Constructing Self-Protected Li and Non-Li Candidates for Advanced Lithium Ion and Lithium Metal Batteries

Poly(vinylidene fluoride-co-hexafluoropropylene) and Li7La3Zr2O12-poly(vinylidene fluoride-co-hexafluoropropylene) films were introduced to both Li and non-Li anodes. Via the recombination of poly(vinylidene fluoride-co-hexafluoropropylene)- Li7La3Zr2O12, ionic conductivity of the anodes has been greatly improved and the deposition/plating barrier has been decreased. On the one hand, the thin film introduced upon lithium metal ensures the cyclic stability in both symmetrical cells and full cells. The Li metal with Li7La3Zr2O12-poly(vinylidene fluoride-co-hexafluoropropylene) films behaved stable over 500 hours with little increase of polarization. On the other hand, the modification upon Cu foil provides a long cycle life over 300 cycles in Li-Cu cells. Besides, when the poly(vinylidene fluoride-co-hexafluoropropylene)- Li7La3Zr2O12@Cu foil (non-Li anode) came to be failed, a type self-protected mechanism will be activated, ensuring better mechanical properties and safety.