Retarding the capacity fading and voltage decay of Li-rich Mn-based cathode materials a compatible layer coating for high-performance lithium-ion batteries.

Li-rich Mn-based layered oxides have been considered as the most promising cathode candidate for high energy density lithium ion batteries. However, the practical application of Li-rich Mn-based layered oxides is hindered due to the capacity fading and voltage decay accompanied with structure transition from the layered structure to spinel phase during cycling. Herein, a facile surface structure repair Ce modification is reported.

Aluminum and polyanion-doping to improve structural and moisture stability of Ni-rich layered oxides for lithium-ion batteries.

Ni-rich layered materials LiNiCoMnO attracts extensive interest to build high-performance lithium-ion batteries, but ground challenges, , unfavorable phase transfer and interfacial parasitic reactions during cycling, especially after being exposure to the air for a long time, greatly limit their practical utilization. Here, we prove that those issues of Ni-rich layered materials can be alleviated by concurrently incorporating the Al and PO, and conduct corresponding comprehensive studies to explore mechanisms of the enhanced electrochemical performances. It is suggested that the phase transition (H2 to H3) that related to the lattice contraction can be suppressed after Al and PO co-doping, leading to improved cycling stability.

Enhancing the reversibility of the chemical evolution of the Ni-rich LiNiCoMnO cathode a simple pre-oxidation process.

For developing commercially viable LiNiMnCoO (NCM), it is necessary to alleviate the irreversible chemical process upon Li-ion insertion/extraction, which primarily accounts for prevailing capacity loss, impedance buildup as well as low columbic efficiency. To resolve this issue, we herein propose a simple but novel method to alter the chemical composition by a facile treatment of HO, which remarkably reduces the cation mixing of Li/Ni and residual lithium on the cathode. The tailored composition contributes great resistance to the structural reconstruction and enhancement in structural reversibility, as shown by Raman and high-resolution transmission electron microscope (HRTEM) results.