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Modification strategies of Li_(7)La_(3)Zr_(2)O_(12) ceramic electrolyte for high-performance solid-state batteries

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Tungsten 2021年第3期3卷 260-278页

作者： Jian-Shuai Lv Shao-Ke Guo yan-bing he Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China

Enormous research focusing on solid-state electrolyte promotes the development of solid-state *** to lithium-ion batteries using liquid electrolyte,the solid-state batteries feature the hi gh energy density and non-flammability,which accelerates the revolution in portable electronics and ***-type Li_(7)La_(3)Zr_(2)O_(12)(LLZO)solid-state electrolyte is considered as the promising solid-state electrolyte due to high ionic conductivity,Li transference number and shear ***,surface contaminant and poor contact with lithium inhibit its practical application in lithium metal *** review provides a brief introduction about structure and properties of ***,we conclude the modification strategies for increasing ionic conductivity,enhancing interfacial contact and inhibiting lithium *** last,the challenge and perspectives are discussed for development of LLZO in solid-state batteries.

关键词： Li_(7)La_(3)Zr_(2)O_(12) Surface contaminant Elemental doping Interface modification Structure design Tungsten

An ultrathin and continuous Li_4Ti_5O_(12) coated carbon nanofiber interlayer for high rate lithium sulfur battery

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Journal of Energy Chemistry 2019年第4期28卷 19-26页

作者： Decheng An Lu Shen Danni Lei Lehong Wang heng Ye Baohua Li Feiyu Kang yan-bing he Engineering Laboratory for the Next Generation Power and Energy Storage Batteries Graduate School at Shenzhen Tsinghua University Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University

Severe capacity fading and poor high rate performance of lithium sulfur(Li–S) battery caused by "shuttle effect" and low conductivity of sulfur hampers its further developments and applications. Li_4Ti_5O_(12) (LTO)possesses high lithium ion conductivity, and it is also can be used as an active adsorbent for polysulfide. herein, fine LTO particle coated carbon nanofibers(CNF) were prepared and a conductive network both for electron and lithium ion was built, which can greatly promote the electrochemical conversion of polysulfide and improve the rate performance of Li–S batteries. Meanwhile, a quantity of adsorption sites is constructed by defects of the surface of LTO-CNF membrane to effectively immobilize polysulfide. The multifunctional LTO-CNF interlayer could impede the shuttle effect and enhance comprehensive electrochemical performance of Li–S batteries, especially high rate performance. With such LTO-CNF interlayer,the Li–S battery presents a specific capacity of 641.9 mAh/g at 5 C rate. After 400 cycles at 1 C, a capacity of 618.0 mAh/g is retained. This work provides a feasible strategy to achieve high performance of Li–S battery for practical utilization.

关键词： Lithium sulfur batteries Li4Ti5O12 (LTO) Interlayer Polysulfide adsorbent Polysulfide conversion

Progress and perspective of Li_(1+x)Al_(x)Ti_(2-x)(PO_(4))_(3) ceramic electrolyte in lithium batteries

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InfoMat 2021年第11期3卷 1195-1217页

作者： Ke yang Likun Chen Jiabin Ma yan-bing he Feiyu Kang Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center Tsinghua Shenzhen International Graduate SchoolInstitute of Materials Research(IMR)ShenzhenChina School of Materials Science and Engineering Tsinghua UniversityBeijingChina

The replacement of liquid organic electrolytes with solid-state electrolytes(SSEs)is a feasible way to solve the safety issues and improve the energy density of lithium *** SSEs materials that can well match with high-voltage cathodes and lithium metal anode is quite significant to develop high-energy-density lithium ***_(1+x)Al_(x)Ti_(2-x)(PO_(4))_(3)(LATP)SSE with NASICON structure exhibits high ionic conductivity,low cost and superior air stability,which enable it as one of the most hopeful candidates for all-solidstate batteries(ASSBs).However,the high interfacial impedance between LATP and electrodes,and the severe interfacial side reactions with the lithium metal greatly limit its applications in *** review introduces the crystal structure and ion transport mechanisms of LATP and summarizes the key factors affecting the ionic *** side reaction mechanisms of LATP with Li metal and the promising strategies for optimizing interfacial compatibility are *** also summarize the applications of LATP including as surface coatings of cathode particles,ion transport network additives and inorganic fillers of composite polymer *** last,this review proposes the challenges and the future development directions of LATP in SSBs.

