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Fast thermal responsive separators toward long-life and safe lithium metal batteries

Nano Research 2024年第4期17卷 2746-2754页

作者： Pingan Li Zhifang Liu Yitong Peng Shanshan Yang Tao Meng Yunhuan hu Yingjun Jiang Hao Sun Qi Li xianluo hu State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Lithium metal batteries(LMBs)have been extensively investigated during the past decades because of their ultrahigh energy *** the increasing demand for energy density,however,the safety issue of LMBs has become a significant *** particular,localized areas of increased temperature(namely,hotspots)may be induced and even exacerbated within LMBs by uneven current distribution,internal short circuits,or inadequate heat dissipation,which significantly sacrifices battery safety and cycle ***,we report the rational design and fabrication of a fast thermal responsive separator capable of inhibiting the growth of lithium dendrites and mitigating thermal propagation,thereby reducing the risk of thermal *** as-achieved separator comprises both an electrospun membrane using a phase change material with superior thermal-storage ability and a thermally conductive modification layer of hexagonal boron nitride nanosheets with a fast heat-transfer *** is demonstrated that such a unique integration of heat conduction and heat storage enables the functional separator with attractive abilities to mitigate hotspots and inhibit the growth of lithium dendrites upon the cycling of ***,pouch cells with the thermal-responsive separator,as well as numerical simulations,verify much enhanced safety and cycle life of *** work may offer a new conceptual design of intelligent separators that acts as a functional unit encapsulated within a single cell to boost in-situ thermal management,which will help to develop high-safety and energy-dense LMBs.

关键词： lithium metal batteries separators hotspots safety thermal management

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Interface engineering by gelling sulfolane for durable and safe Li/LiCoO_(2) batteries in wide temperature range

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Science China Materials 2022年第11期65卷 2967-2974页

作者： Xinrun Yu xianluo hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Lithium-metal batteries(LMBs)with high energy densities have aroused intensive interest in electrical energy storage devices but suffer from the risk of thermal runaway,especially under harsh conditions of high temperature or thermal *** intrinsically thermally stable electrolytes with higher performance and higher safety beyond commercial liquid electrolytes is a major challenge in this *** we report on a unique,highly durable sulfolanebased gel electrolyte constructed by a facile gelling *** method takes advantages of thermotolerant sulfolane as a plasticizer and strong dipole-dipole interactions to achieve the gelation of polymer polyvinylidene fluoride/polyethylene *** systematically investigated the influence of gelled sulfolane on gel formation,lithium plating/stripping,and solid electrolyte *** from favorable interface engineering,the sulfolane-based gel electrolyte remarkably enhances the cyclic and safety performances of *** used in the Li/LiCoO_(2) battery,the resulting gel electrolyte enables long-term cycling stability at high temperatures up to 90°***,the thermal safety of practical Li/LiCoO_(2) pouch cells(up to 190°C)has also been demonstrated by accelerating rate *** results contribute to the development of high-safety LMBs that require abuse tolerance,high energy,and long calendar life.

关键词： lithium-metal batteries gel electrolytes solid electrolyte interphases thermal safety accelerating rate calorimetry

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Dual surface/bulk engineering of Nb_(2)O_(5) for high-rate sodium storage

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Electron 2023年第2期1卷 73-81页

作者： Yingjun Jiang xianluo hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

Orthorhombic Nb_(2)O_(5) is a highly promising fast-charging anode material for sodium-ion ***,its poor intrinsic electronic/ionic conductivity limits its ***,we developed a one-step heat treatment method to create an N-doped carbon coating on the outside and S-doped Nb_(2)O_(5) on the inside(CN-SCN).Ionic liquids are used as the source of C/N/S,which synergistically enhance the surface and bulk electronic/ionic *** N-doped carbon coating on the surface exhibits excellent electronic conductivity and a low ion-diffusion barrier,thanks to the high nitrogen ratio and extremely low content(<2 wt%).Auger electron spectroscopy analysis confirms that S atoms detach from the carbon chain of the ionic liquids and enter the bulk Nb_(2)O_(5),resulting in S-doped Nb_(2)O_(5),significantly facilitating reaction *** CN-SCN electrodes exhibit outstanding rate capability,achieving a capacity of up to 94 mAh g^(−1) even at a high current rate of 50 *** paired with activated carbon as the positive electrode,the sodium-ion capacitor with the CN-SCN anode exhibits a high-energy density of up to 59 Wh kg^(−1) and a long cycle life with 73%capacity retention after 10,000 *** work opens up possibilities for low-cost and large-scale production of high-rate Nb_(2)O_(5) for sodium-storage applications.

