Ni‐rich Cathode Materials for High‐performance Li‐ion Batteries: Challenges, Progress and Perspectives

Abstract

Ni‐rich layered ternary oxides are considered as one of optimal cathode materials for lithium‐ion batteries because of high energy density and low raw material cost. However, their local structural defect, microstructural destruction and poor interfacial stability deteriorate the specific energy density, lifespan and safety of batteries. Therefore, understanding the root cause of failure and clarifying their relationship in depth can pave the way to promoting the modification and application of Ni‐rich cathode materials (NRCM). In this review, the chain‐like failure of NRCM triggered by multiple‐scaled structure variations are systematically analyzed based on their fundamental characteristic. Subsequently, current tailoring strategies of NRCM at different size scales are especially discussed. Finally, along with the concluding remarks and remaining challenges, the future development possibilities are discussed to stimulate the commercialization of NRCM.

Graphene/Ta2O5 co‐coating to improve the electrochemical performance of cathode material LiNi0.5Co0.2Mn0.3O2 for lithium‐ion batteries

“…In recent years, lithium‐ion batteries (LIBs) have achieved rapid development, and been practically utilized in portable electronic devices, electric vehicles and stationary energy storage stations in power grids powered by wind and solar radiation [1,2] . In electric vehicle applications, further increasing LIB energy density for long recharge mileage, prolonging cycle‐life, reducing cost, and increasing safety have become major efforts in research and development [3–7] . As recognized, the cathode materials, LiNi 1−x−y Co x Mn y O 2 (NCM), are the major contributors in achieving high energy density of the LIBs due to their high reversible capacities (>200 mAh g −1 ), high electrode potentials (≥4.3 V vs. Li/Li + ) [8,9]…”

“…[1,2] In electric vehicle applications, further increasing LIB energy density for long recharge mileage, prolonging cycle-life, reducing cost, and increasing safety have become major efforts in research and development. [3][4][5][6][7] As recognized, the cathode materials, LiNi 1À xÀ y Co x Mn y O 2 (NCM), are the major contributors in achieving high energy density of the LIBs due to their high reversible capacities (> 200 mAh g À 1 ), high electrode potentials (� 4.3 V vs. Li/Li + ). [8,9] Among NCM cathode materials with different compositions, LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) has been used for in terms of practical applications.…”