全气候长寿命钠离子电池用多孔Na4Fe3(PO4)2-(P2O7)/C复合材料
Na4Fe3(PO4)2(P2O7)/C composite with porous structure enabling all-climate and long-life sodium-ion batteries
石小燕 1郝志强 1朱文庆 1周洵竹 1陈小敏 1王晨晨 2李林 3A.Robert Armstrong 2侴术雷1
作者信息
- 1. Institute for Carbon Neutralization Technology,College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,China;Wenzhou Key Laboratory of Sodium-Ion Batteries,Wenzhou University Technology Innovation Institute for Carbon Neutralization,Wenzhou 325035,China
- 2. School of Chemistry,University of St Andrews,North Haugh,KY16 9ST,St Andrews,UK
- 3. Institute for Carbon Neutralization Technology,College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,China;Wenzhou Key Laboratory of Sodium-Ion Batteries,Wenzhou University Technology Innovation Institute for Carbon Neutralization,Wenzhou 325035,China;State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China
- 折叠
摘要
Na4Fe3(PO4)2(P2O7)(NFPP)具有成本低、晶体结构稳定等优点被认为是极具潜力钠离子电池正极材料.然而,其低的本征电导率,致使电化学性能较差.在本工作中,我们采用简便的自组装策略合成了具有多孔结构的NFPP/C复合材料(p-NFPP).其发达的孔隙结构可在充放电过程中有效减少离子扩散路径,加速电解液浸润,,并适应体积膨胀.此外,原位X射线衍射表明p-NFPP具有优异的结构稳定性.因此,p-NFPP展现出高的可逆容量(104.8 mAh g-1)、良好的倍率性能(10 A g-1时为75.0 mAh g-1)和出色的循环稳定性(2000次循环后仍能保持85.1 mAh g-1的可逆容量).更重要的是,p-NFPP可在55至-10℃的宽温度范围内稳定工作.这项工作证明形态工程是提高电极材料全气候钠存储性能的有力策略.
Abstract
Na4Fe3(PO4)2(P2O7)(NFPP)with the ad-vantages of low cost and stable crystal structure has been considered a highly promising cathode candidate for sodium-ion batteries.However,limited by its undesirable intrinsic conductivity,it still suffers from unsatisfactory electro-chemical performance.Herein,we synthesized NFPP/C com-posites with porous structure(p-NFPP)by a facile self-assembly strategy.Its well-developed pore structure can ef-fectively reduce the ion diffusion path,accelerate electrolyte infiltration and accommodate volume expansion during the charge/discharge process.In addition,in-situ X-ray diffraction revealed the superior structural stability of p-NFPP.They enable a high reversible capacity(104.8 mAh g-1),and good rate performance(75.0 mAh g-1 at 10 A g-1),and excellent cycling stability(a reversible capacity of 85.1 mAh g-1 after 2000 cycles).More importantly,the p-NFPP realizes a stable operation in a wide temperature range of 55℃ to-10℃.This work highlights morphology engineering as a powerful strat-egy to boost the all-climate sodium storage performance of electrode materials.
关键词
sodium-ion batteries/cathode materials/porous structure/all-climates/electrochemical performanceKey words
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出版年
2024
NETL
NSTL
万方数据