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ZnCo2O4/ZnO induced lithium deposition in multi-scaled carbon/nickel frameworks for dendrite-free lithium metal anode

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Journal of Energy Chemistry 2020年第4期29卷 16-23页

作者： Kai Wu Binglu Zhao Chengkai Yang Qian Wang Wen Liu henghui zhou College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China College of Science Beijing University of Chemical TechnologyBeijing 100029China Beijing National Laboratory for Molecular Sciences Beijing 100871China Beijing Engineering Research Center of Power Lithium-ion Battery Beijing 102202China

Lithium metal attracts growing attention as an ideal anode candidate for next generation lithium battery systems owing to its high capacity,low density,and low working ***,the volume expansion of the bulk and dendrite growth on the surface of lithium anode limits its practical ***,we fabricate a composite lithium host featuring both multiple scaled structure and lithiophilic property to address obstacles at both aspects of bulk and surface *** which,the multiple scaled structure provides void space to accommodate lithium volume change while zinc and cobalt oxides sites derived from Zeolitic Imidazolate Frameworks can react with lithium and form a stable solid electrolyte interphase,leading to a stable cycling of lithium symmetrical cell for more than 500 cycles with voltage hysteresis of only 88 mV at 2 mAcm^-2 and 5 mAh cm^-***,full cells paired with LiFePO4 cathode can realize 500 cycles with 99.2%capacity retention,showing great potential for practical *** excellent electrochemical performance of the composite lithium anode proves the effectiveness of our anode design with multiple scaled structure and lithiophilic feature,which can be also expanded to other metal anodes for batteries.

关键词： Lithium metal battery Lithium metal anode Zeolitic Imidazolate Frameworks Lithiophilic surface SEI

Enhancing the ionic conductivity in a composite polymer electrolyte with ceramic nanoparticles anchored to charged polymer brushes

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Chinese Chemical Letters 2020年第3期31卷 831-835页

作者： Bintao Zhao Xi Lu Qian Wang Jingfa Yang Jiang Zhao henghui zhou College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China Pulead Technology Industry Co.Ltd. Beijing 102200China Institute of Chemistry Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Polymer electrolytes a re essential for next-gene ration lithium batteries because of their excellent safety ***,low ionic conductivity is the main obstacle restricting their commercial *** with nanoparticles are a promising route to overcome this *** this work,lithium polystyrene sulfonate brushes(LiPSS)is anchored to silicon dioxide nanoparticles with chemical bonding using atom transfer radial polymerization(SI-ATRP).The composite polymer electrolytes are made by mixing vinylene carbonate and nanoparticles via a facile in situ polymerization *** ionic conductivity of composite polymer electrolytes is improved to 7.2×10^-4 S/cm at room temperature,which is attributed to the low degree of crystallinity of polymer electrolyte and the fast ion transport on the surfaces of polymer brush layers that act as a conductive *** composite polymer electrolytes show a wide electrochemical window of approximately 4.5 V ***^+/Li and excellent cycling performance retention of approximately 95%after 100 cycles at ambient *** results also prove that surface groups of ceramic na noparticles are an important way to increase the electrochemical properties of composite polymer electrolytes.

关键词： Polymer electrolyte Polymer brushes Solid batteries Nanoparticles Composite electrolyte

Interwoven nickel(II)-dimethylglyoxime nanowires in 3D nickel foam for dendrite-free lithium deposition

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Chinese Chemical Letters 2022年第4期33卷 2165-2170页

作者： Tianyi zhou Yanlu Mu Jianyang Wu Bing Zhong Chengkai Yang Qian Wang Wen Liu henghui zhou Peng Jiang CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China Institute of Energy Innovation College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China

