High Performance Capacitors Based on Graphene and Boron Nitride

doi:10.16183/j.cnki.jsjtu.2021.188

Abstract

Abstract:

Flexible all-solid-state supercapacitors (FASS) are energy supplies for wearable electronic devices and power devices. Graphene nanosheets have unique two-dimensional (2D) structures, strong mechanical properties, and an excellent electrical conductivity, which are widely used in paper-like flexible electrodes. The essential feature of the double-layer electric performance for the simple graphene nanosheet-based FASS restricts the improvement of their capacitive performance and practical applications. FASS based on the ultralarge graphene nanosheets and the ultrathin boron nitride (BN) nanosheets are investigated. The nacre-like structures could efficiently integrate both merits of pseudocapacitive BN nanoflakes and conducting graphene, thereby exhibiting an excellent electrochemical performance in FASS. After 5000 charge-discharge cycles, the highest areal specific capacitance of FASS reaches 325.4 mF/cm², with a high capacity retention rate of about 86.2% and a high energy density of 22.8 W·h/kg (1 W·h=3.6 kJ) at a power density of 85.7 W/kg.

Key words: flexible all-solid-state supercapacitors (FASS), graphene, boron nitride (BN)

CLC Number:

WU Jing, TAN Haiyun, SHI Yuchao, HOU Weihong, TANG Ming. High Performance Capacitors Based on Graphene and Boron Nitride[J]. Journal of Shanghai Jiao Tong University, 2022, 56(10): 1325-1333.

Figures/Tables 7

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元素	线类型	w₁	w₂	质量分数标准误差	a	标准样品标签
C	K线系	48.42	56.97	0.15	63.95	纯元素
O	K线系	15.19	42.64	0.15	35.93	SiO₂
N	K线系	0.30	0.28	0.01	0.12	纯元素
B	M线系	0.12	0.12	0.04	0.01	纯元素
总量			100.00		100.00