Lithium-Ion Conductor Li₂ZrO₃-Coated Primary Particles To Optimize the Performance of Li-Rich Mn-Based Cathode Materials

Abstract

A lithium-rich manganese-based cathode material (LRMC) is currently considered as one of the most promising next-generation materials for lithium-ion batteries, which has received much attention, but the LRMC still faces some key scientific issues to break through, such as poor rate capacity, rapid voltage, capacity decay, and low first coulomb efficiency. In this work, homogeneous Li2ZrO3 (LZO) was successfully coated on the surface of Li1.2Mn0.54Ni0.13Co0.13O2 (LRO) by molten salt-assisted sintering technology. Li2ZrO3 has good chemical and electrochemical stability, which can effectively inhibit the side reaction between electrode materials and electrolytes and reduce the dissolution of transition metal ions. Thus, the as-prepared LRO@LZO composites are expected to improve the cycling performance. It can be found that the discharge specific capacity of LRO is 271 mAh g–1 at 0.1 C, and the capacity retention rate is still 93.7% after 100 cycles at 1 C. In addition, Li2ZrO3 is an excellent lithium-ion conductor, which is prone to increasing the lithium-ion transfer rate and improving the rate capacity of LRO. Therefore, this study provides a new solution to improve the structure stability and electrochemical performance of LRMCs.

High-Area-Capacity Cathode by Ultralong Carbon Nanotubes for Secondary Binder-Assisted Dry Coating Technology

“…Rechargeable lithium-ion batteries (LIBs) have attracted significant attention due to their high energy densities, favorable cycle stabilities, and cost-effectiveness. − To meet the requirements for wide applications, continuous efforts have been devoted to improving the performance of LIBs for nearly half a century now. To enhance the energy density of LIBs, a concerted effort has been devoted to the discovery of new materials with specific capacity, such as nickel-rich layered cathodes, Li-rich Mn-based cathodes, , and metal anodes. − For example, the energy density could achieve a specific energy of 440 Wh kg –1 by the Li | LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) pouch cell (5.3 Ah) . However, persistent issues such as poor cycling stability and safety concerns continue to hinder the commercial viability of these promising electrode materials.…”