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Progress in Gel Polymer Electrolytes for Sodium-Ion Batteries

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Energy & Environmental Materials 2023年第4期6卷 355-383页

作者： Jinyun Zheng Wenjie Li Xinxin Liu Jiawei Zhang xiangming feng Weihua Chen Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001China

Sodium-ion battery is a potential application system for large-scale energy storage due to the advantage of higher nature abundance and lower production cost of sodium-based materials.However,there exist inevitably the safety problems such as flammability due to the use of the same type of organic liquid electrolyte with lithium-ion battery.Gel polymer electrolytes are being considered as an effective solution to replace conventional organic liquid electrolytes for building safer sodium-ion batteries.In this review paper,the authors present a comprehensive overview of the research progress in electrochemical and physical properties of the gel polymer electrolyte-based sodium batteries.The gel polymer electrolytes based on different polymer hosts namely poly(ethylene oxide),poly(acrylonitrile),poly(methyl methacrylate),poly(vinylidene fluoride),poly(vinylidene fluoride-hexafluoro propylene),and other new polymer networks are summarized.The ionic conductivity,ion transference number,electrochemical window,thermal stability,mechanical property,and interfacial issue with electrodes of gel polymer electrolytes,and the corresponding influence factors are described in detail.Furthermore,the ion transport pathway and ion conduction mechanism are analyzed and discussed.In addition,the advanced gel polymer electrolyte systems including flame-retardant polymer electrolytes,composite gel polymer electrolytes,copolymerization,single-ion conducting polymer electrolytes,etc.with more superior and functional performance are classified and summarized.Finally,the application prospects,development opportunities,remaining challenges,and possible solutions are discussed.

关键词： cycling performance gel polymer electrolyte ion conduction safety sodiumion battery

Boosting rate and cycling performance of K-doped Na_(3)V_(2)(PO_(4))_(2)F_(3) cathode for high-energy-density sodium-ion batteries

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Green Energy & Environment 2022年第6期7卷 1253-1262页

作者： Jiexin Zhang YangYang Lai Peng Li Yanxia Wang Faping Zhong xiangming feng Weihua Chen Jianjun Liu Xinping Ai Hanxi Yang Yuliang Cao Engineering Research Center of Organosilicon Compounds&Materials of Ministry of Education College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China National Engineering Research Center of Advanced Energy Storage Materials Hunan410205China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou450001China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences1295 Dingxi RoadShanghai200050China

As a promising cathode material,Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF)has attracted wide attention for sodium-ion batteries(SIBs)because of its high operating voltage and high structural stability.However,the low intrinsic electronic conductivity and insufficient Na ion mobility of NVPF limit its development.Herein,K-doping NVPF is prepared through a facile ball-milling combined calcination method.The effects of K-doping on the crystal structure,kinetic properties and electrochemical performance are investigated.The results demonstrate that the Na_(2.90)K_(0.10)V_(2)(PO_(4))_(3)F_(3)(K0.10-NVPF)exhibits a high capacity(120.8 mAh g^(-1) at 0.1 C),high rate capability(66 mAh g^(-1) at 30 C)and excellent cycling performance(a capacity retention of 97.5%at 1 C over 500 cycles).Also,the occupation site of K ions in the lattice,electronic band structure and Na-ion transport kinetic property in K-doped NVPF are investigated by density functional theory(DFT)calculations,which reveals that the K-doped NVPF exhibits improved electronic and ionic conductivities,and located K^(+) ions in the lattice to contribute to high reversible capacity,rate capability and cycling stability.Therefore,the K-doped NVPF serves as a promising cathode material for high-energy and high-power SIBs.

关键词： Potassium doping Na_(3)V_(2)(PO_(4))_(2)F_(3) Cathode materials Sodium ion batteries Long-term stability

Carbon coated ultrasmall anatase TiO_2 nanocrystal anchored on N,S-RGO as high-performance anode for sodium ion batteries

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Green Energy & Environment 2018年第3期3卷 277-285页

作者： Lingfei Zhao Tong Tang Weihua Chen xiangming feng Liwei Mi College of Chemistry and Molecular Engineering Zhengzhou University Center for Advanced Materials Research Zhongyuan University of Technology

Anatase TiO_2 has been investigated as one of the most promising anode materials for sodium ion batteries(SIBs)with low cost and high theoretical capacity.Herein,a composite material of TiO_2 /N,S-RGO@C with carbon coated ultrasmall anatase TiO_2 anchored on nitrogen and sulfur co-doped RGO matrix was successfully prepared by a rational designed process.The composite structure exhibited ultrasmall crystal size,rich porous structure,homogeneous heteroatoms doping and thin carbon coating,which synergistically resulted in elevated electron and ion transfer.The anode exhibited high rate capacities with good reversibility under high rate cycling.The carbon coating was investigated to be effective to prevent active material falling and lead to long term cycling performance with a high capacity retention of 181 m Ah g^(à1)after 2000cycles at 2 C.Kinetic studies were carried out and the results revealed that the superior performance of the composite material were derived from the decreased charge transfer resistance and elevated ion diffusion.Results suggested that the TiO_2 /N,S-RGO@C composite is a promising anode material for sodium ion batteries.

