Abstract
The cathode, a crucial constituent part of Li-ion batteries, determines the output voltage and integral energy density of batteries to a great extent. Among them, Ni-rich LiNixCoyMnzO2 (x + y + z = 1, x ≥ 0.6) layered transition metal oxides possess a higher capacity and lower cost as compared to LiCoO2, which have stimulated widespread interests. However, the wide application of Ni-rich cathodes is seriously hampered by their poor diffusion dynamics and severe voltage drops. To moderate these problems, a nanobrick Ni-rich layered LiNi0.6Co0.2Mn0.2O2 cathode with a preferred orientation (110) facet was designed and successfully synthesized via a modified co-precipitation route. The galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy (EIS) analysis of LiNi0.6Co0.2Mn0.2O2 reveal its superior kinetic performance endowing outstanding rate performance and long-term cycle stability, especially the voltage drop being as small as 67.7 mV at a current density of 0.5 C for 200 cycles. Due to its unique architecture, dramatically shortened ion/electron diffusion distance, and more unimpeded Li-ion transmission pathways, the current nanostructured LiNi0.6Co0.2Mn0.2O2 cathode enhances the Li-ion diffusion dynamics and suppresses the voltage drop, thus resulting in superior electrochemical performance.
Highlights
The pursuit of environmental protection and low carbon emission has been causing a daily increasing requirement of high-value ratio energy storage devices
Lithium-ion batteries (LIBs) with long cycle life, and high energy density and working potential have been occupying a high proportion of the commercial battery market [1,2,3]
The intensity data collected by XRD was analyzed by the Rietveld improved program-General Structural Analysis System-I (GSAS-I) software package
Summary
The pursuit of environmental protection and low carbon emission has been causing a daily increasing requirement of high-value ratio energy storage devices. There are many factors that including cation mixing, phase transition, loss of lattice oxygen, particle cracking, electrolyte decomposition, electrode/electrolyte parasitic reaction, transition metal dissolution and surface reconstruction could influence the voltage drops, charge transfer rate, and cycle-stability of cathode during long-term charge/discharge process [4,8,13,14,15,16,17,18].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
