Na-ion batteries are standing as a serious contender to the Li-ion technology for mass storage applications provided we fully master their chemistry, among which the electrolyte is of paramount importance. It controls the degree of parasitic reaction that results in the growth of the solid electrolyte interface (SEI) which governs the battery performances in terms of capacity retention, lifetime, etc... Herein, we show how cyclic voltammetry (CV) can be used to rapidly spot hints of electrolyte decomposition and determine whether the resulting species are either solubilized or adsorbed leading to the SEI formation. Using this approach, we identified a new electrolyte, which consists of a solution of 1M NaPF6 in EC-DMC (1:1 v/v ratio) to which we added three additives namely vinylene carbonate (VC), sodium (oxalate) difluoro borate (NaODFB) and tris (trimethylsilyl) phosphite TMSPi. This novel electrolyte when implemented in today's practical full Na3V2(PO4)2F3/C Na-ion cells gives the best high temperature performances in terms of cyclability and self-discharge. Using CV we could rationalize this finding and unambiguously prove that NaODFB is ruling the SEI formation while TMSPi is essential to control its growth and for capturing both O2 and acid impurities responsible for deleterious reactions occurring at relatively high potentials.

10.1149/2.0721915jes

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Citations (42)

Improving the interfacial stability of ultrahigh-nickel cathodes with PEO-based electrolytes by targeted chemical reactions

Chemical Science (2024)

Yuqing Dai Zihan Hou Gui Luo Duo Deng Wenjie Peng

A PEO-based solid-state lithium metal battery is achieved using an x Li 2 O-B 2 O 3 coating layer with different crystal structures. Besides, a three-electrode cell is fabricated to confirm that the ultrahigh-nickel cathode/PEO interface is stabilized.

Lithium metal

Chemical Stability

10.1039/d4sc02809k

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Citations (2)

Non-aqueous dual-carbon lithium-ion capacitors: a review

Journal of Materials Chemistry A (2019)

Guangchao Li Zhewei Yang Zhoulan Yin Huajun Guo Zhixing Wang

Lithium-ion capacitors have attracted tremendous attention among various electrochemical energy storage systems, benefitting from the merits of high energy density, high power output, long cycle life and favorable chemical stability.

Energy density

Carbon fibers

Power density

10.1039/c9ta01246j

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Citations (132)

Novel LiV(PO₄)_0.9F_1.3 with ultrahigh rate capability and prolonged cycle life

Chemical Communications (2019)

Meichen Zhang Yongmao Zhou Xiaobo Ding Guochun Yan Zhixing Wang

Novel triclinic LiV(PO4)0.9F1.3, characterized through its crystal lattice expansion, ultrafine primary particle size and uniform carbon coating, was designed and fabricated through regulating the PO4/F ratio. It exhibited excellent electrochemical performance, maintaining 105 mA h g-1 at 50C and 92.9% capacity retention after 500 cycles at 10C due to its superior structural stability, greater charge transfer properties, enhanced electronic conductivity and fast Li+ diffusion kinetics.

10.1039/c9cc05190b

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Citations (8)

Enhanced electrochemical performance of PEO/Li6.4Ga0.2La3Zr2O12 composite polymer electrolytes

Ionics (2024)

Bing Guo Qiuyue Wang Zhixing Wang Wu Meng Jiexi Wang

Polymer Electrolytes

10.1007/s11581-024-05589-z

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Citations (2)