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Outstanding Lithium Storage Performance of a Copper-Coordinated Metal-Covalent Organic Framework as Anode Material for Lithium-Ion Batteries
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作者 Derong Luo huizi zhao +5 位作者 Feng Liu Hai Xu Xiaoyu Dong Bing Ding Hui Dou Xiaogang Zhang 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第5期29-36,共8页
Metal-covalent organic frameworks(MCOF)as a bridge between covalent organic framework(COF)and metal organic framework(MOF)possess the characteristics of open metal sites,structure stability,crystallinity,tunability as... Metal-covalent organic frameworks(MCOF)as a bridge between covalent organic framework(COF)and metal organic framework(MOF)possess the characteristics of open metal sites,structure stability,crystallinity,tunability as well as porosity,but still in its infancy.In this work,a covalent organic framework DT-COF with a keto-enamine structure synthesized from the condensation of 3,3'-dihydroxybiphenyl diamine(DHBD)and triformylphloroglucinol(TFP)was coordinated with Cu^(2+)by a simple post-modification method to a obtain a copper-coordinated metal-covalent organic framework of Cu-DT COF.The isomerization from a keto-enamine structure of DT-COF to a enol-imine structure of Cu-DT COF is induced due to the coordination interaction of Cu^(2+).The structure change of Cu-DT COF induces the change of the electron distribution in the Cu-DT COF,which greatly promotes the activation and deep Li-storage behavior of the COF skeleton.As anode material for lithium-ion batteries(LIBs),Cu-DT COF exhibits greatly improved electrochemical performance,retaining the specific capacities of 760 mAh g^(-1)after 200 cycles and 505 mAh g^(-1)after 500 cycles at a current density of 0.5 A g^(-1).The preliminary lithium storage mechanism studies indicate that Cu^(2+)is also involved in the lithium storage process.A possible mechanism for Cu-DT COF was proposed on the basis of FT-IR,XPS,EPR characterization and electrochemical analysis.This work enlightens a novel strategy to improve the energy storage performance of COF and promotes the application of COF and MCOF in LIBs. 展开更多
关键词 anode material copper-coordination lithium-ion batteries metal-covalent organic frameworks
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湖南民间蓝印花布图案的叙事特征 被引量:1
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作者 陈剑 赵慧子 《民艺》 2022年第2期23-27,共5页
湖南民间蓝印花布图案多为具有吉祥意义的祥禽瑞兽、人物故事、花草鸟蝶,从叙事的角度来看,它们通过一定的结构形式规则化,组织成四方八位的格局,赋予了蓝印花布特定的形式意义,述说着劳动人民朴素的宇宙观。本文从经典叙事学的聚焦分... 湖南民间蓝印花布图案多为具有吉祥意义的祥禽瑞兽、人物故事、花草鸟蝶,从叙事的角度来看,它们通过一定的结构形式规则化,组织成四方八位的格局,赋予了蓝印花布特定的形式意义,述说着劳动人民朴素的宇宙观。本文从经典叙事学的聚焦分类分析湖南蓝印花布图案零聚焦、内聚焦模式的叙述视角,并将两种叙述视角切换编排形成不同的叙事情节,使用并叙的手法完善蓝印花布的叙事空间结构。湖南民间蓝印花布图案通过多样的叙事题材与多变的叙事手法,共同表达了对幸福生活的追求与向往。 展开更多
关键词 湖南民间蓝印花布 工艺叙事
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