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Xiaofeng He Xiao Liu Qing Han Peng Zhang Xiaosheng Song Yong Zhao 《Angewandte Chemie (International ed. in English)》2020,59(16):6397-6405
A proof‐of‐concept study on a liquid/liquid (L/L) two‐phase electrolyte interface is reported by using the polarity difference of solvent for the protection of Li‐metal anode with long‐term operation over 2000 h. The L/L electrolyte interface constructed by non‐polar fluorosilicane (PFTOS) and conventionally polar dimethyl sulfoxide solvents can block direct contact between conventional electrolyte and Li anode, and consequently their side reactions can be significantly eliminated. Moreover, the homogeneous Li‐ion flow and Li‐mass deposition can be realized by the formation of a thin and uniform solid‐electrolyte interphase (SEI) composed of LiF, LixC, LixSiOy between PFTOS and Li anode, as well as the super‐wettability state of PFTOS to Li anode, resulting in the suppression of Li dendrite formation. The cycling stability in a lithium–oxygen battery as a model is improved 4 times with the L/L electrolyte interface. 相似文献
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锂离子电池锡基合金体系负极研究 总被引:1,自引:0,他引:1
综述了锂离子电池锡基金属间化合物和复合物负极的研究进展。介绍了锡基合金体系作锂离子电池负极的优势, 指出了锡金属负极的不足,提出了采用锡基合金及其复合物是克服锡金属负极主体材料尺寸稳定问题的解决办法。概述了各种锡基合金和其复合物的结构、电化学性能、相应的加工方法和某些反应机理,总结了这些材料的优点和缺点,提出了改进这些材料性能的一些建议,如采用分散形态的纳米颗粒结构或用非晶合金并控制形态结构的转变,着重指出多相锡基锂合金复合物是最有前景的负极材料。 相似文献
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Core–Shell‐Structured CNT@RuO2 Composite as a High‐Performance Cathode Catalyst for Rechargeable Li–O2 Batteries
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Dr. Zelang Jian Dr. Pan Liu Dr. Fujun Li Dr. Ping He Dr. Xianwei Guo Prof. Mingwei Chen Prof. Haoshen Zhou 《Angewandte Chemie (International ed. in English)》2014,53(2):442-446
A RuO2 shell was uniformly coated on the surface of core CNTs by a simple sol–gel method, and the resulting composite was used as a catalyst in a rechargeable Li–O2 battery. This core–shell structure can effectively prevent direct contact between the CNT and the discharge product Li2O2, thus avoiding or reducing the formation of Li2CO3, which can induce large polarization and lead to charge failure. The battery showed a high round‐trip efficiency (ca. 79 %), with discharge and charge overpotentials of 0.21 and 0.51 V, respectively, at a current of 100 mA gtotal?1. The battery also exhibited excellent rate and cycling performance. 相似文献
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An Artificial Lithium Protective Layer that Enables the Use of Acetonitrile‐Based Electrolytes in Lithium Metal Batteries
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Dr. Ngoc Duc Trinh Dr. David Lepage Dr. David Aymé‐Perrot Prof. Antonella Badia Prof. Mickael Dollé Prof. Dominic Rochefort 《Angewandte Chemie (International ed. in English)》2018,57(18):5072-5075
The resurgence of the lithium metal battery requires innovations in technology, including the use of non‐conventional liquid electrolytes. The inherent electrochemical potential of lithium metal (?3.04 V vs. SHE) inevitably limits its use in many solvents, such as acetonitrile, which could provide electrolytes with increased conductivity. The aim of this work is to produce an artificial passivation layer at the lithium metal/electrolyte interface that is electrochemically stable in acetonitrile‐based electrolytes. To produce such a stable interface, the lithium metal was immersed in fluoroethylene carbonate (FEC) to generate a passivation layer via the spontaneous decomposition of the solvent. With this passivation layer, the chemical stability of lithium metal is shown for the first time in 1 m LiPF6 in acetonitrile. 相似文献
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Dr. Zhongchao Bai Dr. Yaohui Zhang Dr. Yuwen Zhang Dr. Chunli Guo Prof. Bin Tang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(50):18187-18191
Hierarchical hybridized nanocomposites with rationally constructed compositions and structures have been considered key for achieving superior Li‐ion battery performance owing to their enhanced properties, such as fast lithium ion diffusion, good collection and transport of electrons, and a buffer zone for relieving the large volume variations during cycling processes. Hierarchical MoS2@carbon microspheres (HMCM) have been synthesized in a facile hydrothermal treatment. The structure analyses reveal that ultrathin MoS2 nanoflakes (ca. 2–5 nm) are vertically supported on the surface of carbon nanospheres. The reversible capacity of the HMCM nanocomposite is maintained at 650 mA h g?1 after 300 cycles at 1 A g?1. Furthermore, the capacity can reach 477 mA h g?1 even at a high current density of 4 A g?1. The outstanding electrochemical performance of HMCM is attributed to the synergetic effect between the carbon spheres and the ultrathin MoS2 nanoflakes. Additionally, the carbon matrix can supply conductive networks and prevent the aggregation of layered MoS2 during the charge/discharge process; and ultrathin MoS2 nanoflakes with enlarged surface areas, which can guarantee the flow of the electrolyte, provide more active sites and reduce the diffusion energy barrier of Li+ ions. 相似文献
