A fluorophosphate lithium ion-electron mixed conductor modified lithium cobalt oxide composite material and preparation method thereof
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A fluorophosphate, mixed conductor technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of cycle performance, poor rate performance compatibility, etc., and achieve improved cycle stability, good lithium ion conduction characteristics, and improved rate. performance effect
Active Publication Date: 2019-07-16
HARBIN INST OF TECH
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[0005] The present invention aims to solve the technical problems of the cycle performance, rate performance and poor compatibility with the electrolyte of lithium cobalt oxide positive electrode materials at a high voltage of 4.55V, and provides a modified cobalt acid with fluorophosphate lithium ion-electronic mixed conductor Lithium composite material and preparation method thereof
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specific Embodiment approach 1
[0027] Embodiment 1: In this embodiment, a fluorophosphate-based lithium ion-electron mixed conductor modified lithium cobalt oxide composite material is a lithium cobalt oxide positive electrode material coated with a layer of lithium-containing fluorophosphate, wherein the coated The lithium cobalt oxide cathode material is a layered material with the chemical formula LiCo 1-x m x o 2 , where 0≤x≤0.2, M is one or more combinations of Mg, Ca, Cu, Ni, Al, Fe, Ti, Mn and Zr; the chemical formula of the cladding layer material is LiM'PO 4-y f 1+y , 0≤y≤1.2, where M′ is Zr, Fe, Sm, Pr, Nb, Ga, Zn, Y, Mg, Al, Cr, Ca, Ti, Cu, Sr, Ba, Ce, Sn, Sb, La and one or more combinations of Bi.
specific Embodiment approach 2
[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass ratio of the cladding layer material to the lithium cobalt oxide positive electrode material is 0.005-0.1. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0029] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the thickness of the cladding layer material is 2-200 nm. Others are the same as in the first or second embodiment.
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Abstract
The invention discloses a fluorophosphate lithium ion-electron mixed conductor modified lithium cobaltate composite material and a preparation method thereof, and relates to the fields of lithium ion battery positive electrode materials and preparation methods thereof. The technical problems to be solved in the invention are poor cycle performance, poor rate performance and poor compatibility with an electrolyte of lithium cobaltate positive electrode materials under a high voltage of 4.55V. The composite material is a lithium cobaltate positive electrode material coated with a layer of lithium-containing fluorophosphate, wherein the coated lithium cobaltate positive electrode material is a layered material and has chemical formula is LiCo1-xMxO2, x is not less than 0 and not more than 0.2, the chemical formula of the coating layer material is LiM'PO4-yF1+y, and y is not less than 0 and not more than 1.2. The method comprises the following steps: 1, preparation of a coating layer material solution; 2, preparation of a slurry; 3, drying; and 4, sintering. The preparation method has the advantages of simplicity, low cost, and easiness in industrialization realization. The fluorophosphate lithium ion-electron mixed conductor modified lithium cobaltate composite material is used for making lithium ion secondary batteries.
Description
technical field [0001] The invention relates to the field of lithium ion battery cathode materials and preparation methods thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, high working voltage, good cycle performance, small self-discharge, and small size. They have been widely used in mobile communication equipment, small electronic products, aerospace and biomedicine, and are gradually It is used in power battery fields such as pure electric vehicles and hybrid electric vehicles. [0003] The performance of lithium-ion secondary batteries is mainly determined by its positive electrode materials, and cobalt acid buried materials are most used in the market at present. However, with the continuous development of electronic products in recent years, the consumer market has put forward higher requirements for comprehensive performance such as capacity, cycle life, and safety performance of lithium-ion batteries....
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