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nano Research 2024年第1期17卷 221-227页

作者： Yu Zhang Shuting Zhang Mengwei Yuan Yufeng Li Rong Liu caiyun nan Chen Chen Engineering Research Center of Advanced Rare Earth Materials Department of ChemistryTsinghua UniversityBeijing 100084China Beijing Key Laboratory of Energy Conversion and Storage Materials Institution College of ChemistryBeijing Normal UniversityBeijing 100875China X-ray diffraction Lab Analytical and Testing CenterBeijing Normal UniversityBeijing 100875China

Co_(3)O_(4) is considered as one of promising cathode catalysts for lithium oxygen(Li-O_(2))batteries,which contains both tetrahedral Co^(2+)sites(Co^(2+)Td)and octahedral Co^(3+)sites(Co^(3+)Oh).It is important to reveal the effect of optimal geometric configuration and oxidation state of cobalt ion in Co_(3)O_(4) to improve the performance of Li-O_(2) ***,through regulating the synthesis process,Co^(2+)and Co^(3+)sites in Co_(3)O_(4) were replaced with Zn and Al atoms to form materials with a unique Co *** Li-O_(2) batteries based on ZnCo_(2)O_(4) showed longer cycle life than that of CoAl_(2)O_(4),suggesting that in Co_(3)O_(4),the Co^(3+)Oh site is a relatively better geometric configuration than Co^(2+)Td site for Li-O_(2) *** calculations revealed that Co^(3+)Oh sites provide higher catalysis activity,regulating the adsorption energy of the intermediate LiO_(2) and accelerating the kinetics of the reaction in batteries,which further leads to the change of the morphology of the discharge product and ultimately improves the electrochemical performance of the batteries.

关键词： lithium oxygen(Li-O_(2))batteries geometrical configuration oxidation state lithium peroxide

Coupling interface constructions of hollow Co-Mo mixed multiple oxidation states heterostructure for high-performance aprotic Li-O_(2) battery

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nano Research 2024年第5期17卷 4100-4107页

作者： Xingzi Zheng Mengwei Yuan Jingshen Xu Zihan Li caiyun nan Genban Sun Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Center for Advanced Materials Research Beijing Normal UniversityZhuhai 519087China

Constructing interfaces in heterostructures is effective for modulating the electronic properties of *** hollow CoMoO_(4)-Co_(3)O_(4) heterostructure(HCMCH)was prepared as a bifunctional electrocatalyst for Li-O_(2) *** different components in CoMoO_(4)-Co_(3)O_(4) heterostructure presented the efficient coupling and enhanced the electrocatalytic activity for aprotic oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),in which it improved the obviously reduced overpotential of 300 mV(compared with the pure Ketjen black(KB)electrode),enhanced reversibility of 80%capacity retention after 6 full cycles and the superior cyclability of more than 200 cycles with an optimized *** battery performance of the HCMCH was not only associated with the unique hollow structure and rich active sites but also with coupling interface constructions synergetic effects attaching to the improving conductivity and optimized the discharge *** results suggested that this HCMCH electrocatalyst was a promising candidate for the Li-O_(2) battery and it gave a novel insight for high performance electrocatalyst designing.

关键词： Li-oxygen battery heterostructure electrocatalyst coupling interface

Atomically Dispersed Ruthenium Catalysts with Open Hollow Structure for Lithium-Oxygen Batteries

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nano-Micro Letters 2024年第2期16卷 154-164页

作者： Xin Chen Yu Zhang Chang Chen Huinan Li Yuran Lin Ke Yu caiyun nan Chen Chen Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Solid State ChemistryUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China Engineering Research Center of Advanced Rare Earth Materials Department of ChemistryTsinghua UniversityBeijing 100084People’s Republic of China Beijing Key Laboratory of Energy Conversion and Storage Materials Institution College of ChemistryBeijing Normal UniversityBeijing 100875People’s Republic of China

Lithium–oxygen battery with ultrahigh theoretical energy density is considered a highly competitive next-generation energy storage device,but its practical application is severely hindered by issues such as difficult decomposition of discharge products at ***,we have developed N-doped carbon anchored atomically dispersed Ru sites cathode catalyst with open hollow structure(h-RuNC)for Lithium–oxygen *** one hand,the abundance of atomically dispersed Ru sites can effectively catalyze the formation and decomposition of discharge products,thereby greatly enhancing the redox *** the other hand,the open hollow structure not only enhances the mass activity of atomically dispersed Ru sites but also improves the diffusion efficiency of catalytic ***,the excellent activity from atomically dispersed Ru sites and the enhanced diffusion from open hollow structure respectively improve the redox kinetics and cycling stability,ultimately achieving a high-performance lithium–oxygen battery.

