Abstract: A negative electrode plate includes a negative current collector, a lithium metal negative electrode, and a negative electrode framework. A polarization electric field exists inside the negative electrode framework. A direction of the polarization electric field is directed from a surface of the negative electrode to the negative current collector. A material of the negative electrode framework includes at least one of a piezoelectric polymer, piezoelectric ceramic, or piezoelectric monocrystal. The negative electrode plate can control lithium deposition sites, effectively suppress the growth of lithium dendrites, effectively mitigate volume expansion of the electrochemical device, and further improve cycle performance of the electrochemical device.

Abstract: A negative electrode plate includes a negative current collector and a piezoelectric layer. A polarization electric field exists on the piezoelectric layer. A direction of the polarization electric field is directed from the negative current collector to a surface of a negative electrode. A material of the piezoelectric layer includes at least one of a piezoelectric polymer, piezoelectric ceramic, piezoelectric monocrystal, or an inorganic piezoelectric material. The negative electrode plate can control lithium deposition sites, effectively suppress the growth of lithium dendrites, and significantly improve the cycle performance and safety performance of the lithium metal battery.

Abstract: A magnetic current collector includes a permanent magnet material layer. In the permanent magnet material layer, remanence intensity of a permanent magnet material is 0 T to 2 T. The magnetic current collector can introduce a magnetic field into the lithium metal battery. The magnetic field interacts electromagnetically with an electric field exerted by the battery to quicken a mass transfer process of lithium ions at an interface between a negative electrode and an electrolytic solution, homogenize a current density generated by a lithium-ion flow on a surface of the negative electrode, quicken a mass transfer process of lithium ions in a direction parallel to the current collector, and homogenize the distribution of lithium ions, so as to suppress lithium dendrites and improve the cycle performance of the lithium metal battery.

Abstract: The present disclosure discloses an ion conductor with high room-temperature ionic conductivity and a preparation method thereof. This method employs solid-phase sintering and ion exchange technologies, and can prepare crystalline and amorphous transition metal silicate by adjusting the addition ratio of sodium source. The chemical formula of the prepared transition metal silicate is A2-2xMSiO4-x, wherein A is Na, Li, Mg, Ca, or Zn; M is a transition metal Fe, Cr, Mn, Co, V, or Ni, when 0<x?0.5, the prepared transition metal silicate is crystalline, and the degree of crystallization decreases as x increases; and when 0.5<x<1, the transition metal silicate is amorphous.