期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 9, 页码 8646-8657出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c01235
关键词
Li-ion batteries; high-voltage cathode material; X-ray and neutron diffraction; chromium doping; electrochemical performance; Li-rich cathode material; long-term cycling; half-cell
资金
- BASF SE
Li-rich nickel cobalt manganese oxide materials with Cr doping were designed in order to improve the cycling stability of Li-rich cathode materials. Several samples with the chemical formula Li-1.171 (Ni0.191Co0.099Mn0.539)O-2, Li1.148Cr0.008 (Ni0.191CO0.0 99Mn0.539 )O-2, Li1.112Cr0.019 (Ni0.191Co0.099Mn0.539)O-2 and Li1.171Cr0.039(Ni0.191Co0.099Mn0.539)O-2 labeled, respectively, HE-NCM, Li100-3xCrx-NCM (x = 0.67 and 1.67), and Li100Cr3.33-NCM were synthesized by the Pechini method. The materials were characterized by X-ray and neutron diffraction as well as with scanning electron microscopy (SEM). The Li100Cr3.33-NCM material displays the best mitigation of the potential drop after 100 cycles. After 100 cycles, Li-98 Cr-0.67-NCM, Li95Cr3.33-NCM, and Li100Cr3.33-NCM deliver a stable specific charge higher than 200 mA h/g with high-loaded electrodes. While the Li100-3xCr-NCM samples still display a significant fading of their average discharge potential, the average discharge potential of Li100Cr3.33-NCM material is better stabilized at a value offering a specific energy superior to 700 W h/kg, thus confirming the advantages of Cr doping.
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