Sodium-Difluoro(oxalato)Borate-Based Electrolytes for Long-Term Cycle Life and Enhanced Low-Temperature Sodium-Ion Batteries

IF 24.4 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Miaomiao Xia, Hui Chen, Zhenxu Zheng, Qingfei Meng, Along Zhao, Xiaoyang Chen, Xinping Ai, Yongjin Fang, Yuliang Cao
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Abstract

Sodium-ion batteries (SIBs) are emerging as a promising alternative for next-generation energy storage solutions, driven by the economic and environmental benefits of abundant sodium resources. A pivotal aspect of SIB advancement is the development of advanced electrolytes, which remains a formidable challenge. Herein, a facile and scalable synthesis method for low-cost sodium-difluoro(oxalato)borate (NaDFOB) is reported and explored its application as a standalone electrolyte salt for SIBs. The NaDFOB-based ether electrolyte demonstrates exceptional electrochemical stability, solvent compatibility, and the unique capacity to form a dense, robust solid-electrolyte interphase layer on electrode surfaces. As a result, the Na4Fe3(PO4)2P2O7 (NFPP) cathode with NaDFOB-based electrolyte exhibits ultrahigh cycling stability with a remarkable capacity retention of 98.7% after 1000 cycles. Furthermore, an Ah-level hard carbon (HC)//NFPP pouch cell using NaDFOB-based ether electrolyte shows an impressive cycle life of 500 cycles, coupled with an average Coulombic efficiency of 99.9%. The pouch cells also maintain superior electrochemical performance across a broad temperature range from −40 to 60 °C, showcasing the electrolyte's versatility. This work contributes significant insights into the strategic design and application of innovative salts, paving the way for longer-lasting SIBs with enhanced electrochemical performance.

Abstract Image

基于二氟(草酸)硼酸钠的电解质可实现长期循环寿命并增强低温钠离子电池的性能
在丰富的钠资源所带来的经济和环境效益的推动下,钠离子电池(SIB)正在成为下一代能源存储解决方案的一个前景广阔的替代方案。先进电解质的开发是 SIB 发展的一个关键方面,但这仍然是一项艰巨的挑战。本文报告了一种低成本二氟草酸硼酸钠(NaDFOB)的简便、可扩展的合成方法,并探讨了其作为独立电解质盐在 SIB 中的应用。基于 NaDFOB 的醚电解质具有优异的电化学稳定性、溶剂相容性以及在电极表面形成致密、坚固的固态电解质相间层的独特能力。因此,采用 NaDFOB 电解质的 Na4Fe3(PO4)2P2O7 (NFPP) 阴极具有超高的循环稳定性,1000 次循环后容量保持率高达 98.7%。此外,使用基于 NaDFOB 的醚电解质的 Ah 级硬碳(HC)//NFPP 袋式电池显示出令人印象深刻的 500 次循环寿命,以及 99.9% 的平均库仑效率。这种袋式电池还能在 -40 至 60 °C 的宽温度范围内保持优异的电化学性能,展示了电解液的多功能性。这项工作为创新盐的战略设计和应用提供了重要见解,为实现更持久、电化学性能更强的 SIB 铺平了道路。
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来源期刊
Advanced Energy Materials
Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
41.90
自引率
4.00%
发文量
889
审稿时长
1.4 months
期刊介绍: Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.
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