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Simultaneously tailoring material structure and surface for robust sodium storage:A case study of TiO_(2)

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Journal of Materials Science & Technology 2023年第5期136卷 91-96页

作者： Zhenzhu Wang Feng Yang jiangfeng ni Liang Li School of Physical Science and Technology Center for Energy Conversion Materials&Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China Department of Chemistry Guangdong Provincial Key Laboratory of CatalysisSouthern University of Science and TechnologyShenzhen 518055China

Modulating the atomic structure and surface property represents a pivotal and intriguing approach to tai-loring the energy storage performance of battery materials,but their simultaneous modulation via simple processes remains a grand challenge.Taking TiO_(2)as an example,here we report the structure and sur-face modulation through a simple two-step operation,hydrogenation and fluorination,which impart high electrical conductivity and robust surface activity to the material.Hydrogenation introduces Ti^(3+)species in the TiO_(2)bulk to accelerate electron transport,while surface fluorination speeds up sodium-ion reaction dynamics.This modulated TiO_(2)exhibits robust Na+storage,affording 181 mAh g^(−1)over 2500 cycles at a high rate of 20 C.In addition,when paring with a commercial Na_(3)V_(2)(PO_(4))2 O_(2)F cathode,the designated TiO_(2)allows the full cell to deliver a remarkable power of 3700 W kg^(−1),outperforming most sodium-ion batteries.The correlation between the robust performance and the material property is understood through energy band analysis and density functional theory calculations.

关键词： Sodium-ion battery Titanium dioxide Fluorination Electrochemical performance Rate capability

Electrospun Materials for Batteries Moving Beyond Lithium‑Ion Technologies

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Electrochemical Energy Reviews 2022年第2期5卷 211-241页

作者： Jie Wang Zhenzhu Wang jiangfeng ni Liang Li School of Physical Science and Technology Center for Energy Conversion Materials and Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006JiangsuChina Light Industry Institute of Electrochemical Power Sources Suzhou 215699JiangsuChina

Innovation and optimization have shifted battery technologies beyond the use of lithium ions and fostered the demand for enhanced materials,which are vital factors determining the energy,power,durability,and safety of systems.Current battery materials vary in their sizes,shapes,and morphology,and these have yet to meet the performance standards necessary to prevent deterioration in regard to the efficiency and reliability of beyond-lithium technologies.As a versatile and feasible technique for producing ultrathin fibers,electrospinning has been extensively developed to fabricate and engineer nanofibers of functional materials for battery applications.In this review,the basic concepts and characteristics of beyond-lithium batteries are expounded,and the fundamentals of electrospinning are reviewed.The aim is to provide a guide to researchers going into this field.Focuses are placed on how electrospinning can address some of the key technical challenges facing beyond-lithium technologies.We hope the knowledge presented in this work will stimulate the design of electrospun materials for future battery applications.

关键词： Electrospinning Electrospun material Beyond-lithium battery Nanofiber

Review:Multiple Functionalities of Aqueous Zinc-Ion Batteries

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Journal of Harbin Institute of Technology(New Series) 2022年第6期29卷 101-110页

作者： Sheng Zhu jiangfeng ni Institute of Molecular Science Shanxi UniversityTaiyuan 030006China School of Physical Science and Technology Soochow UniversitySuzhou 215006JiangsuChina

Aqueous zinc-ion batteries are a kind of attractive power supply devices due to their high energy, environmental benignity, and intrinsic safety. In recent years, tremendous enthusiasm has been devoted to the functionalities of aqueous zinc-ion batteries, aiming to extend their potential applications in multiple dimensions and multiple scales. Here, the latest advances in the design, construction, and performance evaluation of aqueous zinc-ion batteries are summarized. The focus is on various functionalities such as flexibility, self-healing, self-charging, and miniaturization. We also highlight the materials and structures that have been engineered to realize these functionalities. Finally, we offer some general insights into the challenges and chances in such exciting field.

