A potassium/chloride ion co-doped cathode material Li1.18K0.02Ni0.2Mn0.6O1.98Cl0.02 with enhanced electrochemical performance for lithium ion batteries

Regulating Anion Redox and Cation Migration to Enhance the Structural Stability of Li-Rich Layered Oxides

“…As an important part of the anion doping strategy, chlorine (Cl) doping is deemed as an effective method to improve the electrochemical performance of layered cathodes. It is generally recognized that a Cl ion with a larger radius (0.181 nm) can replace oxygen anions and generate a stronger TM–Cl bond, which promotes the rapid migration of Li + and inhibits the release of oxygen and the dissolution of transition metals during the cycle. − Kim et al reported that the decreased impurity phases, which formed by the mixing of Li + and Ni 2+ during material preparation, were accountable for the observed high reversible capacity and superior rate capability . However, the working mechanism of Cl doping on the oxygen redox of Li-rich cathodes is still under debate, and the effective regulation of oxygen redox reactions is therefore challenging.…”

Improved Electrochemical Performance of a Li1.2Ni0.2Mn0.6O2 Cathode by a Hydrothermal Method with a Metal–Organic Framework as a Precursor

“…The M-LLO samples show higher redox peaks both in the first and second curves compared to the H-LLO samples, which can be attributed to the higher specific surface area and lower impedance of M-LLO. On the other hand, the M-LLO curve shows a smaller peak separation between the anodic and cathodic current peaks, indicating improved Li + transporting kinetics . These can explain why M-LLO exhibits higher capacity and better rate capability.…”

“…On the other hand, the M-LLO curve shows a smaller peak separation between the anodic and cathodic current peaks, indicating improved Li + transporting kinetics. 40 These can explain why M-LLO exhibits higher capacity and better rate capability. be fundamentally solved, the service life of the battery has been extended.…”