4results about How to "Improved physical contact" patented technology

The invention discloses a solid electrolyte coated porous microcrystalline graphite composite material, a composite negative electrode and a preparation method and application of the composite negative electrode. The solid electrolyte coated porous microcrystalline graphite composite material comprises porous microcrystalline graphite with a porous structure; the particle size compounded inorganic solid electrolyte comprises a gathering part filled in a porous structure, and coating parts distributed among particles of porous microcrystalline graphite and on the surface of the porous microcrystalline graphite. The composite negative electrode comprises a current collector, a solid electrolyte coated porous microcrystalline graphite composite material arranged on the surface of the current collector and metal compounded on the surface of the composite material. The surface of the porous microcrystalline graphite is coated with the compounded solid electrolyte with different particle sizes, so that the ionic conductivity of the material can be greatly improved, and uniform deposition and dissolution of metal are facilitated; and the prepared composite negative electrode has lower expansion, the porous microcrystalline graphite can contribute higher reversible capacity, and the composite negative electrode has the advantages of high capacity and high compaction.

The invention discloses a high-safety solid-state lithium metal battery which comprises a negative electrode, a solid-state electrolyte and a positive electrode and further comprises a heterogeneous interface layer located between the negative electrode and the solid-state electrolyte, and the heterogeneous interface layer is of a double-layer composite structure composed of a passivation layer and a polymer / semiconductor. The passivation layer is at least one of a nitride layer, an oxide layer, a nitrogen chemical layer, a carbon-based layer, a phosphate layer, a fluoride layer and a metal-based protection layer. The heterogeneous interface layer is introduced between the lithium metal negative electrode and the solid electrolyte, so that the physical contact between the lithium metal negative electrode and the solid electrolyte can be effectively improved, the growth of lithium dendrites can be prevented, the interface reaction between the lithium metal and the solid electrolyte can be reduced, and the problem of fire and combustion caused by thermal runaway at high temperature can be effectively inhibited; and the stability, safety and cycle performance of the solid-state lithium metal battery at room temperature and high temperature are enhanced.

This invention relates to the field of all-solid-state secondary battery technology and discloses a high-performance all-solid-state secondary battery equipped with a stabilized positive electrode, comprising a positive electrode, a negative electrode layer, and a solid electrolyte layer. The positive electrode is manufactured by coating and drying a slurry containing 80%-88% positive electrode active material, 10%-16% sulfide solid electrolyte, 1%-2% conductive agent, and 1%-2% binder, followed by a heat-pressurization treatment at 100℃-250℃ and 10MPa-100MPa. This invention constructs a dense interface stabilization layer in situ between the positive electrode active material and the sulfide electrolyte by applying a thermo-pressure coupling treatment to the positive electrode precursor. This stabilization layer improves the physical contact between the solid and solid interfaces and reduces interfacial impedance. Simultaneously, this stabilization layer acts as a physical barrier, inhibiting the oxidative decomposition of the electrolyte under high voltage, slowing capacity decay, and improving the battery's cycle life and structural stability.

The invention discloses a titanate self-assembly monomolecular passivation layer and a preparation method and application thereof, and belongs to the technical field of photovoltaic cells. A di (triethanolamine) titanium diisopropyl ester self-assembly molecular layer is introduced to the surface of a nickel oxide film, and a stable molecular-level buffer interface is constructed between nickel oxide and a perovskite light absorption layer. Titanate molecules can be subjected to coordination or condensation reaction with hydroxyl on the surface of nickel oxide, and interact with unsaturated nickel sites through a polydentate triethanolamine structure, so that surface hydroxyl defects and chemical activity of high-valence nickel ions are inhibited at the same time, and interface defect state density and non-radiative recombination loss are remarkably reduced. The passivation layer can be formed under a mild condition, the process is simple and is highly compatible with the preparation process of a trans-type device, and the photoelectric conversion efficiency and the long-term operation stability of the trans-type perovskite solar cell can be synchronously improved on the premise that the structural complexity of the device is not increased.