Cathode
Material with Nanorod StructureAn
Application for Advanced High-Energy and Safe Lithium Batteries
- Publication date
- Publisher
Abstract
We have developed a novel cathode
material based on lithium–nickel–manganese–cobalt
oxide, where the manganese concentration remains constant throughout
the particle, while the nickel concentration decreases linearly and
the cobalt concentration increases from the center to the outer surface
of the particle. This full concentration gradient material with a
fixed manganese composition (FCG–Mn-F) has an average composition
of Li[Ni<sub>0.60</sub>Co<sub>0.15</sub>Mn<sub>0.25</sub>]O<sub>2</sub> and is composed of rod-shaped primary particles whose length reaches
2.5 μm, growing in the radial direction. In cell tests, the
FCG–Mn-F material delivered a high capacity of 206 mAh g<sup>–1</sup> with excellent capacity retention of 70.3% after
1000 cycles at 55 °C. This cathode material also exhibited outstanding
rate capability, good low-temperature performance, and excellent safety,
compared to a conventional cathode having the same composition (Li[Ni<sub>0.60</sub>Co<sub>0.15</sub>Mn<sub>0.25</sub>]O<sub>2</sub>), where
the concentration of the metals is constant across the particles
