Surface Li + /H + Exchange Engineering for Enhancing Structural Stability and Electrochemical Performance of Lithium‐Rich Manganese‐Based Layered Oxides
Year: 2025
Type: article
Abstract: Lithium‐rich manganese‐based layered oxides (LRO) are promising ultra‐high‐capacity cathode materials for next‐generation lithium‐ion batteries but suffer from structural instability, capacity/voltage decay, and poor rate capability. Herein, a novel surface spinel coating strategy is proposed to address these challenges through a citric acid solution treatment followed by thermal annealing. A Li 4 Mn 5 O 12 spinel coating layer is formed on the cathode material surface via Li + /H + exchange and structural rearrangement, while preserving the bulk‐layered structure. The spinel phase not only suppresses interfacial side reactions and lattice oxygen loss but also establishes 3D Li + diffusion channels, enhancing kinetics and surface stability. The modified cathode material exhibits remarkable electrochemical improvements with a high‐rate capacity of 205.29 mAh g −1 at 5 C, and 86.3% capacity retention after 150 cycles at 1 C, outperforming the untreated LRO. This work provides a scalable surface engineering approach to reconcile the trade‐off between high energy density and long‐cycle stability in the LRO, advancing their practical viability for high‐energy‐density batteries.
Source: Small
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4415957063