Suppressed Internal Intrinsic Stress Engineering in High?Performance Ni?Rich Cathode Via Multilayered In Situ Coating Structure

LiNixCoyAlzO2(NCA) cathode materials are drawing widespread attention, but the huge gap between ideal and present cyclic stability still hinders their further commercial application, especially for Ni-rich LiNixCoyAlzO2 (x > 0.8, x + y z = 1) material, which is owing to structural degradation particles' intrinsic fracture. To tackle problems, Li0.5La2Al0.5O4 in situ coated Mn compensating doped multilayer LiNi0.82Co0.14Al0.04O2 was prepared. XRD refinement indicates that La–Mn co-modifying could realize appropriate Li/Ni disorder degree. Calculated results patterns reveal LLAO coating layer effectively restrain crack secondary particles benefited from suppressed internal strain. AFM improves as NCA-LM2 has superior mechanical property. The SEM, TEM, XPS tests indicate cycled with LLAO–Mn modification displays a more complete morphology less side reaction electrolyte. DEMS used investigate cathode–electrolyte interface reflected by gas evolution. releases CO2 than NCA-P indexing on stable surface. modified material presents outstanding capacity retention of 96.2% after 100 cycles voltage range 3.0–4.4 V at 1C, 13% higher pristine 80.8% 1 C 300 cycles. This excellent electrochemical performance be attributed fact high chemically (LLAO) enhance doping suppress influence lattice mismatch distortion. We believe it can useful strategy other advanced functional material.