TY - JOUR
T1 - Boosting the sodium storage performance of Prussian blue analogs by single-crystal and high-entropy approach
AU - Huang, Yao
AU - Zhang, Xuan
AU - Ji, Lei
AU - Wang, Li
AU - Xu, Ben Bin
AU - Shahzad, Muhammad Wakil
AU - Tang, Yuxin
AU - Zhu, Yaofeng
AU - Yan, Mi
AU - Sun, Guoxing
AU - Jiang, Yinzhu
N1 - Funding information:
This work was supported by the National Key R&D Program (2019YFE0111200), Zhejiang Provincial Natural Science Foundation of China (LZ23B030003), National Natural Science Foundation of China (22005250), the Fundamental Research Funds for the Central Universities (2021FZZX001-09), and the Science and Technology Projects of China Northern Rare Earth (Group) High-tech Co., Ltd. (BFXT-2022-D-0018).
PY - 2023/3/11
Y1 - 2023/3/11
N2 - Prussian blue analogs (PBAs) are widely considered to be one of the most promising types of cathode materials for sodium ion batteries. However, unsatisfactory structural stability upon excessive sodium storage and long-term cycling is still a bottleneck in industrial applications. Herein, a two-pronged approach of single-crystal and high-entropy PBA (SC-HEPBA), is first reported to solve this challenge simultaneously from the bulk phase and interface. The nature of high entropy enables the unrestricted Na+ diffusion and the suppressed metal dissolution, while the micrometer-sized single crystals help to improve the tap density with less structural degradation upon cycling. As a result, the Na-rich SC-HEPBA with an intact monoclinic crystal structure delivers a high capacity of 115 mAh g-1 at 100 mA g-1, outstanding rate performance (i.e. 74.4 mAh g-1 at 3000 mA g-1) and good capacity retention (79.6%) over 1000 cycles with a stable operating voltage of 3.25 V. The SC-HEPBA/NaTi2(PO4)3 full cell achieves 109.4 mAh g-1 and a stable cyclability over 2000 cycles with 77.8 % capacity maintained. The proposed two-pronged approach not only paved the way for the practical application of PBAs in SIBs but also provided guidance on inhibiting the structure evolution of battery materials during cycling.
AB - Prussian blue analogs (PBAs) are widely considered to be one of the most promising types of cathode materials for sodium ion batteries. However, unsatisfactory structural stability upon excessive sodium storage and long-term cycling is still a bottleneck in industrial applications. Herein, a two-pronged approach of single-crystal and high-entropy PBA (SC-HEPBA), is first reported to solve this challenge simultaneously from the bulk phase and interface. The nature of high entropy enables the unrestricted Na+ diffusion and the suppressed metal dissolution, while the micrometer-sized single crystals help to improve the tap density with less structural degradation upon cycling. As a result, the Na-rich SC-HEPBA with an intact monoclinic crystal structure delivers a high capacity of 115 mAh g-1 at 100 mA g-1, outstanding rate performance (i.e. 74.4 mAh g-1 at 3000 mA g-1) and good capacity retention (79.6%) over 1000 cycles with a stable operating voltage of 3.25 V. The SC-HEPBA/NaTi2(PO4)3 full cell achieves 109.4 mAh g-1 and a stable cyclability over 2000 cycles with 77.8 % capacity maintained. The proposed two-pronged approach not only paved the way for the practical application of PBAs in SIBs but also provided guidance on inhibiting the structure evolution of battery materials during cycling.
KW - Prussian blue analogues
KW - sodium-ion battery
KW - high-entropy material
KW - single crystal
U2 - 10.1016/j.ensm.2023.03.011
DO - 10.1016/j.ensm.2023.03.011
M3 - Article
JO - Energy Storage Materials
JF - Energy Storage Materials
SN - 2405-8297
ER -