Modification method of lithium manganate battery material

Abstract

The invention relates to the technical field of lithium ion battery materials, in particular to a modification method of a lithium manganate battery material, which comprises the following steps: (1) adding a commercially available battery-grade layered lithium manganate material into a phosphoric acid solution for activating treatment, and stirring and dispersing for 3-9 minutes at a high speed by using a planetary ball mill to obtain a pretreated material; adding aluminum powder and glucose into the pretreated material, stirring while adding until no bubble exists, and continuously stirring at the speed of 20-100r / min for 20-40 minutes to obtain a mixture; then carrying out freeze drying to obtain a dried product; and crushing the dried product, and carrying out heat treatment to form the lithium manganate positive electrode material coated with an aluminum phosphate layer on the surface. According to the method disclosed by the invention, the existing layered lithium manganate is subjected to surface modification so as to reduce or avoid dissolution of manganese in an electrolyte and phase transformation from the layered lithium manganate to spinel type lithium manganate, so that the cycle performance of the lithium manganate lithium ion battery is improved.

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