关键词： zinc-ion battery multiple functionalities flexibility self-healing self-charging integration

Multiscale assembly of polyoxometalates:From clusters to materials

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ChemPhysMater 2023年第1期2卷 20-29页

作者： Boyuan Yu Xin Zhao jiangfeng ni Feng Yang Department of Chemistry Guangdong Provincial Key Laboratory of CatalysisSouthern University of Science and TechnologyShenzhen 518055China School of Physical Science and Technology Center for Energy Conversion Materials&Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China

Polyoxometalates(POMs)have drawn broad and intense interest due to their unique structure-dependent prop-erties.The assembly of POM molecules into nanoarchitectures and superstructures can bridge the gap between micro-molecule and bulk POM materials and integrate the merits of molecule and materials that are widely used in catalysis,energy conversion,electronics,and bioapplications.The synthetic methodologies and applications of multiscale POM assemblies have been widely studied.In this review,we survey the POM-based multiscale assembly focusing on two aspects:the strategies for multiscale assembly of POMs and the emerging applications of POM assemblies.For the multiscale assembly,we focus on the methods of POMs assembly including templated synthesis and self-and co-assembly of POMs into nanoarchitectures and superstructures.For the applications,we review the applications of POM assemblies in energy,catalysis,and functional materials.Finally,we present the prospects for the future synthetic design and applications of POM assemblies.

关键词： Polyoxometalates Clusters Hybrids Host-guest chemistry Multiscale assembly

Jahn-Teller Effect Directed Bandgap Tuning of Birnessite for Pseudocapacitive Application

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Energy & Environmental Materials 2023年第3期6卷 222-228页

作者： Sheng Zhu Yuechao Wang Jinshu Zhang Jian Sheng Feng Yang Meng Wang jiangfeng ni Hong Jiang Yan Li Beijing National Laboratory for Molecular Sciences Key Laboratory for the Physics and Chemistry of NanodevicesState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Institute of Molecular Science Key Laboratory of Chemical Biology and Molecular Engineering of Education MinistryShanxi UniversityTaiyuan 030006China Beijing National Laboratory for Molecular Sciences Institute of Theoretical and Computational ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School of Physical Science and Technology Center for Energy Conversion Materials&Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China

Birnessite M_(x)MnO_(2)(M=Na^(+),K^(+),etc.)has emerged as a promising alternative to the classical MnO_(2)material owing to its improved pseudocapacitive performance for energy storage.Understanding their structure–property correlation is essential for the development and application of advanced supercapacitors.Herein,we adopt the crystal field theory and density functional simulation to reveal the structural dependence of the pseudocapacitive property of M_(x)MnO_(2).Attributing to the Jahn–Teller effect of Mn^(3+),the bandgap of Kx MnO_(2)can be tuned by changing the x value(i.e.,the Mn(III)/Mn(IV)ratio).Then,we design a narrow-bandgap K 0.25 MnO_(2)(0.84 eV),which affords a high capacitance of 415 F g^(-1)at 1 A g^(-1)and a desirable rate capability of 293 F g^(-1)at 20 A g^(-1).Operando Raman spectroscopy confirms that the Jahn–Teller induced structure evolution of[MnO_(6)]octahedron accounts for the superior pseudocapacitive behavior of K_(0.25)MnO_(2).This finding offers theoretical guidance to the design and application of birnessite materials for pseudocapacitors.

关键词： birnessite charge storage Jahn–Teller effect manganese dioxide supercapacitor

Carbon nanotube-based electrodes for flexible supercapacitors

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Nano Research 2020年第7期13卷 1825-1841页

作者： Sheng Zhu jiangfeng ni Yan Li Beijing National Laboratory far Molecular Sciences Key Laboratory for the Physics and Chemistry of NanodevicesState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School of Physical Science and Technology Center far Energy Conversion Materials&Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China

Flexible supercapacitors(SCs)have attracted increasing attention as the power supply unit for portable/wearable electronics.Carbon nanotubes(CNTs)are promising candidate materials for flexible SC electrodes because of their outstanding mechanical property,high electrical conductity,large surface area,and functionability.CNTs can assemble into various macroscopic materials with different dimensions.In this review,flexible CNT assemblies including 1D fibers,2D films,and 3D aerogels and sponges are introduced with a focus on the design strategies and fabrication techniques.The recent developments and state-of-the-art applications of such structures as electrodes in flexible SCs are summarized based on device configurations including sandwiched,interdigital in-plane,and cable-type configurations.The flexible CNT-based electrodes have shown great advantages in bendability,stretchability and/or compresisbility,as well as a long cycle lifetime.The current challenges and future research opportunities in this field are also discussed.

