Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (11): 3784-3795.doi: 10.19799/j.cnki.2095-4239.2024.0432

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Advancements in the modification of high-voltage Ni-rich ternary cathode material LiNi0.8Co0.1Mn0.1O2 for lithium-ion batteries

Boyu LIU(), Qing PANG, Tengfei WANG, Hongyu WANG()   

  1. College of Mechanical Engineering, Qinghai University, Xining 810016, Qinghai, China
  • Received:2024-05-15 Revised:2024-06-03 Online:2024-11-28 Published:2024-11-27
  • Contact: Hongyu WANG E-mail:lby1755825225@163.com;HYuWang26@163.com

Abstract:

With the increasing global demand for energy, the development and utilization of new energy sources have become pressing challenges. To address energy concerns, lithium-ion batteries have seen rapid advancements over the past few decades and are now widely used in electronic devices and vehicle power supplies. The high-nickel ternary cathode material LiNi0.8Co0.1Mn0.1O2 (NCM811) is considered one of the most promising cathode materials for next-generation lithium-ion batteries due to its high energy density and cost-effectiveness. Increasing the operating voltage can significantly enhance the energy density of this electrode material. However, under high voltage, the structural stability of NCM811 is compromised due to issues such as cation mixing, crack formation and propagation, lattice oxygen release, side reactions, and lattice distortion caused by electrolyte contact. These factors lead to irreversible phase transitions, severe capacity degradation, and a sharp decline in cycling performance, hindering the large-scale application of high-voltage NCM811. This paper reviews the latest research on modification strategies for NCM811 under high voltage. It begins with an overview of the failure mechanisms of NCM811 at high voltage, followed by a discussion on how element doping, surface coating, and composite modification strategies impact its electrochemical performance and the mechanisms by which these modifications improve stability. Finally, the paper explores future directions for NCM811 improvement strategies, proposing feasible, application-oriented solutions for various modification approaches.

Key words: LiNi0.8Co0.1Mn0.1O2, cathode material, element doping, surface coating, composite modification strategy

CLC Number: