A facile structure design of concentration-gradient LiNi0.80Co0.15Al0.05O2 cathode material for lithium-ion batteries via controlling the flow rate of Al solution

In this work, we have explored the design of a new concentration-gradient LiNi(0.80)Co(0.15)Al(0.05)O(2 )cathode material, which was successfully synthesized via sintering the mixture of core/shell precursor and LiOH center dot H2O in O-2. The precursor LiNi0.80Co0.15Al0.05(OH)(2) was synthesized via co-precipitation by controlling the flow rate of the aluminum solution has a core of NimCa1-m(OH)(2) (m = 0.88 or 0.92) and the outerlayer of Ni1.6-mCom-0.7Al0.10(OH)(2). The results indicate that the lattice misfits between the core precursor and core/shell one is relatively small, which make NixCoyAl1-x-y(OH)(2) uniformly and efficiently on NimCa1-m(OH)(2) precursors by controlling the flow rate of the Al solution. The concentration of main elements of LiNi0.80Co0.15Al0.05O2 changes gradually from the center to the particle surface. The material displays a discharge capacity of 198.6 mAh g(-1) (m = 0.88) and 187.8 mAh g(-1) (m = 0.92) at 0.2C, which are lower than the homogeneous LiNi0.80Co0.15Al0.05O2 (NCA-H) with 205.8 mAh.g(-1). In addition, it also shows excellent capacity retention of 70.3% and 78.9% at 1C after 200 cycles respectively, which are much better than NCA-H with 54.6%. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

In this study, a new concentration-gradient LiNi(0.80)Co(0.15)Al(0.05)O(2) cathode material was designed and synthesized, showing promising discharge capacity and excellent capacity retention after cycling.