关键词： carbon nanotubes nanostructures electrodes flexible supercapacitors

Carbon nanotubes for flexible batteries: recent progress and future perspective

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National Science Review 2021年第5期8卷 158-174页

作者： Sheng Zhu Jian Sheng Yuan Chen jiangfeng ni Yan Li Beijing National Laboratory for Molecular Sciences Key Laboratory for the Physics and Chemistry of NanodevicesState Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking University School of Chemical and Biomolecular Engineering The University of Sydney School of Physical Science and Technology Center for Energy Conversion Materials & Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow University Light Industry Institute of Electrochemical Power Sources

Flexible batteries, which maintain their functions potently under various mechanical deformations, attract increasing interest due to potential applications in emerging portable and wearable electronics. Significant efforts have been devoted to material synthesis and structural designs to realize the mechanical flexibility of various batteries. Carbon nanotubes(CNTs) have a unique one-dimensional(1 D) nanostructure and are convenient to further assemble into diverse macroscopic structures, such as 1 D fibers, 2 D films and 3 D sponges/aerogels. Due to their outstanding mechanical and electrical properties, CNTs and CNT-based hybrid materials are superior building blocks for different components in flexible batteries. This review summarizes recent progress on the application of CNTs in developing flexible batteries, from closed-system to open-system batteries, with a focus on different structural designs of CNT-based material systems and their roles in various batteries. We also provide perspectives on the challenges and future research directions for realizing practical applications of CNT-based flexible batteries.

关键词： carbon nanotube flexible battery electrochemical energy storage wearable electronics

Freestanding nanosheets of 1T-2H hybrid MoS_(2) as electrodes for efficient sodium storage

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Journal of Materials Science & Technology 2021年第8期67卷 237-242页

作者： Haiyang Yu Zhenzhu Wang jiangfeng ni Liang Li School of Physical Science and Technology Center for Energy Conversion Materials&PhysicsJiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China

Molybdenum disulfide(MoS_(2)) is a promising electrode material for sodium-ion batteries as it offers a large capacity through a distinct conversion reaction.However,the electrochemical potential of MoS_(2) is often restrained by the poor conductivity as the dominant 2 H phase is a semiconductor while the metallic1 T phase is thermodynamically unstable.In this work,we report a hybrid design and material preparation of freestanding nanosheets of MoS_(2) composed of both 1 T and 2 H phases based on mild hydrothermal reaction.The introduction of the metallic 1 T-MoS_(2) phase into 2 H-MoS_(2) and their intimate hybridization enable a significant improvement in electronic conductivity,while the freestanding architecture avoids possible electrochemical aggregation.When used as electrodes for sodium storage,such a hybrid MoS_(2) affords a high capacity of~500 mA h g^(-1) at 0.5 A g^(-1) after 300 cycles,and retains capacity of~200 mA h g^(-1) at a high current rate of 4 A g^(-1),thus demonstrating their potential in high-performance battery applications.

关键词： Molybdenum disulfide Sodium-ion battery Hybrid Finite element modeling

Nature-inspired Cu2O@CoO tree-like architecture for robust storage of sodium

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Journal of Materials Science & Technology 2020年第18期52卷 126-131页

作者： Zhenzhu Wang Menglei Sun jiangfeng ni Liang Li School of Physical Science and Technology Center for Energy Conversion Materials fy Physics(CECMP)Jiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China

We report a nature-inspired design of tree-like architecture of cuprous oxide(Cu2O)stem and cobalt oxides(CoO)branch serving as an efficient anode for sodium-ion batteries.The construction of stembranch architectures involves the growth of Cu2O nanorods and the subsequent deposition of CoO nanowires.Due to abundant active sites and full exposure to electrolyte,such a Cu2O@CoO stem-branch architecture demonstrates a robust storage toward Na^+ions,affording a capacity retention of^100%over 300 continuous cycles and a remarkable rate capability of 296 mAh g^-1 at 1 A g^-1.This result clearly shows the potential of nature-inspired materials engineering may find extensive applications in the design of high-performance electrodes for rechargeable batteries.

关键词： Nature-inspired design Architecture Cuprous oxide Sodium-ion battery