Suppressing interfacial structure failure of Ni-rich cathode materials under high work voltage towards improved cycling stability enabled via Li2MnO3-based surface construction
摘要
In the present study, an ammonia complexation-oxidation-homogeneous precipitation-assisted high-temperature solid phase approach was used to constructing evenly connected Li2MnO3 surface on LiNi0.8Co0.1Mn0.09Al0.01O2 (NCMA) cathode materials. The structural stability of NCMA and the cycling performance at high cut-off voltages were greatly improved by the advantages of the high voltage (below 4.5 V) stability of Li2MnO3-based surface. 5%M-NCMA, obtained from Ni0.8Co0.1Mn0.09Al0.01(OH)2 precursors coated with 5 wt % of Mn3O4 uniformly, showed improved electrochemical performance, which shows initial discharge specific capacities of 215.06 and 224.30 mAh g−1 at high voltage ranges of 3.0–4.5 V and 3.0–4.8 V at 0.1 C, respectively. The capacity retention of 5%M-NCMA after 200 cycles at a rate of 1 C rate under the reinforcement of the high voltage stable table interface is 83.89 and 78.09% under 4.5 and 4.8 V, which were enhanced relative by 8.39% and 32.75% relative to the uncoated samples.
Graphical Abstract