Lithium-rich multi-component lithium ion battery positive pole material and preparation method thereof

Abstract

The invention discloses a lithium-rich multi-component lithium ion battery positive pole material and a preparation method thereof. The molecular formula of the lithium-rich multi-component lithium ion battery positive pole material is Li1.13Ni0.20Co0.20Mn0.47O2. The preparation method comprises the following steps of: completely dissolving cobaltous acetate, nickel acetate, manganese acetate and lithium acetate in alcohol by an alcoholysis solid-phase method; then drying a mixture of the dissolved cobaltous acetate, nickel acetate, manganese acetate and lithium acetate at 120 DEG C, thereby obtaining solid powder of a transition metal acetate precursor; and finally, sintering the obtained solid powder of the transition metal acetate precursor twice in a high-temperature tubular furnace system, and then carrying out ball-milling fully on the sintered solid powder to obtain the lithium-rich multi-component lithium ion battery positive pole material with particle diameter being less than 1 micron, favorable morphology and structure, small particle diameter distribution and good battery performance. The preparation method has the characteristics of simple preparation technology, low production cost, adaptability to large-scale production and the like.

Description

Technical field [0001] The present invention belongs to the field of lithium -ion battery positive material preparation technology, which involves a lithium -rich multi -composite lithium -ion battery positive electrode material and its preparation methods. Background technique [0002] Because lithium ion batteries are generally used as a negative electrode material, the theoretical capacity reaches 372 mAH / G, and the capacity of the positive electrode material is compared to the negative electrode material. [1] Therefore, the positive pole material is currently an important influencing factor restricting the overall battery performance of the lithium ion battery.Since the transition metal oxide positive material cobaltate (LICOO 2 ) [2] Since the success of the success, experts and scholars of various countries have continued to study the positive electrode materials of lithium ion battery, successfully studied and prepared other transition metal oxidation positive materials, s...

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Problems solved by technology

[0015] One of the purposes of the present invention is to provide a method for preparing a lithium-rich multi-component composite lithium-ion battery positive electrode material in order to solve the technical problems of the above-mentioned lithium-rich multi-component composite cathode material, such as complex preparation process, high cost, and difficulty in large-scale application.

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