Thermal Stability of Delithiated Al-Substituted LiNi_(1/3)Co(1/3)MniaO_2 Cathodes

摘要

Li_x(Ni_(1/3)Co_(1/3)Mn_(1/3)O_2 (NCM) and Li_x(Ni_(0.8)Co_(0.15)Al_(0.05)O_2 (NCA) are being explored as replacements to the traditional LiCoC_2 used in Li-ion battery cathodes. The addition of multiple transition metal constituents (Ni, Mn and Al) offers lower toxicity, cost and thermal instability (1-5). The thermal stability of delithiated NCM and NCA is well characterized both in the presence and absence of non-aqueous electrolytes (6-9). Belharouak et al. have shown through dynamic scanning calorimetry (DSC) that NCM has a higher onset temperature and lower heat generation than NCA in the delithiated state giving it better safety properties at a specific capacity greater than LiCoC_2 (7).