Issue 21, 2022

Pre-lithiated Li4+xTi5O12 (0 ≤ x ≤ 3) anodes towards building high-performance Li-ion capacitors

Abstract

Spinel Li4Ti5O12 is an extensively studied and successfully commercialized battery type electrode for lithium-ion capacitors (LICs), mainly due to its abundance, improved rate capability, and safety guaranteed by the high potential intercalation mechanism. However, still, there is an unanswered question – is prelithiation necessary for LTO-based LIC systems? In this work, we studied the role of prelithiation by assembling different LICs with LTO anodes by varying prelithiation levels (Li4+xTi5O12, 0 ≤ x ≤ 3) with activated carbon (AC) electrodes. The disparities in electrochemical performance of such LICs, energy-power storage capability, and cycling stability are also investigated. The assembled AC/Li4Ti5O12 cell shows a maximum energy storage capability of 84.59 W h kg−1 at a current density of 0.05 A g−1. And, a LIC with an optimum prelithiation level (∼30 min (50–55 mA h g−1)) and AC/Li5Ti5O12 configuration exhibits effective utilization of the voltage window. However, the process of prelithiation ensures the cycling stability of such LIC systems.

Graphical abstract: Pre-lithiated Li4+xTi5O12 (0 ≤ x ≤ 3) anodes towards building high-performance Li-ion capacitors

Supplementary files

Article information

Article type
Paper
Submitted
05 8 2022
Accepted
19 9 2022
First published
21 9 2022

Sustainable Energy Fuels, 2022,6, 4884-4892

Pre-lithiated Li4+xTi5O12 (0 ≤ x ≤ 3) anodes towards building high-performance Li-ion capacitors

M. L. Divya, H. Lü, Y. Lee and V. Aravindan, Sustainable Energy Fuels, 2022, 6, 4884 DOI: 10.1039/D2SE01081J

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