ACS Applied Materials & Interfaces
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2015
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IF 6.723
Chao-Ying Fan,Pin Xiao,Huan-Huan Li,Hai-Feng Wang,Lin-Lin Zhang,Hai-Zhu Sun,Xing-Long Wu,Hai-Ming Xie,Jing-Ping Zhang
In this work, the chemical interaction of cathode and lithium polysulfides (LiPSs), which is a more targeted approach for completely preventing the shuttle of LiPSs in lithium–sulfur (Li–S) batteries, has been established on the electrode level. Through simply posttreating the ordinary sulfur cathode in atmospheric environment just for several minutes, the Au nanoparticles (Au NPs) were well-decorated on/in the surface and pores of the electrode composed of commercial acetylene black (CB) and sulfur powder. The Au NPs can covalently stabilize the sulfur/LiPSs, which is advantageous for restricting the shuttle effect. Moreover, the LiPSs reservoirs of Au NPs with high conductivity can significantly control the deposition of the trapped LiPSs, contributing to the uniform distribution of sulfur species upon charging/discharging. The slight modification of the cathode with <3 wt % Au NPs has favorably prospered the cycle capacity and stability of Li–S batteries. Moreover, this cathode exhibited an excellent anti-self-discharge ability. The slight decoration for the ordinary electrode, which can be easily accessed in the industrial process, provides a facile strategy for improving the performance of commercial carbon-based Li–S batteries toward practical application.
研究领域:
储能技术
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纳米材料
·
电化学
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电池技术
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 5
·2233-2245
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IF 11.9
Ke Tan,Zhaolin Tan,Sen Liu,Guoqiang Zhao,Yang Liu,Linrui Hou,Changzhou Yuan
Li–S batteries (LSBs), owing to their superior energy density, cost-efficiency, and environment-friendliness, are established as one of the most potential next-generation electrochemical energy storage systems. However, the shuttle effect of lithium polysulfides (LPSs) and the poor conductivity of active substances are the main challenges to their practical applications. Herein, we propose a synergistic strategy involving heterogeneous and homogeneous catalysts. First, MIL-47 as-derived core–shell carbon nanorods decorated with a V3S4 nanosheet shell (V3S4@C) were smartly constructed and applied as the host material for sulfur cathodes. The resulting V3S4@C not only enhanced the electronic conductivity of the integrated cathode but promoted LPSs chemisorption and conversion as heterogeneous catalysts. The optimized Co(C5H5)2 was further introduced into the electrolyte as a homogeneous catalyst, improving the conversion efficiency of LPSs and electrolyte wettability. Benefiting from the synergistic contributions of the V3S4@C host and the homogeneous catalyst Co(C5H5)2, the assembled LSBs with S/V3S4@C as the cathode exhibited outstanding long-life cycling performance and high-rate behavior, particularly in cases with high sulfur loading and low electrolyte dosage. More significantly, our work promises a feasible pathway for commercial applications of advanced LSBs.
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高影响因子
Journal of Energy Chemistry
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2022
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IF 13.599
Dongdong Li,Jinbiao Chen,Yingtong Chen,Yian Wang,Yanpeng Fu,Minhua Shao,Zhicong Shi
Rechargeable aprotic Li-O 2 batteries have attracted increasing attention due to their extremely high capacity, and it is very important to design appropriate strategies to synthesize efficient catalysts used as oxygen cathode. In present work, we present an expedient “instantaneous nucleation and epitaxial growth” (INEG) synthesis strategy for convenient and large-scale synthesis of ultrafine MOCPs nanoparticles (size 50–100 nm) with obvious advantages such as fast synthesis, high yields, low costs and reduced synthetic steps. The bimetallic Ru/Co-MOCPs are further pyrolyzed to obtain bimetallic Co– and low content of Ru-based nanoparticles embedded within nitrogen-doped carbon (Ru/Co@N C) as an efficient catalyst used in Li-O 2 battery. The Ru/Co@N C provides porous carbon framework for the ion transportation and O 2 diffusion, and has large amounts of metal/nonmetal sites as active site to promote the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) in Li-O 2 batteries. As a consequence, a high discharge specific capacity of 15246 mA h g −1 at 250 mA g −1 , excellent rate capability at different current densities, and stable overpotential during cycling, are achieved. This work opened up a new understanding for the industrialized synthesis of ultrafine catalysts for Li-O 2 batteries with excellent structural characteristics and electrochemical performance.
