Improvement of electrochemical performance of high-Ni LiNi0.96Co0.03Mn0.01O2 cathode materials by ALD deposition of ultrathin coatings
ZHENG Yao
LI Jian
WANG Lihua
LI Enxi
Abstract：Nickel-rich layered oxide anodes suffer from inherent structural instability,especially when the nickel content is increased to more than 90%,the cycling performance deteriorates dramatically.In order to solve the serious problem of capacity degradation of high nickel materials under long cycling and large multiplicity,LiNi0.96Co0.03Mn0.01O2(NCM9631)cathode material is used as the object of research in this thesis for the cladding modification study.The coating modification of NCM9631 was carried out using atomic layer deposition technology,in which the TiO2-coated T-NCM9631 samples showed good electrochemical performance,and compared with the original material,the initial discharge specific capacity of T-NCM9631 was increased from 226 to 239 mAh/g,and the capacity retention rate of 100 cycles at 0.5 C was increased from 73.9%to 87.95%.The ultra-thin TiO2 cladding reduces direct contact between the active material and electrolyte,protects the active material T-NCM9631 from HF erosion,and prevents excessive metal dissolution.It effectively prevents the chemical and structural changes on the surface of the material,improves the structural stability of the material,and improves the electrochemical performance of the material.
Keywords：atomic layer depositionlithium-ion batterieshigh-nickel cathode materialsTiO2Al2O3NCM9631
Publication Date：2025-02-24
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 13-18,23 )