An effective dual-modification strategy to enhance the performance of LiNi0.6Co0.2Mn0.2O2 cathode for Li-ion batteries
- 10 February 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Nanoscale
- Vol. 13 (8), 4670-4677
- https://doi.org/10.1039/d0nr09010g
Abstract
Ni-rich ternary layered oxides represent the most promising cathodes for lithium ion batteries (LIBs) due to their relatively large specific capacities and high energy/power densities. Unfortunately, their inherent chemical instability and surface side reactions during the charge/discharge processes lead to rapid capacity fading and poor cycling life, which seriously restrict their practical applications. Herein, we report a simple dual-modification strategy for preparing LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials by Li2SnO3 surface coating and Sn4+ gradient doping. The gradient Sn doping stabilizes the layered structure due to the strong Sn–O covalent bond and relieves the Li+/Ni2+ cation disorder by the partial oxidation of Ni2+ to Ni3+. Besides, the ionic and electronic conductive Li2SnO3 coating serves as a protective layer to eliminate the side reactions with electrolyte/air. In LIB testing, the dual-modified NCM622 cathode with 2% Sn delivers an enhanced cycling performance with 88.31% capacity retention after 100 cycles from 3.0 to 4.5 V at 1C compared to the bare NCM622. Meanwhile, the dual-modified NCM622 shows an improved reversible capacity of 136.2 mA h g−1 at 5C and enhanced electrode kinetics. The dual-modification strategy may enable a new approach to simultaneously relieve the interfacial instability and bulk structure degradation of Ni-rich cathode materials for high energy density LIBs.Funding Information
- National Materials Genome Project (2016YFB0700600)
- National Natural Science Foundation of China (21972051)
This publication has 47 references indexed in Scilit:
- Comparative Study of Ni-Rich Layered Cathodes for Rechargeable Lithium Batteries: Li[Ni0.85Co0.11Al0.04]O2 and Li[Ni0.84Co0.06Mn0.09Al0.01]O2 with Two-Step Full Concentration GradientsACS Energy Letters, 2016
- Improved electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material synthesized by citric acid assisted sol-gel method for lithium ion batteriesJournal of Power Sources, 2016
- Effect of Mg doping on the structural and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materialsElectrochimica Acta, 2015
- A global view of the phase transitions of SnO2 in rechargeable batteries based on results of high throughput calculationsJournal of Materials Chemistry A, 2015
- Sn-stabilized Li-rich layered Li(Li0.17Ni0.25Mn0.58)O2 oxide as a cathode for advanced lithium-ion batteriesJournal of Materials Chemistry A, 2015
- Effects of Sn doping on the structural and electrochemical properties of Li1.2Ni0.2Mn0.8O2 Li-rich cathode materialsElectrochimica Acta, 2015
- New Insights into Improving Rate Performance of Lithium‐Rich Cathode MaterialAdvanced Materials, 2015
- Nickel‐Rich Layered Lithium Transition‐Metal Oxide for High‐Energy Lithium‐Ion BatteriesAngewandte Chemie, 2015
- Well-ordered spherical LiNixCo(1−2x)MnxO2 cathode materials synthesized from cobolt concentration-gradient precursorsJournal of Power Sources, 2011
- Stannum doping of layered LiNi3/8Co2/8Mn3/8O2 cathode materials with high rate capability for Li-ion batteriesJournal of Power Sources, 2006