SCHEDULED MAINTENANCE
A transversal low-cost pre-metallation strategy enabling ultrafast and stable metal ion capacitor technologies†
a
Devaraj
Shanmukaraj,
a
Daniel
Carriazo,
ab
Dhrubajyoti
Bhattacharjya,
a
Michel
Armand
a
and
Jon
Ajuria
*a
Abstract
Metal ion capacitors (MICs) are foreseen to be a complementary alternative of vital importance to current energy storage issues, coupling high energy density delivered by batteries with high power/long cycle life offered by supercapacitors. The prime issues in realising this technology are pre-metallation and replacement of graphite electrodes that bring about an energy gain at the expense of power. Herein we present an easy-to-scale-up approach, combining activated carbon with a highly efficient and industrially compatible low-cost sacrificial salt (dimetal squarates) that can be used as a metal source for pre-metallation. Paired with a hard carbon electrode tailored to perform at high rates, lithium, sodium and potassium MICs are demonstrated. Furthermore, the successful fabrication of a lithium ion capacitor (LIC) pouch cell prototype with high energy at high power densities showing capacitance retention over 84% after 48 000 cycles validates the strategy. This breakthrough may trigger the easy and low-cost fabrication of LICs and significantly reduce technological barriers to market growth and consolidation.
- This article is part of the themed collection: Energy & Environmental Science Cover Art
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