Challenges and Opportunities for Implementing High-Nickel Cathode Materials in High-Performance Li-ion Cells

摘要

1. It is now accepted that high-nickel cathode materials are critical for enabling high energy density batteries for xEVs, and these materials are here now. 2. High-nickel cathodes combine high discharge capacity and average voltage (energy) with high rate (power), and are suitable for a wide range of Li-ion batteries. 3. It is possible to achieve > 700 Wh/L at the cell level with high-Ni cathode / graphite anode. 4. With the selection of suitable inactive components, it is possible to obtain long life Li-ion cells with these materials. 5. When comparing rate capability of active materials, we recommend the following: a. High rate separators b. Electrodes with porosity of at least 30 % c. Maximum current densities less than 6 mA/cm~2 d. Electrodes with identical mAh/cm~2 for the different materials. 6. We recommend using methanol for estimating LiOH content of high-Ni cathode materials.