کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7962393 | 1513986 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Superior Na-ion storage achieved by Ti substitution in Na3V2(PO4)3
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
فناوری سوخت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The development of sodium-ion batteries (SIBs) remains a great challenge due to poor stability and sluggish kinetics of cathode materials. Here, we present Ti-substituted Na3-xV2-xTix(PO4)3/C (NVP-Tix/Cï¼0 ⤠x ⤠0.2) as high-performance cathode materials for SIBs. Crystal structure and Na storage properties are investigated by experiment and theoretical calculation. X-ray diffraction results reveal that NVP-Tix have same rhombohedral structure as NVP but shrunk lattice parameters. Pair distribution function spectra and the calculated crystal structure suggest that the local structural distortion of the doped samples originates from slight decrease of VâO bond. As SIB cathode materials, greatly enhanced structural stability and electrochemical performance are achieved by Ti substitution. Especially, NVP-Ti0.15/C exhibits excellent rate capability and cyclability with capacity retention of 60% after 2000 cycles at high rate of 10â¯C. Importantly, even at 20â¯C, a reversible capacity of 63 mAh gâ1 is maintained after 300 cycles at elevated temperature of 60â¯Â°C. Density functional theory calculations demonstrate that the superior electrochemical performance of the Ti-doped samples can be attributed to the enhanced intrinsic electronic conductivity, low Na+ diffusion energy barrier and high structural stability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Storage Materials - Volume 15, November 2018, Pages 108-115
Journal: Energy Storage Materials - Volume 15, November 2018, Pages 108-115
نویسندگان
Yangyang Huang, Xiang Li, Jinsong Wang, Lin Miao, Chang Li, Jiantao Han, Yunhui Huang,