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Journal of Energy Chemistry 2020年第11期29卷 286-295页

作者： Meng Li jingyi qiu Songtong Zhang Pengcheng Zhao Zhaoqing Jin Anbang Wang Yue Wang Yusheng Yang Hai Ming School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Research Institute of Chemical Defense Beijing 100191China Beijing Key Laboratory of Advanced Chemical Energy Storage Technology and Materials Research Institute of Chemical DefenseBeijing 100191China

Various nanostructured architectures have been demonstrated to be effective to address the issues of high capacity Si anodes. However, the scale-up of these nano-Si materials is still a critical obstacle for commercialization. Herein, we use industrial ferrosilicon as low-cost Si source and introduce a facile and scalable method to fabricate a micrometer-sized ferrosilicon/C composite anode, in which ferrosilicon microparticles are wrapped with multi-layered carbon nanosheets. The multi-layered carbon nanosheets could effectively buffer the volume variation of Si as well as create an abundant and reliable conductivity framework, ensuring fast transport of electrons. As a result, the micrometer-sized ferrosilicon/C anode achieves a stable cycling with 805.9 m Ah g-1 over 200 cycles at 500 mA g-1 and a good rate capability of455.6 mAh g-1 at 10 A g-1. Therefore, our approach based on ferrosilicon provides a new opportunity in fabricating cost-effective, pollution-free, and large-scale Si electrode materials for high energy lithium-ion batteries.

关键词： Ferrosilicon Multi-layered carbon nanosheets Micrometer-sized Si Material structural design Anode Lithium-ion batteries

In-situ construction of hybrid artificial SEI with fluorinated siloxane to enable dendrite-free Li metal anodes

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Journal of Materiomics 2023年第2期9卷 318-327页

作者： Lei Wei Zhaoqing Jin Jianhao Lu Yang Guo Zilong Wang Gaoping Cao jingyi qiu Anbang Wang Weikun Wang State Key Laboratory of NBC Protection for Civilian Beijing102205China Research Institute of Chemical Defense Beijing100191China Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical TechnologyBeijing100029China

Lithium(Li)metal anode holds great promise for high-energy-density rechargeable ***,it suffers from the Li dendrites growth and uncontrollable side reactions with electrolyte due to the unstable solid electrolyte interphase(SEI)***,we propose a facile strategy for the in-situ fabricate of organic-inorganic composite artificial SEI layers on Li surfaces,which consist of organic fluorinated siloxane and inorganic LiF-rich *** hybrid artificial SEI endows high mechanical strength(13.1 GPa)and Liþtransfer number(0.62).Such robust SEI protective layers can not only guide uniform nucleation and deposition of Li metal by facilitating uniform Li-ion distribution,but also prevent unfavourable side ***,the protected metallic lithium anode(PMTFPS-Li)anode enables stable Li plating/stripping performance in symmetric cells for more than 300 h at 4 mA$h/cm^(2)under a high areal capacity of 4 mA/cm^(2).Moreover,the PMTFPS-Li/S cells could maintain more than 300 stable cycles at 0.5C and the PMTFPS-Li/LFP cells present excellent cycling performance(400 cycles at 1C)and enhanced rate capability(110.4 mA$h/g at 3 C).This work will inspire the design of artificial SEI on Li anodes for advanced Li metal batteries.

关键词： Fluorinated siloxane Lithium metal anode Dendrite growth Artificial SEI In-situ reaction

Theory-guided construction of electron-deficient sites via removal of lattice oxygen for the boosted electrocatalytic synthesis of ammonia

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Nano Research 2021年第5期14卷 1457-1464页

作者： Li Zhang Shilong Jiao Xin Tan Yuliang Yuan Yu Xiang Yu-Jia Zeng jingyi qiu Ping Peng Sean C.Smith Hongwen Huang College of Materials Science and Engineering Hunan UniversityChangsha410082China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen518061China Integrated Materials Design Laboratory Department of Applied MathematicsResearch School of PhysicsThe Australian National UniversityCanberraACT2601Australia Research Institute of Chemical Defense Beijing100191China

Rational design of catalytic sites to activate the inert N≡N bond is of paramount importance to advance N2 electroreduction. Here, guided by the theoretical predictions, we construct a NiFe layered double hydroxide (NiFe-LDH) nanosheet catalyst with a high density of electron-deficient sites, which were achieved by introducing oxygen vacancies in NiFe-LDH. Density functional theory calculations indicate that the electron-deficient sites show a much lower energy barrier (0.76 eV) for the potential determining step compared with that of the pristine NiFe-LDH (2.02 eV). Benefiting from this, the NiFe-LDH with oxygen vacancies exhibits the greatly improved electrocatalytic activity, presenting a high NH3 yield rate of 19.44 µg·h−1·mgcat−1, Faradaic efficiency of 19.41% at −0.20 V vs. reversible hydrogen electrode (RHE) in 0.1 M KOH electrolyte, as well as the outstanding stability. The present work not only provides an active electrocatalyst toward N2 reduction but also offers a facile strategy to boost the N2 reduction.

