High Temperature Electrochemical Performance of Monocrystalline High-Nickel Ternary Cathode Material Improved by Co-Doping of Yttrium and Niobium Elements
Aiming at the shortcomings of single crystalline high-nickel ternary cathode material,including high residual alkali on the surface,poor cycle performance at high temperature,co-doping with niobium and yttrium was proposed to modify the cathode material for improving its electrochemical performance.With monocrystalline high-nickel ternary precursor(Ni0.6 Co0.1 Mn0.3(OH)2)as raw material,a series of cathode materials co-doped with two different elements were synthesized by high-temperature solid-state reaction.The results show that the niobium and yttrium co-doped sample presents excellent cycling stability and rate capability at high temperature.Compared to niobium-doped sample,it can have capacity retention rate higher by 2.58 percentage points after 50 cycles at 45℃,and discharge capacity higher by 6.2 mAh/g at 2C charge-discharge rate.
high nickelmonocrystalline ternary cathode materialscathode materialniobium-dopedyttrium-dopedco-dopinghigh-temperature electrochemical performancehigh-temperature solid-state reaction
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