JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 33
·1-12
·
IF 2.8
Munusami V.,Arutselvan K.,Vadivel S.,Govindasamy S.
Because of the plentiful supply of sodium, sodium ion batteries (SIBs) as one of the most promising technologies for affordable rechargeable batteries. Here, we outline an easy method for creating a NaFePO 4 @C hybrid composite cathode for SIBs. GCD, CV, and EIS tests have been conducted to study the samples’ electrochemical and kinematic properties. It is confirmed that modest carbon doping can enhance the electrocatalytic activity of NaFePO 4 (NFP). The resulting NFP@C nanocomposite as cathode material for SIBs displays good rate capability and lofty capacity (158.5 mAhg −1 ) retention after 50 cycles at 0.1C. The NaFePO 4 and the carbon covering, which make it easier for the Na + ion and electron to access the material quickly during the process of charging and discharging, respectively, are responsible for the good electrochemical performances. This work highlights the value of investigating novel structures and offers a technique for the creation of NaFePO 4 @C-based cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Fangyu Xiong,Qinyou An,Lixue Xia,Yan Zhao,Liqiang Mai,Haizheng Tao,Yuanzheng Yue
Among the various types of cathode materials for sodium ion batteries , NaFePO 4 attracts much attention owing to its high theoretical capacity (155 mA h g −1 ), low cost, high structural stability, and non-toxicity. Nevertheless, the NaFePO 4 with maricite structure, thermodynamically stable phase, has been considered as electrochemically inactive for sodium-ion storage. In this work, we succeeded in tuning the degree of disorder in NaFePO 4 cathode material by a mechanochemical route to enhance electrochemical performances of Na-ion batteries. The derived NaFePO 4 cathodes containing both amorphous and maricite phases exhibit much improved sodium storage performance with an initial capacity of 115 mA h g −1 at 1 C and an excellent cycling stability of capacity retention of 91.3% after 800 cycles. By X-ray absorption near edge and Raman spectroscopy , we revealed the atom-scale structural origin of the enhanced Na-storage performances of the amorphous NaFePO 4 electrode. The transformation of edge-sharing FeO 6 octahedra into various FeO n polyhedra upon amorphization was found to be a key to attain the superior performances for Na ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 32
·2401489
·
IF 13
Tongtong Gan,Jiashu Yuan,Fang Chen,Guodong Zhang,Laihao Liu,Li Zhou,Yunfang Gao,Yonggao Xia
To mitigate the environmental impact of the improper disposal of spent LiFePO 4 batteries and reduce resource waste, the development of LiFePO 4 recycling technologies is of paramount importance. Meanwhile, olivine-structured NaFePO 4 in sodium-ion batteries has received great attention, due to its high theoretical specific capacity of 154 mAh g −1 and excellent stability. However, olivine NaFePO 4 only can be synthesized from olivine LiFePO 4 . Accordingly, in this proposal, developing the continuous flow electrochemical solid-liquid reactor-based metal ion insertion technology is to utilize the olivine FePO 4 , recycled from LiFePO 4 , and to synthesize NaFePO 4 . Additionally, by employing I − as the reducing agent, NaFePO 4 is successfully synthesized with a discharge-specific capacity of 134 mAh g −1 at 0.1C and a remarkable capacity retention rate of 86.5% after 100 cycles at 0.2C. And the reasons for sodium deficiency in the synthesized NFP are elucidated through first-principles calculations. Furthermore, the kinetics of the solid-solution reaction 2 (Na 2/3+β PO 4 → Na 1-α FePO 4 ) mechanism improve with cycling and are sensitive to temperature. Utilizing a minimal amount of reducing agent in the electrochemical reactor, NaFePO 4 synthesis is successfully achieved. This innovative approach offers a new, cost-effective, and environmentally friendly strategy for preparing NaFePO 4 from recycling LiFePO 4 .
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2024
·
IF 16.8
Shunjie Xu,Jiashu Yuan,Denghui Ma,Liling Dai,Tongtong Gan,Xiaosong Zhang,Xinliao Peng,Xiuxia Zuo,Jie Gao,Yonggao Xia
sodium ion batteries are considered as excellent energy storage battery materials with the characteristic of low cost and renewability. As a critical component of sodium-ion energy storage batteries, cathode materials have attracted great attention from scientists around the world. Recently, Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 (NFPP) which offer a theoretical capacity of 129 mAh g −1 has garnered widespread attention. However, the formation of inactive maricite NaFePO 4 (NFP) and low capacity Na 2 FeP 2 O 7 (Na 2 FPO) during the synthesis process restricts the capacity utilization, while poor conductivity further limits its electrochemical performance. To address these issues, here, Na 3.95 Fe 2.95 V 0.05 (PO 4 ) 2 P 2 O 7 /C (V 0.05 -NFPP/C) composite material was synthesized and assembled into cell for testing. A capacity of 114 mAh g −1 was given at 0.1 C and rate performance also represent 90 mAh g −1 at 10 C. Vanadium-ion improves the dynamic performance by inhibiting maricite NFP and participating in electrochemical reactions. Furthermore, sodium-ion storage mechanism of V 0.05 -NFPP/C was revealed by ex-situ XRD patterns with the assistance of first-principles calculations, and the phase transformation mechanism during the sintering process was explored.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 30
·1801917
·
IF 13.325
Yongchang Liu,Ning Zhang,Fanfan Wang,Xiaobin Liu,Lifang Jiao,Li-Zhen Fan
Maricite NaFePO 4 nanodots with minimized sizes (≈1.6 nm) uniformly embedded in porous N-doped carbon nanofibers (designated as NaFePO 4 @C) are first prepared by electrospinning for maximized Na-storage performance. The obtained flexible NaFePO 4 @C fiber membrane adherent on aluminum foil is directly used as binder-free cathode for sodium-ion batteries, revealing that the ultrasmall nanosize effect as well as a high-potential desodiation process can transform the generally perceived electrochemically inactive maricite NaFePO 4 into a highly active amorphous phase; meanwhile, remarkable electrochemical performance in terms of high reversible capacity (145 mA h g −1 at 0.2 C), high rate capability (61 mA h g −1 at 50 C), and unprecedentedly high cyclic stability (≈89% capacity retention over 6300 cycles) is achieved. Furthermore, the soft package Na-ion full battery constructed by the NaFePO 4 @C nanofibers cathode and the pure carbon nanofibers anode displays a promising energy density of 168.1 Wh kg −1 and a notable capacity retention of 87% after 200 cycles. The distinctive 3D network structure of very fine NaFePO 4 nanoparticles homogeneously encapsulated in interconnected porous N-doped carbon nanofibers, can effectively improve the active materials' utilization rate, facilitate the electrons/Na + ions transport, and strengthen the electrode stability upon prolonged cycling, leading to the fascinating Na-storage performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）