关键词： nitrogen reduction density functional theory oxygen vacancies electron-deficient sites

New Insight on Graphite Anode Degradation Induced by Li-Plating

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Energy & Environmental Materials 2022年第3期5卷 872-876页

作者： Yongchuang Xiong Yan Liu Long Chen Songtong Zhang Xiayu Zhu Tengteng Shen Dongsheng Ren Xiangming He jingyi qiu Li Wang Qiao Hu Hao Zhang Research Institute of Chemical Defense Beijing 100191China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

Graphite is the dominant anode material for lithium-ion batteries;however,it still suffers from Li-plating when charging fast or at low temperature,and Liplating is associated with performance fading and safety ***,we clarify the mechanism of lithium evolution from graphite particles by overlithiation cycle test,in-situ XRD,and titration gas *** observe that the graphite intercalation compounds(GICs,LiC_(12) and LiC_(6)e.g.)gradually become inactive and wrapped by dead lithium or side reaction sediments,while the rate of this degradation will be accelerated as the overpotential of Liplating is decreased after initial Li metal *** understanding is contradictory to the popular one that the degradation of graphite anode after Li plating is mainly caused by the inferior SEI and dead Li induced hindering of Li-ion *** isolation of lithiated graphite particles leading to the fast vanishing of Li insertion/deintercalation process in graphite *** further study the insertion/deintercalation vanishing process at low temperature and high rates,*** work provides a insight on graphite anode degradation induced by Li-plating,and the new understanding can be used to guide the design of advanced materials and electrodes to avoid Li-plating and achieve extreme fast while safe charging.

关键词： degradation graphite Li plating lithium-ion battery over-lithiation

Material Engineering Platform for Next Generation of Neurobiological Interfaces

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Accounts of Materials Research 2021年第5期2卷 311-314页

作者： Siyuan Rao jingyi qiu Department of Biomedical Engineering University of Massachusetts AmherstAmherstMassachusetts 01003United States

Engineering innovations at neurobiological interfaces open up the opportunities to investigate the nervous system and to further reveal the neurological principles underlying neurological and psychiatric *** information exchange at the interfaces bridges the external engineering systems to the internal biological ***,the neurobiological interfaces become an important workplace for neural *** the neurobiological system from the cellular,the neural circuit and to the system level,information flow is always bidirectional with multiple *** probe the most accurate neural circuitry mechanism,it is essential to modulate and record cellular neural dynamics in naturally behaving *** leads to grand challenges for engineering tool development at the neurobiological interfaces:addressing the complexity of information delivery,processing,and dissemination within the naturally functioning nervous system.

关键词： neural system bridges

Insights for understanding multiscale degradation of LiFePO_(4) cathodes

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eScience 2022年第2期2卷 125-137页

作者： Li Wang jingyi qiu Xiaodan Wang Long Chen Gaoping Cao Jianlong Wang Hao Zhang Xiangming He Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China Research Institute of Chemical Defense Beijing100191China

Lithium-ion batteries(LIBs)based on olivine LiFePO_(4)(LFP)offer long cycle/calendar life and good safety,making them one of the dominant batteries in energy storage stations and electric vehicles,especially in *** scientists have a weak understanding of LFP cathode degradation,which restricts the further development of LFP materials and ***,we critically review reports on LFP cathode degradation with respect to different electric parameters(including C-rates,storage,and long cycling),mechanical stresses,and thermal *** detailed chemical and physical aspects of degradation mechanisms at various scales(i.e.,from atomic to devices)and their causes are comprehensively summarized,and discussions of related concerns are provided in each *** close with a systematic overview of LFP degradation research and mediation strategies,suggesting future directions for developing robust,safe LFP batteries with long cycle life.

关键词： Lithium-ion batteries LiFePO_(4)cathodes Multiscale degradation Multisource field Safety

Hard-carbon hybrid Li-ion/metal anode enabled by preferred mesoporous uniform lithium growth mechanism

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Journal of Energy Chemistry 2024年第1期88卷 252-259,I0006页

作者： Fang Yan Yan Liu Yuan Li Yan Wang Zicen Deng Meng Li Zhenwei Zhu Aohan Zhou Ting Li jingyi qiu Gaoping Cao Shaobo Huang Biyan Wang Hao Zhang School of Chemistry and Biological Engineering University of Science and TechnologyBeijing 100083China Research Institute of Chemical Defense Beijing 100191China College of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023HenanChina National Base for International Science&Technology Cooperation School of ChemistryXiangtan UniversityXiangtan 411105HunanChina Materials and Manufacturing Department Beijing University of TechnologyBeijing 100124China

