Cobalt‐Free High‐Capacity Ni‐Rich Layered Li[Ni_0.9Mn_0.1]O₂ Cathode

Abstract

Li[Ni0.9Co0.1]O2 (NC90), Li[Ni0.9Co0.05Mn0.05]O2 (NCM90), and Li[Ni0.9Mn0.1]O2 (NM90) cathodes are synthesized for the development of a Co‐free high‐energy‐density cathode. NM90 maintains better cycling stability than the two Co‐containing cathodes, particularly under harsh cycling conditions (a discharge capacity of 236 mAh g−1 with a capacity retention of 88% when cycled at 4.4 V under 30 °C and 93% retention when cycled at 4.3 V under 60 °C after 100 cycles). The reason for the enhanced stability is mainly the ability of NM90 to absorb the strain associated with the abrupt anisotropic lattice contraction/extraction and to suppress the formation of microcracks, in addition to enhanced chemical stability from the increased presence of stable Mn4+. Although the absence of Co deteriorates the rate capability, this can be overcome as the rate capability of the NM90 approaches that of the NCM90 when cycled at 60 °C. The long‐term cycling stability of NM90 is confirmed in a full cell, demonstrating that it is one of the most promising Co‐free cathodes for high‐energy‐density applications. This study not only provides insight into redefining the role of Mn in a Ni‐rich cathode, it also represents a clear breakthrough in achieving a commercially viable Co‐free Ni‐rich layered cathode.

Recent Progress and Perspective of Advanced High‐Energy Co‐Less Ni‐Rich Cathodes for Li‐Ion Batteries: Yesterday, Today, and Tomorrow

“…g) Magnified cross‐sectional SEM images of the first charged state of the NM90 cathode at 4.3 V. Reproduced with permission. [ 55 ] Copyright 2019, John Wiley and Sons.…”

“…Meanwhile, the extent of microcracking decreased, despite the small amount of dopant in the LiNiO 2 , suggesting the damage to the cathode was limited to hairline microcracks emanating from the particle center and was only visible when the cathode was charged to 4.3 V (Figure 3g). [ 55 ]…”

A Promising Hard Carbon−Soft Carbon Composite Anode with Boosting Sodium Storage Performance

“…The apparent (002) and (100) diffraction modes in HC were observed at 22.9°and 43°, respectively, corresponding to the interlayer and the in-plane atomic correlations of the graphene sheets in the graphitic domain. [33] As a comparison, SC presents a narrower and sharper (002) Figure 1. XRD patterns of HC-SC, HC and SC.…”

Ni‐Rich/Co‐Poor Layered Cathode for Automotive Li‐Ion Batteries: Promises and Challenges

“…From the development situation, the proportion of nickel in the NCM materials is increasing continually (over 90%) with the decrease of Co and Mn. In very recently, Aishova et al synthesized and compared the physicochemical properties of LiNi 0.9 Co 0.05 Mn 0.05 O 2 (NCM90), LiNi 0.9 Mn 0.1 O 2 (NM90), and LiNi 0.9 Co 0.1 O 2 (NC90) 39. NM90 exhibits better cycling stability, and it shows the approaching rate capability with NCM90 when temperature up to 60 °C.…”

“…In very recently, Aishova et al synthesized and compared the physicochemical properties of LiNi 0.9 Co 0.05 Mn 0.05 O 2 (NCM90), LiNi 0.9 Mn 0.1 O 2 (NM90), and LiNi 0.9 Co 0.1 O 2 (NC90). [39] NM90 exhibits better cycling stability, and it shows the approaching rate capability with NCM90 when temperature up to 60 °C. The study may redefine the role of Mn in a Ni-rich NCM cathode.…”