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- Hernández, Guiomar, et al.
(författare)
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Non-Fluorinated Electrolytes for Si-based Li-ion Battery Anodes
- 2018
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Although the performance of lithium-ion batteries has been improved to some extent since the initial commercialization,1 cycling stability, safety and sustainability still present some challenges and concerns. In this regard, the battery electrolyte plays an important role. State-of-the-art electrolytes contain the electrolyte salt LiPF6, susceptible to undergo defluorination reactions and form toxic and corrosive compounds, such as HF. Yet, fluorine-containing electrolytes are often considered necessary for enhanced battery performance. On the other hand, replacing LiPF6 with fluorine-free salts would reduce cost, increase safety and decrease toxicity, both in the manufacturing and recycling processes. Among the available fluorine-free salts, lithium bis(oxalato)borate (LiBOB) is a viable candidate due to its enhanced thermal stability.2 Furthermore, additives in the electrolyte are another common source of fluorine, not least fluoroethylene carbonate (FEC) which can form a stable solid electrolyte interface (SEI).3Herein, we compare the cell performance of fluorinated and non-fluorinated electrolytes in NMC/Si-Graphite full cells. Three electrolytes are tested: (1) LP57 (1 M LiPF6 in ethylene carbonate (EC):ethyl methyl carbonate (EMC) 3:7 vol/vol); (2) LP57 with 10 wt% FEC and 2 wt% vinylene carbonate (VC); and (3) 0.7 M LiBOB in EC:EMC 3:7 vol/vol and 2 wt% VC.The cells containing the conventional electrolyte, LP57, feature a rapid capacity fade and continuous decrease in coulombic efficiency. The cell performance is improved when adding SEI-forming additives to the electrolyte (LP57 with FEC and VC). In addition, stable cycling for over 200 cycles are obtained for both the fluorinated (LP57 with FEC and VC) and non-fluorinated (LiBOB with VC) electrolytes.Characterisation by X-ray photoelectron spectroscopy (XPS) of the anode surface showed higher amounts of carbonate species and a thicker SEI layer with the non-fluorinated electrolyte compared to the fluorinated one.1 J. Electrochem. Soc. 2017, 164, A5019-A5025.2 ChemSusChem 2017, 10, 2431-2448.3 J. Electrochem. Soc. 2014, 161, A1933-A1938.
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- Ma, Le Anh, 1992-, et al.
(författare)
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Oxygen redox activity in Na0.67Ni0.25Mg0.05Mn0.7O2
- 2018
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Ingår i: Abstract for 5th international conference of sodium batteries 2018 in St. Malo, France (ICNaB 2018) 12th - 15th November 2018..
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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