关键词： crystal structure interfaces ionic conductivity Li_(1+x)Al_(x)Ti_(2-x)(PO_(4))_(3) lithium batteries

In-situ polymerized cross-linked binder for cathode in lithium-sulfur batteries

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Chinese Chemical Letters 2020年第2期31卷 570-574页

作者： heng Ye Danni Lei Lu Shen Bin Ni Baohua Li Feiyu Kang yan-bing he Shenzhen Geim Graphene Center Graduate School at ShenzhenTsinghua UniversityShenzhen 518055China Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Volume expansion and polysulfide shuttle effect are the main barriers for the commercialization of lithium-sulfur(Li-S) *** this work,we in-situ polymerized a cross-linked binder in sulfur cathode to solve the aforementioned problems using a facile method under mild *** diol(PCDL),triethanolamine(TEA) and hexamethylene diisocyanate(HDI) were chosen as precursors to prepare the cross-linked *** in-situ polymerized binder(PTH) builds a strong network in sulfur cathode,which could restrain the volume expansion of sulfu ***,by adopting functional groups of oxygen atoms and nitrogen atoms,the binder could effectively facilitate transportation of Li-ion and adsorb polysulfide *** Li-S battery with bare sulfur and carbon/sulfur composite cathodes and cross-linked PTH binder displays much better electrochemical performance than that of the battery with *** PTH-bare S cathode with a mass loading of 5.97 mg/cm^2 could deliver a capacity of 733.3 mAh/g at 0.2 C,and remained 585.5 mAh/g after 100 *** in-situ polymerized binder is proved to be quite effective on restraining the volume expansion and suppressing polysulfide shuttle effect,then improving the electrochemical performance of Li-S battery.

关键词： Cross-linked binder In-situ polymerization Volume expansion of sulfur Shuttle effect suppression Lithium-sulfur batteries

Progress and perspectives of in situ polymerization method for lithium-based batteries

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Interdisciplinary Materials 2023年第4期2卷 609-634页

作者： Guanyou Xiao Hao Xu Chen Bai Ming Liu yan-bing he Institute of Materials Research(IMR) Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenChina

The application of lithium-based batteries is challenged by the safety issues of leakage and flammability of liquid *** electrolytes(PEs)can address issues to promote the practical use of lithium metal ***,the traditional preparation of PEs such as the solution-casting method requires a complicated preparation process,especially resulting in side solvents evaporation *** large thickness of traditional PEs reduces the energy density of the battery and increases the transport bottlenecks of ***,it is difficult to fill the voids of electrodes to achieve good contact between electrolyte and *** situ polymerization appears as a facile method to prepare PEs possessing excellent interfacial compatibility with ***,thin and uniform electrolytes can be *** interfacial impedance can be reduced,and the lithium-ion transport throughput at the interface can be *** typical in situ polymerization process is to implant a precursor solution containing monomers into the cell and then in situ solidify the precursor under specific initiating conditions,and has been widely applied for the preparation of PEs and battery *** this review,we focus on the preparation and application of in situ polymerization method in gel polymer electrolytes,solid polymer electrolytes,and composite polymer electrolytes,in which different kinds of monomers and reactions for in situ polymerization are *** addition,the various compositions and structures of inorganic fillers,and their effects on the electrochemical properties are ***,challenges and perspectives for the practical application of in situ polymerization methods in solid-state lithium-based batteries are reviewed.

关键词： in situ polymerization interface compatibility lithium-based batteries polymer electrolytes

Radiochemical separation of thorium from ^(18)O inducedreaction with natural uranium

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Nuclear Science and Techniques 2001年第2期12卷 81-86页

作者： yanG Wei-Fan, YUAN Shuang-Gui, XIONG bing, XU yan-bing, he Jian-Jun, PAN Qiang-yan, MA Tao-Tao Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000 中科院近代物理所甘肃兰州 730000

A radiochemical procedure used to separate and purify trace concentration thorium produced in heavy ion reaction with uranium targets is presented. The procedure can rapidly yield thorium fraction suitable for gamma-ray spectroscopy studies. The resultant gamma-ray spectra showed that Th was isolated from a large number of elements produced in the reaction, and there were only a few contaminating activities of isotopes of Sc, Cd, In, etc. The decontamination factors for the main reaction products are given.

