Details

Autor(en) / Beteiligte

• Oh, Pilgun
• Myeong, Seungjun
• Cho, Woongrae
• Lee, Min-Joon
• Ko, Minseong
• Jeong, Hu Young
• Cho, Jaephil

Titel

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

Ist Teil von

• Nano letters, 2014-10, Vol.14 (10), p.5965-5972

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2014

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.