Superior long-term energy retention and volumetric energy density for Li-rich cathode materials.
Nano Lett
; 14(10): 5965-72, 2014 Oct 08.
Article
em En
| MEDLINE
| ID: mdl-25180657
ABSTRACT
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.
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MEDLINE
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En
Ano de publicação:
2014
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Article