A lithium-ion battery cathode sheet using a cobalt-free high-nickel cathode material

Abstract

The invention discloses a lithium-ion battery positive electrode sheet using a cobalt-free high-nickel positive electrode material, comprising a positive electrode current collector and a positive electrode active material layer loaded on the positive electrode current collector, and the composition of the positive electrode active material layer includes a cobalt-free high-nickel positive electrode material , conductive agent and binder, the molecular formula of cobalt-free high-nickel positive electrode material is Li(Ni 1‑ x mn x )Zr y o 2 , where 0.1≤x≤0.5, 0.002≤y≤0.003. When the cobalt-free high-nickel positive electrode material is prepared, it is first prepared by coprecipitation (Ni 1‑x mn x )Zr y (OH) 2 precursor; then combine the precursor with LiOH·H 2 O mixed calcined. The present invention uses zirconium-doped cobalt-free high-nickel layered positive electrode material, which can effectively improve the cycle performance and rate performance of the positive electrode sheet; the precursor prepared by coprecipitation method has complete morphology and uniform size, and the tested Zr content and doped The impurities are basically the same, and the structural stability and high temperature stability are good.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery positive electrode sheet using a cobalt-free high-nickel positive electrode material. Background technique [0002] Layered high-nickel ternary lithium-ion battery cathode material Li(Ni 1-x-y mn x co y )O 2 (x+y<0.5) has a high energy density and is currently one of the most promising cathode materials. Among them, cobalt is not only an active material, but also can effectively inhibit the mixing of cations (Li / Ni) and stabilize the material structure. Therefore, ternary materials containing cobalt generally have good deep discharge characteristics and good rate performance. However, due to the high price of cobalt and the lack of reserves, it is not conducive to large-scale use. It has gradually become the consensus of the industry to reduce the use of cobalt in cathode materials. [0003] Cobalt-free ternary cathode materials are usu...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the positive electrode material of cobalt-free lithium-ion batteries in the prior art is not satisfactory in terms of rate cycle performance and element composition regulation, and the positive electrode sheet made by using it is difficult to meet the long-cycle test that meets commercial standards. , provide a lithium-ion battery cathode sheet using a cobalt-free high-nickel cathode material, using a cobalt-free high-nickel-doped zirconium precursor (Ni 1-x mn x )Zr y (OH) 2 with LiOH·H 2 The cobalt-free high-nickel-doped zirconium material made by O mixed sintering is used as the positive electrode material, and the obtained positive electrode sheet has good cycle performance when used in lithium-ion batteries.

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