With the rapid emergence of wearable devices, flexible lithium-ion batteries(LIBs) are much more needed than ever. Free-standing graphene-based composite paper electrodes with various active materials have appealed wi...With the rapid emergence of wearable devices, flexible lithium-ion batteries(LIBs) are much more needed than ever. Free-standing graphene-based composite paper electrodes with various active materials have appealed wide applications in flexible LIBs. However, due to the prone-to-restacking feature of graphene layers, a long cycle life at high current densities is rather difficult to be achieved. Herein, a unique threedimensional(3D) hierarchically porous NiO micro-flowers/graphene paper(fNiO/GP) electrode is successfully fabricated. The resulting fNiO/GP electrode shows superior long-term cycling stability at high rates(e.g., storage capacity of 359 mAh/g after 600 cycles at a high current density of 1 A/g). The facile 3D porous structure combines both the advantages of the graphene that is highly conductive and flexible to ensure rapid electrons/ions transfer and buffer the volume expansion of NiO during charge/discharge,and of the micro-sized NiO flowers that induces hierarchical between-layer pores ranging from nanomicro meters to promote the penetration of the electrolyte and prevent the re-stacking of graphene layers. Such structural design will inspire future manufacture of a wide range of active materials/graphene composite electrodes for high performance flexible LIBs.展开更多
Powering the future,while maintaining strong socioeconomic growth and a cleaner environment,is going to be one of the biggest challenges faced by mankind nowadays.Thus,there is a transition from the use of fossil fuel...Powering the future,while maintaining strong socioeconomic growth and a cleaner environment,is going to be one of the biggest challenges faced by mankind nowadays.Thus,there is a transition from the use of fossil fuels to renewable energy sources.Cellulose,the main component of paper,represents a unique type of bio-based building blocks featuring exciting properties:low-cost,hierarchical fibrous structures,hydrophilicity,biocompatible,mechanical flexibility,and renewability,which make it perfect for use in paper-based sustainable energy storage devices.This review focuses on lithium-ion battery application of celluloses with cellulose at different scales,i.e.,cellulose microfibers,and nanocellulose,and highlights the new trends in the field.Recent advances and approaches to construct high mass loading paper electrodes toward high energy density batteries are evaluated and the limitations of paper-based cathodes are discussed.This will stimulate the use of natural resources and thereby the development of renewable electric energy systems based on sustainable technologies with low environmental impacts and carbon footprints.展开更多
基金financially supported by the National Key R&D Program of China (No.2017YFE0111500)the National Natural Science Foundation of China (No.51673123 and 51222305)Sichuan Province Science and Technology Project (No.2016JQ0049)。
文摘With the rapid emergence of wearable devices, flexible lithium-ion batteries(LIBs) are much more needed than ever. Free-standing graphene-based composite paper electrodes with various active materials have appealed wide applications in flexible LIBs. However, due to the prone-to-restacking feature of graphene layers, a long cycle life at high current densities is rather difficult to be achieved. Herein, a unique threedimensional(3D) hierarchically porous NiO micro-flowers/graphene paper(fNiO/GP) electrode is successfully fabricated. The resulting fNiO/GP electrode shows superior long-term cycling stability at high rates(e.g., storage capacity of 359 mAh/g after 600 cycles at a high current density of 1 A/g). The facile 3D porous structure combines both the advantages of the graphene that is highly conductive and flexible to ensure rapid electrons/ions transfer and buffer the volume expansion of NiO during charge/discharge,and of the micro-sized NiO flowers that induces hierarchical between-layer pores ranging from nanomicro meters to promote the penetration of the electrolyte and prevent the re-stacking of graphene layers. Such structural design will inspire future manufacture of a wide range of active materials/graphene composite electrodes for high performance flexible LIBs.
基金This work was supported by the Outstanding Youth Scientist Foundation of Hunan Province(Grant No.2021JJ10017),ChinaFundamental Research Funds for the Central Universities.
文摘Powering the future,while maintaining strong socioeconomic growth and a cleaner environment,is going to be one of the biggest challenges faced by mankind nowadays.Thus,there is a transition from the use of fossil fuels to renewable energy sources.Cellulose,the main component of paper,represents a unique type of bio-based building blocks featuring exciting properties:low-cost,hierarchical fibrous structures,hydrophilicity,biocompatible,mechanical flexibility,and renewability,which make it perfect for use in paper-based sustainable energy storage devices.This review focuses on lithium-ion battery application of celluloses with cellulose at different scales,i.e.,cellulose microfibers,and nanocellulose,and highlights the new trends in the field.Recent advances and approaches to construct high mass loading paper electrodes toward high energy density batteries are evaluated and the limitations of paper-based cathodes are discussed.This will stimulate the use of natural resources and thereby the development of renewable electric energy systems based on sustainable technologies with low environmental impacts and carbon footprints.
