33results about How to "Excellent high rate charge and discharge performance" patented technology

It is an object of the present invention to provide an active material for lithium ion battery capable of producing a lithium ion battery having an excellent high rate charge and discharge performance and a lithium ion battery having an excellent high rate charge and discharge performance. The present invention provides an active material for lithium ion battery represented by a composition formula: Li[Li(1-x) / 3AlxTi(5-2x) / 3]O4 (⅛≦x<1) lithium titanate is substituted with Al, and a lithium ion battery using this active material as a negative electrode active material.

The invention provides a positive electrode material for a lithium ion battery, the positive electrode material comprises a positive electrode active material, the structural formula of the positive electrode active material is Li2+xMSi1-xNxO4, wherein, M is selected from Mn, Fe or Mn1-yFey, N Selected from Ti, Cr or Ti1-zCrz, 0.01<x≤0.5, 0<y<1, 0<z<1. At the same time, the present invention also provides a preparation method of the above positive electrode material. The preparation method of the present invention has a simple process, and the prepared positive electrode material has excellent performance, stable structure, high specific capacity, coulombic efficiency and good cycle performance, and also has excellent high rate charge and discharge performance.

The invention provides a lithium ion battery anode material, which comprises a silicate material and a carbon material, wherein the content of the silicate material is 85 wt percent to 97 wt percent, and the content of the carbon material is 3 wt percent to 15 wt percent; and the structural formula of the silicate material is Li2MSiO4, and M is selected from Mn, Fe and Mn(1-x)Fe(x), wherein x is more than 0 and less than 1. Furthermore, the invention also provides a preparation method for the anode material and a lithium ion battery adopting the anode material. The process of the preparation method of the invention is simple; and the prepared anode material has high performance and a stable structure, is applied to the lithium ion battery, has high initial charging efficiency and relatively high specific capacity, and can bear high-rate charge and discharge.

The invention relates to a lithium battery with a polymer-coated sulfur / carbon composite material as an anode. According to the invention, sublimed sulfur or sulfur powder and a conductive carbon material are mixed according to a mass ratio of 3:7-8:2; the mixture is subject to ball milling, such that a sulfur / carbon composite material is obtained; the composite material is dispersed in a solution, and a polymer monomer is added to the solution; under a low temperature and the protection of inert gas, an oxidizing agent is added for initiating polymerization; the material is centrifuged, washed, and dried; the obtained polymer-coated elemental sulfur / carbon composite material, acetylene black and PTFE are mixed; a dispersant is added to the mixture, and the mixture is sufficiently mixed by stirring; the mixture is rolled into a sheet, and is vacuum-dried under a temperature of 55 DEG C, such that an electrode sheet is obtained. The prepared electrode sheet is adopted as an anode, metal lithium is adopted as a cathode, and a solvent type organic solution system containing 0.2mol / L of a waterless lithium nitrate additive is adopted as electrolyte, and a battery is assembled. With the electrode material, the assembled lithium battery is advantaged in high specific capacity, good circulation stability, and excellent heavy-current charge / discharge performances. The preparation method is advantaged in simple process, low cost, and good repeatability.

A kind of porous thin TiNb for negative electrode of lithium ion battery 2 o 7 The invention discloses a method for preparing nanocrystals, and relates to the technical field of preparation of negative electrode materials for lithium ion batteries. Firstly, titanium source and niobium source are added to the mixed solution of ethylene glycol and isopropanol in a certain proportion, then hexamethylenetetramine is added to mix and stir evenly, then the reaction solution is placed in the reaction vessel for reaction, and finally post-treated Porous and flake TiNb 2 o 7 Nanocrystalline anode materials. The preparation method of the present invention is simple, and the repeatability of the experiment is high; the prepared negative electrode material is in the shape of nano flakes, the flake size is 300-600nm, the thickness is 10-30nm, and has a large specific surface area and porosity, which is beneficial to the electrolyte solution. Permeation and transport of lithium ions, thereby improving the electrochemical performance of the material. As a lithium-ion battery negative electrode, it has high reversible capacity and first-time efficiency, excellent high-rate charge-discharge performance and excellent rate cycle performance.

The invention provides a method for preparing a composite anode material of super capacitor lithium titanate, which is used for solving the problems that the negative electrode material of the super capacitor, which is prepared according to the existing method for preparing the negative electrode material of the super capacitor, has insufficient property, pollution and the like. The preparing method comprises the following steps: A, respectively weighing Li2CO3 powder, TiO2 powder and a proper amount of dispersing agent based on mass ratio of each element in Li4Ti5O12; B, mixing the raw materials in a mixing tank, placing the mixture in a ball mill for ball-milling, drying the materials subject to the ball-milling, sintering, and cooling to room temperature; and C, adding CuO to the cooled materials, wherein the weight of the CuO is equal to 3-6% of that of the cooled materials, carrying out ball-milling, drying, sintering, cooling to room temperature, porphyrizing and drying to obtain the composite anode material. The method for preparing the composite negative electrode material of the super capacitor lithium titanate has the advantages of simple technology, high material property, no pollution, and high cyclical stability.