Loading…

Superior Long-Term Energy Retention and Volumetric Energy Density for Li-Rich Cathode Materials

Li-rich materials are considered the most promising for Li-ion battery cathodes, as high energy densities can be achieved. However, because an activation method is lacking for large particles, small particles must be used with large surface areas, a critical drawback that leads to poor long-term ene...

Full description

Saved in:
Bibliographic Details
Published in:Nano letters 2014-10, Vol.14 (10), p.5965-5972
Main Authors: Oh, Pilgun, Myeong, Seungjun, Cho, Woongrae, Lee, Min-Joon, Ko, Minseong, Jeong, Hu Young, Cho, Jaephil
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Li-rich materials are considered the most promising for Li-ion battery cathodes, as high energy densities can be achieved. However, because an activation method is lacking for large particles, small particles must be used with large surface areas, a critical drawback that leads to poor long-term energy retention and low volumetric energy densities. Here we propose a new material engineering concept to overcome these difficulties. Our material is designed with 10 μm-sized secondary particles composed of submicron scaled flake-shaped primary particles that decrease the surface area without sacrificing rate capability. A novel activation method then overcomes the previous limits of Li-rich materials with large particles. As a result, we attained high average voltage and capacity retention in turn yielding excellent energy retention of 93% during 600 cycles. This novel and unique approach may furthermore open the door to new material engineering methods for high-performance cathode materials.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl502980k