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Published on: November 11, 2013
Enhancing Ultrahigh-Rate Stability of LiNi0.5Mn1.5O4 Cathode Via Interfacial Stabilization and Phase Transition
Shan Wang1,2, Yilong Jia1,2, Ruida Zhao1,2
1Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
This study enhances spinel lithium nickel manganese oxide (LNMO) cathodes for lithium-ion batteries. A dual modification strategy improves stability and rate performance, crucial for next-generation fast-charging applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Spinel LiNi0.5Mn1.5O4 (LNMO) is a high-voltage cathode material for lithium-ion batteries.
- Commercialization is hindered by interfacial side reactions, Mn dissolution, and phase transitions, leading to degradation and capacity fading.
Purpose of the Study:
- To develop a dual-functional modification strategy for LNMO.
- To simultaneously stabilize the LNMO interface and suppress two-phase transitions.
Main Methods:
- Constructing a stable CeO2 surface layer on LNMO.
- Incorporating cerium (Ce) into the bulk 16d sites of LNMO.
Main Results:
- The CeO2 layer effectively mitigates Mn dissolution and HF corrosion.
- Bulk Ce incorporation stabilizes the lattice and enhances Li+ diffusion.
- Modified LNMO shows exceptional ultrahigh-rate performance (117.8 mAh g-1 at 10 C) with 96.1% retention after 500 cycles.
Conclusions:
- The dual-functional modification strategy significantly improves LNMO stability and electrochemical performance.
- This approach offers valuable insights for developing advanced fast-charging lithium-ion batteries.