关键词： Atomically dispersed Open hollow structure Discharge product Lithium Oxygen battery

Ultralong cycle life enabled by in situ growth of CoMo_(1-x)P/Mo heterostructure for lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第10期31卷 5-12,I0001页

作者： Donghua Guo Mengwei Yuan Xingzi Zheng Miaomiao Li caiyun nan Genban Sun Xianqiang Huang Huifeng Li Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry&Chemical EngineeringLiaocheng UniversityLiaocheng 252059ShandongChina Department of Physics and Applied Optics Beijing Area Major Laboratory Beijing Normal UniversityBeijing 100875China

Lithium-sulfur batteries(Li-S batteries) are considered as promising new-generation electrochemical energy storage devices due to their extremely high theoretical energy density(2600 Wh kg-1) and theoretical specific capacity(1675 m Ah g^(-1)). However, numerous problems such as poor conductivity and the shuttle effect during discharge-charge process limit the practical application of lithium-sulfur batteries. In this work, porous tubular Co Mo_(1-x)P/Mo constructed by in situ growth of metal Mo was designed as the sulfur host for lithium-sulfur batteries. The introduction of Mo modulated the electronic structure of Co Mo P to improve the conductivity of cathode and facilitate the redox kinetics, as well as the Co Mo_(1-x)P/Mo heterostructure was beneficial to inhibit the shuttle effect through the interaction with lithium polysulfides, which improved cycling stability. As a result, Co Mo_(1-x)P/Mo/S cathode had a low-capacity decay rate of only 0.029% per cycle after 2000 cycles at 0.5 C. This work provided a new perspective for the further design of high-performance lithium-sulfur battery cathode materials.

关键词： Metal phosphide Heterostructure Long cycle Shuttle effect Li-S batteries

Hollow catalysts through different etching treatments to improve active sites and oxygen vacancies for high-performance Li-O_(2)battery

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nano Research 2023年第5期16卷 6798-6804页

作者： Jiachen Qiu Yuran Lin Shuting Zhang Jie Ma Yu Zhang Mengwei Yuan Genban Sun caiyun nan Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Center for Advanced Materials Research Beijing Normal UniversityZhuhai 519087China Department of Chemistry Tsinghua UniversityBeijing 100084China

Li-O_(2)batteries are regarded as one of the most promising next-generation battery systems due to their high theoretical energy density,finding effective cathode catalysts with fine-tuned structure is a key way to improve the ***,based on the structure of cubic zeolitic imidazolate framework-67(ZIF-67),a series of hollow catalysts were synthesized by different chemical etching ***,from the perspective of metal,nickel nitrate is used for etching,hollow Ni ZIF is obtained through Kirkendall ***,hollow TA-ZIF is obtained by adding tannic acid to replace the methylimidazole *** structures have larger surface areas,materials can expose more active sites,which can lead to better performance of Li-O_(2)*** this basis,having more oxygen vacancies can also improve the battery *** the same time,further loading noble metal ruthenium on the synthesized cobalt-based catalyst can effectively reduce the overpotential of Li-O_(2)battery and improve the battery *** TA-ZIF with more stable hollow structure and more oxygen vacancies,the cycle performance reaches 330 cycles after loading *** with the 64 cycles of solid Co_(3)O_(4),it has a great improvement.

关键词： hollow structure active sites oxygen vacancies noble metal cathode catalyst Li-O_(2)battery

Self-Catalyzed Rechargeable Lithium-Air Battery by in situ Metal Ion Doping of Discharge Products: A Combined Theoretical and Experimental Study

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Energy & Environmental Materials 2023年第1期6卷 129-137页

作者： Mengwei Yuan Zemin Sun Han Yang Di Wang Qiming Liu caiyun nan Huifeng Li Genban Sun Shaowei Chen Beijing Key Laboratory of Energy Conversion and Storage Materials Institution College of ChemistryBeijing Normal UniversityBeijing 100875China Department of Physics and Applied Optics Beijing Area Major Laboratory Beijing Normal UniversityBeijing 100875China Department of Chemistry and Biochemistry University of California1156 High StreetSanta Cruz CA 95064USA

Lithium-air battery has emerged as a viable electrochemical energy technology;yet a substantial overpotential is typically observed,due to the insulating nature of the discharge product Li_(2)O_(2) that hinders the reaction kinetics and device ***,finite solid–solid/-liquid interfaces are formed between Li_(2)O_(2) and catalysts and limit the activity of the electrocatalysts in battery reactions,leading to inadequate electrolytic ***,in-situ doping of Li_(2)O_(2) by select metal ions is found to significantly enhance the lithium-air battery performance,and Co^(2+)stands out as the most effective dopant among the *** is ascribed to the unique catalytic activity of the resulting Co-O_(x) sites towards oxygen electrocatalysis,rendering the lithium-air battery self-catalytically *** studies based on density functional theory calculations show that structural compression occurs upon Co^(2+)doping,which lowers the energy barrier of Li_(2)O_(2) *** from this study highlight the significance of in situ electrochemical doping of the discharge product in enhancing the performance of lithium-air battery.

