Core–Multishell‐Structured Digital‐Gradient Cathode Materials with Enhanced Mechanical and Electrochemical Durability

• DOI: 10.1002/smll.202100040
• Publication Date: 2021-03-30T07:00:55Z
• Authors: Youngho Shin; Sangjin Maeng; Youngmin Chung; Gregory K. Krumdick; Sangkee Min
• Keywords: Thermal Stability

Abstract Ni‐rich cathode materials provide high energy density, but their structural and surface instability limits cyclability thermal stability. As one of the approaches to mitigate this problem, comprising high‐capacity core wrapped in Mn‐rich multiple shells are produced successfully. In contrast conventional batch‐type process for concentration‐gradient materials, a digital‐gradient cascade coprecipitation described here achieves improvements productivity quality consistency needed move toward large‐scale manufacturing. The core–multishell manner not only have longer cycle life improved rate performance compared homogeneous having same overall composition, also show remarkably enhanced stability low impedance growth characteristics. novel attempt determine correlation between mechanical properties particles electrochemical cyclabilities, breaking force elasticity were successfully measured using statistical approach, which indicates that particle with stable composition as well has capacity retention durability. These results guide realization long through heterogeneous engineering.