To achieve high energy density in lithium batteries,the construction of lithium-ion/metal hybrid anodes is a promising *** particular,because of the anisotropy of graphite,hybrid anode formed by graphite/Li metal has low transport kinetics and is easy to causes the growth of lithium dendrites and accumulation of dead Li,which seriously affects the cycle life of batteries and even causes safety ***,by comparing graphite with two types of hard carbon,it was found that hybrid anode formed by hard carbon and lithium metal,possessing more disordered mesoporous structure and lithophilic groups,presents better *** indicate that the mesoporous structure provides abundant active site and storage space for dead *** the synergistic effect of this structure and lithophilic functional groups(–COOH),the reversibility of hard carbon/lithium metal hybrid anode is maintained,promoting uniform deposition of lithium metal and alleviating formation of lithium *** hybrid anode maintains a 99.5%Coulombic efficiency(CE)after 260 cycles at a specific capacity of 500 m Ah/*** work provides new insights into the hybrid anodes formed by carbon-based materials and lithium metal with high specific energy and fast charging ability.

关键词： Hard carbon/Li metal hybrid anode Mesoporous structure Surface oxygen functional group Fast charging Lithium batteries

STUDIES ON METHYL METHACRYLATE POLYMERIZATION INITIATED WITH PIPERIDINE DERIVATIVES AND ORGANIC PEROXIDE SYSTEMS

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Chemical Journal of Chinese Universities 1985年第2期 114-120页

作者： Zhang jingyi,qiu Kunyuan and Feng Xinde(The First Branch of Peking University,Beijing)(Chemistry Department,Peking University,Beijing)

The polymerization of methyl methacrylate(MMA) initiated with piperidine derivatives,such as,piperidine(P),2,2,6,6-tetramethyl-4-hydroxyl piperidine(TMP),N-ethyl iperidine(NEP),1,2,2,6,6-pentamethyl-4-hydroxyl piperidine(PMP),and organic peroxides,such as,benzoyl peroxide(BPO),lauryl peroxide(LPO),f-butyl hydroperoxide (TBH),t-butyl peroxybenzoate(TBPB) systems was studied and discussed in this *** polymerization rate equation and the activation energy of polymerization were determined respectively.

关键词： NEP BPO STUDIES ON METHYL METHACRYLATE POLYMERIZATION INITIATED WITH PIPERIDINE DERIVATIVES AND ORGANIC PEROXIDE SYSTEMS LPO PMP

一种支持单向链路的PUMA改进组播路由协议

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计算机应用与软件 2017年第10期34卷 199-204,226页

作者：邱静怡广东外语外贸大学广东广州510006

研究表明在无线自组网场景中通常存在非对称、单向链路,但是目前大部分路由协议都是针对双向链路设计的。故针对单向链路问题,提出改进的组播路由算法PUMA-UD,收集单向链路信息进行路由选择,这有利于邻域管理且提高通信质量。使用NS2仿... 详细信息

研究表明在无线自组网场景中通常存在非对称、单向链路,但是目前大部分路由协议都是针对双向链路设计的。故针对单向链路问题,提出改进的组播路由算法PUMA-UD,收集单向链路信息进行路由选择,这有利于邻域管理且提高通信质量。使用NS2仿真平台进行仿真验证,将改进后的协议与原PUMA和FLOOD进行比较,结果显示当网络负载增大时,PUMA-UD在报文投递率和端到端延时方面优于PUMA和FLOOD。

关键词：移动自组网组播路由单向链路 PUMA

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全钒液流电池离子交换膜合成方法综述

膜科学与技术 2011年第6期31卷 101-105,110页

作者：邱景义马骏翟茂林北京大学化学与分子工程学院北京分子科学国家实验室北京100871 防化研究院军用化学电源研发中心北京100191

全钒氧化还原液流电池(VRFB)具有储能效率高、循环寿命长、安全可靠、低成本等优点,在大规模储能中具有良好的应用前景.而作为VRFB的核心部件,离子交换膜应具有钒离子透过率低、电导率高、化学稳定性好等性能.总结了近年来国内外相关的... 详细信息

全钒氧化还原液流电池(VRFB)具有储能效率高、循环寿命长、安全可靠、低成本等优点,在大规模储能中具有良好的应用前景.而作为VRFB的核心部件,离子交换膜应具有钒离子透过率低、电导率高、化学稳定性好等性能.总结了近年来国内外相关的研究进展,对比了不同合成方法的优缺点,并提出了开发适用于VRFB的高性能离子交换膜的建议.

关键词：全钒氧化还原液流电池离子交换膜合成方法