关键词：钍放射化学分离天然铀

Grain boundaries contribute to highly efficient lithium-ion transport in advanced LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)secondary sphere with compact structure

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SusMat 2021年第2期1卷 255-265页

作者： Cheng Liu heyi Xia Yinping Wei Jiabin Ma Lin Gan Feiyu Kang yan-bing he Shenzhen Geim Graphene Center Institute of Materials Research(iMR)Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenP.R.China

LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2)(NCA)secondary particles with high tap density have a great potential for high volumetric energy density lithium(Li)-ion power ***,the ionic conductivity mechanism of NCA with compact structure is still a suspense,especially the function of grain ***,we sys-tematically investigate the Li-ion transport behavior in both the primitive NCA(PNCA)secondary sphere densely grown by single-crystal primary grains and ball-milled NCA(MNCA)nanosized particle to reveal the role of grain bound-aries for Li-ion *** PNCA and MNCA have comparable Li-ion dif-fusion coefficients and rate ***,the graphene nanosheet conductive additive only mildly affects the Li-ion diffusion in PNCA cathode,while which severely blocks the Li-ion transport in MNCA *** high-resolution transmission electron microscopy and electron energy loss spec-troscopy,we clearly observe Li-ion depletion at lower state of charge(SOC)and Li-ion aggregation at high SOC along the grain boundaries of PNCA secondary particles during high-rate lithiation *** grain boundaries can construct an interconnected Li-ion transport network for highly efficient Li-ion transport,which contributes to excellent high-rate performance of compact PNCA sec-ondary *** findings present new strategy and deep insight in design-ing compact materials with excellent high-rate performance.

关键词： compact structure grain boundaries graphene nanosheet LiNi_(0.8)Co_(0.15)Al_(0.05)O_(2) lithium-ion transport

Progress and perspective of the cathode/electrolyte interface construction in all-solid-state lithium batteries

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Carbon Energy 2021年第6期3卷 866-894页

作者： Shiming Su Jiabin Ma Liang Zhao Kui Lin Qidong Li Shasha Lv Feiyu Kang yan-bing he Shenzhen Geim Graphene Center International Graduate School at ShenzhenTsinghua UniversityShenzhenChina Laboratory of Advanced Materials School of Materials Science and EngineeringTsinghua UniversityBeijingChina Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijingChina

Security risks of flammability and explosion represent major problems with the use of conventional lithium rechargeable batteries using a liquid *** application of solid-state electrolytes could effectively help to avoid these safety ***,integrating the solid-state electrolytes into the all-solid-state lithium batteries is still a huge challenge mainly due to the high interfacial resistance present in the entire battery,especially at the interface between the cathode and the solid-state electrolyte pellet and the interfaces inside the ***,recent progress made from investigations of cathode/solid-state electrolyte interfacial behaviors including the contact problem,the interlayer diffusion issue,the space-charge layer effect,and electrochemical compatibility is presented according to the classification of oxide-,sulfide-,and polymer-based solid-state *** also propose strategies for the construction of ideal next-generation cathode/solid-state electrolyte interfaces with high room-temperature ionic conductivity,stable interfacial contact during long cycling,free formation of the space-charge region,and good compatibility with high-voltage cathodes.

关键词： cathode configuration design interface lithium battery solid-state electrolyte

Ultrafast presodiation of graphene anodes for high-efficiency and high-rate sodium-ion storage

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InfoMat 2021年第12期3卷 1445-1454页

作者： Ganyu Zheng Qiaowei Lin Jiabin Ma Jun Zhang yan-bing he Xian Tang Feiyu Kang Wei Lv Quan-Hong yang Shenzhen Geim Graphene Center Engineering Laboratory for Functionalized Carbon MaterialsTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenChina School of Chemical Engineering The University of New South WalesSydneyNew South WalesAustralia Shenzhen Key Laboratory of Information Science and Technology Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenChina Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjinChina

The low initial Coulombic efficiency(ICE)is a significant problem hindering the practical uses of carbon anodes in sodium-ion batteries(SIBs),especially for the carbons with large surface *** is an effective way to solve the above problem,but it always needs complicated operations and cannot suppress the unavoidable electrolyte decomposition in the assembled ***,we develop an ultrafast chemical presodiation method for reduced graphene oxide(rGO)using sodium naphthalene(Na-Nt)dissolved in dimethoxyethane(DME)solvent as a presodiation *** presodiation effectively improves the ICE of rGO to 96.8%and forms an artificial solid electrolyte interphase(SEI)on its surface due to the decomposition of the formed complex between Na+and *** formed artificial SEI suppresses the excessive decomposition of electrolytes in the assembled battery,leading to a formation of uniform and inorganic component–rich SEI on rGO surface,which enables a rapid interfacial ion ***,the presodiated rGO showed excellent rate performance with a high capacity of 198.5 mAh g^(-1) at 5 A g^(-1).Moreover,excellent cycle stability indicated by the high capacity retention of 68.4%over 1000 cycles was also achieved,showing the poten-tial to promote the practical uses of high-rate rGO anode in SIBs.

关键词： high rate initial Coulombic efficiency presodiation sodium-ion batteries solid electrolyte interphase