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Dr. Nian‐Wu Li Yang Shi Dr. Ya‐Xia Yin Dr. Xian‐Xiang Zeng Jin‐Yi Li Prof. Cong‐Ju Li Prof. Li‐Jun Wan Prof. Rui Wen Prof. Yu‐Guo Guo 《Angewandte Chemie (International ed. in English)》2018,57(6):1505-1509
Lithium (Li) metal is a promising anode material for high‐energy density batteries. However, the unstable and static solid electrolyte interphase (SEI) can be destroyed by the dynamic Li plating/stripping behavior on the Li anode surface, leading to side reactions and Li dendrites growth. Herein, we design a smart Li polyacrylic acid (LiPAA) SEI layer high elasticity to address the dynamic Li plating/stripping processes by self‐adapting interface regulation, which is demonstrated by in situ AFM. With the high binding ability and excellent stability of the LiPAA polymer, the smart SEI can significantly reduce the side reactions and improve battery safety markedly. Stable cycling of 700 h is achieved in the LiPAA‐Li/LiPAA‐Li symmetrical cell. The innovative strategy of self‐adapting SEI design is broadly applicable, providing opportunities for use in Li metal anodes 相似文献
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Fangyi Cheng Qing Zhao Xiaopeng Han Jun Chen 《Angewandte Chemie (International ed. in English)》2015,54(14):4338-4343
The ever‐increasing consumption of a huge quantity of lithium batteries, for example, Li–MnO2 cells, raises critical concern about their recycling. We demonstrate herein that decayed Li–MnO2 cells can be further utilized as rechargeable lithium–air cells with admitted oxygen. We further investigated the effects of lithiated manganese dioxide on the electrocatalytic properties of oxygen‐reduction and oxygen‐evolution reactions (ORR/OER). The catalytic activity was found to be correlated with the composition of LixMnO2 electrodes (0<x<1) generated in situ in aprotic Li–MnO2 cells owing to tuning of the Mn valence and electronic structure. In particular, modestly lithiated Li0.50MnO2 exhibited superior performance with enhanced round‐trip efficiency (ca. 76 %), high cycling ability (190 cycles), and high discharge capacity (10 823 mA h gcarbon?1). The results indicate that the use of depleted Li–MnO2 batteries can be prolonged by their application as rechargeable lithium–air batteries. 相似文献
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Chen Zhao Gui‐Liang Xu Tianshou Zhao Khalil Amine 《Angewandte Chemie (International ed. in English)》2020,59(40):17634-17640
Electrolyte modulation simultaneously suppresses polysulfide the shuttle effect and lithium dendrite formation of lithium–sulfur (Li‐S) batteries. However, the sluggish S redox kinetics, especially under high S loading and lean electrolyte operation, has been ignored, which dramatically limits the cycle life and energy density of practical Li‐S pouch cells. Herein, we demonstrate that a rational combination of selenium doping, core–shell hollow host structure, and fluorinated ether electrolytes enables ultrastable Li stripping/plating and essentially no polysulfide shuttle as well as fast redox kinetics. Thus, high areal capacity (>4 mAh cm?2) with excellent cycle stability and Coulombic efficiency were both demonstrated in Li metal anode and thick S cathode (4.5 mg cm?2) with a low electrolyte/sulfur ratio (10 μL mg?1). This research further demonstrates a durable Li‐Se/S pouch cell with high specific capacity, validating the potential practical applications. 相似文献
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Dr. Xing Xin Dr. Kimihiko Ito Dr. Arghya Dutta Prof. Yoshimi Kubo 《Angewandte Chemie (International ed. in English)》2018,57(40):13206-13210
Lithium (Li) dendrite formation is one of the major hurdles limiting the development of Li‐metal batteries, including Li‐O2 batteries. Herein, we report the first observation of the dendrite‐free epitaxial growth of a Li metal up to 10‐μm thick during charging (plating) in the LiBr‐LiNO3 dual anion electrolyte under O2 atmosphere. This phenomenon is due to the formation of an ultrathin and homogeneous Li2O‐rich solid‐electrolyte interphase (SEI) layer in the preceding discharge (stripping) process, where the corrosive nature of Br? seems to give rise to remove the original incompact passivation layer and NO3? oxidizes (passivates) the freshly formed Li surface to prevent further reactions with the electrolyte. Such reactions keep the SEI thin (<100 nm) and facilitates the electropolishing effect and gets ready for the epitaxial electroplating of Li in the following charge process. 相似文献
