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Coating a Na3V2(PO4)3 cathode material with carbon to improve its sodium storage

CHEN Yan-jun CHENG Jun SUN Shi-qi WANG Yan-zhong GUO Li

陈彦俊, 程军, 孙式琦, 王延忠, 郭丽. 不同碳源对Na3V2(PO4)3正极材料储钠性能的影响[J]. 新型炭材料, 2021, 36(6): 1118-1127. doi: 10.1016/S1872-5805(21)60098-7
引用本文: 陈彦俊, 程军, 孙式琦, 王延忠, 郭丽. 不同碳源对Na3V2(PO4)3正极材料储钠性能的影响[J]. 新型炭材料, 2021, 36(6): 1118-1127. doi: 10.1016/S1872-5805(21)60098-7
CHEN Yan-jun, CHENG Jun, SUN Shi-qi, WANG Yan-zhong, GUO Li. Coating a Na3V2(PO4)3 cathode material with carbon to improve its sodium storage[J]. NEW CARBON MATERIALS, 2021, 36(6): 1118-1127. doi: 10.1016/S1872-5805(21)60098-7
Citation: CHEN Yan-jun, CHENG Jun, SUN Shi-qi, WANG Yan-zhong, GUO Li. Coating a Na3V2(PO4)3 cathode material with carbon to improve its sodium storage[J]. NEW CARBON MATERIALS, 2021, 36(6): 1118-1127. doi: 10.1016/S1872-5805(21)60098-7

不同碳源对Na3V2(PO4)3正极材料储钠性能的影响

doi: 10.1016/S1872-5805(21)60098-7
基金项目: 山西省高等学校科技创新项目(2019L0538),山西省科技重大专项(20181102018),山西省高等学校中青年拔尖创新人才支持计划,中北大学自然科学基金(XJJ201821)
详细信息
    通讯作者:

    陈彦俊,讲师. E-mail:yjchen@nuc.edu.cn

  • 中图分类号: TB33

Coating a Na3V2(PO4)3 cathode material with carbon to improve its sodium storage

More Information
  • 摘要: 具有独特三维框架结构的钠超离子导体型磷酸钒钠是非常具有前景的钠电正极材料。在本工作中,两种碳源被选择作为原材料,通过溶胶凝胶法制备了碳包覆的磷酸钒钠。深入研究了不同炭材料对晶体结构、形貌特征、动力学特性以及电化学储钠特性的影响。结果表明柠檬酸作为碳源制备得到的磷酸钒钠,具有更大的晶胞体积和更小的粒子尺寸,导致了拓宽的离子迁移通道和缩短的离子迁移路径,进而提高动力学特性。该材料表现出优异的电化学特性,在0.1 C下可以释放112.3 mAh g−1的容量。在1 C 循环200圈下容量保持率接近100%。由于快速的粒子导电特性,在2 C和5 C的大倍率循环下,该材料可以释放90.0和89.1 mAh g−1的初始容量,循环200圈后保持率分别为92.7%和90%。因此,这种改性的磷酸钒钠电极材料可以作为优异的正极材料应用在钠电池领域。
  • FIG. 1079.  FIG. 1079.

    FIG. 1079.. 

    Figure  1.  Schematic of synthesis for NVP/C materials via sol-gel method.

    Figure  2.  Refined XRD patterns of (a) C-NVP/C and (b) O-NVP/C.

    Figure  3.  SEM images of (a,b,c) C-NVP/C and (d,e,f) O-NVP/C samples; (g) EDX mapping image of C-NVP/C composite .

    Figure  4.  TEM images of (a) C-NVP/C and (b) O-NVP/C.

    Figure  5.  (a) TEM image and (b) HRTEM image of C-NVP/C sample (insert graph is FFT result).

    Figure  6.  (a) TEM image and (b) HRTEM image of O-NVP/C (insert graph is FFT result).

    Figure  7.  Raman spectra of (a) C-NVP/C and (b) O-NVP/C.

    Figure  8.  XPS survey spectra of (a) C-NVP/C and (b) O-NVP/C ; Core levels of Na1s for (c) C-NVP/C and (d) O-NVP/C; Core levels of V2p for (e) C-NVP/C and (f) O-NVP/C.

    Figure  9.  (a) CV curves of both samples at 0.1 mV s−1; CV curves of (b) O-NVP/C and (d) C-NVP/C at different scan rate from 0.1 to 5 mV s−1; Relationship between Ip and v1/2 of (c) O-NVP/C and (e) C-NVP/C.

    Figure  10.  (a) Nyquist plots of C-NVP/C and O-NVP/C measured at a charge state (insert: equivalent circuit model); (b) Relationship between Z’ and ω−0.5 in the low-frequency region.

    Figure  11.  (a) First cycle at 0.1 C for C-NVP/C and O-NVP/C cathodes. (b) Rate capability of both electrodes from 0.1 to 10 C. Cycling performance of both samples at (c) 2 C and (d) 5 C.

    Table  1.   Refined cell parameters for C-NVP/C and O-NVP/C.

    Samplea=b (nm)c (nm)Volume (nm3)
    C-NVP/C0.87162.1821.43538
    O-NVP/C0.87032.1771.42802
    下载: 导出CSV

    Table  2.   Apparent diffusion coefficients of Na+ of both electrodes.

    SampleSlope DNa+ /cm2 s−1
    ChargeDischarge ChargeDischarge
    C-NVP/C 0.0382 −0.0388 5.20×10−11 5.36×10−11
    O-NVP/C 0.0271 −0.0123 2.61×10−11 5.39×10−12
    下载: 导出CSV

    Table  3.   Fitted Rct, σ, DNa+ values for C-NVP/C and O-NVP/C electrodes.

    SampleRct(Ω)σDNa+(cm2 s−1)
    C-NVP/C273.511.113.69×10−13
    O-NVP/C330.239.262.96×10−14
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-06-06
  • 修回日期:  2021-07-28
  • 网络出版日期:  2021-11-19
  • 刊出日期:  2021-12-01

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