Lithium-air capacitor-battery(LACB)is a novel electrochemical energy storage device that integrates the fast charging-anddischarging function of a supercapacitor into a conventional lithium-air battery(LAB),thereby ga...Lithium-air capacitor-battery(LACB)is a novel electrochemical energy storage device that integrates the fast charging-anddischarging function of a supercapacitor into a conventional lithium-air battery(LAB),thereby gaining a substantial increase in power density compared to the lithium-air battery.However,its development is severely limited by the complex dual-electrolyte and dual-atmosphere construction used in the reported devices.Herein,we present a prototype lithium-air capacitor-battery with an exceptionally simplified single electrolyte and double-cathode(an air electrode and a capacitor electrode)structure under one gas atmosphere.In particular,the ingenious introduction of an oxygen-barrier film between the two cathodes allows the device to exhibit reliable and rapid conversion between high energy and high power by controlling current density.Thus obtained cathode delivers a large full capacity of 16.9 m Ah cm^(-2)and it also exhibits excellent cycle stability for stable operation up to 5,500 laps at a fixed capacity of 0.1 m Ah cm^(-2)at the current density of 2 m A cm^(-2).In addition,the LACB has a self-charging capability.This work puts forward a new construction strategy for LACB systems,which is conducive to their rapid development.展开更多
基金supported by the Guangdong Basic and Applied Basic Research Foundation(2022B1515120019)the National Natural Science Foundation of China(22279166,52203346)the National Key R&D Program of China(2022YFB2402600)。
文摘Lithium-air capacitor-battery(LACB)is a novel electrochemical energy storage device that integrates the fast charging-anddischarging function of a supercapacitor into a conventional lithium-air battery(LAB),thereby gaining a substantial increase in power density compared to the lithium-air battery.However,its development is severely limited by the complex dual-electrolyte and dual-atmosphere construction used in the reported devices.Herein,we present a prototype lithium-air capacitor-battery with an exceptionally simplified single electrolyte and double-cathode(an air electrode and a capacitor electrode)structure under one gas atmosphere.In particular,the ingenious introduction of an oxygen-barrier film between the two cathodes allows the device to exhibit reliable and rapid conversion between high energy and high power by controlling current density.Thus obtained cathode delivers a large full capacity of 16.9 m Ah cm^(-2)and it also exhibits excellent cycle stability for stable operation up to 5,500 laps at a fixed capacity of 0.1 m Ah cm^(-2)at the current density of 2 m A cm^(-2).In addition,the LACB has a self-charging capability.This work puts forward a new construction strategy for LACB systems,which is conducive to their rapid development.
