Materials
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2021
·Vol. 14
·期 16
·4751
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IF 3.623
Lian-Bang Wang,He-Shan Hu,Wei Lin,Qing-Hong Xu,Jia-Dong Gong,Wen-Kui Chai,Chao-Qi Shen
Lithium-rich manganese oxide is a promising candidate for the next-generation cathode material of lithium-ion batteries because of its low cost and high specific capacity. Herein, a series of xLi2MnO3·(1 − x)LiMnO2nanocomposites were designed via an ingenious one-step dynamic hydrothermal route. A high concentration of alkaline solution, intense hydrothermal conditions, and stirring were used to obtain nanoparticles with a large surface area and uniform dispersity. The experimental results demonstrate that 0.072Li2MnO3·0.928LiMnO2nanoparticles exhibit a desirable electrochemical performance and deliver a high capacity of 196.4 mAh g−1at 0.1 C. This capacity was maintained at 190.5 mAh g−1with a retention rate of 97.0% by the 50th cycle, which demonstrates the excellent cycling stability. Furthermore, XRD characterization of the cycled electrode indicates that the Li2MnO3phase of the composite is inert, even under a high potential (4.8 V), which is in contrast with most previous reports of lithium-rich materials. The inertness of Li2MnO3is attributed to its high crystallinity and few structural defects, which make it difficult to activate. Hence, the final products demonstrate a favorable electrochemical performance with appropriate proportions of two phases in the composite, as high contents of inert Li2MnO3lower the capacity, while a sufficient structural stability cannot be achieved with low contents. The findings indicate that controlling the composition through a dynamic hydrothermal route is an effective strategy for developing a Mn-based cathode material for lithium-ion batteries.Keywords:lithium-rich manganese oxide;nanocomposite;dynamic hydrothermal;inert Li2MnO3;cycling stability
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Jianwei Liu,Jianan Wang,Lei Zhu,Xin Chen,Qianyue Ma,Zhicheng Xu,Shiyi Sun,Ning Wang,Qinqin Chai,Wei Yan
Lithium-sulfur (Li-S) batteries are considered to be promising candidates for next-generation storage systems. However, the practical applications are still hindered by the severe capacity decay, mainly caused by the large volume change, polysulfide shuttle and sluggish sulfur conversion kinetics. Herein, hollow urchin-like Mn 3 O 4 (HU-Mn 3 O 4 ) microspheres as sulfur hosts have been synthesized by the hydrothermal method and calcination treatment, aiming to prevent the polysulfide dissolution (benefiting from the strong polysulfide anchoring effect of Mn 3 O 4 ) and alleviate the volume expansion of sulfur (benefiting from the special hollow structure). Meanwhile, the urchin-like thorny surface also facilitates the rapid ion/electron transfer and the abundant active sites for the fast sulfur redox kinetics. When used as the sulfur host in Li-S batteries, the S@HU-Mn 3 O 4 cathode delivers a high initial capacity of 1137.4 mAh g −1 with a slow capacity decay of 0.042% after 200 cycles at 0.2 C. Even under the conditions of lean electrolyte (E/S = 7 mL g −1 ) and low N/P ratio (N/P = 2.1), the S@HU-Mn 3 O 4 cathode still enables a stable cycling performance with a high gravimetric energy density (202 Wh kg cell −1 ), demonstrating its great potential in the development of future practical Li-S battery materials.
