Manganese-based metal organic framework compound-coated lithium ion battery ternary positive electrode material and preparation method thereof

Abstract

The invention discloses a manganese-based metal organic framework compound-coated lithium ion battery ternary positive electrode material. Based on the self-assembling performance of an MOFs material,coating of a spherical ternary positive electrode material is realized through a simple one-step method; the positive electrode material has a layered structure, is free of impurity phase, and structural changing of the material is not caused by coating; and the positive electrode material has a two-stage spherical-like structure formed by sheet-rod-like small particles in an clustering manner. The preparation method comprises the steps of 1) preparation of a precursor; 2) preparation of a spherical ternary positive electrode material; and 3) preparation of the manganese-based metal organic framework compound-coated ternary positive electrode material. According to the application as the battery positive electrode material, the discharge specific capacity is 160-180mAh g<-1> after 50 cycles of constant current charging and discharging at 0.5C; and the discharge specific capacity is 140-160mAh g<-1> at high rate of 10C. The positive electrode material has the advantages of providing porous channels, improving wetting degree, improving cycling stability and high-rate cycle performance, reinforcing stability of M-O bond energy, low cost, simple operation and suitability of large-scale production.

Description

technical field [0001] The invention relates to a novel composite porous material, in particular to a lithium-ion battery ternary cathode material coated with a manganese-based metal-organic framework compound and a preparation method thereof. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution, the development of clean and sustainable new energy has become the focus of scientists all over the world. As an important part of the lithium-ion battery - the positive electrode material, its operating voltage range, long-term cycle life, charge and discharge capacity, safety and stability, etc. play a decisive role in the overall performance of the entire lithium-ion battery and become a decision One of the key constraints on the performance of lithium-ion batteries. [Solid State Ionics 2012, 221, 1-5] [0003] At present, the cathode materials that have received extensive attention mainly include LMO with layered s...

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Problems solved by technology

[0006] In view of the shortcomings of the existing ternary cathode materials such as high-rate charge-discharge performance and poor cycle stability under high charge cut-off voltage, metal-organic framework compounds are used to coat the surface of the material. The purpose is not to reduce the specific capacity of the material. Improve the cycle stability and high rate performance of materials

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