A method for improving the cycle performance of high-nickel cathode materials

A cathode material and cycle performance technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as poor cycle performance of high-nickel cathode materials, reduce Ni2+/Li+ mixed discharge, improve structural stability, The effect of stabilizing cycle performance

Active Publication Date: 2019-01-22
JIANGMEN KANHOO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can effectively reduce the residual alkali, the lithium in the crystal lattice in the high-nickel positive electrode material will be washed out by water washing, and the surface of the material after water washing has a higher activity. During roasting, the lithium in the crystal lattice will Migration to the surface leads to the appearance of a new residual alkali layer, resulting in a poor overall improvement in the cycle performance of high-nickel cathode materials

Method used

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  • A method for improving the cycle performance of high-nickel cathode materials
  • A method for improving the cycle performance of high-nickel cathode materials

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Put 1L of deionized water at 50°C in a 2L beaker in a water bath at 50°C, add lithium acetate into the deionized water while stirring until saturated, solids precipitate out, and filter to obtain a saturated lithium acetate solution at 50°C.

[0024] Take 800mL of the above-mentioned saturated lithium acetate solution at 50°C in a 2L beaker, add 400g of high-nickel cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 and 2 g of manganese acetate tetrahydrate, and stirred for 10 min, the filter cake after solid-liquid separation was dried in a vacuum oven at 120° C., then cooled and pulverized. The dry powder obtained after pulverization was kept at 680° C. for 8 hours, and then cooled at room temperature to obtain the final high-nickel positive electrode material.

Embodiment 2

[0026] Put 1L of deionized water at 50°C in a 2L beaker in a water bath at 50°C, add lithium tartrate into the deionized water while stirring until saturated, solids precipitate out, and filter to obtain a saturated lithium tartrate solution at 50°C.

[0027] Take 800mL of the above-mentioned saturated lithium tartrate solution at 50°C in a 2L beaker, add 400g of high-nickel cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 and 2 g of manganese acetate tetrahydrate, and stirred for 20 minutes, the filter cake after solid-liquid separation was dried in a vacuum oven at 120° C., then cooled and pulverized. The dry powder obtained after pulverization was kept at 690° C. for 8 hours, and then cooled at room temperature to obtain the final high-nickel cathode material.

Embodiment 3

[0029] Put 1L of 50°C deionized water into a 2L beaker in a 50°C water bath, add lithium gluconate into the deionized water until saturated and solids precipitate out while stirring, and filter to obtain a saturated solution of lithium gluconate at 50°C.

[0030] Take 800mL of the above-mentioned saturated lithium gluconate solution at 50°C in a 2L beaker, add 400g of high-nickel cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 and 2 g of manganese acetate tetrahydrate, and stirred for 30 minutes, the filter cake after solid-liquid separation was dried in a vacuum oven at 120° C., then cooled and pulverized. The dry powder obtained after pulverization was kept at 700° C. for 8 hours, and then cooled at room temperature to obtain the final high-nickel cathode material.

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Abstract

The invention discloses a method for improving the cycle performance of a high-nickel positive electrode material, which comprises the following steps: (1) using a saturated lithium salt solution to treat the high-nickel positive electrode material, wherein the saturated lithium salt solution is added with a manganese salt additive; 2) After the treatment is finished, solid-liquid separation is carried out and after drying and crushing, roasting is carried out under an oxygen atmosphere to obtain a high-nickel positive electrode material with high cycle performance; the Ni2+ / Li+ mixing degree of the high-nickel positive electrode material processed by the method of the present invention is obvious It is lower than only washing with deionized water. Under the cut-off voltage of 2.75-4.3V and 1C charge-discharge system, it shows stable cycle performance, which has greatly improved the performance of mobile lithium-ion batteries on the existing market.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a surface modification treatment method for improving the cycle performance of high-nickel cathode materials. Background technique [0002] The rapid development of China's new energy vehicles has brought about a strong demand for power lithium batteries. As new energy vehicles gradually penetrate into the lives of the public, people are more concerned about the battery life of new energy vehicles. In the new energy vehicle subsidy policy at the end of 2016, the battery energy density was included in the subsidy assessment for new energy vehicles for the first time. In the 2017 new energy vehicle subsidy policy, for electric passenger car batteries with an energy density of less than or equal to 120WH / KG, the longer the battery life, the more subsidies. When the energy density is greater than 120WH / KG, the higher the energy density, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 苏柏涛吴建华范江马真万国江
Owner JIANGMEN KANHOO IND
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