Alleviating the Kinetic Hindrance of Ni-Rich Single-Crystal Cathode Materials Driven by Local Structural Realignment.

Crack-free Ni-rich single-crystal cathodes exhibit exceptional stability; however, they encounter challenges pertaining to kinetic hindrance, low capacity, and low initial Coulombic efficiency. Herein, we present a melt infiltration-dispersion method for synthesizing a small-sized single-crystal LiNiCoMnO (N90-SC) material at lower temperatures, enabling kilogram-scale production. The inclusion of low-melting LiOH-LiSO eutectic salt enhances uniform mass and heat transfer while penetrating the grain boundaries of secondary particles, thereby inhibiting particle growth and resulting in small single crystals after washing.

Customized Li Solvation Sheath at the Poly(ethylene oxide)-Based Electrolyte/Ultrahigh-Nickel Cathode Interface toward Room-Temperature Solid-State Lithium Batteries.

The matching of poly(ethylene oxide) (PEO)-based electrolytes with ultrahigh-nickel cathode materials is crucial for designing new-generation high-energy-density solid-state lithium metal batteries (SLMBs), but it is limited by serious interfacial side reactions between PEO and ultrahigh-nickel materials. Here, a high-concentration electrolyte (HCE) interface with a customized Li solvation sheath is constructed between the cathode and the electrolyte. It induces the formation of an anion-regulated robust cathode/electrolyte interface (CEI), reduces the unstable free-state solvent, and finally achieves the compatibility of PEO-based electrolytes with ultrahigh-nickel cathode materials.

A Fresh One-Step Spray Pyrolysis Approach to Prepare Nickel-Rich Cathode Material for Lithium-Ion Batteries.

The Ni-rich layered cathode material LiNiCoMnO (NCM811) with high specific capacity and acceptable rate performance is one of the key cathode materials for high-energy-density lithium-ion batteries. Coprecipitation, the widely utilized method in the precursor synthesis of NCM811 materials, however, suffers long synthetic processes and challenges in uniform element distribution. The spray pyrolysis method is able to prepare oxide precursors in seconds where all transition-metal elements are well distributed, but the difficulty of lithium distribution will also arise when the lithium salts are added in the subsequent sintering process.

Multi-scale boron penetration toward stabilizing nickel-rich cathode.

Nickel-rich layered oxides LiNi Co Mn O ( ≥ 0.8) have been recognized as the preferred cathode materials to develop lithium-ion batteries with high energy density (>300 Wh kg). However, the poor cycling stability and rate capability stemming from intergranular cracks and sluggish kinetics hinder their commercialization.

Research Progress of Single-Crystal Nickel-Rich Cathode Materials for Lithium Ion Batteries.

Single-crystal nickel-rich cathode materials (SC-NRCMs) are the most promising candidates for next-generation power batteries which enable longer driving range and reliable safety. In this review, the outstanding advantages of SC-NRCMs are discussed systematically in aspects of structural and thermal stabilities. Particularly, the intergranular-crack-free morphology exhibits superior cycling performance and negligible parasitic reactions even under severe conditions.