Single‐crystalline Ni‐rich LiNi _{0 . 91} Co _{0 . 06} Mn _{0 . 03} O ₂

Abstract

Despite the commercialization and tremendous attention of the Ni-rich LiN-iCoMnO 2 cathode due to high energy and working voltage, there are still hurdles to be improved. The conventional polycrystalline Ni-rich LiNiCoMnO 2 suffers from decays of specific capacity and energy during long-term cycling. It originates from more deficiency of oxygen and microcracking, resulting in severe phase transition toward disordered rock salt phase. Herein, singlecrystalline Ni-rich LiNi 0.91 Co 0.06 Mn 0.03 O 2 is successfully prepared to overcome these inherent drawbacks of polycrystalline. Benefiting from reduced specific surface area and grain boundaries, single-crystalline Ni-rich LiNi 0.91 Co 0.06 Mn 0.03 O 2 outperforms polycrystalline in all electrochemical performances. The single-crystalline LiNi 0.91 Co 0.06 Mn 0.03 O 2 exhibits not only superior cycle stability of 84.7% at 40 C after 100 cycles but also high-capacity retention of 76.2% under 2 C via improving structural integrity. Therefore, this work reveals that single crystalline can be a breakthrough for stable and high electrochemical performances. K E Y W O R D S decays of specific capacity and energy, deficiency of oxygen and microcracking, Ni-rich LiNiCoMnO 2 , phase transition, single-crystalline

Advanced electrochemical and mechanical performance of a LiNi0.91Co0.06Mn0.03O2 cathode via use of a NaCl flux agent

“…Therefore, the stronger signal of C 2 HO − indicates that the severity of irreversible phase transitions intensifies, resulting in continuous capacity fading. 46 This phenomenon becomes more pronounced with each repeated cycle and exhibits a high correlation with the cycle results. In contrast, SC-NCM maintains its structural integrity after cycling as shown in Fig.…”

Storage Performance and Structure Degradation Mechanism of Single-Crystal Ni-Rich Material

“…4 In comparison with the polycrystal cathode material, the singlecrystal high nickel cathode material (SCNCM) is equipped with better crystallinity and thermal and structural stability 5,6 and can eliminate the risk of intergranular crack. 7,8 However, SCNCM has high air sensitivity, complex preparation processes, and high production costs. 9−11 Therefore, it is vital to explore its evolution patterns of microstructure and properties during long-time air storage, in order to provide guidance for large-scale and high-quality production of SCNCM.…”

“…With the widespread adoption of electric vehicles (EVs), a production line of lithium-ion cathode materials with high output efficiency is in great demand. − After an extensive review of the advantages and disadvantages of all cathode materials on the market, the Ni-based ternary cathode material is identified as one of the most acceptable ones . In comparison with the polycrystal cathode material, the single-crystal high nickel cathode material (SCNCM) is equipped with better crystallinity and thermal and structural stability , and can eliminate the risk of intergranular crack. , However, SCNCM has high air sensitivity, complex preparation processes, and high production costs. − Therefore, it is vital to explore its evolution patterns of microstructure and properties during long-time air storage, in order to provide guidance for large-scale and high-quality production of SCNCM. − …”

Single‐Crystalline Cathodes for Advanced Li‐Ion Batteries: Progress and Challenges

“…[ 42,172 ] Copyright 2010, Taylor & Francis Ltd and Copyright 2021, Elsevier Ltd. Reproduced with permission. [ 173 ] Copyright 2021, Wiley‐VCH. Reproduced with permission.…”