7results about How to "Low electronic conductivity" patented technology

The invention discloses a modified lithium borohydride solid electrolyte and a preparation method thereof, and belongs to the field of all-solid-state battery electrolyte preparation, the method comprises the following steps: mixing LiBH4 and lithium halide according to a formula ratio, and carrying out ball milling and heating to obtain an xLiBH4-LiX (x = 1-5) solid solution; then mixing and ball-milling B2O3 and the LiBH4-lithium halide solid solution to obtain a doped and composite synergistically modified (xLiBH4-LiX) y-B2O3 (y is equal to 10 to 20) solid electrolyte; a LiBH4 phase is stabilized by doping lithium halide, and grain gaps are densified by compounding B2O3, so that the grain boundary impedance is reduced, the lithium dendrite inhibition capability of the lithium borohydride-based solid electrolyte is improved, the stable operation of the lithium borohydride-based solid electrolyte at high voltage is ensured, and the lithium borohydride-based solid electrolyte has relatively high ionic conductivity, relatively low electronic conductivity and a relatively wide electrochemical window; and the lithium borohydride-based solid electrolyte has good stability and compatibility with a lithium metal negative electrode, and development of the lithium borohydride-based solid electrolyte in commercial application of a lithium ion battery is facilitated.

The invention discloses a preparation method of a biomass charcoal / magnesium composite material with low electron conductivity, and relates to a preparation method of a biomass charcoal / magnesium composite material. The invention aims to solve the problem that the biomass charcoal is easy to fail in the battery circulation process when serving as a magnesium ion artificial protection interface due to electronic conductivity. The method comprises the following steps: mixing biomass charcoal with potassium hydroxide, and carrying out heat treatment on the mixture under a protective atmosphere; washing and drying the sample subjected to heat treatment to obtain activated biomass charcoal; and carrying out pressure infiltration on the activated biomass charcoal, magnesium metal and magnesium alloy to obtain the activated biomass charcoal / magnesium composite material. The potassium hydroxide is used for activating the biomass charcoal, so that the conjugated structure of the material is damaged, the electronic conductivity of the biomass charcoal is reduced, the electronic conductivity of the biomass charcoal / magnesium composite material is reduced, and the reduction decomposition when the biomass charcoal / magnesium composite material is used for a negative electrode plate is relieved; and the cycling stability and the charge-discharge efficiency of the biomass charcoal / magnesium composite material negative pole piece are improved.

The invention discloses a sulfide composite electrolyte as well as a preparation method and application thereof, and relates to the technical field of solid-state batteries, an organic coating agent and an organic solvent are mixed, oxide nanoparticles are dispersed in the mixture, a precipitate is extracted and dried to obtain an oxide-organic coating agent composite material, then the oxide-organic coating agent composite material is subjected to ball milling treatment in the sulfide electrolyte, and the sulfide composite electrolyte is obtained. The sulfide composite electrolyte solves the problems of lithium dendrites and self discharge existing in a sulfide all-solid-state battery, the prepared sulfide composite electrolyte can smoothly transmit lithium ions, meanwhile, electron transfer between sulfide electrolyte interfaces is blocked, the electron conductivity is reduced, and the service life of the sulfide all-solid-state battery is prolonged. The growth of lithium dendrites along gaps of sulfide electrolyte is favorably inhibited, and the problem of lithium dendrites in a solid-state battery can be reduced. The preparation method provided by the invention is simple in process, low in equipment requirement and easy to amplify.

The invention relates to an electrode pole piece and a lithium ion battery in the technical field of lithium batteries, the electrode pole piece comprises a current collector and an active substance layer at least arranged on one side of the current collector, a functional layer is arranged on one side, far away from the current collector, of the active substance layer, the functional layer is of a multi-layer structure, and the functional layer is arranged on the current collector. Each functional layer comprises an inorganic solid electrolyte and a polymer, the functional layer further comprises a conductive agent, and the mass ratio of the conductive agent in each functional layer is gradually reduced in the direction away from the active material layer. According to the invention, the functional layers with a multi-layer structure are arranged, and the mass ratio of the conductive agent in each functional layer is gradually reduced along the direction far away from the active substance layer, so that the electric performance of the battery can be ensured, and meanwhile, direct contact of positive and negative pole pieces can be blocked when the diaphragm is shrunk or punctured, and the like, and a battery cell is prevented from being out of control.

This invention provides a core-shell structured sulfide electrolyte, its preparation method, and a solid-state battery. The core-shell structured sulfide electrolyte includes a sulfide solid electrolyte and a shell layer coating the surface of the sulfide solid electrolyte; the shell layer is composed of hydrophobic silica; wherein the hydrophobic silica is obtained by hydrophobic modification of silica with a modifier; the modifier includes a coupling agent for hydrophobic modification. This core-shell structured sulfide electrolyte exhibits higher air stability and chemical stability, which is beneficial for the application of sulfide electrolytes in solid-state batteries.

The application discloses a kind of solid electrolyte and preparation method thereof, polymer composite solid electrolyte and solid lithium battery, belong to solid lithium battery technical field, solid electrolyte includes lithium-containing transition metal oxide and doped element doped in lithium-containing transition metal oxide;The chemical formula of the solid electrolyte is Li x M (1‑y) N y O z ;Wherein, M is any one of transition metal, and the transition metal includes any one of Co, Ni or Mn, N is any one or more of doped element, x>0, 0.001≤y≤0.5, z>0.The solid electrolyte provided by the application has high ionic conductivity, controllable electronic conductivity, good interface compatibility, strong environmental stability and low cost, and is suitable for existing solid lithium battery system.

The invention belongs to the technical field of a solid electrolyte of a lithium ion battery, and discloses a modification and preparation method of a lithium ferrous silicate material, and the lithium ferrous silicate material is used as an inorganic filler and is mixed with a poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymer matrix to prepare a solid composite electrolyte. According to the invention, sodium doping is carried out on the lithium ferrous silicate material, and doped sodium replaces part of lithium sites, so that a lithium ion migration channel is widened, and the lithium ion conductivity of the lithium ferrous silicate is enhanced; the modified lithium ferrous silicate is used as an active filler and is combined with a polymer to prepare the composite electrolyte (CPE), so that on one hand, the mechanical strength of a polymer matrix is enhanced, and on the other hand, the migration path of lithium ions is widened, thereby remarkably improving the ionic conductivity and the lithium ion transference number of the composite electrolyte; the composite electrolyte has good interface contact with an electrode plate, and the cycling stability of the battery can be further improved.