In this work, the effect of various gradient electrodes on the electrochemical performance of Li-ion batteries was investigated both theoretically and experimentally. A modified 2D model was developed to investigate the effects of different electrode structures on the lithiation process.
Thick electrodes whose active materials have high areal density may improve the energy densities of lithium-ion batteries. However, the weakened rate abilities and cycle lifetimes of such electrodes significantly limit their practical applications.
The development of vertically aligned structures with thick electrodes is a viable method for enhancing the electrochemical performance of lithium-ion batteries . Huang et al. manufactured ultrathick (900 μm) cathodes with pore arrays aligned in the thickness direction using a scalable ice-templating technique.
The simulation results indicate that the gradient electrode structure can enhance the utilization of electrode particles on the current collector side and alleviate the nonuniformity of the solid-phase Li concentration along the thickness direction.
Use the link below to share a full-text version of this article with your friends and colleagues. Lithium-rich layered oxides (LLOs) are prospective cathode materials for next-generation lithium-ion batteries (LIBs), but severe voltage decay and energy attenuation with cycling still hinder their practical applications.
On the basis of dual-gradient graphite anode, we demonstrate extremely fast-charging lithium ion battery realizing 60% recharge in 6 min and high volumetric energy density of 701 Wh liter −1 at the high charging rate of 6 C.