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高影响因子
Journal of Materials Research and Technology-JMR&T
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2022
·
IF 6.267
Ruixiang Wang,Yanyang Wang,Yanhua Lu,Jiangfeng Zheng,Caini Zhong,Jiaming Liu,Jianjun Liu,Shubiao Xia
Constructing advanced nanostructures and combining various active materials are effective strategies to obtain high-performance anode materials for lithium-ion batteries (LIBs). Herein, we report a surface-coordinated polymerization method to synthesize ZIF-67 nanoparticles with a reuleaux tetrahedron morphology, and combine the electrostatic adsorption method and heat treatment, nitrogen-doped hollow porous Co 3 O 4 (HP-Co 3 O 4 /NC) nanoparticles were anchored on reduced graphene oxide (rGO) to obtain HP-Co 3 O 4 /NC@rGO composites. This deliberate structural design can significantly improve the electrochemical performance of lithium (Li) storage. When applied as an anode material in LIBs, HP-Co 3 O 4 /NC@rGO nanocomposite renders a reversible capacity of 809 mAh g −1 after 200 charge/discharge cycles at a current density of 1000 mA g −1 . The excellent electrochemical performance is mainly attributed to the synergistic effect of the hollow nanostructure and graphene network. A hollow nanostructure can provide abundant active sites and enhance structural stability. As a conductive network, graphene tightly wraps Co 3 O 4 , which can not only increase the electronic and ionic transport but also alleviates the volumetric changes of Co 3 O 4 during the charge/discharge process, thereby improving the rate performance and cyclic stability.
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高影响因子
Carbon Energy
·
2023
·Vol. 5
·期 8
·e334
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IF 20.5
Meiling Wang,Ying Yao,Feiyang Yang,Zhenwu Tang,Jingjie Ren,Cunzhong Zhang,Feng Wu,Xiangke Wang
The rational design of large-area exposure, nonagglomeration, and long-range dispersion of metal nanoparticles (NPs) in the catalysts is critical for the development of energy storage and conversion systems. Little attention has been focused on modulating and developing catalyst interface contact engineering between a carbon substrate and dispersed metal. Here, a highly dispersed ultrafine ruthenium (Ru) NP strategy by double spatial confinement is proposed, that is, incorporating directed growth of metal–organic framework crystals into a bacterial cellulose templating substrate to integrate their respective merits as an excellent electrocatalytic cathode catalyst for a quasi-solid-state Li–O 2 battery. The porous carbon matrix with highly dispersed ultrafine Ru NPs is well designed and used as cathode catalysts in a Li–O 2 battery, demonstrating a high discharge areal capacity of 6.82 mAh cm –2 at 0.02 mA cm –2 , a high-rate capability of 4.93 mAh cm –2 at 0.2 mA cm –2 , and stable discharge/charge cycling for up to 500 cycles (2000 h) with low overpotentials of ~1.4 V. This fundamental understanding of the structure–performance relationship demonstrates a new and promising approach to optimize highly efficient cathode catalysts for solid-state Li–O 2 batteries.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Xinran Hu,Helong Jiang,Xiangcun Li,Jiawei Mu,Gaohong He,Miao Yu
Li–S batteries still have various problems, including volume expansion, low S conductivity, and shuttling effect of polysulfides (LiPSs), requiring resolution. Herein, polyvinylidene fluoride (PVDF) is combined with carbon nanotubes (CNTs) and Fe2O3 through a one-step phase-inversion process to form a highly flexible and conductive membrane as a functional Li–S battery interlayer. The CNT skeleton is tightly entangled and crosslinked by PVDF to form a hierarchically porous framework, which is suitable for fast Li+ and electron transport and volumetric expansion of S and facilitated electrolyte diffusion. Additionally, the strongly negative F atoms can accelerate Li+ transport, promoting the fast redox reaction between S species and Li+. Furthermore, the uniformly doped Fe2O3 nanoparticles provide abundant active sites and broad reaction interfaces for highly efficient LiPS anchoring and catalytic conversion. Li–S batteries with the membrane as the interlayer exhibit an excellent cycle performance and reversible capacity of 631.2 mAh g–1 after 400 cycles at 1 C. Furthermore, in situ Raman spectroscopy shows that long-chain Li2S8 decreases, indicating that the interlayer can alleviate the shuttle of soluble LiPSs. This proposed strategy advances the practical application of Li–S batteries due to the facile and scalable production of the flexible membrane.
