Ti doping enhances performance of high Ni cathodes
January 19, 2020
(a) Rietveld refinement of Ti doped LiNi0.8Co0.2O2 (b) Enhanced cyclability with Ti doping (c) schematics showing how doping effects at the cathode surface lead to improved performance.
Scientific Achievement
It is established that Ti doping of high Ni cathodes such as LiNi0.8Co0.2O2 produces a disordered layered structure at the particle surfaces with enhanced exchange of Li+ and Ni2+. This leads to corrosion resistance and enhanced electrochemical performance.
Significance and Impact
The method of Ti-doping described in this study can lead to Li ion batteries with extended life and much improved performance.
Research Details
- The structure of Ti substituted LiNi0.8Co0.2O2 has been determined using neutron diffraction (ND).
- TEM verified the presence of the disordered layer on particle surfaces.
- ab inito calculations using ND results showed the structure to be stable on particle surfaces.
- Coin cells were used to verify the electrochemical
D. Kong, J. Hu, Z. Chen, et al., Adv. Energy Materials, 9, 41, 1901756 (2019)