Metal skeletons,such as Nickel Foam(NF) has attracted worldwide interests as stable host for lithium metal anode because of its high stability,large specific surface area and high ***,most metal skeletons have lithophobic surface and uneven current distribution that result in sporadic lithium nucleation and uncontrolled dendrites ***,we describe a sequential immersing strategy to generate interwoven Nickel(Ⅱ)-dimethylglyoxime(Ni-DMG) nanowires at NF to obtain composite skeleton(NDNF),which can be used as an stable host for Li metal *** Ni-DMG has proved effective to realize uniform lithium nucleation and dendrite-free lithium *** with the three dimensional(3 D) hierarchical porous structure,the composite host shows a significantly improved coulombic efficiency(CE) than pristine commercial nickel ***,the corresponding Li‖Li symmetrical cells can run more than 700 h with low voltage hysteresis 22 mV at 1.0 mA/cm^(2),and Li@NDNF‖LiFePO;full-cell exhibits a high capacity retention of 82.03% at 1.0 C during 630 *** results proved the effectiveness of metal-organic complexes in governing Li metal growth and can be employed as a new strategy for dendrite-free Li metal anode and safe Li metal batteries(LMBs).

关键词： Nickel(II)-dimethylglyoxime Nickel foam Metal-organic complex Uniform nucleation Dendrite-free

Radiation synthesis and characteristics of PTFE-g-PSSA ion exchange membrane applied in vanadium redox battery

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Nuclear Science and Techniques 2007年第1期18卷 50-54页

作者： PENG Jinfen QIU Jinyi NI Jiangfeng ZHAI Maolin XU Peng PENG Jing zhou henghui LI Jiuqiang WEI Genshuan Beijing National Laboratory for Molecular Sciences Department of Applied Chemistry College of Chemistry ＆ Molecular Engineering Peking University Beijing 100871 China

Radiation-induced grafting of styrene onto polytetrafluoroethylene (PTFE) membranes was studied by a simultaneous irradiation *** was carded out usingγ-radiation from a ^(60)Co source at room temperature. Effects of absorbed dose,atmosphere,dose rate,and the concentration of initial monomer on the degree of grafting (DOG) were investigated and the most appropriate grafting condition was ***,sulphonation of the grafted PTFE membrane (PTFE-g-PS) was carried out and a series of ion exchange membranes (PTFE-g-PSSA) was *** characterizations of FTIR,TGA,and SEM testified that grafting and sulphonation of the membranes were successfully processed;moreover,grafting of styrene not only occurred in the surface of PTFE membrane,but also in the micropores of the *** exchange capacity (IEC) and conductivity were found increase with the grafting *** results suggest that at a low dose,such as 17 kGy,the ion exchange membrane (IEM) which will be suitable for vanadium redox battery (VRB) use can be obtained.

关键词： PTFE-g-PSSA离子交换膜辐射合成性质钒氧化还原电池

Semi-interpenetrating-network all-solid-state polymer electrolyte with liquid crystal constructing efficient ion transport channels for flexible solid lithium-metal batteries

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Journal of Energy Chemistry 2022年第4期31卷 157-167页

作者： Qinghui Zeng Yu Lu Pingping Chen Zhenfeng Li Xin Wen Wen Wen Yu Liu Shuping Zhang Hailei Zhao henghui zhou Zhi-xiang Wang Liaoyun Zhang School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Pulead Technology Industry Co. LtdBeijing 102200China

The development of the solid-state polymer electrolytes (SPEs) for Li-ion batteries (LIBs) can effectively address the hidden safety issues of commercially used liquid ***,the unsatisfactory room temperature ion conductivity and inferior mechanical strength for linear PEO-based SPEs are still the immense obstacles impeding the further applications of SPEs for large-scale ***,we fabricate a series of semi-interpenetrating-network (semi-IPN) polymer electrolytes based on a novel liquid crystal (C6M LC) and poly(ethylene glycol) diglycidyl ether (PEGDE) via UV-irradiation at the first *** LCs not only highly improve the mechanical properties of electrolyte membranes via the construction of network structure with PEGDE,but also create stable ion transport channels for ion *** a result,a free-standing flexible SPE shows outstanding ionic conductivity(5.93×10^(-5) S cm^(-1) at 30℃),a very wide electrochemical stability window of 5.5 V,and excellent thermal stability at thermal decomposition temperatures above 360℃ as well as the capacity of suppressing lithium dendrite ***,the LiFePO_(4)/Li battery assembled with the semi-IPN electrolyte membranes exhibits good cycle performance and admirable reversible specific *** work highlights the obvious advantages of LCs applied to the electrolyte for the advanced solid lithium battery.

