Issue 9, 2024

Regulating electrode/electrolyte interfacial chemistry enables 4.6 V ultra-stable fast charging of commercial LiCoO2

Abstract

The difficulty of achieving fast-charging high-voltage lithium-ion batteries arises from severely unstable electrode–electrolyte interfaces with sluggish kinetics. Here we overcome this challenge by developing a “cocktail electrolyte” enabling commercial LiCoO2 with ultra-stable fast-charging in a wide-temperature range. Unlike commercial carbonate electrolytes, our electrolyte synergistically contributes to fast ion transport and robust electrode/electrolyte interphases, which suppresses interfacial side reactions, accelerates interfacial reaction kinetics on the cathode side, and prevents Li-dendrites on anodes even at extremely high-rates (3C and 5C). Consequently, the Li||LiCoO2 coin cell displays ultra-high stability both at a fast-charging rate (5C, 73.2% retention after 1000 cycles) and under extreme conditions (−20 and 45 °C), far beyond the state-of-the-art electrolytes. Moreover, we show the practical and general applicability of our electrolyte through the stable operation of a graphite||LiCoO2 pouch cell (72.1% retention after 2000 cycles) and other advanced high-Ni or Co-free cathodes. This work proposes deep insights and a practical strategy for high-energy-density and fast-charging batteries.

Graphical abstract: Regulating electrode/electrolyte interfacial chemistry enables 4.6 V ultra-stable fast charging of commercial LiCoO2

Supplementary files

Article information

Article type
Paper
Submitted
12 2月 2024
Accepted
04 3月 2024
First published
07 3月 2024
This article is Open Access
Creative Commons BY-NC license

Energy Environ. Sci., 2024,17, 3021-3031

Regulating electrode/electrolyte interfacial chemistry enables 4.6 V ultra-stable fast charging of commercial LiCoO2

A. Zhang, Z. Bi, G. Wang, S. Liao, P. Das, H. Lin, M. Li, Y. Yu, X. Feng, X. Bao and Z. Wu, Energy Environ. Sci., 2024, 17, 3021 DOI: 10.1039/D4EE00676C

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