Optimized Temperature Effect of Li‐Ion Diffusion with Layer Distance in Li(NixMnyCoz)O2 Cathode Materials for High Performance Li‐Ion Battery

作者：Suihan Cui, Yi Wei, Tongchao Liu, Wenjun Deng, Zongxiang Hu, Yantao Su, Hao Li, Maofan Li, Hua Guo, Yandong Duan, Weidong Wang, Mumin Rao, Jiaxin Zheng, Xinwei Wang, Feng Pan · 发表于：Advanced Energy Materials · 年份：2015 · DOI：10.1002/aenm.201501309 · 被引用次数：257 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

Understanding and optimizing the temperature effects of Li‐ion diffusion by analyzing crystal structures of layered Li(NixMnyCoz)O2 (NMC) (x + y + z = 1) materials is important to develop advanced rechargeable Li‐ion batteries (LIBs) for multi‐temperature applications with high power density. Combined with experiments and ab initio calculations, the layer distances and kinetics of Li‐ion diffusion of LiNixMnyCozO2 (NMC) materials in different states of Li‐ion de‐intercalation and temperatures are investigated systematically. An improved model is also developed to reduce the system error of the “Galvanostatic Intermittent Titration Technique” with a correction of NMC particle size distribution. The Li‐ion diffusion coefficients of all the NMC materials are measured from −25 to 50 °C. It is found that the Li‐ion diffusion coefficient of LiNi0.6Mn0.2Co0.2O2 is the largest with the minimum temperature effect. Ab initio calculations and XRD measurements indicate that the larger Li slab space benefits to Li‐ion diffusion with minimum temperature effect in layered NMC materials.