Organic electrode materials with the versatility of molecular engineering emerge as promising alternatives to construct high-performance batteries.However,a weak binding force between active layers leads to poor struc...Organic electrode materials with the versatility of molecular engineering emerge as promising alternatives to construct high-performance batteries.However,a weak binding force between active layers leads to poor structural stability accompanied by a multi-electron redox,thus hindering the construction of practical devices based on organic materials.Herein,we report a structural engineering approach to improve the structural stability of organic molecules by pre-intercalating potassium ions(K^(+))as pillars into the adjacent rhodizonate(C_(6)O_(6)^(2−))layers.This enhanced binding,with increased coordination sites of K-O,effectively prevents the exfoliation of C_(6)O_(6)^(2−)layers and provides stable diffusion channels for lithium ions(Li^(+)).The resulting batteries exhibit accelerated reaction kinetics and enhanced Li^(+)diffusion,leading to a high energy density of 722 Wh kg^(−1)(based on active materials)and reversible capacity of 315 mAh g^(−1)at 1.0C,with a capacity retention of 225 mAh g^(−1)after 500 cycles.In addition,by virtue of the flexible nature,a Li-K_(2)C_(6)O_(6)battery has been made into flexible fibers for next-generation wearable systems,offering a new avenue for realizing practical devices based on organic single molecules.This work presents a general and efficient strategy to unlock theoretically high-performance organic electrode materials for advanced Li-organic batteries.展开更多
Lithium-sulfur(Li-S)batteries have been regarded as promising next-generation energy-storage devices owing to their inherently high theoretical energy density.Unfortunately,the poor capacity and cycling life caused by...Lithium-sulfur(Li-S)batteries have been regarded as promising next-generation energy-storage devices owing to their inherently high theoretical energy density.Unfortunately,the poor capacity and cycling life caused by severe polysulfide shuttle effect and sluggish redox kinetics in sulfur cathodes greatly impede the practical application of Li-S batteries.Herein,a new class of nanonetworkstructured carbon decorated with oxygen-vacancy-containing cerium oxide nanoparticles(NSC-CeO_(2−x)),in which carbon skeleton is composed of highly conductive carbon nanotube core welded by hybrid carbon shell,has been developed via one-step heating treatment of hybrid molecular brush and further employed as functional interlayer to modify separator of Li-S battery.Owing to the synergistic effect of the highly active CeO_(2−x)nanoparticles and the threedimensional carbon nanonetwork in enhancing the preservation of the soluble polysulfides and boosting the redox kinetics of sulfur species,the NSC-CeO_(2−x)significantly promotes the electrochemical performance of sulfur cathode.As a result,the as-constructed Li-S batteries exhibit an ultrahigh initial sulfur utilization of 92.9%and an extremely large capacity of 751mA h g^(−1) at a high rate of 5 C.Remarkably,a stable capacity of 728 mA h g^(−1)over 300 cycles at 1 C is also achieved.展开更多
With the rise of flexible wearable electronics,the demands for flexible energy storage devices have significantly increased to power other flexible electronics[1].Lithium-ion batteries(LIBs),renowned for their high en...With the rise of flexible wearable electronics,the demands for flexible energy storage devices have significantly increased to power other flexible electronics[1].Lithium-ion batteries(LIBs),renowned for their high energy density,long cycle lifespan,and high operating voltage,have been widely used as commercial power sources for various portable electronics[2].However,traditional LIBs,typically characterized by rigid and bulky structures,fail to meet the requirements of next-generation electronic devices.Consequently.展开更多
水系金属空气电池具有理论能量密度高、安全性高等优点,但受限于金属阳极(如锌、铁、铝、镁)的电化学不可逆性以及碱性电解质对大气中二氧化碳的化学不稳定性.本工作首次设计了一种可充电的铋-空气电池,该电池使用了非碱性的三氟甲磺酸...水系金属空气电池具有理论能量密度高、安全性高等优点,但受限于金属阳极(如锌、铁、铝、镁)的电化学不可逆性以及碱性电解质对大气中二氧化碳的化学不稳定性.本工作首次设计了一种可充电的铋-空气电池,该电池使用了非碱性的三氟甲磺酸铋(Bi(OTf)_(3))水系电解质.得益于三电子反应和相对于标准氢电极+0.32 V的高电位,铋金属负极具有383 mA h g^(−1)的高比容量和1000次循环的良好稳定性,以及99.6%高库仑效率.铋金属负极在Bi(OTf)_(3)电解液中无腐蚀、钝化和析氢等副反应.此外,非碱性的铋-空气电池通过三氧化二铋(Bi_(2)O_(3))的可逆形成/分解,在环境空气中实现了长期运行稳定性(>200 h).这项工作为探索新型水系金属空气电池作为安全稳定的电源系统提供了新思路.展开更多
基金supported by NSFC(52222310,T2321003,22335003)MOST(2022YFA1203001,2022YFA1203002)STCSM(21511104900).
