Carbon 3D frame will improve lithium-ion battery anodes. Free Technical Library News

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Carbon 3D frame will improve lithium-ion battery anodes

29.07.2021

With the goal of eliminating the shortcomings of current lithium-ion battery anodes, a group of engineers from Korea Maritime and Ocean University and Busan National University, in an article for the Chemical Engineering Journal, reported on an anode material they developed with unique structural characteristics that overcome many of the existing barriers to increase anode efficiency.

In their work, the Korean scientists focused on manganese selenide (MnSe), a widely available transition metal compound known for its high electrical conductivity and used in the development of semiconductors and supercapacitors. However, MnSe experiences a sharp (nearly 160%) volume change during charge-discharge, which not only reduces electrode performance but also creates safety issues.

The researchers developed a simple and inexpensive way to compensate for this volume change: they evenly embedded MnSe nanoparticles into a three-dimensional porous carbon nanosheet (3DCNM) matrix. This carbon framework not only protected the fixed MnSe nanoparticles from sudden volume expansion, but also endowed them with numerous additional advantages, such as a large number of active centers and an increased area of contact with the electrolyte.

The best version of this material synthesized by the authors, which showed the highest cyclic stability and charge/discharge rate in tests, continued to demonstrate excellent electrochemical properties (including the kinetics of lithium ion and electron transport) when used as part of a battery prototype with a lithium/manganese oxide cathode.

The team is encouraged by the potential prospects for their achievement: “Using a conductive filler backbone, we have developed an anode that enhances battery performance while providing reversible energy storage. This strategy could be applied to other transition metal selenides with high surface area and stable nanostructure, with applications in energy storage systems, electrocatalysis and semiconductors".

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