A novel Cu+-doped Li[Fe0.9Cu0.1Li0.1]PO4/C cathode material with enhanced electrochemical properties

作者：Zhu, Jian-Min; Xia, Tian; Yan, Kang-Kang; Chang, Wei-Jui; Chen, Xue-Gang; Ye, Ying; Zhang, Ping-Ping^*

来源：RSC Advances, 2017, 7(28): 16984-16990.

DOI：10.1039/c6ra28827h

• LITHIUM-ION BATTERIES
• LIFEPO4 NANOPARTICLES
• CU-ZSM-5 CATALYSTS
• PHASE-SEPARATION
• PERFORMANCE
• REDUCTION
• LI
• SUPPRESSION
• OXIDATION
• DISCHARGE

LiFePO4 is an effective battery material which has gained global focus. In this study, we prepared a novel Cu+-doped Li[Fe0.9Cu0.1Li0.1] PO4/C cathode material via a carbothermal reduction method using glucose as carbon source. X-ray diffraction (XRD) patterns and Rietveld refinement on the samples are consistent with the orthorhombic phase and showed that the substituting Cu+ ions and excess Li+ ions occupy the Fe sites. The micro-morphology of the samples indicates that Cu+ doping can decrease the particle size and maintain the crystal structure of LiFePO4/C. XP spectra confirmed that the surface oxidation states of Fe and Cu are +2 and +1, respectively. The as-prepared Li[Fe0.9Cu0.1Li0.1] PO4/C composite exhibits enhanced initial discharge capacity (148.8 mA h g(-1)) compared to the un-doped LiFePO4/C. The discharge capacity remains at 149.8 mA h g(-1) after 50 cycles at a rate of 0.2C, which displayed an excellent cycling stability. Furthermore, the cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) results showed that the Cu+-doped LiFePO4/C composite exhibits a higher lithium-ion diffusion coefficient and lower charge transfer resistance than the undoped counterparts. This study presents a novel Cu+-doped LiFePO4/C cathode material with enhanced electrochemical properties, which could be potentially applied as a battery material.

• 出版日期2017
• 单位浙江大学