关键词： fast reaction kinetics ionic liquids orthorhombic Nb_(2)O_(5) sodium-ion capacitors

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Highly efficient H-bonding charge-transfer complex for microsupercapacitors under extreme conditions of low temperatures

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Journal of Energy Chemistry 2020年第12期29卷 182-189页

作者： Libin Wang Ting Shu Songtao Guo Shi Chen Yingjun Jiang xianluo hu State Key Laboratory of Materials Processing and Die Sf Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Owing to sluggish ionic mobility at low temperatures, supercapacitors, as well as other energy-storage devices, always suffer from severe capacity decay and even failure under extreme low-temperature circumstances. Solar-thermal-enabled self-heating promises an attractive approach to overcome this ***, we report a unique H-bonding charge-transfer complex with a high photothermal conversion efficiency of 79.5% at 405 nm based on chloranilic acid and albendazole. Integrated with a microsupercapacitor, the chloranilic acid-albendazole complex(CAC) film prompts an apparent temperature increase of 22.7 °C under 1 sun illumination at-32.6 °C, effectively elevating the working temperature of *** a result, the rate capability of the microsupercapacitor has been significantly improved with a 17-fold increase in capacitance at a current density of 60 μA cm^(-2), leading to outstanding low-temperature performances. Importantly, the integrated device is capable of working at a low temperature of-30 °C in the open air, which demonstrates the potential of CAC in practical applications for low-temperature ultracapacitive energy-storage devices.

关键词： Charge-transfer complexes Solar-thermal conversion Extreme conditions Microsupercapacitors Low temperature

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Safer Lithium-Ion Batteries from the Separator Aspect:Development and Future Perspectives

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Energy & Environmental Materials 2021年第3期4卷 336-362页

作者： Zhifang Liu Yingjun Jiang Qiaomei hu Songtao Guo Le Yu Qi Li Qing Liu xianluo hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

With the rapid development of lithium-ion batteries(LIBs),safety problems are the great obstacles that restrict large-scale applications of LIBs,especially for the high-energy-density electric vehicle *** component materials(e.g.,cathode,anode,electrolyte,and separator)with high thermal stability and intrinsic safety is the ultimate solution to improve the safety of *** are crucial components that do not directly participate in electrochemical reactions during charging/discharging processes,but play a vital role in determining the electrochemical performance and safety of *** this review,the recent advances on traditional separators modified with ceramic materials and multifunctional separators ranging from the prevention of the thermal runaway to the flame retardant are *** component–structure–performance relationship of separators and their effect on the comprehensive performance of LIBs are discussed in ***,the research challenges and future directions toward the advancement in separators for high-safety LIBs are also proposed.

关键词： energy storage high safety lithium-ion batteries separators thermal stability

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Boosting lithium batteries under harsh operating conditions by a resilient ionogel with liquid-like ionic conductivity

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Journal of Energy Chemistry 2021年第11期30卷 408-414,I0009页

作者： Le Yu Qing Liu Libin Wang Songtao Guo Qiaomei hu Yaqian Li Xiwei Lan Zhifang Liu xianluo hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazlwng University of Science and TechnologyWuhan 430074HubeiChina

New chemistries are being developed to increase the capacity and power of rechargeable batteries. However, the risk of safety issues increases when high-energy batteries using highly active materials encounter harsh operating conditions. Here we report on the synthesis of a unique ionogel electrolyte for abuse-tolerant lithium batteries. A hierarchically architected silica/polymer scaffold is designed and fabricated through a facile soft chemistry route, which is competent to confine ionic liquids with superior uptake ability (92.4 wt%). The monolithic ionogel exhibits high conductivity and thermal/mechanical stability, featuring high-temperature elastic modulus and dendrite-free lithium cycling. The Li/LiFePO_(4) pouch cells achieve outstanding cyclability at different temperatures up to 150 ℃, and can sustain cutting, crumpling, and even coupled thermal–mechanical abuses. Moreover, the solid-state lithium batteries with LiNi_(0.60)Co_(0.20)Mn_(0.20)O_(2), LiNi_(0.80)Co_(0.15)Al_(0.05)O_(2), and Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2) cathodes demonstrate excellent cycle performances at 60 ℃. These results indicate that the resilient and high-conductivity ionogel electrolyte is promising to realize high-performance lithium batteries with high energy density and safety.

