Insight of a Phase Compatible Surface Coating for Long‐Durable Li‐Rich Layered Oxide Cathode. Issue 34 (28th July 2019)

• Record Type: Journal Article
• Authors: Hu, Sijiang; Li, Yu; Chen, Yuhua; Peng, Jiming; Zhou, Tengfei; Pang, Wei Kong; Didier, Christophe; Peterson, Vanessa K.; Wang, Hongqiang; Li, Qingyu; Guo, Zaiping
• Is Part Of: Advanced energy materials. Volume 9:Issue 34(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-07-28
• Subjects: Li‐rich layered oxide -- lithium‐ion batteries -- metal ion migration -- surface‐coating -- voltage fade; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201901795
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Li‐rich layered oxides (LLOs) can deliver almost double the capacity of conventional electrode materials such as LiCoO2 and LiMn2 O4 ; however, voltage fade and capacity degradation are major obstacles to the practical implementation of LLOs in high‐energy lithium‐ion batteries. Herein, hexagonal La0.8 Sr0.2 MnO3− y (LSM) is used as a protective and phase‐compatible surface layer to stabilize the Li‐rich layered Li1.2 Ni0.13 Co0.13 Mn0.54 O2 (LM) cathode material. The LSM is MnO M bonded at the LSM/LM interface and functions by preventing the migration of metal ions in the LM associated with capacity degradation as well as enhancing the electrical transfer and ionic conductivity at the interface. The LSM‐coated LM delivers an enhanced reversible capacity of 202 mAh g −1 at 1 C (260 mA g −1 ) with excellent cycling stability and rate capability (94% capacity retention after 200 cycles and 144 mAh g −1 at 5 C). This work demonstrates that interfacial bonding between coating and bulk material is a successful strategy for the modification of LLO electrodes for the next‐generation of high‐energy Li‐ion batteries. Abstract : A facile surface engineering strategy is used to introduce a phase‐compatible La0.8 Sr0.2 MnO3− y (LSM) coating with an R 3 ¯ c hexagonal symmetry to a Li1.2 Ni0.13 Co0.13 Mn0.54 O2 (LM) cathode material with hexagonal R 3 ¯ m symmetry. The electrode bulk structure is stabilized by the coating by the heterostructural MnO M (Ni, Co, or Mn) bonding at the LSM/LM interface.