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Flexible Na batteries

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InfoMat 2020年第1期2卷 126-138页

作者： chenglong Zhao Yaxiang Lu liquan chen Yong-Sheng Hu Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Yangtze River Delta Physics Research Center Co.Ltd LiyangChina

Flexible energy storage devices have gained significant attention because of the increasing needs of bendable displays,wearable electronics,and flexible *** Na-based rechargeable batteries are the promising power sources in such products due to their low cost and wide *** this review,we firstly introduce the structural superiority of flexible Na-based batteries and summarize their main components including cathodes,electrolytes,and ***,fabrication of their flexible components is discussed in detail,with specific emphasis on material selection,particularly for solid-state *** is followed by an overview highlighting recent progress in the development of prototypes of flexible Na-ion batteries and ***,perspectives on future challenges for the development of flexible Na batteries are proposed.

关键词： anode cathode electrolyte flexible device Na battery

First-Principles Study of Lithium and Sodium Atoms Intercalation in Fluorinated Graphite

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Engineering 2015年第2期1卷 243-246页

作者： Fengya Rao Zhiqiang Wang Bo Xu liquan chen Chuying Ouyang Department of Physics Jiangxi Normal University Laboratory for Solid State Ionics Institute of Physics Chinese Academy of Sciences

The structure evolution of fluorinated graphite （CFx） upon the Li/Na intercalation has been studied by first- principles calculations. The Li/Na adsorption on single CF layer and intercalated into bulk CF have been calculated. The better cycling performance of Na intercalation into the CF cathode, comparing to that of Li intercalation, is attributed to the different strength and characteristics of the Li-F and Na-F interactions. The interactions between Li and F are stronger and more localized than those between Na and E The strong and localized Coulomb attraction between Li and F atoms breaks the C-F bonds and pulls the F atoms away, and graphene sheets are formed upon Li intercalation.

关键词： first-principles Li/Na rechargeable batteries fluorinated graphite.

High-temperature treatment induced carbon anode with ultrahigh Na storage capacity at low-voltage plateau

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Science Bulletin 2018年第17期63卷 1125-1129页

作者： chenglong Zhao Qidi Wang Yaxiang Lu Baohua Li liquan chen Yong-Sheng Hu Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Division of Energy and Environment Engineering Laboratory for the Next Generation Power and Energy Storage Batteries Graduate School at Shenzhen Tsinghua Universty Shenzhen 518055 Chino School of Materials Science and Engineering Tsinghua University Beijing 100084 China

Sodium-ion batteries （NIBs） show great prospect on the energy storage applications benefiting from thei low cost and the abundant Na resources despite the expected lower energy density compared wit lithium-ion batteries （LIBs）. To further enhance the competitive advantage, especially in energy densit3 developing the high-capacity carbon anode materials can be one of the effective approaches to realiz this goal. Herein, we report a novel carbon anode made from charcoal with a high capacity of ~400 Ah g i, wherein about 85% （〉330 mAh g^-1） of its total capacity is derived from the long plateau regio below ~0.1 V. which differs fiom those of typical hard carbon materials （~300 mAh g^-l） in NIBs but i similar to the graphite anode in LIBs. When coupled with air-stable ***.22Feo.3oMno.4802 oxid cathode, a high-energy density of ~240 Wh kg^-1 is achieved with good rate capability and cyclin stability. The discovery of this promising carbon anode is expected to further improve the energy densit of NIBs towards large-scale electrical energy storage.

