Design of Manganese-Cobalt Layered Double Hydroxide Nanomaterials Coupled with Solution-Based Graphene as Anode Materials for Sodium-Ion Batteries
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Author list: You X.-Y.; Chung R.-J.; Kongvarhodom C.; Husain S.; Yougbaré S.; Chen H.-M.; Wu Y.-F.; Lin L.-Y.
Publisher: American Chemical Society
Publication year: 2025
ISSN: 2574-0970
eISSN: 2574-0970
Languages: English-Great Britain (EN-GB)
Abstract
Sodium-ion batteries (SIBs) are one of the advanced energy storage devices due to the abundant resources of sodium. Layered double hydroxides (LDHs) have a unique two-dimensional (2D) structure with large open spaces that facilitate the effective diffusion and migration of sodium ions. Manganese and cobalt LDH (MnCo-LDH) has large theoretical capacities and high redox activities, but serious volume expansions and low electrical conductivities restrict its energy storage abilities. In this study, MnCo-LDH nanomaterials and commercial graphene, Ultraphene, are combined as an anode material for SIBs via simple mixing and ion exchange processes. By controlling the Mn precursor amounts, carbon-to-MnCo-LDH ratios, and species of Ultraphene, the highest specific capacity of 941.4 mAh g-1 is obtained at 0.05 A g-1 due to balanced contributions from Mn, Co, and Ultraphene. In addition, the optimal MnCo-LDH/Ultraphene anode maintains a capacity retention of 40% at 0.1 A g-1 after 100 charge and discharge cycles. Smaller charge-transfer resistances and higher sodium-ion diffusion coefficients are also achieved. This work proposes a blueprint for designing efficient anode materials based on 2D LDHs and carbon composites. It is promising to incorporate additional metals into LDHs and combine them with carbon species as anode materials for SIBs to achieve improved energy storage performance. © 2025 The Authors. Published by American Chemical Society.
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