Layered Ni-rich materials, LiNi1-x-yCoxAlyO2 (NCA), due to their low cost, low toxicity and high energy density, have been considered as very promising candidates for large-scale applications such as electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid vehicles (PHEVs). Howev...
Layered Ni-rich materials, LiNi1-x-yCoxAlyO2 (NCA), due to their low cost, low toxicity and high energy density, have been considered as very promising candidates for large-scale applications such as electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid vehicles (PHEVs). However, the low initial coulombic efficiency and severe capacity fading during charge-discharge cycles are unsatisfactory. To resolve these issues, different metals such as Mn, Mg, and Fe have been studied as dopants/partial substitutes for Ni in previous literature.
In this study, first, NCA cathode material (Li1.05Ni0.85Co0.10Al0.05O2) was successfully prepared by hydrothermal reaction. In order to improve the electrochemical properties of NCA cathode materials, transition metals Mn and Ti were doped in NCA during the first synthesis step. Among them, Ti-doped NCA-Ti cathode material provides a good crystalline structure and possesses a higher electrical conductivity than that of the other samples. In addition, the NCA-Ti electrode exhibits improved electrochemical performance with the best discharge capacity of 179.6 mAh/g at first cycle and initial coulombic efficiency of 88.6%.
In the second part, boron and cobalt were directly doped to commercial Li1.06Ni0.91Co0.08Al0.01O2 (c-NCA) cathode material with high Ni content to improve the capacity and lifetime characteristics. After doping, the physical and electrochemical properties of the anode material were analyzed. The initial discharge capacities of the boron and cobalt doped c-NCA-B and c-NCA-Co were found to be 214 mAh/g and 200 mAh/g, respectively, which are higher values than that of the raw c-NCA cathode material. In particular, c-NCA-Co exhibits the best discharge capacity of 157 mAh/g even after 20 cycles.
Layered Ni-rich materials, LiNi1-x-yCoxAlyO2 (NCA), due to their low cost, low toxicity and high energy density, have been considered as very promising candidates for large-scale applications such as electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid vehicles (PHEVs). However, the low initial coulombic efficiency and severe capacity fading during charge-discharge cycles are unsatisfactory. To resolve these issues, different metals such as Mn, Mg, and Fe have been studied as dopants/partial substitutes for Ni in previous literature.
In this study, first, NCA cathode material (Li1.05Ni0.85Co0.10Al0.05O2) was successfully prepared by hydrothermal reaction. In order to improve the electrochemical properties of NCA cathode materials, transition metals Mn and Ti were doped in NCA during the first synthesis step. Among them, Ti-doped NCA-Ti cathode material provides a good crystalline structure and possesses a higher electrical conductivity than that of the other samples. In addition, the NCA-Ti electrode exhibits improved electrochemical performance with the best discharge capacity of 179.6 mAh/g at first cycle and initial coulombic efficiency of 88.6%.
In the second part, boron and cobalt were directly doped to commercial Li1.06Ni0.91Co0.08Al0.01O2 (c-NCA) cathode material with high Ni content to improve the capacity and lifetime characteristics. After doping, the physical and electrochemical properties of the anode material were analyzed. The initial discharge capacities of the boron and cobalt doped c-NCA-B and c-NCA-Co were found to be 214 mAh/g and 200 mAh/g, respectively, which are higher values than that of the raw c-NCA cathode material. In particular, c-NCA-Co exhibits the best discharge capacity of 157 mAh/g even after 20 cycles.
주제어
#Lithium ion battery NCA Doping Boron Cobalt Manganese Titanium
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