Hybrid heterojunction containing rich oxygen vacancies for suppressing lattice oxygen release of Li-rich Mn-based layered oxides cathodes
Year: 2025
Type: article
Abstract: Li-rich manganese-based layered oxides (LLOs) cathode materials have gained significant attention worldwide as potential cathode materials for the next generation of high-energy density lithium-ion batteries due to its high theoretical capacity (>250 mAh g-1). However, the irreversible release of lattice oxygen in LLOs severely limits its commercial application. Herein, a facile ultrasonic-assisted calcination method is employed to induce the formation of hybrid heterojunction containing rich oxygen vacancies (HROV) composed of C3N4@LLOs and Li3PO4@LLOs on the surface of LLOs, thereby obtaining modified LLOs (M-LLOs). M-LLOs exhibit enhanced initial Coulombic efficiency from 80.18% to 85.1%, elevated initial discharge specific capacity from 270.2 mAh g-1 to 311.5 mAh g-1, and improved capacity retention rate after 300 cycles at 1 C from 58.8% to 84.2%. Combining in-situ characterization techniques with density functional theory (DFT) calculations reveals the performance improvement mechanism of M-LLOs, which demonstrates that HROV effectively suppresses the irreversible release of lattice oxygen, enhances the binding strength of Mn-O bonds in M-LLOs, and consequently stabilize the structural phase transitions during charge/discharge processes. These results provide insights into understanding the functional role of hybrid heterojunctions in suppressing lattice oxygen release of LLOs, and provide essential theoretical foundations to accelerate the commercialization process of LLOs.
Authors: Huai Chen, HanJie Si, Jun Ma, Shuo Geng, Fei Liu
Institution: Guizhou University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,470
Award: G6803372959
OpenAlex ID: W4408663985