sulfur codoped graphene is promising for the construction of high performance Li–S batteries.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ming Luo,Xiao Yu,Wenxia Zhao,Ruimei Xu,Yong Liu,Hui Shen
Extensive efforts have been devoted to developing simple, low-cost, and high-production-yield methods to prepare hybrid materials with desired structural features for high-performance lithium storage. Here, a novel strategy is reported for fabricating the porous TiO2 nanofibers decorated with N-doped carbon (TiO2/C nanofibers) by a combination of mechanical stirring and the addition of a polymer in a beaker at ambient temperature, followed by calcination. The mechanical stirring process can provide homogeneous mixing of reactants in a solution, whereas the polymer acts not only as a structure-directing agent for fabricating one-dimensional nanofibers but also as the carbon and nitrogen source to generate N-doped carbon framework and porous structures. The TiO2/C nanofibers have average diameters of 500 nm and lengths up to 65 μm and are further composed of intercrossed TiO2 nanocrystals with sizes of 8 nm, with micropores centered at 1.5 nm and mesopores at 3–6 nm. The TiO2/C electrodes demonstrated a high reversible capacity (368 mAh g–1 at 0.25C after 200 cycles), good cycling performance (176 mAh g–1 at 10C over 2000 cycles), and excellent rate capability (97 mAh g–1 at 20C).
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危险品化学品经营许可证（带存储）