关键词： Sodium-ion battery Na storage Hard carbon Charcoal High-temperature carbonization Low-voltage plateau

Investigation on the electrochemical activation process of Li1.20Ni0.32Co0.004Mn0.476O2

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Progress in Natural Science:Materials International 2014年第4期24卷 388-396页

作者： Daichun Tang Daotan Liu Yanyan Liu Zhenzhong Yang liquan chen Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences China Electric Power Research Institute

The lithium-rich layered oxides are one of the most attractive cathode materials for lithium-ion ***,two types of Li1.20Ni0.32Co0.004Mn0.476O2 were synthesized using Li2CO3 and LiOH as lithium *** electrochemical activation process occurs in Li1.2Ni0.32Co0.004Mn0.476O2 prepared from Li2CO3(LLO-1),while no obvious activation in Li1.2Ni0.32Co0.004Mn0.476O2 prepared from LiOH(LLO-2) is *** advanced scanning transmission electron microscopy(STEM),we found that Li2MnO3-like structure is rich in the surface region of *** study provides a direct explanation for the electrochemical activation of lithium-rich *** sample with more LiMO2-like phase at the surface region shows a better cycling *** is likely that more LiMO2-like phase at the surface region could stabilize the interface and improve the cycling performance of the Li-rich cathode materials.

关键词： Lithium-rich Electrochemical activation Surface structure STEM imaging

An Enhanced Direct Anonymous Attestation Scheme with Mutual Authentication for Network-Connected UAV Communication Systems

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China Communications 2018年第5期15卷 61-76页

作者： liquan chen Sijie Qian Ming Lim Shihui Wang School of Information Science and Engineering Southeast University Research Center of Supply Chain and Operations Management Coventry University

In network-connected UAV(NCUAV) communication systems, user authentication is replaced by platform identity authentication and integrity check because many NC-UAVs are operated without human intervention. Direct anonymous attestation(DAA) is an attractive cryptographic scheme that provides an elegant balance between platform authentication and anonymity. However, because of the low-level computing capability and limited transmission bandwidth in UAV, the existing DAA schemes are not suitable for NC-UAV communication systems. In this paper, we propose an enhanced DAA scheme with mutual authentication(MA-DAA scheme), which meets the security requirements of NC-UAV communication systems. The proposed MA-DAA scheme, which is based on asymmetric pairings, bundles the identities of trusted platform module(TPM) and Host to solve the malicious module changing attacks. Credential randomization, batch proof and verification, and mutual authentication are realized in the MA-DAA scheme. The computational workload in TPM and Host is reduced in order to meet the low computation and resource requirements in TPM and *** entire scheme and protocols are presented,and the security and efficiency of the proposed MA-DAA scheme are proved and *** experiment results also confirm the high efficiency of the proposed scheme.

关键词： network-connected UAV trusted computing direct anonymous attestation mutual authentication trusted platform module

Improving thermal stability of sulfide solid electrolytes:An intrinsic theoretical paradigm

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InfoMat 2022年第8期4卷 105-120页

作者： Shuo Wang Yujing Wu Hong Li liquan chen Fan Wu Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina Tianmu Lake Institute of Advanced Energy Storage Technologies LiyangJiangsuChina Yangtze River Delta Physics Research Center LiyangJiangsuChina Nano Science and Technology Institute University of Science and Technology of ChinaSuzhouChina

All-solid-state batteries(ASSBs)have been widely acknowledged as the key next-generation energy storage technology/device,due to their high safety and energy *** all solid electrolytes(SEs)that have been studied for ASSBs,sulfide SEs represent the most promising technical route due to their ultra-high ionic conductivity and desirable mechanical ***,few results have been reported to study the thermal stability/safety issue of sulfide SEs and ***,we develop the first-of-its-kind theoretical paradigm and a new conceptual parameter Th to quantitatively calculate/predict the essential thermal stability of sulfide *** theoretical paradigm takes all types of parameters(*** structure,localized polyhedra configuration,bond energy,bond type,bond number,normalization factor,and the energy correction factor)into consideration,and more importantly,can be simplified into one straightforward equation for its convenient application in any crystal-line *** prove its functionality,the typical experimental strategies(stoichiometric ratio control and elemental doping)are adopted for typical sul-fide SEs(Li7P3S11,Li3PS4)to improve their thermal stabilities,based on the predictions obtained from the derived theory and ***,the potential doping elements to improve thermal stability of sulfide SEs are screened throughout the whole periodic table,and the theoretically predicted trends correspond well with experimental *** work may represent the most critical breakthroughs in the research field of thermal stability for sul-fide SEs,not only because it fills the gap of this field,but also due to its precise and quantitative prediction based on a complete consideration of all parameters that determine their thermal *** handy model devel-oped herein can also be applied to any crystalline materials.

