Lithium-sulfur(Li-S) battery is regarded as one of the most fascinating candidates for energy storage due to its dominant advantage of high energy density.However,the shuttling effect of soluble polysulfides and low e...Lithium-sulfur(Li-S) battery is regarded as one of the most fascinating candidates for energy storage due to its dominant advantage of high energy density.However,the shuttling effect of soluble polysulfides and low electrical conductivity of sulfur and Li_(2)S still hinder its commercialization.In this work,high electrical-conductive carbon nanofibers(CNFs) with uniformly embedded polytungstates(HPW@CNFs) are proposed for advanced Li-S batteries.H_(3)PW_(12)O_(40)(HPW) is a kind of molecular nano-sized metal cluster which contains rich Lewis acid/base sites that can stabilize polysulfide effectively through chemical bonding,while CNFs play the role of physical barriers for polysulfides and transmission channel for electrons.The HPW@CNFs/S cathode shows an ultra-stable cycling performance with extremely small decay rate of 0.015% per cycle over 400 cycles at 0.5 C.展开更多
Equipped with highest-energy density anode,lithium metal batteries are of great interests for the nextgeneration energy storage systems.However,the existing problems like uneven Li deposition,large volume expansion an...Equipped with highest-energy density anode,lithium metal batteries are of great interests for the nextgeneration energy storage systems.However,the existing problems like uneven Li deposition,large volume expansion and short cycling lifespan severely retard the implementation of Li metal anodes.Herein,we report an in-situ formed Cu_(x)O nanofiber network synthesized by facile and scalable calcination process and employ as stable lithium metal anode.The CuO/Cu_(2)O ratio in the lithiophilic Cu_(x)O network can be adjusted through an optimal annealing time,thus guiding the homogeneous distribution of Li atoms and regulating the repeated plating/stripping processes.As a result,Li@Cu_(x)O 3D scaffold displays an ultralow overpotential of 7.7 mV,long cycling life for more than 1000 h in symmetric cell,and exceptional stability for LiFePO_(4)//Li full cells.This work provides guidelines for the design and fabrication of lithiophilic 3D matrixes and advances the practical use of lithium metal batteries.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.51874360)the Program of Huxiang Young Talents(Grant No.2019RS2002)+1 种基金the Innovation-Driven Project of Central South University(2020CX027)the Recruitment Program of Global Youth Experts。
文摘Lithium-sulfur(Li-S) battery is regarded as one of the most fascinating candidates for energy storage due to its dominant advantage of high energy density.However,the shuttling effect of soluble polysulfides and low electrical conductivity of sulfur and Li_(2)S still hinder its commercialization.In this work,high electrical-conductive carbon nanofibers(CNFs) with uniformly embedded polytungstates(HPW@CNFs) are proposed for advanced Li-S batteries.H_(3)PW_(12)O_(40)(HPW) is a kind of molecular nano-sized metal cluster which contains rich Lewis acid/base sites that can stabilize polysulfide effectively through chemical bonding,while CNFs play the role of physical barriers for polysulfides and transmission channel for electrons.The HPW@CNFs/S cathode shows an ultra-stable cycling performance with extremely small decay rate of 0.015% per cycle over 400 cycles at 0.5 C.
基金supported by the Guangdong Basic and Applied Basic Research Foundation(2019A1515012111)the Science and Technology Innovation Commission of Shenzhen(JCYJ20180507181858539 and JCYJ20190808173815205)+1 种基金the National Key R&D Program of China(2019YFB2204500)the Shenzhen Science and Technology Program(KQTD20180412181422399)。
文摘Equipped with highest-energy density anode,lithium metal batteries are of great interests for the nextgeneration energy storage systems.However,the existing problems like uneven Li deposition,large volume expansion and short cycling lifespan severely retard the implementation of Li metal anodes.Herein,we report an in-situ formed Cu_(x)O nanofiber network synthesized by facile and scalable calcination process and employ as stable lithium metal anode.The CuO/Cu_(2)O ratio in the lithiophilic Cu_(x)O network can be adjusted through an optimal annealing time,thus guiding the homogeneous distribution of Li atoms and regulating the repeated plating/stripping processes.As a result,Li@Cu_(x)O 3D scaffold displays an ultralow overpotential of 7.7 mV,long cycling life for more than 1000 h in symmetric cell,and exceptional stability for LiFePO_(4)//Li full cells.This work provides guidelines for the design and fabrication of lithiophilic 3D matrixes and advances the practical use of lithium metal batteries.
