Lithium-rich manganese-based layered oxide cathode materials for lithium-ion batteries modified by MoS2 coatings with two-dimensional graphene-like structures

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2024-11, Vol.703, p.135381, Article 135381
• Main Authors: Jin, Guangchao, Li, Ao, Liu, Dongmei, Hu, Kaihan, Sun, Songyuan, Wu, Huigui, Chen, Jingbo
• Format: Article
• Language: English
• Subjects: Fast ionic conductors; Lithium-ion batteries; Molybdenum sulfide; Rate properties; Surface coating; Two-dimensional diffusion channels
• ISSN: 0927-7757
• DOI: 10.1016/j.colsurfa.2024.135381

Lithium-rich manganese-based layered oxide cathode materials (LRMCs) have some unique advantages such as high theoretical capacity (≥ 250 mAh g−1) and high energy density. Therefore, they are deemed as a kind of cathode material for lithium-ion batteries with an excellent prospect of application. However, the redox of oxygen anion is able to generate irreversible lattice oxygen loss, leading to irreversible loss of capacity, bringing about a sharp drop of working voltage, and seriously restricting the commercialization of LRMCs. In this paper, MoS2 coating with two-dimensional graphene-like structure was coated on the surface of LRMCs materials for improving the cycling stability and rate performance. The MoS2 coating can provide a two-dimensional diffusion channel for the migration of lithium-ions, which facilitates the fast release of lithium-ions during cycling process. The results show that the first discharge capacity, initial Coulomb efficiency and rate performance of LRMCs are improved. When the current density is 1 C, the first discharge specific capacity of LRMCs@MoS2 reaches 227.69 mAh g−1, and the capacity retention ratio is 84.98 % after 100 cycles. When the current density is 5 C, it can still provide a discharge specific capacity of 137.87 mAh g−1, demonstrating excellent electrochemical performance. This study comes up a simple and practical idea to realize the modification of cathode materials for high performance lithium-ion batteries. [Display omitted] •Lithium-rich manganese-based cathode materials coated by MoS2 with 2D graphene-like structure were obtained.•The presence of a MoS2 coating has a significant effect on slowing down the onset of interface side reactions.•MoS2 can provide a stable two-dimensional diffusion channel for lithium-ions diffusion.•LRMCs@4%MoS2 material has a discharge specific capacity of 227.69 mAh g-1 at a current density of 1C.