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高影响因子
Journal of Materials Chemistry A
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2022
·Vol. 10
·期 45
·24258-24268
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IF 14.511
Shuo Wang,Haiting Shi,Yuanhua Xia,Dong Liu,Chunying Min,Ming Zeng,Sirui Liang,Ruiqi Shao,Xiaoqing Wu,Zhiwei Xu
A bottleneck limiting the practical application of lithium metal anodes is the uncontrolled growth of lithium dendrites caused by gradient distributed Li+ from separators to collectors. Herein, 3D-printed frameworks with a gradient distributed heterojunction and fast Li+ conductivity interfaces are developed to regulate the Li+ distribution and the direction of dendrite growth. More importantly, the effect of different Li+ concentration gradient frameworks on Li+ deposition behavior was analyzed in detail. Synchrotron X-ray tomography demonstrates that macropores dominate the framework, which effectively suppresses the volume change caused by lithium deposition. DFT calculations confirm the high lithiophilicity of γ-Al2O3 and the graphene heterojunction. Synchrotron radiation-based soft X-ray absorption spectroscopy illustrates the fast Li+ conductivity Li–Al–O interface resulting from the shortened Al–O bond distance. Benefiting from the higher Li+ concentration differences during the dissolution process and Li–Al–O interfaces, the gradient framework can achieve a high rate performance of ∼40 mV overpotential at 10 mA cm−2 and long cycle stability of ∼1500 h at 1 mA cm−2.
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高影响因子
ACS Materials Letters
·
2022
·
IF 11.17
Jiawei Mu,Miao Yu,Helong Jiang,Xiangcun Li,Fangyi Chu,Qiao Hou,Gaohong He
The uncontrollable formation of Li dendrites and the problems arising from it are the major obstacles in the practical application of Li metal batteries. Thereby, it is crucial to induce the uniform dispersion and deposition of Li+. To realize it, we constructed a flexible membrane electrode that facilitated Li+ dispersion by the interwoven conductive porous skeleton and simultaneously promoted Li+ deposition with doped active sites. The skeleton was composed of CNTs cross-linked with polyvinylidene fluoride (PVDF), which ensured the good conductivity and flexibility of membrane, and the −CF2 groups on PVDF chains also accelerated the migration of Li+. The doped Fe2O3 with strong lithiophilicity played a vital role in Li+ deposition. Quasi in situ X-ray photoelectron spectroscopy and in situ X-ray diffraction measurements were employed to reveal the reaction mechanism that Fe2O3 could be partially reduced by Li+ forming LixFe alloy, and reoxidized to amorphous Fe2O3. According to the galvanostatic current test of symmetric battery, the voltage had no significant changed after 1500 h, which proved that multifunctional membrane electrode effectively reduced the effect of Li dendrites. The assembled coin battery delivered an initial capacity of 125.9 mA h g–1 and still maintained at 114.9 mA h g–1 after 200 cycles at 0.5 C, with a capacity decay rate of only 0.048% per cycle. The pouch cell also exhibited excellent cycling stability with a Coulombic efficiency of >99.2% after 70 cycles at 0.5 C. This work provides a novel flexible membrane electrode design in solving the Li dendrites and developing novel electrodes for Li metal batteries.
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高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 6
·1775-1785
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IF 7
Chuyue Cai,Liping Wu,Zhiwei Cai,Fang Yu,Liu Zhang,Liya Wang,Tao Mei,Liangyou Lin,Xianbao Wang
Lithium–sulfur batteries (LSBs) are broadly considered to be the most promising next-generation energy storage because of their ultrahigh theoretical energy density and cost-effectiveness. However, the “shuttle effect” and sluggish conversion kinetics of polysulfides severely hinder their practical application. To address these challenges, a unique Co-doped MnO2 nanorod network layer with oxygen vacancies (Co-MnOx) was devised by self-assembly on a commercial separator through the chemical growth method for high-performance LSBs. The Co-MnOx modified separators (Co-MnOx@PP) not only effectively alleviate the “shuttle effects” but also accelerate the redox conversion of polysulfides. More importantly, the Co-MnOx@PP demonstrated superior thermostability and flame-retardant properties owing to the chemical growth method. The LSBs with Co-MnOx@PP separators exhibited a high reversible capacity of 902.0 mA h g−1 and 562.2 mA h g−1 at 0.5 C for 20 °C and 60 °C after 200 cycles, respectively. Even at 3 C, after 500 cycles, a superb cycling performance of 715.2 mA h g−1 with an ultra-low decay of 0.069% for each cycle was achieved. Therefore, this proposed strategy of a Co-doped MnO2 nanorod network layer with oxygen vacancies will provide a new route for rationally devising durable and efficient LSBs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Ai-Long Chen,Mingyu Gao,Lulu Mo,Jing Wang,Zhen Xu,Yue-E Miao,Tianxi Liu