关键词： Solid-state polymer electrolyte Liquid crystal Semi-interpenetrating-network Ion transport channels Lithium battery

Leap of Li Metal Anodes from Coin Cells to Pouch Cells:Challenges and Progress

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Electrochemical Energy Reviews 2023年第1期6卷 39-86页

作者： Qian Wang Tiantian Lu Yuanbin Xiao Jianyang Wu Lixiang Guan Lifeng Hou Huayun Du Huan Wei Xiaoda Liu Chengkai Yang Yinghui Wei henghui zhou Yan Yu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Corrosion and Protection Engineering Technology Research Center of Shanxi Province Taiyuan 030024ShanxiChina Key Laboratory of Advanced Materials Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108FujianChina College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Li metal anodes have attracted tremendous attention in the last decade because of their high theoretical capacities and low electrochemical ***,until now,there has only been limited success in improving the interfacial and structural stabilities and in realizing the highly controllable and large-scale fabrication of this emerging material;these limitations have posed great obstacles to further performing fundamental and applied studies in Li metal *** this review,we focus on summarizing the existing challenges of Li metal anodes based on the leap from coin cells to pouch cells and on outlining typical methods for designing Li metal anodes on demand;we controllably engineer their surface protection layers and structure sizes by encapsulating structured Li metal inside a variety of synthetic protection *** aim to provide a comprehensive understanding and serve as a strategic guide for designing and fabricating practicable Li metal anodes for use in pouch *** and opportunities regarding this burgeoning field are critically evaluated at the end of this review.

关键词： Li metal anode Dendrites Pouch cells Air stability Energy density

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掺Cr对LiMnO_2的影响(英文)

稀有金属材料与工程 2004年第8期33卷 789-792页

作者：谷亦杰周恒辉常文保 Gu Yijie zhou henghui Chang Wenbao 北京大学北京100871 Peking University Beijing 100871China

采用固相反应合成了LiMnO2和LiMn0.9Cr0.1O2,Cr的加入改变了LiMnO2的结构,与LiMnO2 正交结构(空间群 Pmnm)相比,LiMn0.9Cr0.1O2具有单斜结构(空间群 C2/m)。充放电过程中,LiMnO2和LiMn0.9Cr0.1O2结构产生向尖晶石结构的不可逆转变。在... 详细信息

采用固相反应合成了LiMnO2和LiMn0.9Cr0.1O2,Cr的加入改变了LiMnO2的结构,与LiMnO2 正交结构(空间群 Pmnm)相比,LiMn0.9Cr0.1O2具有单斜结构(空间群 C2/m)。充放电过程中,LiMnO2和LiMn0.9Cr0.1O2结构产生向尖晶石结构的不可逆转变。在首次放电过程中,LiMnO2只存在2.9 V的电压平台,随着循环次数的增加,在2.9 V和4 V电压平台容量都有所增加。与LiMnO2不同,LiMn0.9Cr0.1O2在首次放电过程中存在有2.9 V和4 V电压平台,随着循环次数的增加,4 V电压平台容量逐渐减小,在一定循环次数下,只有2.9 V的电压平台存在。因此,Cr的掺杂不仅改变了LiMnO2的结构,而且改变其电化学行为。

关键词： LiMnO2 Cr掺杂电化学行为

Kinetics-controlled growth SnO2 nanorod arrays for superior rate performance of aligned mesocrystalline lithium-ion batteries with

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Nano Research 2013年第4期6卷 243-252页

