Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 2, Pages 1134-1142Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta09676h
Keywords
-
Funding
- NSFC [51872162, 11890700]
- Natural Science Foundation of Shandong [ZR2018MEM013]
Ask authors/readers for more resources
This study developed a novel LIC with a silicon (Si) nanoparticles 3D conductive framework supported by graphene aerogel (GA) as the anode and boron carbonitride nanotubes (BCNNTs) as the cathode. By balancing high capacity anodes and fast-rate cathodes, the LIC achieved excellent electrochemical performance and high energy density.
The challenge for current lithium-ion capacitors (LICs) to obtain high energy density is to improve the energy storage performance at high rates. The key lies in balancing the kinetics mismatch between battery-type anode and capacitor-type cathode as well as ensuring high capacity contribution of electrodes. To this end, graphene aerogel (GA) supported high-capacity silicon (Si) nanoparticles 3D conductive framework is designed as anode for LICs, overcoming the notably volume expansion (300%) of Si and contributing to the high energy density. More importantly, a dominating capacitive mechanism lies in the intercalation process of Si@GA anode, which enables its fast charge-discharge capability. So as to match the high capacity anodes, boron carbonitride nanotubes (BCNNTs) with high-rate pseudocapacitive behavior and desirable capacity are used as cathode to construct a novel LIC with high energy density. Benefiting from high-rate capabilities of both anode and cathode, the rational designed 4.5 V Si@GA//BCNNTs LIC exhibits excellent electrochemical performance, delivering a maximum energy density of 197.3 W h kg(-1) at the power density of 225 W kg(-1). This strategy may widen the application for materials with volume expansion issues and many other material systems in pseudocapacitive advanced high-rate devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available