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JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Pi Pi Wang,Fu Jie Yang,Jing Bai,Qiu Jie Huang,Bing Shao,Zheng Fan Xu,Chong Mao,Jin Huang
High-voltage Ni-rich based lithium-ion batteries with long-term cycled life can be obtained by reasonable regulation of the nonaqueous electrolyte components. Herein, a novel multifunctional electrolyte additive , isatin anhydride (IAn) is dedicated to construct stable solid-electrolyte-interface (SEI) films on the both Ni-rich layered LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode and graphite anode in a high-voltage pouch cell. Electrochemical tests reveal that IAn can significantly enhance the long-term cycling performance of the graphite/NCM523 full-cell at high voltage and high temperature. The pouch cell containing 1.0 wt% IAn shows an excellent capacity retention of 92.3% after 200 cycles between 3.0 and 4.5 V at 1.0C under 45 °C condition. In contrast, the cell without IAn appears a lower cycle performance after 192 cycles while the capacity retention decrease to 18.3%. Such obvious improvement of electrochemical performance contributes from the formation of thin and stable SEI films at two electrodes’ surfaces, leading to restraining the electrolyte decomposition and protecting material structures on the both cathode and anode .
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hongcheng Gao,Shihao Miao,Mengqin Shi,Xiaoxia Mao,Xiaojing Zhu
Low redox kinetics and shuttle effect of polysulfides (PSs) is a grand challenge for practical applications of lithium-sulfur (Li-S) batteries. Herein, cobalt (Co) nanoparticles embedded inside nitrogen (N)-doped hierarchical porous carbon (MgCo-HC) are prepared via one-pot approach. As a result, MgCo-HC unique structure with the large surface area and Co, N-doping is proposed for the strong physical/chemical adsorption of PSs, high conductivity, fast redox reaction kinetics and the high S utilization. The resultant S cathode delivers a high specific capacity of 1086.4 mA h/g at 0.1 C, low-capacity fading rate of 0.041% per cycle over 880 cycles at 2 C, and superior rate performance up to 5 C. More intriguingly, the S/MgCo-HC electrode delivers reversible area capacities of 5.1 and 5.5 mA h/cm 2 at 0.1 C under high S loading and learn electrolyte condition, respectively. Furthermore, the assembled Li-S soft-packaged battery is also readily assembled, which highlights stable electrochemical properties under folding conditions. This work provides a simple strategy to design advanced S hosts for the practical application of Li-S batteries with excellent electrochemical performance.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 38
·期 1
·200-208
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IF 1.307
Wang Yue,Wang Xiaoxue,She Ping,Guan Dehui,Song Lina,Xu Jijing
D esign and fabrication of functional porous air cathode materials with superior catalytic activity is still the key point for non-aqueous lithium-oxygen(Li-O 2 ) batteries. Herein, inspired by the self-standing three-dimensional(3D) structure of the natural spinach leaves, a unique binder-free and self-standing porous Au/spinach cathode for high-performance Li-O 2 batteries has been developed. The carbonized spinach leaves serve as a superconductive current collector and an ideal porous host for accommodating catalysts. The Au/spinach cathode could offer enough spaces for accommodating the discharge products, shorten the distance of the oxygen and electrolyte diffusion, and promote the oxygen reduction reaction(ORR) and oxygen evolution reaction (OER) processes. This optimized Au/spinach cathode achieved a high specific area capacity of 7.23 mA·h/cm 2 at a current density of 0.05 mA/cm 2 and exhibited excellent stability(280 cycles at 0.05 mA/cm 2 with a fixed capacity of 0.2 mA·h/cm 2 ). The superior performance encourages the construction of more advanced cathode architectures by the use of bio-composites for Li-O 2 batteries.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yu Wang,Haifeng Ji,Xiaojie Zhang,Jingjing Shi,Xiaona Li,Xiaoxia Jiang,Xiongwei Qu
