Issue 37, 2024

High-capacity ultra-thin flexible lithium-ion batteries with enhanced rate capability by a cast all-in-one cathode-separator-anode monolith

Abstract

Herein, we develop a novel all-in-one cathode-separator-anode monolith architecture designed for high-capacity, ultra-thin flexible batteries. This architecture involves directly casting electrode slurry onto both sides of a polypropylene (PP) separator. Controlled volatility and wettability of the solvent system are critical for the formation of neat electrode coating layers on the PP separator. The monolith structure offers remarkable flexibility and intimate contact between the electrode and separator, which is especially advantageous when stacked for higher areal capacity. The monoliths are conjoined into an all-in-one multi-layered monolith structure, deploying electrode slurry as an ‘electrochemically active adhesive’ between them, enabling the creation of high-capacity, ultra-thin flexible batteries. The resulting pouch cell exhibits a high capacity of 44.5 mA h (areal capacity of 4.9 mA h cm−2) at 1 mA and a thickness below 1 mm. Notably, this cell boasts superior rate capability even at this high capacity, showing a discharge capacity of 36.3 mA h at 20 mA. Practical application of this high-capacity, ultra-thin flexible battery is demonstrated in a band-type light-therapy patch, which shows operational stability when bent around a human arm. This development marks a significant advancement in the design of ultra-thin, high-capacity flexible batteries, with potential applications in flexible and wearable battery technologies.

Graphical abstract: High-capacity ultra-thin flexible lithium-ion batteries with enhanced rate capability by a cast all-in-one cathode-separator-anode monolith

Supplementary files

Article information

Article type
Paper
Submitted
06 Jul 2024
Accepted
27 Aug 2024
First published
02 Sep 2024

J. Mater. Chem. A, 2024,12, 25056-25066

High-capacity ultra-thin flexible lithium-ion batteries with enhanced rate capability by a cast all-in-one cathode-separator-anode monolith

S. H. Park, N. K. Lee, J. H. Han, S. Eo, Y. Park, K. C. Choi and Y. J. Lee, J. Mater. Chem. A, 2024, 12, 25056 DOI: 10.1039/D4TA04682J

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