A comprehensive study on influence of Nd3+ substitution on properties of LiMn2O4

Bulletin of materials science

S Balaji¹  T Manichandran¹  D Mutharasu² 

[1] Department of Chemistry, Thiagarajar College of Engineering, Madurai 625 015, India$$Department of Chemistry, Thiagarajar College of Engineering, Madurai 625 015, IndiaDepartment of Chemistry, Thiagarajar College of Engineering, Madurai 625 015, India$$;School of Physics, Universiti Sains Malaysia, Penang 11030, Malaysia$$School of Physics, Universiti Sains Malaysia, Penang 11030, MalaysiaSchool of Physics, Universiti Sains Malaysia, Penang 11030, Malaysia$$

关键词: Co-precipitation;    rare earth doping;    Ozawa method;    lithiation;    cycle life.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

LiNd_ð‘�?Mn_{2−ð�?��?}O₄ samples are synthesized via co-precipitation technique. The activation energies computed from thermogravimetric analyses on the basis of Ozawa method have been observed to linearly increase with increase in dopant concentration. X-ray diffraction analyses indicate the cubicâ€�?�spinel structure for all the samples. The lattice parameter has been observed to decrease with increasing concentration of Nd³⁺ doping. The octahedral site preference of neodymium dopant in the LiMn₂O₄ structure has been elucidated using XRD and FTâ€�?�IR studies. The porosity and surface roughness obtained from SEM analysis have been observed to decrease with increase in Nd³⁺ dopant concentration in LiMn₂O₄ lattice. The electrochemical performances of the electrodes were analysed through cyclic voltammetry, chronopotentiometry and electrochemical impedance techniques. The specific capacity has been observed to decrease initially with increase in Nd³⁺ dopant concentration, whereas the capacity retention has increased with increase in dopant concentration. The observed percentage capacity retention after 50 cycles of the electrodes LiNd_0.05Mn_1.95O₄, LiNd_0.10Mn_1.90O₄ and LiNd_0.15Mn_1.85O₄ were 88.4%, 97.1% and 96.8%, respectively. The Li ion diffusion coefficient ascertained using electrochemical impedance spectroscopy was found to be higher for LiNd_0.10Mn_1.90O₄ around 3.74 Ã�? 10^-12 cm² s^-1.

【 授权许可】

Unknown