Core-shell structure gradient nickel-cobalt-manganese ternary positive electrode material precursor and preparation method thereof

Abstract

The invention discloses a core-shell structure gradient nickel-cobalt-manganese ternary positive electrode material precursor and a preparation method thereof. The ternary positive electrode materialprecursor is core-shell structure particles with the average particle size of 4-12 [mu]m, wherein an inner core is hydroxide precipitates of nickel, cobalt and manganese, a shell layer is carbonate precipitates of nickel, cobalt and manganese, the nickel content decreases gradually from the center of the core-shell structure particles to the surface of the shell layer, the manganese content increases gradually from the center of the core-shell structure particles to the surface of the shell layer, and the cobalt content is distributed evenly between the center of the core-shell structure particles and the shell layer. The invention also discloses the preparation method of the ternary positive electrode material precursor. A ternary positive electrode material obtained after the ternary positive electrode material precursor is mixed with lithium and calcined is assembled into a battery, at 0.1 C, the first discharge capacity can reach 198 mAh/g and still keeps at 182 mAh/g after the battery is circulated for 100 cycles, and the specific discharge capacity can reach 176.3 mAh/g at 5 C. The method is simple in process, low in cost and suitable for industrialized production.

Description

technical field [0001] The invention relates to a nickel-cobalt-manganese ternary cathode material precursor and a preparation method thereof, in particular to a core-shell structure gradient nickel-cobalt-manganese ternary cathode material precursor and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, the popularity of electronic products such as smartphones and laptops, and new energy electric vehicles have put forward higher requirements for lithium-ion batteries. Ternary materials, as one of the cathode materials for lithium-ion batteries, are recognized as one of the most promising cathode materials for lithium-ion batteries due to their advantages of high voltage, high specific capacity, and low cost. [0003] In order to obtain higher energy density, two methods are currently used for ternary materials, namely spherical materials and materials with high nickel content. However, in actual use, high-nicke...

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Problems solved by technology

However, this method needs to adopt the methods of coprecipitation and spray drying respectively, the pre

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