关键词： all-solid-state batteries safety sulfide solid electrolytes theoretical paradigm thermal stability

Progress in thermal stability of all-solid-state-Li-ion-batteries

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InfoMat 2021年第8期3卷 827-853页

作者： Yujing Wu Shuo Wang Hong Li liquan chen Fan Wu Tianmu Lake Institute of Advanced Energy Storage Technologies LiyangJiangsuChina Yangtze River Delta Physics Research Center LiyangJiangsuChina Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina

Thermal safety is one of the major issues for lithium-ion batteries(LIBs)used in electric *** thermal runaway mechanism and process of LIBs have been extensively studied,but the thermal problems of LIBs remain intractable due to the flammability,volatility and corrosiveness of organic liquid *** ultimately solve the thermal problem,all-solid-state LIBs(ASSLIBs)are considered to be the most promising ***,research on the thermal stability of solid-state electrolytes(SEs)is still in its initial stage,and the thermal safety of ASSLIBs still needs further ***,the specified reviews summarizing the thermal stability of ASSLIBs and all types of SEs are still *** fill this gap,this review systematically discussed recent progress in the field of thermal properties investigation for ASSLIBs,form levels of materials and interface to the whole *** thermal properties of three major types of SEs,including polymer,oxide,and sulfide SEs are systematically reviewed *** review aims to provide a comprehensive understanding of the thermal stability of SEs for the benign development of ASSLIBs and their promising application under practical operating conditions.

关键词： interface safety solid-state battery solid-state electrolyte thermal stability

Advanced Na metal anodes

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Journal of Energy Chemistry 2018年第6期27卷 1584-1596页

作者： chenglong Zhao Yaxiang Lu Jinming Yue Du Pan Yuruo Qi Yong-Sheng Hu liquan chen Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190 China

Na metal anode, benefiting from its high theoretical capacity and lowest electrochemical potential, ~sone of the most favorable candidates for future Na-based batteries with high energy density. Dendritegrowth, volume change and high reactivity are the formidable challenges in terms of good cycling perfor-mance and high Coulombic efficiency as well as an expected safety guarantee of Na metal anode for thepractical application. Solid electrolyte interphase （SEI） layer as an indispensable component of a battery,its formation and stability play the critical role in the feasibility of Na metal anode. In this review, wefirst discuss the current consideration and challenges of Na metal anode, and then summarize severalstrategies to suppress dendrite growth and improve electrochemical performance, including interface en-gineering, electrolyte composition, electrode construction, and so on. Finally, the conclusion and futureperspective of potential development on Na metal anode are proposed.

关键词： Na metal anode Solid electrolyte interphase Electrolyte Dendrite Na-metal batteries

Recent Progress in Presodiation Technique for High-Performance Na-Ion Batteries

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Chinese Physics Letters 2021年第11期38卷 83-90页

作者： Fei Xie Yaxiang Lu liquan chen Yong-Sheng Hu Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

Na-ion batteries(NIBs) have been attracting growing interests in recent years with the increasing demand of energy storage owing to their dependence on more abundant Na than Li. The exploration of the industrialization of NIBs is also on the march, where some challenges are still limiting its step. For instance, the relatively low initial Coulombic efficiency(ICE) of anode can cause undesired energy density loss in the full cell. In addition to the strategies from the sight of materials design that to improve the capacity and ICE of electrodes, presodiation technique is another important method to efficiently offset the irreversible capacity and enhance the energy density. Meanwhile, the slow release of the extra Na during the cycling is able to improve the cycling *** this review, we would like to provide a general insight of presodiation technique for high-performance *** recent research progress including the principles and strategies of presodiation will be introduced, and some remaining challenges as well as our perspectives will be discussed. This review aims to exhibit the basic knowledge of presodiation to inspire the researchers for future studies.

关键词： Recent Progress in Presodiation Technique for High-Performance Na-Ion Batteries