文摘Organic electrode materials with the versatility of molecular engineering emerge as promising alternatives to construct high-performance batteries.However,a weak binding force between active layers leads to poor structural stability accompanied by a multi-electron redox,thus hindering the construction of practical devices based on organic materials.Herein,we report a structural engineering approach to improve the structural stability of organic molecules by pre-intercalating potassium ions(K^(+))as pillars into the adjacent rhodizonate(C_(6)O_(6)^(2−))layers.This enhanced binding,with increased coordination sites of K-O,effectively prevents the exfoliation of C_(6)O_(6)^(2−)layers and provides stable diffusion channels for lithium ions(Li^(+)).The resulting batteries exhibit accelerated reaction kinetics and enhanced Li^(+)diffusion,leading to a high energy density of 722 Wh kg^(−1)(based on active materials)and reversible capacity of 315 mAh g^(−1)at 1.0C,with a capacity retention of 225 mAh g^(−1)after 500 cycles.In addition,by virtue of the flexible nature,a Li-K_(2)C_(6)O_(6)battery has been made into flexible fibers for next-generation wearable systems,offering a new avenue for realizing practical devices based on organic single molecules.This work presents a general and efficient strategy to unlock theoretically high-performance organic electrode materials for advanced Li-organic batteries.
基金National Natural Science Foundation of China,Grant/Award Numbers:51872336,51925308,52172061National Key Research and Development Program of China,Grant/Award Number:2021YFF0500600+2 种基金Pearl River Talent Plan of Guangdong,Grant/Award Number:2017GC010612Natural Science Foundation of Guangdong,Grant/Award Number:2021A1515011617Science and Technology Program of Guangzhou,Grant/Award Numbers:202102021111,202002020041。
文摘Lithium-sulfur(Li-S)batteries have been regarded as promising next-generation energy-storage devices owing to their inherently high theoretical energy density.Unfortunately,the poor capacity and cycling life caused by severe polysulfide shuttle effect and sluggish redox kinetics in sulfur cathodes greatly impede the practical application of Li-S batteries.Herein,a new class of nanonetworkstructured carbon decorated with oxygen-vacancy-containing cerium oxide nanoparticles(NSC-CeO_(2−x)),in which carbon skeleton is composed of highly conductive carbon nanotube core welded by hybrid carbon shell,has been developed via one-step heating treatment of hybrid molecular brush and further employed as functional interlayer to modify separator of Li-S battery.Owing to the synergistic effect of the highly active CeO_(2−x)nanoparticles and the threedimensional carbon nanonetwork in enhancing the preservation of the soluble polysulfides and boosting the redox kinetics of sulfur species,the NSC-CeO_(2−x)significantly promotes the electrochemical performance of sulfur cathode.As a result,the as-constructed Li-S batteries exhibit an ultrahigh initial sulfur utilization of 92.9%and an extremely large capacity of 751mA h g^(−1) at a high rate of 5 C.Remarkably,a stable capacity of 728 mA h g^(−1)over 300 cycles at 1 C is also achieved.
基金supported by Ministry of Science and Technology of the People’s Republic of China(2022YFA1203002 and 2022YFA1203001)the National Natural Science Foundation of China(52222310,T2321003,22335003,and 22205039)China Postdoctoral Science Foundation(2023M740651 and 2022M710733)。
文摘With the rise of flexible wearable electronics,the demands for flexible energy storage devices have significantly increased to power other flexible electronics[1].Lithium-ion batteries(LIBs),renowned for their high energy density,long cycle lifespan,and high operating voltage,have been widely used as commercial power sources for various portable electronics[2].However,traditional LIBs,typically characterized by rigid and bulky structures,fail to meet the requirements of next-generation electronic devices.Consequently.
基金financially supported by the Science and Technology Commission of Shanghai Municipality(STCSM,21511104900 and 20JC1414902)the National Natural Science Foundation of China(52222310).
文摘水系金属空气电池具有理论能量密度高、安全性高等优点,但受限于金属阳极(如锌、铁、铝、镁)的电化学不可逆性以及碱性电解质对大气中二氧化碳的化学不稳定性.本工作首次设计了一种可充电的铋-空气电池,该电池使用了非碱性的三氟甲磺酸铋(Bi(OTf)_(3))水系电解质.得益于三电子反应和相对于标准氢电极+0.32 V的高电位,铋金属负极具有383 mA h g^(−1)的高比容量和1000次循环的良好稳定性,以及99.6%高库仑效率.铋金属负极在Bi(OTf)_(3)电解液中无腐蚀、钝化和析氢等副反应.此外,非碱性的铋-空气电池通过三氧化二铋(Bi_(2)O_(3))的可逆形成/分解,在环境空气中实现了长期运行稳定性(>200 h).这项工作为探索新型水系金属空气电池作为安全稳定的电源系统提供了新思路.
