Angewandte Chemie · 2021 · 18 citations · 37 references
EngineeringKinetic HindranceChemistryChemical EngineeringSingle‐crystalline Ni‐rich CathodesSurface Gradient PenetrationSingle‐crystalline Ni‐rich CathodeOxidation StateElectrode Reaction MechanismMaterials EngineeringMaterials ScienceBattery Electrode MaterialsSurface ElectrochemistryAdvanced Electrode MaterialLithium-ion BatteryEnergy StorageSolid-state BatteryElectrochemistryLi-ion Battery MaterialsSurface ScienceCathode MaterialsElectrochemical Energy StorageBatteries
Abstract Single‐crystalline Ni‐rich cathodes are promising candidates for the next‐generation high‐energy Li‐ion batteries. However, they still suffer from poor rate capability and low specific capacity due to the severe kinetic hindrance at the nondilute state during Li + intercalation. Herein, combining experiments with density functional theory (DFT) calculations, we demonstrate that this obstacle can be tackled by regulating the oxidation state of nickel via injecting high‐valence foreign Ta 5+ . The as‐obtained single‐crystalline LiNi 0.8 Co 0.1 Mn 0.1 O 2 delivers a high specific capacity (211.2 mAh g −1 at 0.1 C), high initial Coulombic efficiency (93.8 %), excellent rate capability (157 mAh g −1 at 4 C), and good durability (90.4 % after 100 cycles under 0.5 C). This work provides a strategy to mitigate the Li + kinetic hindrance of the appealing single‐crystalline Ni‐rich cathodes and will inspire peers to conduct an intensive study.
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Electrodes with High Power and High Capacity for Rechargeable Lithium Batteries
Kisuk Kang, Ying Shirley Meng, Julien Bréger et al. · Science · 2006 · 2.6K citations