关键词： Titanium dioxide Nitrogen/sulfur doping RGO Sodium ion battery Long cycle life

Hierarchical porous onion-shaped LiMn204 as cathode material for lithium ion batteries

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Nano Research 2018年第8期11卷 4038-4048页

作者： Zihe Li xiangming feng Liwei Mi Jinyun Zheng Xiaoyang Chen Weihua Chen College of Chemistry and Molecular Engineering Zhengzhou University Zhengxhou 45000 I China Center for Advanced Materials Research Zhongyuan University of Technology Zhengzhou 450007 China National Engineering and Research Center for Adv. Polymer Processing Technology Zhengzhou University Zhengzhou 450001 China

Spinel niMn2O4 is a widely utilized cathode material for Li-ion batteries. However, its applications are limited by its poor energy density and power density. Herein, a novel hierarchical porous onion-like LiMn204 （LMO） was prepared to shorten the Li diffusion pathway with the presence of uniform pores and nanosized primary particles. The growth mechanism of the porous onion-like LiMn204 was analyzed to control the morphology and the crystal structure so that it forms a polyhedral crystal structure with reduced Mn dissolution. In addition, graphene was added to the cathode （LiMn2Odgraphene） to enhance the electronic conductivity. The synthesized LiMn2O4/graphene exhibited an ultrahigh-rate performance of 110.4 rnAh.g-1 at 50 C and an outstanding energy density at a high power density maintaining 379.4 Wh.kg-1 at 25,293 W.kg-L Besides, it shows durable stability, with only 0.02% decrease in the capacity per cycle at 10 C. Furthermore, the （LiMn2O4/graphene）/graphite full-cell exhibited a high discharge capacity. This work provides a promising method for the preparation of outstanding, integrated cathodes for potential applications in lithium ion batteries.

关键词： KEYWORDSLiMn2O4 hierarchical porous shape cathode rate performance Li-ion batteries

Facile synthesis of hierarchical Na2Fe(SO4)2@rGO/C as high-voltage cathode for energy density-enhanced sodium-ion batteries

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Journal of Energy Chemistry 2020年第11期29卷 387-394页

作者： Ge Yao Xixue Zhang Yongliang Yan Jiyu Zhang Keming Song Juan Shi Liwei Mi Jinyun Zheng xiangming feng Weihua Chen Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina Center for Advanced Materials Research Zhongyuan University of TechnologyZhengzhou 450007HenanChina

Fe-based sulfates are ideal cathode candidates for sodium-ion batteries(SIBs) owing to their high operating voltage and low cost but suffer from the nature of poor power performance. Herein, a hierarchical porous Na2Fe(SO4)2@reduced graphene oxide/carbon dot(Na2Fe(SO4)2@rGO/C) with low carbon content(4.12 wt%) was synthesized via a facile homogeneous strategy benefiting for engineering application,which delivers excellent sodium storage performance(high voltage plateau of 3.75 V, 85 m Ah g-1 and330 Wh kg-1 at 0.05 C;5805 W kg-1 at 10 C) and high Na+diffusion coefficient(1.19 × 10-12 cm2 s-1).Moreover, the midpoint voltage of assembled full cell could reach 3.0 V. The electron transfer and reaction kinetics are effectively boosted since the nanoscale Na2Fe(SO4)2 is supported by a robust crosslinked carbon matrix with rGO sheets and carbon dots. The slight rGO sheets sufficiently enhance the electron transfer like a current collecter and restrain the aggregation, as well as ensure smooth ion channels. Meanwhile, the carbon dots in the whole space connect with Na2Fe(SO4)2 and help rGO to promote the conductivity of the electrode. Ex-situ X-ray powder diffraction and X-ray photoelectron spectrometry analysis confirm the high reversibility of this sodiation/desodiation process.

关键词： Sodium ion batteries High-voltage cathode Fe-based sulfates Full cell Hierarchical structure

An advanced low-cost cathode composed of graphene-coated Na_(2.4)Fe_(1.8)(SO_(4))_(3) nanograins in a 3D graphene network for ultra-stable sodium storage

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Journal of Energy Chemistry 2021年第3期30卷 564-570页

作者： Yongjin Fang Qi Liu xiangming feng Weihua Chen Xinping Ai Liguang Wang Liang Wang Zhiyuan Ma Yang Ren Hanxi YangYuliang Cao College of Chemistry and Molecular Sciences Engineering Research Center of Organosilicon Compounds&Materials of Ministry of EducationWuhan UniversityWuhan 430072HubeiChina Department of Physics City University of Hong KongTat Chee AvenueKowloonHong KongChina College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001HenanChina X-ray Science Division Advanced Photon SourceArgonne National Laboratory9700 South Cass AvenueLemontIL 60439USA

Iron-based electrodes have attracted great attention for sodium storage because of the distinct cost effectiveness.However,exploring suitable iron-based electrodes with high power density and long duration remains a big challenge.Herein,a spray-drying strategy is adopted to construct graphene-coated Na_(2.4)Fe_(1.8)(SO_(4))_(3) nanograins in a 3D graphene microsphere network.The unique structural and compositional advantages endow these electrodes to exhibit outstanding electrochemical properties with remarkable rate performance and long cycle life.Mechanism analyses further explain the outstanding electrochemical properties from the structural aspect.

关键词： Na_(2.4)Fe_(1.8)(SO_(4))_(3) Polyanions Spray-drying Cathode Sodium-ion batteries

Amorphous NaVOPO_(4)as a High-Rate and Ultrastable Cathode Material for Sodium-Ion Batteries

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CCS Chemistry 2021年第10期3卷 2428-2436页

作者： Yongjin Fang Jiexin Zhang Faping Zhong xiangming feng Weihua Chen Xinping Ai Hanxi Yang Yuliang Cao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072 2National Engineering Research Center of Advanced Energy Storage Materials Changsha 410205 3College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001

The low cost and profusion of sodium resources make sodium-ion batteries(SIBs)a potential alternative to lithium-ion batteries for grid-scale energy storage applications.However,the use of conventional cathode materials for Na-ion intercalation/deintercalation cannot satisfy the requirements of high-powered and long lifespan performance due to multiphase transition and lattice confinement.

关键词： amorphous NaVOPO_(4) cathod e materials polyanion single-phase-like mechanism sodium-ion batteries

Enabling an intrinsically safe and high-energy-density 4.5 V-class Li-ion battery with nonflammable electrolyte

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InfoMat 2020年第5期2卷 984-992页

作者： Ziqi Zeng Xingwei Liu Xiaoyu Jiang Zhenjie Liu Zhangquan Peng xiangming feng Weihua Chen Dingguo Xia Xinping Ai Hanxi Yang Yuliang Cao Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhanChina State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilinChina College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhouChina Key Lab of Theory and Technology for Advanced Batteries Materials College of EngineeringPeking UniversityBeijingChina

Developing nonflammable electrolyte with a wide electrochemical window has become an urgent demand for high-energy-density and high-safe lithium-ion batteries(LIBs).Herein,a fluorinated nonflammable phosphate electrolyte is developed to construct a safe 4.5 V-class LIB(Si-SiC-C/0.35Li2MnO3-0.65LiNi0.5Mn0.5O2).The proposed fluorinated phosphate electrolyte,0.8 M LiPF6/tris(2,2,2-trifluoroethyl)phosphate(TFEP)+5 vol%fluoroethylene carbonate(FEC)+5 vol%vinylene carbonate(VC),is not only completely nonflammable but also exhibits excellent oxidative/reductive stability on 0.35Li2MnO30.65LiNi0.5Mn0.5O2 cathode and Si-SiC-C anode.The in situ differential electrochemical mass spectrometry and X-ray photoelectron spectroscopy proved that TFEP-based electrolyte does not decompose into gases but forms a high-quality electrode-electrolyte interface on cathode surface at high working potential.The 4.5 V-class LIBs using 0.8 M LiPF6 TFEP-based nonflammable electrolyte shed some light on potential application for high-safe and low-cost larger-scale energy storage.

关键词： high energy density lithium-ion battery nonflammable electrolyte safety

Synthesis and Electrochemical Performance of LiMnPO4 Cathode Material for Lithium Ion Battery by Solvothermal

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Synthesis and Electrochemical Performance of LiMnPO4 Cathode...