Lithium ion battery positive plate using cobalt-free high-nickel positive electrode material

Abstract

The invention discloses a lithium ion battery positive plate using a cobalt-free high-nickel positive electrode material, and the positive electrode comprises a positive electrode current collector and a positive electrode active substance layer loaded on the positive electrode current collector; the positive electrode active substance layer comprises the cobalt-free high-nickel positive electrodematerial, a conductive agent and a binder, the molecular formula of the cobalt-free high-nickel positive electrode material is Li(Ni<1-x>Mnx) ZryO2, wherein 0.1<=x<=0.5, and 0.002<=y<=0.003. The preparation method of the cobalt-free high-nickel positive electrode material comprises the following steps: preparing a (Ni<1-x>Mnx)Zry(OH)2 precursor through a coprecipitation method; and mixing and calcining the precursor and LiOH.H2O. The zirconium-doped cobalt-free high-nickel layered positive electrode material is used, so the cycle performance and the rate capability of the positive plate can be effectively improved; the precursor prepared by using the coprecipitation method is complete in morphology and uniform in size, the tested Zr content is basically consistent with the doping amount,and the structural stability and the 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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