Multiscale Construction of Integrated Lithium ion Transport Channels for High-Rate Ni-Rich Cathode Materials in Lithium ion Batteries.

Ni-rich layered oxide cathodes have garnered significant attention in the field of lithium ion batteries (LIBs) due to their exceptionally high energy density. Nevertheless, their performance in terms of rapid charging/discharging and cycle life remains suboptimal. In this study, an integrated, multi-scale optimization of Li⁺ transport kinetics from the interface to the near-surface layer of Ni-rich cathode materials is achieved through a synergistic optimization strategy of constructing a highly conductive interface layer and a lattice channel optimization layer.

Dual Modification Strategy for Enhanced Cycling and Rate Performance of Ni-Rich Cathode Materials in Lithium-Ion Batteries.

A great challenge in the commercialization process of layered Ni-rich cathode material LiNiCoMnO (NCM, x ≥ 80%) for lithium-ion batteries is the surface instability, which is exacerbated by the increase in nickel content. The high surface alkalinity and unavoidable cathode/electrolyte interface side reactions result in significant decrease for the capacity of NCM material. Surface coating and doping are common and effective ways to improve the electrochemical performance of Ni-rich cathode material.

Tailoring Electric Double Layer by Cation Specific Adsorption for High-Voltage Quasi-Solid-State Lithium Metal Batteries.

The interfacial instability of high-nickel layered oxides severely plagues practical application of high-energy quasi-solid-state lithium metal batteries (LMBs). Herein, a uniform and highly oxidation-resistant polymer layer within inner Helmholtz plane is engineered by in situ polymerizing 1-vinyl-3-ethylimidazolium (VEIM) cations preferentially adsorbed on LiNiCoMnO (NCM83) surface, inducing the formation of anion-derived cathode electrolyte interphase with fast interfacial kinetics. Meanwhile, the copolymerization of [VEIM][BF] and vinyl ethylene carbonate (VEC) endows P(VEC-IL) copolymer with the positively-charged imidazolium moieties, providing positive electric fields to facilitate Li transport and desolvation process.

Electrolyte-assisted low-voltage decomposition of LiCO for efficient cathode pre-lithiation in lithium-ion batteries.

Lithium oxalate (LiCO) is an attractive cathode pre-lithiation additive for lithium-ion batteries (LIBs), but its application is hindered by its high decomposition potential (>4.7 V). Due to the liquid-solid synergistic effect of the NaNO additive and the LiNiCoMnO (NCM) cathode material, the decomposition efficiency of micro-LiCO reaches 100% at a low charge cutoff voltage of 4.