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Zhang Zhang Qiang Zhang Yanan Chen Jie Bao Xianlong Zhou Zhaojun Xie Jinping Wei Prof. Zhen Zhou 《Angewandte Chemie (International ed. in English)》2015,54(22):6550-6553
The utilization of the greenhouse gas CO2 in energy‐storage systems is highly desirable. It is now shown that the introduction of graphene as a cathode material significantly improves the performance of Li–CO2 batteries. Such batteries display a superior discharge capacity and enhanced cycle stability. Therefore, graphene can act as an efficient cathode in Li–CO2 batteries, and it provides a novel approach for simultaneously capturing CO2 and storing energy. 相似文献
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Yingying Mi Dr. Wen Liu Dr. Ke R. Yang Dr. Jianbing Jiang Dr. Qi Fan Dr. Zhe Weng Yiren Zhong Zishan Wu Prof. Gary W. Brudvig Prof. Victor S. Batista Prof. Henghui Zhou Prof. Hailiang Wang 《Angewandte Chemie (International ed. in English)》2016,55(47):14818-14822
Confining lithium polysulfide intermediates is one of the most effective ways to alleviate the capacity fade of sulfur‐cathode materials in lithium–sulfur (Li–S) batteries. To develop long‐cycle Li–S batteries, there is an urgent need for material structures with effective polysulfide binding capability and well‐defined surface sites; thereby improving cycling stability and allowing study of molecular‐level interactions. This challenge was addressed by introducing an organometallic molecular compound, ferrocene, as a new polysulfide‐confining agent. With ferrocene molecules covalently anchored on graphene oxide, sulfur electrode materials with capacity decay as low as 0.014 % per cycle were realized, among the best of cycling stabilities reported to date. With combined spectroscopic studies and theoretical calculations, it was determined that effective polysulfide binding originates from favorable cation–π interactions between Li+ of lithium polysulfides and the negatively charged cyclopentadienyl ligands of ferrocene. 相似文献
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Moran Balaish Prof. Emanuel Peled Prof. Diana Golodnitsky Prof. Yair Ein‐Eli 《Angewandte Chemie (International ed. in English)》2015,54(2):436-440
Non‐aqueous lithium–oxygen batteries are considered as most advanced power sources, albeit they are facing numerous challenges concerning almost each cell component. Herein, we diverge from the conventional and traditional liquid‐based non‐aqueous Li–O2 batteries to a Li–O2 system based on a solid polymer electrolyte (SPE‐) and operated at a temperature higher than the melting point of the polymer electrolyte, where useful and most applicable conductivity values are easily achieved. The proposed SPE‐based Li‐O2 cell is compared to Li–O2 cells based on ethylene glycol dimethyl ether (glyme) through potentiodynamic and galvanostatic studies, showing a higher cell discharge voltage by 80 mV and most significantly, a charge voltage lower by 400 mV. The solid‐state battery demonstrated a comparable discharge‐specific capacity to glyme‐based Li–O2 cells when discharged at the same current density. The results shown here demonstrate that the safer PEO‐based Li–O2 battery is highly advantageous and can potentially replace the contingent of liquid‐based cells upon further investigation. 相似文献
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Dr. Yuxi Xu Zhaoyang Lin Dr. Xing Zhong Ben Papandrea Prof. Yu Huang Xiangfeng Duan 《Angewandte Chemie (International ed. in English)》2015,54(18):5345-5350
A solvent‐exchange approach for the preparation of solvated graphene frameworks as high‐performance anode materials for lithium‐ion batteries is reported. The mechanically strong graphene frameworks exhibit unique hierarchical solvated porous networks and can be directly used as electrodes with a significantly improved electrochemical performance compared to unsolvated graphene frameworks, including very high reversible capacities, excellent rate capabilities, and superior cycling stabilities. 相似文献
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Zhiwei Zhao Prof. Dr. Jun Huang Prof. Dr. Zhangquan Peng 《Angewandte Chemie (International ed. in English)》2018,57(15):3874-3886
