Abstract
Sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs)are the most promising alternatives to lithium-ion batteries,and thus have drawn intensive research attention.Porous carbon materials from different precursors have been widely used as anode materials owing to their compatible storage effec-tiveness of both larger radii sodium and potassium ions.However,the differential bonding behaviors of Na and K ions with porous carbon-based anode are the significant one worth investigating,which could provide a clean picture of alkali ions storage mechanism.Therefore,in this work,we prepare a porous carbon network derived from sawdust(SDC)wastes,to further analyze the differences on sodium and potassium ions storage behaviors in terms of bond-forming process.It is found that,as-prepared SDC an-odes could deliver stable sodium and potassium storage capacities,however,there are notable distinctions in terms of electrochemical behaviors and diffusion processes.By virtue of ex-situ XRD and Raman spec-troscopy,the phase transition reaction of potassium ions could be well-observed,and the results shows that the multiple intercalated compounds was formed in SDC network during ions insertion,further re-sulting in slower diffusion kinetics and larger resistance compared to non-bonded process of sodium ions storage.This study provides more insights into the differences between sodium and potassium ions stor-age,as well as the energy storage mechanism of porous carbon as anodes for secondary batteries.
基金项目
国家自然科学基金(52302222)
吉林省自然科学基金(20230508177RC)
中国博士后科学基金(2022M720704)
中国博士后科学基金(2023T160094)
中央高校基本科研业务费专项(2412022QD038)
NETL
NSTL
万方数据