Effects of Cobalt Deficiency on Nickel-Rich Layered LiNi0.8Co0.1Mn0.1O2 Positive Electrode Materials for Lithium-Ion Batteries.
Shuang GaoYang-Tse ChengMona ShirpourPublished in: ACS applied materials & interfaces (2018)
The role of cobalt deficiency on the crystal structure, surface chemistry, and electrochemical performance of Ni-rich layered LiNi0.8Co0.1Mn0.1O2 (NCM811) positive electrode materials was experimentally studied possibly for the first time. We synthesized pristine and cobalt-deficient NCM811 samples by solid-state reaction. Using a variety of characterization techniques and electrochemical measurements, we show that cobalt nonstoichiometry can suppress Ni2+/Li+ cation mixing, but can simultaneously promote the formation of oxygen vacancies, leading to rapid capacity fade and inferior rate capability compared to pristine NCM811. This study provides new insights into the effects of cobalt deficiency on the cation mixing and electrochemical performance of a Ni-rich layered NCM compound.
Keyphrases
- reduced graphene oxide
- metal organic framework
- gold nanoparticles
- solid state
- transition metal
- carbon nanotubes
- ionic liquid
- crystal structure
- molecularly imprinted
- label free
- highly efficient
- room temperature
- ion batteries
- electron transfer
- smoking cessation
- walled carbon nanotubes
- high resolution
- quantum dots
- sensitive detection
- drug discovery