High-Rate Structure-Gradient Ni-Rich Cathode Material for Lithium-Ion Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• High compaction density and superior rate performance are critical for advanced cathode materials in lithium-ion batteries.
• Achieving both properties simultaneously presents a significant challenge in materials design.

Purpose of the Study:

• To design and synthesize a structure-gradient LiNi0.8Co0.1Mn0.1O2 cathode material.
• To enhance Li+ transport and electrochemical performance through a hierarchical structure.

Main Methods:

• Secondary co-precipitation method was employed for material synthesis.
• The material features a compacted core and an active-plane-exposing shell structure.

Main Results:

• The synthesized material achieved high compaction density.
• Demonstrated superior rate performance with an excellent rate capability of 160 mA h g-1 at 10 C.
• Achieved a 62% increase in rate capability compared to the pristine material.

Conclusions:

• The structure-gradient design successfully balances high compaction density and enhanced electrochemical performance.
• This approach offers a viable strategy for developing next-generation layered cathode materials for diverse applications.