关键词： Ionogel electrolytes Lithium batteries Safety Harsh operating conditions Cyclability

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Lithium-ion insertion kinetics of Na-doped Li2TiSiO5 as anode materials for lithium-ion batteries

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Journal of Materials Science & Technology 2020年第22期54卷 18-25页

作者： Yueni Mei Yuyu Li Fuyun Li Yaqian Li Yingjun Jiang Xiwei Lan Songtao Guo xianluo hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Li2TiSiO5 receives much interest recently in lithium-ion battery anodes because of its attractive Liinsertion/extraction potential at 0.28 V(vs. Li+/Li), which bridges the potential gap between graphite and Li4 Ti5 O12. However, Li2TiSiO5 suffers from the low intrinsic electronic conductivity and sluggish Liion transfer kinetics. In this work, we report lithium-ion insertion kinetics of Li2TiSiO5 by Na doping,achieving high-rate capability. Rietveld refinement of X-ray diffraction results reveals that Na doping can enlarge the space of Li slabs, thus reducing the Li-ion transfer barrier and enhancing the Li-ion diffusion kinetics. According to first-principles calculations, Na doping can tune the band structure of Li2TiSiO5 from indirect to direct band, leading to improved electronic conductivity and electrochemical performance. In particular, the Na-doped Li2TiSiO5(Li1.95 Na(0.05)TiSiO5) electrode exhibits outstanding rate capability with a high capacity of 101 m A h g^(-1) at 5 A g^(-1) and superior cyclability with a reversible capacity of 137 m A h g^(-1) under 0.5 A g^(-1) over 150 cycles.

关键词： Lithium-ion batteries Li2TiSiO5 Anode Lithium-ion diffusion Na doping

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Morphology-controllable solvothermal synthesis of nanoscale LiFePO_4 in a binary solvent

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Chinese Science Bulletin 2012年第32期57卷 4170-4175页

作者： WU Miao WANG Zhaohui YUAN LiXia ZHANG WuXing hu xianluo huANG Yunhui State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Scienee and EngineeringHuazhong University of Science and TechnologyWuhan 430000China

LiFePO4(LFP) nanobars,microplates and nanorods have been selectively synthesized via a solvothermal method in a water-ethylene glycol(EG) binary solvent with H3PO4,LiOH·H2O,and FeSO4·7H2O as starting *** morphology and size of the as-obtained LFP products can be deliberately controlled by varying the volume ratio of EG to *** formation mechanism and electrochemical properties of different LFP morphologies have been *** carbon coating,the Li-ion diffusion coefficients of LFP nanorods,nanobars and micro-plates are 2.58×10-9,2.91×10-10,and 7.22×10-10 cm2 s-1,*** the carbon-coated nanorods,excellent rate capability and cyclability were *** 5 C,the capacity was 141 mAh g-1 for the first cycle and maintained 120 mAh g-1 after 100 cycles;at 10 C,the capacity was still as high as 132 mAh g-1.

关键词：溶剂热合成磷酸铁锂二元溶剂纳米级电化学性能可控形貌循环性能

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Fabricating low-temperature-tolerant and durable Zn-ion capacitors via modulation of co-solvent molecular interaction and cation solvation

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Science China Materials 2021年第7期64卷 1609-1620页

作者： Fuyun Li Le Yu Qiaomei hu Songtao Guo Yueni Mei Qing Liu Yapeng He xianluo hu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Aqueous Zn-based energy-storage devices have aroused much interest in recent ***,uncontrollable dendrite growth in the Zn anode significantly limits their cycle ***,the poor low-temperature performance arising from the freezing of aqueous electrolytes at sub-zero temperatures restricts their practical applications in cold ***,we fabricated low-temperature-tolerant and durable Zn-ion hybrid supercapacitors(ZHSCs)via modulating a co-solvent water/ethylene glycol *** interaction of intermolecular hydrogen bonds between water and ethylene glycol as well as cation solvation was systematically investigated by tuning the co-solvent *** results illustrate that the ZnSO_(4)/water/ethylene glycol(65%)electrolyte possesses high ionic conductivity at low temperatures and effectively prevents the dendrite formation of the Zn *** as-fabricated ZHSCs exhibit long-term cyclability and are capable of working at sub-zero temperatures as low as -40℃.The present ZHSCs are anti-freezing and cost-effective,which may find new applications in the fields of next-generation electrochemical energy storage devices.

关键词： low temperature co-solvent electrolyte Zn-ion capacitors ionic conductivity rational modulation

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Flexible fiber-shaped supercapacitors based on hierarchically nanostructured composite electrodes

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Nano Research 2015年第4期8卷 1148-1158页

作者： Henghui Xu xianluo hu Yongming Sun huiling Yang Xiaoxiao Liu Yunhui huang State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering HuazhongUniversity of Science and Technology Wuhan 430074 China

A novel all-solid-state, coaxial, fiber-shaped asymmetric supercapacitor has been fabricated by wrapping a conducting carbon paper on a MnO2-modified nanoporous gold wire. This energy wire exhibits high capacitance of 12 ***^-2 and energy density of 5.4 μ***^-2 with excellent cycling stability. Hierarchical nanostructures and coaxial architectural design facilitate effective contacts between the two core@sheath electrodes and active layers with high flexibility and high performance. This work provides the first example of coaxial fiber- shaped asymmetric supercapacitors with an operation voltage of 1.8 V, and holds great potential for future flexible electronic devices.

关键词： all-solid-state energy storage flexible device hierarchical nanostructure supercapacitors

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