Lithium ion battery positive electrode material as well as preparation method and application thereof

Abstract

The invention discloses a lithium ion battery positive electrode material as well as a preparation method and application thereof. The preparation method comprises the steps of dissolving a water-soluble titanium source and a water-soluble aluminum source in water according to a chemical general formula Al2Ti<1+a>O5, and uniformly mixing to obtain a mixed solution; uniformly mixing hydrogel and a ternary positive electrode material to obtain a first mixture; dropwise adding the mixed solution into the first mixture to obtain a second mixture; and performing plasma activation on the second mixture, sintering, crushing and sieving to obtain the lithium ion battery positive electrode material. The preparation method is simple to operate and low in cost, and the obtained lithium ion battery positive electrode material is low in residual alkali content, stable in interface structure and excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery cathode material and a preparation method and application thereof. Background technique [0002] With the development of new energy vehicles, higher requirements are put forward for power lithium batteries. Among them, energy density, cost, safety, thermal stability, and cycle life are the five key performance indicators of power lithium batteries. As the core of the power lithium battery, the positive electrode material directly affects the performance of the power lithium battery. At present, the cathode materials that have been widely used in the market mainly include lithium cobalt oxide (LCO), lithium manganese oxide (LMO), lithium iron phosphate (LFP) and ternary materials (NCM / NCA). Among them, lithium iron phosphate and lithium manganese oxide materials do not have much room for technological breakthroughs in basic research...

AI Technical Summary

Problems solved by technology

Although coating layers such as metal oxides and hydroxides can effectively improve the cycle performance of the material, the presence of the coating layer has a certain barrier effect on the deintercalation of lithium ions, resulting in a decrease in the first-round charge-discharge capacity of the material. decline

With the improvement of the voltage system of the lithium-ion battery, fast charging under high temperature conditions will intensify the damage to the positive active material in the positive electrode of the lithium-ion battery, especially when the doping and / or coating amount of the positive active material increases, the positive electrode The DC internal resistance (DCR) of the sheet increases to a certain extent, and the rate performance deteriorates. When the charging speed is accelerated, it is easy to cause the overpotential of the positive electrode sheet to increase, and the polarization of the positive electrode increases, which will have an adverse effect on the cycle.

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