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 preparation process is complicated, and the specific capacity of the obtained material is only 169mAh / g at 2C

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