4results about How to "Improve discharge specific capacity" patented technology

The invention belongs to the technical field of electrochemical energy storage batteries, and particularly relates to a chlorine-free simple magnesium salt electrolyte for a magnesium-sulfur battery as well as a preparation method and application of the chlorine-free simple magnesium salt electrolyte. The electrolyte comprises magnesium salt, ionic liquid, an organic ether solvent, an amine solvent and an organic phosphide additive. The solvation structure is regulated and controlled through the synergistic effect of multiple components, the compatibility of the electrolyte with the sulfur positive electrode and the magnesium negative electrode is improved, and the electrochemical performance of the magnesium-sulfur battery is improved. Specifically, the amine solvent is used as a strong polar solvent to improve the solubility of the magnesium polysulfide, so that the diffusion and redox conversion kinetics of the magnesium polysulfide are promoted, and the organic phosphide is used as an additive to effectively improve the specific discharge capacity and voltage platform of the magnesium-sulfur battery. Meanwhile, due to the addition of the ionic liquid, the stability of a magnesium negative electrode / electrolyte interface is improved, the transmission capacity of Mg < 2 + > is enhanced, and the overpotential of magnesium deposition / dissolution is reduced. In addition, the electrolyte does not contain chloride ions, so that the corrosion problem caused by the chloride ions is avoided.

This invention discloses a cathode material and its preparation method, a cathode electrode sheet, and an all-solid-state lithium battery, belonging to the field of all-solid-state lithium battery technology. The cathode material includes a core and a composite coating layer covering the surface of the core. The core includes a ternary cathode material. The composite coating layer includes an inner coating layer, a middle coating layer, and an outer coating layer arranged sequentially from the inside out. The inner coating layer is a solid electrolyte, the middle coating layer is at least one of lithium niobate, lithium zirconate, and lithium tantalate, and the outer coating layer is lithium phosphate. Both the middle and outer coating layers are continuous films. Along the diameter direction of the core, the elastic modulus of the inner coating layer is greater than that of the middle coating layer, and the elastic modulus of the middle coating layer is greater than that of the outer coating layer.

The invention relates to the technical field of lithium ion battery materials, and discloses a perovskite-doped positive electrode material as well as a preparation method and application thereof. The preparation method of the perovskite-doped positive electrode material provided by the invention comprises the following steps: S1, mixing a lithium source, a phosphorus source, an iron source, an element A source, an element B source, an organic carbon source and a solvent to obtain a precursor solution; and S2, performing spray pyrolysis on the precursor solution to obtain the perovskite-doped lithium iron phosphate positive electrode material, the spray pyrolysis comprises the steps of atomizing the precursor solution into liquid drops, and sequentially carrying out a preheating stage, a reaction stage and a cooling stage; segmented temperature control is adopted in the reaction stage. According to the method, a one-step spray pyrolysis method is adopted, so that the process flow is remarkably simplified, the production efficiency is greatly improved, and the electrochemical performance of the material is improved while the energy consumption is greatly reduced.

The invention provides a lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. In the lithium-rich manganese-based positive electrode material, Mg and P elements are uniformly distributed from a bulk phase to the surface, W element is uniformly distributed in the bulk phase, the surface is in gradient distribution with gradually increased concentration, the content of W in the bulk phase is a, and the average content of the surface is b, 0% lt; a is less than or equal to 0.6 mol%, alt; and b < = 2mol%. According to the invention, through synergistic doping of multiple elements on the body surface, the cycling stability and the voltage drop of the positive electrode material, especially the high-temperature cycling performance, can be remarkably improved, and meanwhile, the specific discharge capacity and the first efficiency of the lithium ion battery are also remarkably improved.