Butt Annam, Jamil Sidra, Fasehullah Muhammad, Ahmad Haseeb, Tufail Muhammad Khurram, Sharif Rehana, Ali Ghulam
Department of Physics, University of Engineering and Technology, Lahore, 54890, Pakistan.
Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Materials and Energy, Southwest University, Chongqing, 400715, PR China.
Heliyon. 2024 Mar 15;10(7):e28039. doi: 10.1016/j.heliyon.2024.e28039. eCollection 2024 Apr 15.
LiNiCoMnO (NCM) layered oxide is contemplated as an auspicious cathode candidate for commercialized lithium-ion batteries. Regardless, the successful commercial utilization of these materials is impeded by technical issues like structural degradation and poor cyclability. Elemental doping is among the most viable strategies for enhancing electrochemical performance. Herein, the preparation of surface tellurium-doped NCM is done by utilizing the methodology solid-state route at high temperatures. Surface doping of the Te ions leads to structural stability owing to the inactivation of oxygen at the surface via the binding of slabs of transition metal-oxygen. Remarkably, 1 wt% of Te doping in NCM exhibits enhanced electrochemical characteristics with an excellent discharge capacity, 225.8 mAh/g (0.1C), improved rate-capability of 156 mAh/g (5C) with 82.2% retention in capacity (0.5C) over 100 cycles within 2.7-4.3V as compared to all other prepared electrodes. Hence, the optimal doping of Te is favorable for enhancing capacity, cyclability along with rate capability of NCM.
锂镍钴锰氧化物（NCM）层状氧化物被认为是商业化锂离子电池的理想正极材料。尽管如此，这些材料的成功商业应用受到结构退化和循环性能差等技术问题的阻碍。元素掺杂是提高电化学性能最可行的策略之一。在此，通过高温固态路线制备表面掺杂碲的NCM。由于过渡金属-氧层板的结合使表面氧失活，碲离子的表面掺杂导致结构稳定性。值得注意的是，与所有其他制备的电极相比，NCM中1 wt%的碲掺杂表现出增强的电化学特性，具有出色的放电容量，225.8 mAh/g（0.1C），在2.7-4.3V范围内100次循环中，倍率性能提高到156 mAh/g（5C），容量保持率为82.2%（0.5C）。因此，碲的最佳掺杂有利于提高NCM的容量、循环性能和倍率性能。
