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The mitigation of decomposition reactions of lithium-ion battery electrolyte solutions is of critical importance in controlling device lifetime and performance. However, due to the complexity of the system, exacerbated by the diverse set of electrolyte compositions, electrode materials, and operating parameters, a clear understanding of the key che...
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Context 1
... cells were assembled in a two-compartment half-inch inner-diameter Swagelok cell as shown in Figure 1a. A lithium-ion conducting glass-ceramic (Ohara, Japan) was placed between two borosilicate glass fibre separators (Whatmann, GF/B, 0.68 mm thick, 1.0 μm pore size), so that the species formed at each electrode could be identified separately and so further reactions of these species at the opposite electrode are prevented. ...Context 2
... cells were assembled in a two-compartment one-inch Swagelok cell, in a similar way as described above, except larger electrodes (Ø 17 mm lithium metal foil disk and Ø 20 mm LiCoO2 electrode), separators (Ø 25 and 20 mm) and more electrolyte (400 L for the anode and 250 L for the cathode) were used in the one-inch Swagelok setup (Figure 1b). A stainless-steel mesh was placed on top of the LiCoO2 electrode to ensure electrical contact between the cathode and lithium metal anode, while simultaneously allowing for any formed gases to diffuse into the headspace. ...Context 3
... glass Hcell with two compartments separated by three separators (Celgard 2400), in order to limit convective mixing between the two halves, was filled with 6 mL of electrolyte (LP30; 1 M LiPF6 in EC:DMC=50:50 (v/v) in each compartment. A Pt wire (working electrode, 5 cm) and a Ag/AgCl (saturated KCl in acetonitrile) electrode (reference electrode) were placed in one half and a stainless-steel mesh (counter electrode, approx. 2 cm × 6 cm) was placed in the other (Figure S 1). The H-cell components were dried for several hours at 60 °C and transferred while still hot into an argon-filled glovebox, where all assembly and electrochemical measurements were performed. ...Context 4
... electrolyte: The 19 F{ 1 H} spectrum measured from the pristine electrolyte (Figure 4c and f) shows a major signal from LiPF6 (-74.5 ppm, d, 1 JP-F = 710 Hz, see Figure S11 for the 31 P NMR spectrum), and minor signals from LiPO2F2 (-82.9 ppm, d, 1 JP-F = 955 Hz) and HF (-171.6 ppm) impurities. 51,53,54 4.6 V: The 19 F NMR spectrum of the electrolyte from the LiCoO2 side (Figure 4e) reveals no detectable fluorine-based decomposition products. ...Context 5
... repeating the experiment using an electrolyte without EC (i.e. 1M LiPF6 in DMC), the signals corresponding to the electrolyte decomposition products originating from EC and DMC can be separated (Figure S 16). A list of the observed signals in the 1 H, 19 F and 31 P NMR spectra (Table S 3) as well as a detailed discussion of their assignments are given in the SI. ...Context 6
... formation of LMC, lithium methoxide and methanol could similarly be explained via the hydrolysis of DMC (Scheme 10c), in addition to the electrochemically-induced pathways described in Scheme 9b. Evidence that these species can form through hydrolysis is provided by the 1 H NMR spectrum of electrolyte deliberately spiked with 100,000 ppm water after storage for 2 months ( Figure S 21), which shows the presence of LEMC, LMC, lithium methoxide and methanol (see SI for more details). ...Similar publications
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