Enhanced electrode kinetics and properties via anionic regulation in polyanionic Na3+xV2(PO4)3−x(P2O7)x cathode material
Enhanced electrode kinetics and properties via anionic regulation in polyanionic Na3+xV2(PO4)3−x(P2O7)x cathode material
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通过聚阴离子 Na3 xV2(PO4)3âx(P2O7)x 阴极材料的阴离子调节增强电极动力学和性能
DOI：
10.1016/j.gee.2020.11.026
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发表时间：
2020-11
影响因子：
13.3
通讯作者：
Xing-Long Wu
中科院分区：
文献类型：
--
作者：
Mei-Yi Wang;Xin-Xin Zhao;Jin-Zhi Guo;Xue-Jiao Nie;Zhen-Yi Gu;Xu Yang;Xing-Long Wu
混合聚阴离子正极材料具有结构健壮、体积变化小等优点，是发展下一代电池的理想材料，但聚阴离子的低导电性阻碍了其实际容量的提高。在此，提出了阴离子位置调节来提高聚阴离子阴极的电极动力学和性能。选择多价阴离子P2O74−取代Na_3V_2(PO_4)_3(NVP)晶格中的PO_43−，并调节多阴离子基团的比例，制备了Na_3+xV_2(PO_4)_3·−_x(P_2O_7)x(NVPPx，0~≤_x·≤_(0.15))材料。优化的Na3.1V_2(PO_4)_2·9(P_2O_7)_(0.1)(NVPP0.1)材料比容量显著提高(0.1℃时比容量为104mAhg−_1，20℃时比容量为60mAhg−_1)。此外，NVPP0.1具有优异的循环稳定性(1℃下300次循环后容量保持率为91%)。实验分析表明，阴离子的调节提高了结构的稳定性，增加了活性Na在晶格中的占有率，加速了Na+的迁移动力学。阴离子位调控策略为研究人员设计新型高性能聚阴离子材料提供了参考。
Mixing polyanion cathode materials are promising candidates for the development of next-generation batteries, owing to their structural robustness and low-volume changes, yet low conductivity of polyanion hinders their practical capacity. Herein, the anion-site regulation is proposed to elevate the electrode kinetics and properties of polyanionic cathode. Multivalent anion P2O74−is selected to substitute the PO43−in Na3V2(PO4)3(NVP) lattice and regulate the ratio of polyanion groups to prepare Na3+xV2(PO4)3−x(P2O7)x(NVPPx, 0 ≤ x ≤ 0.15) materials. The optimal Na3.1V2(PO4)2.9(P2O7)0.1(NVPP0.1) material can deliver remarkably elevated specific capacity (104 mAh g−1at 0.1 C, 60 mAh g−1at 20 C, respectively), which is higher than those of NVP. Moreover, NVPP0.1exhibits outstanding cyclic stability (91% capacity retention after 300 cycles at 1 C). Experimental analyses reveal that the regulation of anions improves the structure stability, increases the active Na occupancy in the lattice and accelerates the Na+migration kinetics. The strategy of anion-site regulation provides the researchers a reference for the design of new high-performance polyanionic materials.
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影响因子：
9.2
作者：
H. Moriwake;A. Kuwabara;C. Fisher;M. Nose;H. Nakayama;Shinji Nakanishi;H. Iba;Y. Ikuhara
通讯作者：
H. Moriwake;A. Kuwabara;C. Fisher;M. Nose;H. Nakayama;Shinji Nakanishi;H. Iba;Y. Ikuhara
影响因子：
6.6
作者：
Kosova, Nina V.;Belotserkovsky, Valery A.
通讯作者：
Belotserkovsky, Valery A.
DOI：
10.1021/jp020287h
发表时间：
2002-06
期刊：
--
影响因子：
--
作者：
P. P. Kumar-P.;S. Yashonath
通讯作者：
P. P. Kumar-P.;S. Yashonath
影响因子：
3.1
作者：
Laiqiang Xu;Jiayang Li;Yitong Li;Peng Cai;Cheng Liu;Guoqiang Zou;Hongshuai Hou;Lan Huang;Xiaobo Ji
通讯作者：
Laiqiang Xu;Jiayang Li;Yitong Li;Peng Cai;Cheng Liu;Guoqiang Zou;Hongshuai Hou;Lan Huang;Xiaobo Ji
由高压正极和商用石墨负极组装而成的实用锂/钠离子混合全电池：优越的储能性能和工作机制
影响因子：
27.8
作者：
Guo, Jin-Zhi;Yang, Yang;Su, Zhong-Min
通讯作者：
Su, Zhong-Min