Cyclopropenium cationic-based covalent organic polymer (iCP@TFSI) was successfully prepared through the SN2 reaction and ion replacement process, which can be incorporated into the PEO/LiTFSI matrix as a filler. The obtained solid-state polymer electrolytes were utilized for an all-solid-state lithium–sulfur (Li–S) battery. Padding iCP@TFSI into the PEO matrix not only has a positive influence on both the ionic conductivity and the mechanical capacity of solid-state polymer electrolytes but also increases the stability of the lithium metal anode, which essentially improves the overall cycling ability of all-solid-state Li–S batteries. Among the membranes attained, the PEO-10%iCP@TFSI electrolyte displays the best ionic conductivity up to 1.2 × 10–3 S·cm–1 at 80 °C. The symmetrical lithium battery exhibits higher cycle stability (600 h) due to the higher mechanical properties related to more stable lithium metal interfaces. The Li–S battery based on the PEO-10%iCP@TFSI electrolyte exhibits excellent electrochemical performance with better Coulombic efficiency and outstanding cycling stability. Its capacity is maintained at 490 mAh·g–1 after 500 cycles at 1 C with a 0.032% decay rate each cycle, and the Coulombic efficiency is close to 100% during the whole cycling.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 13
·17105-17114
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IF 2.478
Song Jiali,Wang Zhi,Gao Yu
Nanocrystalline Li 0 . 35 Ni 0.3 Fe 2.35 O 4 ferrites were prepared at different annealing temperatures by sol–gel auto-combustion method. The effects of the annealing temperature on the structure and magnetic properties of the synthesized Li–Ni ferrites were characterized by X-ray diffraction (XRD), scanning electron microscopy, Fourier transform infrared spectra and Vibrating Sample Magnetometer, and X-ray photoelectron spectrometer. Rietveld refinement of the XRD data confirmed the occurrence of phase transition from α-spinel to β-spinel, from which the ideal cation occupation and lattice parameter can be obtained. The grain size increased significantly with annealing temperature. The variation of saturation magnetization can be well explained in terms of the occupation of ions in tetrahedron and octahedron. The coercivity initially increased and later decreased significantly from 115 to 37 Oe with the increase of annealed temperature which could be attributed the fact that the 600 °C-annealed grain size is close to transition size from single- to multi-domain region.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hui Wang,Mouren Miao,Hui Li,Yuliang Cao,Hanxi Yang,Xinping Ai
Si is being actively developed as one of the most promising high-capacity anodes for next-generation lithium-ion batteries (LIBs). However, low cycling coulombic efficiency (CE) due to the repetitive growth of the solid electrolyte interphase (SEI) film is still an issue for its application in full batteries. Here, we propose a strategy to in situ form an artificial solid electrolyte interphase (ASEI) on the ferrosilicon/carbon (FeSi/C) anode surface by a purposely designed nucleophilic reaction of polysulfides with vinylene carbonate (VC) and fluoroethylene carbonate (FEC) molecules. The as-formed ASEI layer is mechanically dense and ionically conducting and therefore can effectively prevent the electrolyte infiltration and decomposition while allowing Li+ transport across, thus stabilizing the interface of the FeSi/C anode. As a result, the ASEI-modified FeSi/C anode exhibits a large reversible capacity of 1409.4 mA h g–1, an excellent cycling stability over 650 cycles, and a greatly elevated cycling CE of 99.8%, possibly serving as a high-capacity anode of LIBs.
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Energy & Environmental Materials
·
2021
·Vol. 5
·期 1
·353-359
·
IF 15.122
Xingyang Du,Hanying Zhang,Xuexia Lan,Bin Yuan,Renzong Hu
Silicon monoxide (SiO) has aroused increased attention as one of the most promising anodes for high-energy density Li-ion batteries. To enhance the initial Coulombic efficiencies (ICE) and cycle stability of SiO-based anodes, a new facile composition and electrode design strategy have been adapted to fabricate a SiO–Sn–Co/graphite (G) anode. It achieves a unique structure where tiny milled SiO–Sn–Co particles are dispersed among two graphite layers. In this hybrid electrode, Sn–Co alloys promoted Li + extraction kinetics, and the holistic reversibility of SiO and graphite enhanced the electrical conductivity. The SiO–Sn–Co/G electrode delivered an average ICE of 77.6% and a reversible capacity of 640 mAh g −1 at 800 mA g −1 , and the capacity retention was above 98% after 100 cycles, which was much higher than that of the SiO with an ICE of 55.3% and a capacity retention of 50%. These results indicated that this was reliable method to improve the reversibility and cycle ability of the SiO anode. Furthermore, based on its easy and feasible fabrication process, it may provide a suitable choice to combine other alloy anodes with the graphite anode.
