Preparation method of composite cathode material containing single-crystal Li1+zMn2-x-yCoxAlyO4 and conductive polymer

A composite positive electrode material and conductive polymer technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance and low battery capacity, and achieve the effect of improving capacity and cycle performance

Inactive Publication Date: 2013-01-30
JIANGSU KING LITHIUM CELL
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Problems solved by technology

[0002] Traditional cathode materials for lithium-ion batteries that contain lithium sources, manganese sourc

Method used

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Embodiment

[0008] Example: Li 1.15 mn 1.92 co 0.04 al 0.04 o 4 Preparation method of composite cathode material with conductive polymer:

[0009] a. Mix the lithium source, manganese source, cobalt source, and aluminum source in a molar ratio of Li / Mn=0.61, Co / Mn=0.02, Al / Mn=0.02, and mix them in a three-dimensional mixer or a conical double-screw Machine, mechanical mixing 7h. The mixture was calcined at 800°C for 18 hours in a muffler furnace, then slowly cooled to 600°C, kept for 5 hours, then cooled to room temperature with the furnace, and air was introduced during the sintering process to prepare a single crystal Li 1.15 mn 1.92 co 0.04 al 0.04 o 4 compound; lithium source is battery grade lithium carbonate; manganese source is electrolytic manganese dioxide; cobalt source and aluminum source are oxides of cobalt and aluminum respectively;

[0010] b. Make a mixed solution of polymer monomer, oxidant, and surfactant in a molar ratio of 1:1:5, so that the mixed solution’s ...

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Abstract

The invention relates to a preparation method of a composite cathode material containing single-crystal Li1+zMn2-x-yCoxAlyO4 and a conductive polymer. The method comprises: (a) mechanically mixing a lithium source, a manganese source, a cobalt source and an aluminum source by a three-dimensional mixer or a conical twin-screw mixer for 6 to 8 hours, calcining the mixture at 700 to 900 DEG C for 10 to 24 hours while introducing air, slowly cooling to 600 to 700 DEG C, keeping temperature for 3 to 8 hours, cooling to the room temperature in the furnace to obtain a single-crystal Li1+zMn2-x-yCoxAlyO4 compound; and (b) preparing a mixture solution with a pH value not smaller than 3 and not larger than 7 from a polymer monomer, an oxidant and a surfactant at a molar ratio of 1:1:(4 to 6), adding the single-crystal Li1+zMn2-x-yCoxAlyO4 compound, reacting for 2 to 6 hours, washing the product with alcohol and water, filtering, and drying at 70 to 100 DEG C to obtain the composite cathode material. The actual test shows that the composite cathode material prepared by the method can remarkably improve the capacity and the cycle performance of a lithium battery.

Description

technical field [0001] The present invention relates to a kind of cathode material of lithium ion battery, specifically a kind of single crystal Li 1＋z mn 2-x-y co x al y o 4 A method for preparing a composite cathode material with a conductive polymer. Background technique [0002] Traditional cathode materials for lithium-ion batteries containing lithium sources, manganese sources, cobalt sources and aluminum sources have the defects of low battery capacity and poor cycle performance. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a single crystal Li that can improve the battery capacity and cycle performance of lithium-ion batteries. 1＋z mn 2-x-y co x al y o 4 A method for preparing a composite cathode material with a conductive polymer. [0004] Single crystal Li of the present invention 1＋z mn 2-x-y co x al y o 4 The preparation method of composite cathode material with conductive polymer is:...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 崔立峰李奇峰王辉杨克涛
Owner JIANGSU KING LITHIUM CELL
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