A kind of preparation method and application of hierarchical structure cathode material for lithium ion battery

Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a hierarchical structure positive electrode material for lithium ion batteries and a preparation method thereof. The chemical formula of the hierarchical structure positive electrode material is specifically LiNi x co y Al 1‑x‑y o z Cl 2‑z ; 0.1≤x≤0.9, 0.1≤y≤0.9, 1.5≤z≤1.95, made by water mixing, molten salt mixing, sintering and crushing, by adding Cl element to replace the O element in the original NCA material, forming a different Compared with the NCA-like positive electrode of the traditional NCA material, the hierarchical structure positive electrode material has a regular and uniform microscopic morphology and has three characteristics of high potential, high specific energy, and high rate output.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a graded structure positive electrode material for lithium ion batteries and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are the latest generation of rechargeable batteries after NiMH batteries. Lithium-ion batteries have become a widely used battery system due to their advantages such as high lithium intercalation voltage, high specific energy, no memory effect, small self-discharge, and non-toxicity, and are generally recognized in high-energy portable electronic devices. The cathode material of lithium-ion batteries is one of the cores of lithium-ion batteries. The cathode material provides a large amount of freely deintercalated lithium ions during the charging operation of lithium ion batteries, which is crucial for improving the electrochemical performance of lithium ion batteries such as operat...

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Problems solved by technology

[0007] Patent CN201610741604.0 discloses the method of adding LiCl to the nickel-cobalt-aluminum co-precipitation precursor to co-calcine the NCA ternary cathode material, and the reversible specific capacity of the obtained NCA ternary cathode material is 148mAh / g, and the capacity retention rate is 85% , since LiCl was not added in the precursor stage but was added as a lithium salt to the formed NCA precursor and then calcined, the modification advantages of LiCl could not be exerted, and the final product was still LiNi x co y Al z o 2 (x+y+z=1), the Cl element is lost after high-temperature sintering, and the O element is not replaced, so the discharge performance is still not ideal

[0008] In short, there is no effective method in the prior art that can quickly prepare NCA-type cathode materials with good high-rate performance. It is difficult for existing NCA-type cathode materials to have three characteristics of high potential, high specific energy, and high-rate output. , does not meet the power supply requirements of modern advanced electronic equipment

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