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Method for coating surface of lithium-ion ternary positive electrode material with oxide

A cathode material and surface coating technology, applied in the field of new energy materials, can solve problems such as coating, and achieve the effects of uniform coating degree, short process and uniform coating effect

Inactive Publication Date: 2018-06-22
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD +1
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for coating oxides on the surface of lithium ion ternary positive electrode materials, which has the advantages of simplicity and convenience, excellent coating effect and low cost, and is suitable for industrialized large-scale production, so as to solve the problems raised in the above background technology. The cycle stability of the ternary cathode material and the uniformity of the conventional coating method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Take 10g of NCA cathode material, add it to 250ml of deionized water, and stir evenly with magnetic force;

[0026] Step 2: successively add 1g of polyacrylic acid and 0.5g of magnesium carbonate to the mixed slurry in step 1 and stir until the magnesium carbonate powder completely disappears;

[0027] Step three: put the slurry obtained in step two at 80 o Dry under C conditions;

[0028] Step 4: transfer the dried material in step 3 to the muffle furnace, o Sintering at C temperature for 3h, the result is magnesium oxide coated NCA positive electrode material.

[0029] The magnesium oxide-coated NCA positive electrode material obtained in the above example 1 is homogenized with acetylene black and PVDF at a mass ratio of 8:1:1, assembled into a half-cell, and heated at 0.2C (1C=190mA / g) The current density is charged and discharged in the range of 2.8V-4.3V, and the specific capacity after 100 cycles is still 178mA / g, while the specific capacity of the unco...

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Abstract

The invention discloses a method for coating the surface of a lithium-ion ternary positive electrode material with an oxide. The method comprises the steps of firstly dispersing lithium-ion ternary positive electrode material powder into a certain amount of deionized water; dispersing the powder evenly, adding a certain amount of organic acid or salt and an insoluble metal salt to the powder and reacting for a certain period of time; and drying the treated ternary positive electrode material and carrying out thermal treatment at certain temperature for a certain period of time to obtain an oxide-coated lithium-ion ternary positive electrode material. According to the method disclosed by the invention, a whole-wet method is adopted and the lithium-ion ternary positive electrode material iscoated with liquid, so that the process of coating modification is short, the used raw materials are common, the cost is low, the ternary positive electrode material can be greatly and efficiently modified, the coating degree is uniform and the effect is good.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a method for coating oxides on the surface of lithium ion ternary positive electrode materials. Background technique [0002] At present, lithium-ion batteries have been widely used in various portable electronic products, power tools and energy storage systems. With the global energy and environmental problems becoming more and more serious, lithium-ion batteries are gradually moving towards the field of electric vehicle power from mobile phones, notebook computers, digital cameras and portable small appliances. Therefore, the cycle performance, energy density and safety of lithium-ion batteries Performance also puts forward higher requirements. The ternary material exerts the synergistic effect of nickel-cobalt-manganese or nickel-cobalt-aluminum, so its performance is better than that of a single-component layered cathode material, and it is considered to be one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/62Y02E60/10
Inventor 汤依伟吴剑文定强
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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