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Operando XRD of P2-Na x TiS 2 in 1 M NaPF 6 in EC/DMC electrolyte during the first cycle at 0.125 C. Right side, pink symbols, corresponding a lattice parameter; right side, green symbols, corresponding average interlayer spacing; grey dahsed line, fully desodiated state. A typical intercalation reaction was detected when using the EC/DMC-based electrolyte. A reversible phase transition of P2OP4O2 is demonstrated in layered sulfide cathodes for the first time.

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