The lithium–air battery (LAB) is envisaged as an ultimate energy storage device because of its highest theoretical specific energy among all known batteries. However, parasitic reactions bring about vexing issues on the efficiency and longevity of the LAB, among which the formation and decomposition of lithium carbonate Li2CO3 is of paramount importance. The discovery of Li2CO3 as the main discharge product in carbonate‐based electrolytes once brought researchers to “the end of the idyll“ in the early 2010s. In the past few years, tremendous efforts have been made to understand the formation and decomposition mechanisms of Li2CO3, as well as to conceive novel chemical/material strategies to suppress the Li2CO3 formation and to facilitate the Li2CO3 decomposition. Moreover, the study on Li2CO3 in LABs is opening up a new research field in energy technology. Considering the rapid development and innumerous emerging issues, it is timely to recapitulate the current understandings, define the ambiguities and the scientific gaps, and discuss topics of high priority for future research, which is the aim of this Minireview. 相似文献
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Lithium metal has been considered as the most promising anode electrode for substantially improving the energy density of next‐generation energy storage devices. However, uncontrollable lithium dendrite growth, an unstable solid electrolyte interface (SEI), and infinite volume variation severely shortens its service lifespan and causes safety hazards, thus hindering the practical application of lithium metal electrodes. Here, carbon fiber film (CFF) modified by lithiophilic Co3O4 nanowires (denoted as Co3O4 Nws) was proposed as a matrix for prestoring lithium metal through a thermal infusion method. The homogeneous needle‐like Co3O4 nanowires can effectively promote molten lithium to infiltrate into the CFF skeleton. The post‐formed Co?Li2O nanowires produced by the reaction of Co3O4 Nws and molten lithium can homogeneously distribute lithium ions flux and efficaciously increase the adsorption energy with lithium ions proved by density functional theory (DFT) calculation, boosting a uniform lithium deposition without dendrite growth. Therefore, the obtained composite anode (denoted as CFF/Co?Li2O@Li) exhibits superior electrochemical performance with high stripping/plating capacities of 3 mAh cm?2 and 5 mAh cm?2 over long‐term cycles in symmetrical batteries. Moreover, in comparison with bare lithium anode, superior Coulombic efficiencies coupled with copper collector and full battery behaviors paired with LiFePO4 cathode are achieved when CFF/Co?Li2O@Li composite anode was employed. 相似文献
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Lei Ye Dr. Meng Liao Dr. Bingjie Wang Prof. Huisheng Peng 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(19):e202103300
The main limitation of lithium (Li) metal anodes lies in their severe dendrite growth due to nonuniform Li+ flux and sluggish Li+ transportation at the anode surface. Fabricating artificial protective overlayer with tunable surficial properties on Li metal is a precise and effective strategy to relieve this problem. In this Concept article, we focus on the basic principles of regulating interfacial Li+ through artificial protective overlayers and summarize the material preparation as well as structural design of these overlayers. The remaining challenges and promising directions of artificial protective overlayers are then highlighted to provide clues for the practical application of Li metal anodes. 相似文献
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Green Template‐Free Synthesis of Hierarchical Shuttle‐Shaped Mesoporous ZnFe2O4 Microrods with Enhanced Lithium Storage for Advanced Li‐Ion Batteries
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Prof. Linrui Hou Hui Hua Lin Lian Hui Cao Siqi Zhu Prof. Changzhou Yuan 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(37):13012-13019
In the work, a facile and green two‐step synthetic strategy was purposefully developed to efficiently fabricate hierarchical shuttle‐shaped mesoporous ZnFe2O4 microrods (MRs) with a high tap density of ~0.85 g cm3, which were assembled by 1D nanofiber (NF) subunits, and further utilized as a long‐life anode for advanced Li‐ion batteries. The significant role of the mixed solvent of glycerin and water in the formation of such hierarchical mesoporous MRs was systematically investigated. After 488 cycles at a large current rate of 1000 mA g?1, the resulting ZnFe2O4 MRs with high loading of ~1.4 mg per electrode still preserved a reversible capacity as large as ~542 mAh g?1. Furthermore, an initial charge capacity of ~1150 mAh g?1 is delivered by the ZnFe2O4 anode at 100 mA g?1, resulting in a high Coulombic efficiency of ~76 % for the first cycle. The superior Li‐storage properties of the as‐obtained ZnFe2O4 were rationally associated with its mesoprous micro‐/nanostructures and 1D nanoscaled building blocks, which accelerated the electron transportation, facilitated Li+ transfer rate, buffered the large volume variations during repeated discharge/charge processes, and provided rich electrode–electrolyte sur‐/interfaces for efficient lithium storage, particularly at high rates. 相似文献