42results about How to "Reduce interface side reactions" patented technology

The invention discloses a modified single crystal type multielement anode material and a preparation method thereof. Lithium salt containing modified anions is dispersed to a water solution which contains dissolvable lithium salt and an organic pore-forming agent, a coprecipitation multihole precursor is added into the mixture, and then modified single crystal type multielement anode material which has the D50 equal to 2-30mu m and is quite high in monodispersity degree is successfully prepared through a 'once sintering' process. Compared with the prior art, the modified single crystal type multielement anode material provided by the invention has the following obvious advantages: (1) the 'once sintering' process is adopted, the technical route is simple, and the cost is reduced substantially; (2) the monodispersity degree of the prepared single crystal multielement anode material is quite high, the compaction density and the energy density are high, the high-temperature cycle performance is excellent, and the modified single crystal type multielement anode material can be applied to electric tools, such as high energy density type consume electronic products, electro-mobiles and the like.

The invention belongs to the technical field of lithium ion battery materials, and discloses a nickel-cobalt-boron precursor material, a nickel-cobalt-boron positive electrode material, and a preparation method. The chemical formula of the nickel cobalt boron precursor material is Ni x Co y B z (OH) 2 , using the CASTEP software to calculate the surface energy of the (003) crystal plane of the precursor material to be 1.1 to 2.5 J / m 2 . In the process of preparing nickel-cobalt-boron precursor materials by co-precipitation, the temperature of the reaction system is controlled to be 30-90 °C, the pH value is 11-12.8, the concentration of the complexing agent is 5-8 g / L, and the stirring speed is 300-450 rmp , The solid content is 150~400 g / L. The nickel-cobalt-boron precursor material is calcined with lithium to obtain a positive electrode material, and the positive electrode material can be further coated with an indium coating having conductive ions. The positive electrode material prepared by the invention has excellent electrochemical performance.

A gel polymer coated lithium ion battery positive electrode and a preparation method therefor are disclosed. The lithium ion battery positive electrode comprises a positive electrode current collector, and a positive electrode active layer formed by a positive electrode active material, a conductive agent and a binder; the surface of the positive electrode active layer is coated by a layer of tri(di-acryloxyethyl) polyphosphoester gel polymer. The preparation method comprises the steps of mixing the positive electrode active material, the conductive agent and the binder firstly, taking N-methyl pyrrolidone as a solvent, uniformly stirring and coating on aluminum foils, and drying to obtain a positive plate A; placing the positive plate A into an acetone solution containing tri(di-acryloxyethyl) phosphate monomer and photoinitiator, and after fully volatizing the acetone solution, and obtaining a positive plate B; and exposing the positive plate B in ultraviolet light to obtain the lithium ion battery positive electrode. The lithium ion battery positive electrode of the invention is excellent in cycle performance and thermodynamic stability under higher cut-off voltage.

The invention discloses a modified single crystal ternary positive electrode material and a preparation method thereof. The present invention replaces the traditional cross-linking agent with the hydrogen bond between the coordination bond formed by the unique β-diketone group in curcumin and the lanthanide metal ion and the polymer chain, so as to obtain high elasticity and ductility. Sulfonic acid type polymer; the generated sulfonic acid can effectively reduce the amount of residual alkali on the surface of the material, and has both high elasticity and ductility, which can effectively maintain the structure of the material during the repeated charging and discharging of the battery, and improve the battery cycle performance. .