作者： Shuai Chen Miao Wang Jianfeng Ye Jinguang Cai Yurong Ma henghui zhou Limin Qi Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of Chemistry Peking University Beijing 100871 China

A general method for facile kinetics-controlled growth of aligned arrays of mesocrystalline SnO2 nanorods on arbitrary substrates has been developed by adjusting supersaturation in a unique ternary solvent system comprising acetic acid, ethanol and water. The hydrolysis processes of Sn（IV） as well as the nucleation and growth of SnO2 crystals were carefully controlled in the mixed solvents, leading to an exclusively heterogeneous nucleation on a substrate and the subsequent growth into mesocrystalline nanorod arrays. In particular, aligned arrays of hierarchically structured, [001]-oriented mesocrystalline SnO2 nanorods with four {110} lateral facets can be readily grown on Ti foil as well as many other inert substrates such as fluoride-doped tin oxide （FTO）, Si, graphite, and polytetrafluoroethylene （Teflon）. Due to the unique combination of the mesocrystalline structure and the one-dimensional nanoarray structure, the obtained mesocrystalline SnO2 nanorod arrays grown on metallic Ti substrate exhibited an excellent rate performance with a high initial Coulombic efficiency of 65.6% and a reversible capacity of 720 mA.h/g at a charge/discharge rate of 10 C （namely, 7,820 mA/g） when used as an anode material for lithium-ion batteries.

关键词： tin dioxide nanostructures mesocrystals hierarchical structures lithium-ion batteries

Composite electrolyte with self-inserted structure and all-trans F conformation provides fast Li^(+) transport for solid-state Li metal batteries

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InfoMat 2024年第11期6卷 81-93页

作者： Ziyang Liang Chang Liu Xiang Bai Jiahui Zhang Xinyue Chang Lixiang Guan Tiantian Lu Huayun Du Yinghui Wei Qian Wang Tao Wei Wen Liu henghui zhou College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuanShanxithe People's Republic of China Shanxi Energy Internet Research Institute TaiyuanShanxithe People's Republic of China College of Chemistry and Molecular Engineering Peking UniversityBeijingthe People's Republic of China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiangthe People's Republic of China State Key Lab of Chemical Resource Engineering College of Science and College of Energy Beijing University of Chemical TechnologyBeijingthe People's Republic of China

Solid-state Li metal battery has attracted increasing interests for its potentiallyhigh energy density and excellent safety assurance, which is a promising candidatefor next generation battery system. However, the low ionic conductivityand Li^(+) transport number of solid-state polymer electrolytes limit their practicalapplication. Herein, a composite polymer electrolyte with self-insertedstructure is proposed using the layered double hydroxides (LDHs) as dopant toachieve a fast Li^(+) transport channel in poly(vinylidene-co-trifluoroethylene) [P(VDF-TrFE)] based polymer electrolyte. In such a composite electrolyte, P(VDF-TrFE) polymer has an all-trans conformation, in which all fluorineatoms locate on one side of the polymer chain, providing fast Li^(+) transporthighways. Meanwhile, the LDH can immobilize the anions of Li salts based onthe electrostatic interactions, promoting the dissociation of Li salts, therebyenhancing the ionic conductivity (6.4 × 10^(-4) S cm^(-1)) and Li^(+) transferencenumber (0.76). The anion immobilization effect can realize uniform electricfield distribution at the anode surface and suppress the dendritic Li ***, the hydrogen bonding interaction between LDH and polymerchains also endows the composite electrolyte with strong mechanical ***, at room temperature, the Li jj Li symmetric cells can be stablycycled over 1000 h at a current density of 0.2 mA cm^(-2), and the full cells withLiFePO_(4) cathode deliver a high capacity retention (>95%) after 200 cycles. This work offers a promising route to construct solid-state polymer electrolytes withfast Li^(+) transport.

关键词： LDH Li metal batteries Li^(+) transport channel P(VDF-TrFE) solid-state polymer electrolytes