Lithium (Li) metal is considered as the best anode candidate for next-generation high-energy batteries due to its ultralow electrochemical potential and extremely high theoretical capacity. However, issues arising from the undesired growth of lithium dendrites and infinite volumetric change have seriously hindered the practical application of lithium metal batteries (LMBs). Here, we designed a super-lithiophilic amorphous zinc oxide-doped carbon nanofiber framework with uniformly-distributed and parallel multichannels (MCCNF@ZnO) to achieve the homogeneous distribution of electric field and Li + flux. By the assistances of COMSOL Multiphysics simulations and ex-situ scanning electron microscopy, we reveal that the Li metal preferentially deposits into the porous nanochannels inside the nanofibers, followed by its even distribution on the lithiophilic surface of MCCNF@ZnO. Furthermore, the conductive multichannels of the carbon nanofiber skeleton can effectively minimize the partial current density, thereby effectively avoiding the electrochemical polarization and assisting the uniform metallic deposition. As a result, MCCNF@ZnO exhibits a stable CE over 99.2% as the substrate after 500 cycles at the current density of 1 mA cm −2 . The symmetrical cell of lithium-loaded MCCNF@ZnO composite electrodes can stably operate over 3300 h at 0.5 mA cm −2 , indicating the great potential of MCCNF@ZnO for stabilizing lithium metal anodes in practical applications of LMBs.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yue Yin,Xian Luo,Benjun Xu
Li 4 Ti 5 O 12 (LTO) is the most promising anode material for lithium-ion batteries owing to its excellent cycle stability and safety. However, the electrochemical performance of LTO at high rates is limited by its low conductivity. Generally, LTO preparation requires organic titanium sources, which are expensive. In this study, inexpensive H 2 TiO 3 was used as the titanium source, LiOH‧H 2 O served as the lithium source, and NH 3 ‧H 2 O was added to control the pH of the solution. Simple one-step liquid-phase deposition and calcination were performed for obtaining in situ self-assembled LTO submicron spheres with stable morphology and excellent electrochemical performance. According to electrochemical performance tests, the sample calcined with 4 mL of 25% NH 3 ‧H 2 O at 700 °C (LTO-4–700) exhibited the best performance. Its discharge capacity remained at 176.4 mAh g −1 over 100 cycles at 87.5 mA g −1 and retained at 136.7 mAh g −1 over 500 cycles at 875 mA g −1 , and its specific capacity was 105.6 mAh g −1 over 1000 cycles, even at a current of 1750 mA g −1 with a retention rate of 96.7%. Furthermore, LTO-4–700 exhibited excellent rate performance at 3500 mA g −1 compared to other samples. Cyclic voltammetry and electrochemical impedance spectroscopy confirmed that submicron spherical LTO-4–700 had a high Li + migration rate and low electrochemical impedance.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Xinbin Wu,Wei Yu,Wei Xu,Yujun Zhang,Shundong Guan,Zheng Zhang,Shuwei Li,Huanchun Wang,Xuanjun Wang,Liang Zhang,Ce-Wen Nan,Liangliang Li
Lithium-oxygen (Li–O 2 ) batteries are promising next-generation energy storage devices due to their ultrahigh theoretical specific energy. Oxide electrocatalysts such as RuO 2 are often used to improve the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) processes in Li–O 2 batteries, but the relation between the structural parameters and their catalytic properties is unclear so far. In this work, we synthesize RuO 2 nanoparticles at different annealing temperatures and investigate the influence of the Ru–O bond distances of RuO 2 on the OER and ORR processes in Li–O 2 batteries. The results of X-ray absorption fine structure show that the bond distances decrease with the increase of the annealing temperature. The RuO 2 with longer Ru–O bond distances renders a lower charge plateau to Li–O 2 batteries, showing a better OER performance, while that with shorter bond distances gives a larger discharge capacity and is more friendly to the ORR process. The cycle life of Li–O 2 batteries with a carbon nanotube-RuO 2 composite cathode is improved to 287 cycles (1148 h) under an extreme testing condition (the voltage range is 2.3–4.2 V), when the Ru–O bond distances are optimized. In addition, the influence of the Ru–O bond distances on the catalytic properties of RuO 2 is analyzed by density functional theory calculations. The findings in this work provide a guidance to enhance the ORR and OER efficiency of RuO 2 and other oxide catalysts.
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高影响因子
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