Activation-free N-doped porous carbon to enhance surface-driven K storage vs intercalation dominated Na storage

被引：14

作者：

Chen, Zhi ^{[1
]}

Liao, Jiaxuan ^{[1
]}

Li, Wenlei ^{[1
]}

Song, Yaochen ^{[1
]}

Chen, Cheng ^{[1
]}

Yang, Jian ^{[1
]}

Xu, Ziqiang ^{[1
]}

Feng, Tingting ^{[1
]}

Wu, Mengqiang ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Mat & Energy, Chengdu 611731, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2020年 / 506卷

关键词：

Nitrogen-doped; Sodium ion battery (NaIB); Potassium ion battery (KIB); Porous carbon; Activation-free; HIGH-PERFORMANCE; HARD CARBON; ELECTROCHEMICAL PERFORMANCE; DIELECTRIC-PROPERTIES; ION; LITHIUM; ANODE; NANOCOMPOSITES; FABRICATION; FRAMEWORK;

D O I：

10.1016/j.apsusc.2019.144909

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Carbonaceous materials show more and more obvious applications in potassium (K) ion battery (KIB) and sodium (Na) ion battery (NaIB) because K and Na have higher reserves than lithium (Li). However, the rate performance and cycle stability of KIBs and NaIBs are still hindered by huge volume change during ions insertion-extraction process and poor kinetics caused by larger volume of K(+)and Na+ ions. Compared to graphite and hard carbon, nitrogen (N)-doped porous carbonaceous materials may provide good interfacial wettability and numerous ion transport channels, but low first coulombic efficiency is detrimental to the application of full-battery. Here, N-doped porous carbon (NPC) with a providential specific surface area is synthesized by a facile and activation-free way. Benefiting from N-doping and porous structure, KIBs and NaIBs display an enhanced rate capacity and cycle performance. The storage mechanism and kinetic characteristics of K and Na ion during charge and discharge are also discussed. Comprehensive performance indicates that NPC can obtain a better improvement in surface-driven KIBs than intercalation dominated NaIBs, and can provide some new design concepts for practical applications.

引用

页数：7

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