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Nanoscale
·
2020
·Vol. 12
·期 47
·24196-24205
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IF 6.895
Heng Zhang,Peigen Zhang,Long Pan,Wei He,Qi Qi,Zhuoheng Bao,Li Yang,Wei Zhang,Michel W. Barsoum,ZhengMing Sun
Lithium–sulfur (Li–S) batteries are regarded as potential next-generation energy storage systems due to their high theoretical energy densities. However, the dissolution of lithium polysulfides (LiPSs) upon cycling can result in severe capacity degradation. Achieving high rate capabilities with good cycling stability remains a huge obstacle for the practical implementation of Li–S batteries. Here we developed a novel, multifunctional, hierarchical structure by self-assembling core–shell MnO2 nanorods @ hollow porous carbon with 2D Ti3C2Tx nanosheets, labelled as MCT, as an efficient polysulfide mediator for Li–S cathodes. The integration of the polar MnO2 core and hollow porous carbon shell captures LiPSs two ways: physical confinement and chemisorption. The conductive Ti3C2Tx nanosheets construct a continuous and conductive network, which not only promotes charge transfer and ion diffusion but also boosts LiPS adsorption and conversion. Based on these merits, the MCT/S cathode delivers good rate capability (688 mA h g−1 at 2.0C) and outstanding long-term cyclability (0.044% capacity decay per cycle over 600 cycles at 2.0C).
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Zhengyi Qian,Xudong Li,Liguang Wang,Tianpin Wu,Baoyu Sun,Lei Du,Yulin Ma,Chunyu Du,Pengjian Zuo,Geping Yin
Rechargeable aprotic Li–O2 batteries have drawn much attention in light of their ultrahigh theoretical energy density. However, the sluggish kinetics of oxygen cathode reactions lead to huge energy loss, while the unfavorable side reactions associated with the widely used carbon and binder account for fast battery decay during cycles. Herein, hierarchically holey IrNi alloy nanosheets are facilely designed on Ni foam substrate as a freestanding, binder- and carbon-free cathode to address these challenges. The IrNi nanosheets consist of numerous interconnected nanoparticles, forming abundant nanoholes, benefiting active-site exposure. Moreover, the meso-/macropores pave channels for the transfer of oxygen and lithium ions and provide enough accommodation for the insoluble Li2O2 product. The corresponding Li–O2 batteries demonstrate low polarization and excellent cycle stability with full discharge/charge capability (up to 292 cycles at a current density of 0.2 mA cm–2 within a voltage range from 2.3 to 4.3 V). The long-term cycling performance is principally attributed to the exclusive catalytic stability of the holey IrNi nanosheets and its good compatibility with dimethyl sulfoxide-based electrolyte. Our research provides novel insights into the design of robust and freestanding porous cathodes for high energy density Li–O2 batteries.
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ACS Applied Energy Materials
·
2020
·
IF 4.473
Jia Liu,Ying Wang,Dan Zhou,Dan Li,Ziye Kang,Haiming Xie
Although a redox mediator (RM) strategy can lower the overpotential of Li–O2 batteries (LOBs), the redox shuttling results in an undesired RM consumption and a continued decomposition of lithium metal anode, leading to a poor cycling stability. In this work, a hybrid inorganic–organic composite separator based on polyethylene oxide/TiO2/polypropylene (PEO/TiO2/PE) in LOBs has been reported for the first time, which aims to suppress the RM shuttling. The influences of TiO2 nanoparticles and PEO on battery performance are systematically investigated. Benefiting from the synergistic advantages, a LOB with PEO/TiO2/PE separator displays stable cyclability, considerable rate performance, and good reversibility. Additionally, the mechanism of inhibiting shuttling effect by this composite separator is proposed. We hope that this work can give an insight into the development of multiple functional separators for Li anode protection in LOBs.
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