Superior Long-Term Energy Retention and Volumetric Energy Density for Li-Rich Cathode Materials
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- Superior Long-Term Energy Retention and Volumetric Energy Density for Li-Rich Cathode Materials
- Oh, Pilgun; Myeong, Seungjun; Cho, Woongrae; Lee, Min-Joon; Ko, Minseong; Jeong, Hu Young; Cho, Jaephil
- Issue Date
- AMER CHEMICAL SOC
- NANO LETTERS, v.14, no.10, pp.5965 - 5972
- 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 mu m-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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