Lithium zirconate-cladded lithium-rich positive material for lithium ion battery and preparation method thereof

The invention discloses a lithium zirconate-cladded lithium-rich positive material for a lithium ion battery and a preparation method thereof. According to the invention, 0.4Li2MnO3.0.6LiNil/3Co1/3Mn1/3O2 is used as a core of a composite particle, and Li2ZrO3 is used as a shell of the composite particle of the lithium-rich positive material. Thus, an LMO-LZO core-shell structure of the composite particle with the particle size being 50nm-300nm is formed, and an LMO-LZO nano-composite material is formed. LZO accounts for 1wt%-10wt% of weight of the LMO-LZO lithium-rich positive material. By the utilization of the lithium-rich positive material of a battery, higher charge-and-discharge rate, higher specific capacity, better cycle performance and lower battery production cost can be realized. The preparation method has advantages of simple preparation technology and good repeatability, provides a high-capacity long-life lithium-rich positive material for manufacturing and application of a high-rate lithium ion battery, and is suitable for industrial production.