Journal
ELECTROCHIMICA ACTA
Volume 462, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2023.142758
Keywords
Nickel-rich NMC; TiO2; Cathode; High voltage; Lithium-ion battery
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LiNi1-x-yMnxCoyO2 (NMC) is considered one of the most promising lithium-ion battery cathode materials due to its high energy density and reasonable costs. However, its widespread use has been limited by its lower structural stability and higher surface reactivity. Wet-chemical titanium-based modifications have been explored to improve the cycling and high-voltage stability of NMC811.
LiNi1-x-yMnxCoyO2 (NMC) with a nickel content of & GE;80% is currently considered one of the most promising lithium-ion battery cathode materials for applications that require both a high energy density and reasonable costs. However, its widespread use has so far been limited by its inherently lower structural stability and higher surface reactivity compared to NMC materials with a lower nickel content. Here, we explore wet-chemical titanium-based bulk and surface modifications to improve the cycling and high-voltage stability of NMC811. We find that both doping and coating with titanium improve cycling stability. For example, the capacity retention of graphite/NMC811 full cells cycled for 200 cycles between 2.8 and 4.4 V at C/3 improves from 86.1% for the pristine NMC811 to 89.4% and 91.5% for the doped and coated samples, respectively. Combining doping and coating in a two-step process results in a material with the most balanced properties in terms of capacity, cycling stability, rate performance, and high-voltage stability.
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