Issue 4, 2023

A high-energy hybrid lithium-ion capacitor enabled by a mixed capacitive-battery storage LiFePO4 – AC cathode and a SnP2O7 – rGO anode

Abstract

In this work we present the development and optimization of a graphene-embedded Sn-based material and an activated carbon/lithium iron phosphate composite for a high-performing hybrid lithium-ion capacitor (LIC). For the negative electrode, we have synthesized and screened different tin and phosphorus-based graphene materials based on the chemical structure, morphology and particle size, selecting a composite consisting of nano-sized crystalline tin pyrophosphate (SnP2O7) particles embedded in a graphenic matrix. For the positive electrode, a composite combining a high-loading (40 wt%) faradaic material lithium iron phosphate (LFP) with a graphene-activated carbon was developed whereas other bi-material cathodes are limited to about 20 wt% of faradaic material. The homogeneous distribution of nanosized carbon-coated LFP particles along the graphene-activated carbon has enabled energy storage via faradaic, pseudocapacitive, and capacitive mechanisms. The optimized-electrode LIC delivers high energy densities and overcomes the main power limitations of LICs using high-content battery-type materials (143 Wh kg−1 at 128 W kg−1 and 45 Wh kg−1 at 25 000 W kg−1).

Graphical abstract: A high-energy hybrid lithium-ion capacitor enabled by a mixed capacitive-battery storage LiFePO4 – AC cathode and a SnP2O7 – rGO anode

Supplementary files

Article information

Article type
Paper
Submitted
19 10 2022
Accepted
23 12 2022
First published
17 1 2023
This article is Open Access
Creative Commons BY-NC license

Sustainable Energy Fuels, 2023,7, 965-976

A high-energy hybrid lithium-ion capacitor enabled by a mixed capacitive-battery storage LiFePO4 – AC cathode and a SnP2O7 – rGO anode

M. Granados-Moreno, G. Moreno-Fernández, R. Mysyk and D. Carriazo, Sustainable Energy Fuels, 2023, 7, 965 DOI: 10.1039/D2SE01459A

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