In Situ Surface Coating and Oxygen Vacancy Dual Strategy Endowing a Li-Rich Li_1.2Mn_0.55Ni_0.11Co_0.14O₂ Cathode with Superior Lithium Storage Performance

Abstract

Lithium-rich Mn-based cathode materials are widely regarded as the next-generation cathode materials for high-energy-density lithium-ion batteries owing to their low cost and high specific capacity. Nonetheless, their commercial application is seriously hindered by low initial Coulombic efficiency, capacity loss, and voltage drop during long-term cycling. Herein, surface phosphorus doping and a mixture protective layer with oxygen vacancies (OVs) which consists of Li 3 PO 4 and LiMnPO 4 as a surfacecoating layer on the Li 1.2 Mn 0.55 Ni 0.11 Co 0.14 O 2 cathode material through a facile solid− gas reaction treatment, which can simultaneously optimize the surface chemical structure and deplete lithium impurity, is proposed. What is more, the dual strategy of surface engineering and OVs can improve electronic conductivity and regulate the ion diffusion rate. The dual-modified sample expresses a discharge capacity of 180.9 mA h g −1 with a capacity retention of 89.2% at 0.5 C after 250 cycles, which is better than that of the pristine sample (63.7%). This work provides a facile and effective method for surface coating design to improve other Li-rich manganese-based cathodes for rechargeable batteries.

Morphology-Tuned Porous Lithium-Rich Cathode Materials Synthesized via a Solvothermal Approach for Li-Ion Battery Application

“…The adjacent splits at (006)/(012) and (018)/(110) of all of the samples indicate a well-layered structure. The c/a ratio and cation mixing degree of Li + /Ni 2+ are two main factors used widely to estimate the LMR layered structure. − We have calculated them using Jade software (see Table S1) and concluded that even the LMR-MS2 sample exhibits some slight Li + /Ni 2+ mixing degree. This might have unfavorable effects on lithium-ion diffusion.…”

Conductive Robust Interfaces with Fluoro‐Borate Based Electrolyte Additive for 4.6 V Well‐Cycled LiNi0.90Co0.06Mn0.04O2||Li Batteries

“…[ 1 ] Among potential cathode materials for LIBs, Ni‐rich layered oxide ternary cathode materials are the most promising due to their excellent overall properties, such as high‐energy‐density, good cycling performance, and moderate cost. [ 2,3 ] As reported, the energy density of Ni‐rich layered oxides materials can be further improved by increasing the Ni content and the upper cut‐off voltage. However, the structure of the Ni‐rich layered oxides material becomes unstable under high voltage, which prevents the full utilization of its lithium storage capacity.…”

High-Performance Layered CaV4O9-MXene Composite Cathodes for Aqueous Zinc Ion Batteries

“…The energy crisis and environmental pollution make the development of large-scale energy storage systems imminent. Lithium-ion batteries (LIBs) dominate the energy storage field of 3C electronics and the electric vehicle industry [1][2][3][4]. Nevertheless, the limited resources of lithium, safety, and high cost dramatically hinder the future sustainability of lithium-ion batteries [5][6][7].…”