关键词： Co^(2+)-doped Li_(2)O_(2) density functional theory,in situ electrochemical doping lithium-air battery self-catalysis

Ultrathin hexagonal boron nitride as a van der Waals,force initiator activated graphene for engineering efficient non-metal electrocatalysts of Li-CO_(2) battery

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nano Research 2022年第2期15卷 1171-1177页

作者： Zemin Sun Di Wang Liu Lin Yuhui Liu Mengwei Yuan caiyun nan Huifeng Li Genban Sun Xiaojing Yang Beijing Key Laboratory of Energy Conversion and Storage Materials Institution College of ChemistryBeijing Normal UniversityBeijing 100875China

Reasonably regulating electronic coupling to promote charge transfer and exciton separation has been regarded a promising approach in *** material engineering of van der Waals heterojunction(vdWsH)based on two-dimensional(2D)materials would be a potential way to optimize the as-prepared extrinsic physicochemical ***,it was still an almost uncultivated land waiting for exploration in ***,we introduced the inert h-boron nitride(h-BN)in non-metal reduced graphene oxide(GN)catalysts and constructed BN-GN *** theoretical calculation demonstrated that the h-BN can effectively modify the electronic properties of *** the introduction of h-BN,the BN-GN vdWsH can obviously enhance the catalytic activity of Li-CO_(2) *** existence of BN-GN vdWsH can reduce the overpotential more than 700 mV compared with reduced graphene oxide during the CO_(2) reduction reaction(CO_(2)RR)and CO_(2) evolution reaction(CO_(2)ER),and it extended cyclic stability more than three times,which was one structure design made it work as a high efficient electrocatalyst,catalytic materials.

关键词： van der Waals heterojunction(vdWsH) Li-CO_(2)battery boron nitride-graphene oxide vdWsH non-metal catalysis

Li Ion Exchanged a-MnO2 N anowires as Efficient Catalysts for Li-O2 Batteries

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Chemical Research in Chinese Universities 2020年第6期36卷 1261-1264页

作者： MA Jie ZHANG Yu YUAN Mengwei nan caiyun College of Chemistry Beijing Normal UniversityBeijing 100875P.R.China

Due to the limited energy densities,which could be achieved by lithium-ion cells,Li-O2 batteries,which could provide a promising super energy storage medium,attract much attention *** its high activity,high storage and low cost,Mn-based oxides have shown versatile application in various *** enhance the cyclability of Li-O2 batteries,here,we synthesized a kind of a-MnO2 nanowires as a bifunctional catalyst for Li-O2 *** particular structure of a-MnO2 reduces the mass transfer resistance of the battery,and the MnO2 nanowires were ion ex-changed by saturated lithium sulfate solution so as to further improve the performance of the *** exchanged a-MnO2 catalyst showed a high discharge specific capacity(6243 mA·h/g at a current density of 200 mA/g)and signifi-cantly improved the cyclability up to the 55th cycle(200 mA/g with capacity of 1000 mA h/g).The results show that the Li ion exchange method is a promising strategy for improving the performance of MnO2 catalyst for Li-O2 batteries.

关键词： MnO2 nanowire Electrocatalyst lon exchange Li-O2 battery

Flexible SnS nanobelts： Facile synthesis, formation mechanism and application in Li-ion batteries

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nano Research 2013年第1期6卷 55-64页

作者： Jun Lu caiyun nan Lihong Li Qing Peng Yadong Li DepartmentofChemistry Tsinghua University Beijing 100084 China State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua University Beijing 100084 China

[020]-oriented tin sulfide nanobelts with a length/thickness ratio of 100 have been synthesized by a facile hydrothermal method without any surfactants, and the nanobelts have shown good strain-accommodating properties as well as good electrochemical performance as the anode for Li-ion batteries. The formation of the nanobelts results from a precipitation-dissolution-transformation mechanism, and the [020] oriented growth can be ascribed to the {010} facet family having the lowest atomic density. In particular, SnS shows clear Li-Sn alloying/de-alloying reversible reactions in the potential range 0.1–1.0 V. Based on galvanostatic measurements and electrochemical impedance spectroscopy, SnS nanobelts have shown impressive rate performance. The post-cycled SnS nanobelts were completely transformed into metallic tin, and preserved the one-dimensional structure due to their flexibility which accommodates the large volumetric expansion.

关键词：锂离子电池水热法合成纳米带 SNS 形成机理表面活性剂柔性应用

Size and shape control of LiFePO4 nanocrystals for better lithium ion battery cathode materials

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nano Research 2013年第7期6卷 469-477页

作者： caiyun nan Jun Lu Lihong Li Lingling Li Qing Peng Yadong Li Department of Chemistry State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua University 8eijing 100084 China

Lithium iron phosphate （LiFePO4） is a potential high efficiency cathode material for lithium ion batteries, but the low electronic conductivity and single diffusion channel for lithium ions require good particle size and shape control during the synthesis of this material. In this paper, six LiFePO4 nanocrystals with different size and shape have been successfully synthesized in ethylene glycol. The addition sequence Fe-PO4-Li helps to form LiFePO4 nanocrystals with mostly {010} faces exposed, and increasing the amount of LiOH leads to a decrease in particle size. The electrochemical performance of the six distinct LiFePO4 particles show that the most promising LiFePO4 nanocrystals either have predominant {010} face exposure or high specific area, with little iron（II） oxidation.

关键词： LiFePO4 nanocrystals size and shape control lithium ion battery rate capability