Triple Salts Electrolyte for High Cyclability and High Capability in Practical Safe Nickel-Rich Batteries

IF 16.8 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy Pub Date : 2024-10-10 DOI:10.1016/j.nanoen.2024.110357

Xuning Feng, Yingchen Xie, Qiang Wu, Zhihao Liu, Liyuan Zheng, Yu Wu, Dongsheng Ren, Chengshan Xu, Xuebing Han, Languang Lu, Chunyan Luo, Li Wang, Minggao Ouyang, Xiangming He

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Abstract

The pursuit of extended driving ranges of electric vehicles has spurred the use of nickel-rich layered cathodes, yet raised safety concerns. Existing ethylene carbonate-free electrolytes improve safety but compromise electrochemical performances due to the delicate balance between anode interphases. We introduce a novel electrolyte composed of propylene carbonate (PC) and triple lithium salts, which synergistically reinforces both cathode and anode interfaces. PC's low kinetic reactivity with LiNi_0.8Mn_0.1Co_0.1O₂ (NCM811) at the cathode minimizes heat generation and oxygen evolution. To stabilize the anode, bis(fluorosulfonyl)imide (FSI^-) anions are integrated to construct an anion-driven interface, while difluoro(oxalato)borate (DFOB^-) is added to lower PC's de-solvation energy and prevent co-intercalation. NCM811/Graphite pouch cells utilizing this electrolyte show enhanced safety, cyclability, and rate capability, surviving 60 minutes at 180℃ without incident. Post-mortem analysis reveals suppressed parasitic reactions and the formation of a robust solid electrolyte interphase (SEI). This research offers a critical framework for the design of electrolytes tailored for high-energy lithium-ion batteries.

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三盐电解质实现实用安全富镍电池的高循环性和高容量

电动汽车对延长行驶里程的追求推动了富镍层状阴极的使用，但同时也引发了安全问题。现有的不含碳酸乙烯酯的电解质虽然提高了安全性，但由于阳极相间的微妙平衡而影响了电化学性能。我们介绍了一种由碳酸丙烯酯（PC）和三重锂盐组成的新型电解质，它能协同强化阴极和阳极界面。在阴极，PC 与 LiNi0.8Mn0.1Co0.1O2 (NCM811) 的低动力学反应性最大程度地减少了发热和氧的演化。为稳定阳极，加入了双（氟磺酰）亚胺（FSI-）阴离子以构建阴离子驱动界面，同时加入二氟（草酸）硼酸盐（DFOB-）以降低 PC 的脱溶能并防止共闰化。使用这种电解质的 NCM811/Graphite 袋状电池显示出更高的安全性、循环性和速率能力，在 180℃ 下可存活 60 分钟而不会发生任何事故。死后分析表明，寄生反应受到抑制，并形成了坚固的固体电解质相（SEI）。这项研究为高能锂离子电池电解质的设计提供了一个关键框架。

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来源期刊

Nano Energy CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

30.30

自引率

7.40%

发文量

1207

审稿时长

23 days

期刊介绍： Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem. Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.