Breaking the energy density limit of LiNiO2: Li2NiO3 or Li2NiO2?

The development of next-generation layered oxide cathodes for high-energy-density electrical vehicle Li-ion batteries (LIBs) is an urgent topic. The existing method is achieved by continuously increasing the Ni contents of Ni-based layered oxides, but it has been limited to LiNiO 2 . To break this l...

Full description

Saved in:
Bibliographic Details
Published in:Science China materials 2022-04, Vol.65 (4), p.913-919
Main Authors: Jia, Yining, Ye, Yaokun, Liu, Jiahua, Zheng, Shisheng, Lin, Weicheng, Wang, Zhu, Li, Shunning, Pan, Feng, Zheng, Jiaxin
Format: Article
Language:English
Subjects:
Cathodes
Cations
Chemistry and Materials Science
Chemistry/Food Science
Electric vehicles
Flux density
Lithium-ion batteries
Materials Science
Rechargeable batteries
Redox reactions
Thermal stability
Transition metals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The development of next-generation layered oxide cathodes for high-energy-density electrical vehicle Li-ion batteries (LIBs) is an urgent topic. The existing method is achieved by continuously increasing the Ni contents of Ni-based layered oxides, but it has been limited to LiNiO 2 . To break this limit and attain increased energy densities, a promising strategy, which involves the introduction of excess Li ions into transition metal (TM) layers to form Li-excess compounds Li 2 MO 3 (M is a TM cation), has attracted enormous interest recently. However, another strategy, which has been neglected in recent years, involves the insertion of an extra layer of Li ions between the TM and original Li layers to form Li 2 MO 2 . In this study, typical reversible Li 2 NiO 3 and 1T-Li 2 NiO 2 were selected as two representative cathodes to break the limit of LiNiO 2 , thereby availing comprehensive comparison with LiNiO 2 regarding their overall properties as cathodes from a theoretical perspective. Interestingly, dissimilar to the Ni 3+ /Ni 4+ monoelectron cationic redox associated with LiNiO 2 , a polaronic anionic redox reaction occurs in Li 2 NiO 3 , while a reversible Ni 2+ /Ni 4+ double-electron redox reaction accompanied by insulator-metal transition occurs in Li 2 NiO 2 . Owing to this double-electron cationic activity, Li 2 NiO 2 exhibits absolute advantages over the other two materials (LiNiO 2 and Li 2 NiO 3 ) as cathodes for LIBs in terms of the capacity, energy density, electronic conductivity, and thermal stability, thus rendering it the most promising candidate for next-generation layered oxide cathodes with high energy densities to break the limit of LiNiO 2 .
ISSN:2095-8226
2199-4501
DOI:10.1007/s40843-021-1827-x