Porous Si@C ball-in-ball hollow spheres for lithium-ion capacitors with improved energy and power densities

被引：62

作者：

Li, Bo ^{[1
]}

Li, Shixiong ^{[1
]}

Jin, Ying ^{[2
]}

Zai, Jiantao ^{[1
]}

Chen, Ming ^{[1
]}

Nazakat, Ali ^{[1
]}

Zhan, Peng ^{[2
]}

Huang, Yong ^{[2
]}

Qian, Xuefeng ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Sch Chem & Chem Engn, Shanghai Electrochem Energy Devices Res Ctr, Shanghai 200240, Peoples R China

[2] ZhongTian Emerging Mat Co LTD, Nantong 226000, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2018年 / 6卷 / 42期

基金：

中国国家自然科学基金;

关键词：

BATTERY ANODES; PERFORMANCE; SILICON; STORAGE; COMPOSITE; NANOSPHERES; POLYPYRROLE; NANOSHEETS; GROWTH; LI;

D O I：

10.1039/c8ta07576j

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：

The rate capability of battery-type anode materials has become a great limitation to the energy and power densities of lithium-ion capacitors. Besides the electronic conductivity, it is crucial to enhance the electrochemical rate by facilitating the diffusion and transportation of Li+. Herein, a new kind of porous Si@C ball-in-ball hollow structure was designed to build a stable electrode-electrolyte interface, overcome the volume change of Si and enhance the mass diffusion and conductivity simultaneously. The obtained porous Si@C ball-in-ball hollow spheres as Si anodes show great cycling stability for 1000 cycles and good rate capability with 943 and 586 mA h g(-1) at 16.0 and 32.0 A g(-1), respectively. As a result, lithium-ion capacitors based on porous Si@C ball-in-ball hollow spheres as anode materials give high energy densities of 239 and 154 W h kg(-1) at the power densities of 1376 and similar to 69 600 W kg(-1), respectively. Furthermore, the lithium-ion capacitors also show a stable cycling performance for 15 000 cycles at 6.4 A g(-1).

引用

页码：21098 / 21103

页数：6

共 42 条

[1] An asymmetric hybrid nonaqueous energy storage cell [J].