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Ultrahigh voltage lithium cobaltate and preparation method thereof

An ultra-high voltage, lithium cobalt oxide technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of material layer structure damage, material and electrolyte side reaction intensification, material loss of activity, etc.

Inactive Publication Date: 2017-11-10
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Increasing the charging voltage can make LiCoO 2 More Li+ is released in the positive electrode material, thereby improving the specific capacity of the material, but when LiCoO 2 After losing a large amount of Li+ in the material, the layered structure of the material will be destroyed and the material will lose its activity; on the other hand, under high charging voltage, the side reaction between the material and the electrolyte will intensify, so that the safety performance of the battery will be improved. great challenge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Cobalt oxide doped with Ni element is mixed with lithium carbonate and manganese dioxide. Wherein, the content of Ni in the cobalt oxide is 0.08wt%, calculated and weighed according to the Mn content is 0.09wt%, and the ratio of lithium to metal elements is 1.040. Put the mixture in a ball mill jar, mill it at a speed of 300rMd / s for 1 hour, and then put it in a roller furnace, and calcinate it in an air atmosphere at 1080°C for 10 hours. The calcined material was pulverized by a jet mill, and then sieved to obtain a lithium cobaltate material B with a median particle size of 15um.

[0029] Cobalt oxide doped with Ni element is mixed with lithium carbonate and manganese dioxide. Wherein, the content of Ni in the cobalt oxide is 0.05wt%, and the content of Mn in the cobalt oxide is 0.06wt%, and the ratio of lithium to metal elements is 1.005 for calculation and weighing. The mixture was placed in a ball mill jar, ball milled at a speed of 300rMd / s for 2 hours, then pla...

Embodiment 2

[0034] Cobalt oxide doped with Ni element is mixed with lithium carbonate and manganese dioxide. Wherein, the content of Ni in the cobalt oxide is 0.08wt%, calculated and weighed according to the Mn content is 0.09wt%, and the ratio of lithium to metal elements is 1.040. Put the mixture in a ball mill jar, mill it at a speed of 300rMd / s for 1 hour, and then put it in a roller furnace, and calcinate it in an air atmosphere at 1080°C for 10 hours. The calcined material was pulverized by a jet mill, and then sieved to obtain a lithium cobaltate material B with a median particle size of 15um.

[0035] Cobalt oxide doped with Ni element is mixed with lithium carbonate and manganese dioxide. Wherein, the content of Ni in the cobalt oxide is 0.05wt%, and the calculation and weighing are based on the Mn content being 0.06wt%, and the ratio of lithium to metal elements being 1.005. The mixture was placed in a ball mill jar, ball milled at a speed of 300rMd / s for 2 hours, then placed ...

Embodiment 3

[0040] Cobalt oxide doped with Ni element is mixed with lithium carbonate and manganese dioxide. Wherein, the content of Ni in the cobalt oxide is 0.01 wt%, calculated and weighed according to the content of Mn being 0.01 wt%, and the ratio of lithium to metal elements being 1.030. Put the mixture in a ball mill jar, mill it at a speed of 300rMd / s for 1 hour, and then put it in a roller furnace, and calcinate it in an air atmosphere at 1080°C for 10 hours. The calcined material was pulverized by a jet mill, and then sieved to obtain a lithium cobaltate material B with a median particle size of 18um.

[0041] Cobalt oxide doped with Ni element is mixed with lithium carbonate and manganese dioxide. Wherein, the content of Ni in the cobalt oxide is 0.01wt%, and the content of Mn in the cobalt oxide is 0.01wt%, and the ratio of lithium to metal elements is 1.005 for calculation and weighing. The mixture was placed in a ball mill jar, ball milled at a speed of 300rMd / s for 2 hour...

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Abstract

The invention relates to an ultrahigh voltage lithium cobaltate material and a preparation method thereof. The material is mainly used on a lithium ion secondary battery, so that the charging cut-off voltage of the battery can be up to 4.50V, and material has excellent cycle performance and safety performance. The general formula of the structure of the material is LiNixCo1-x-y-MyO2, wherein x is not smaller than 0.01 and is not greater than 0.08, and y is not smaller than 0.005 and is not greater than 0.1.The preparation method of the material comprises the following steps: separately mixing, ball milling and sintering a cobalt resource and a lithium source containing a doped element Ni with a compound containing an element M to obtain primary lithium cobaltate granules B and B1; mixing the primary lithium cobaltate granules B and B1 to obtain an intermediate product C; and mixing, ball milling and sintering the mixed intermediate product C with the compound containing the element M and the element Co to obtain the ultrahigh voltage lithium cobaltate material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, and in particular relates to an ultra-high voltage lithium cobalt oxide and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of smart terminals such as smartphones and tablet computers, components are required to develop in the direction of high performance and thinner, and higher and higher requirements are placed on the energy density and other performance of lithium-ion batteries. At present, the only mature battery that can meet the capacity requirements of these mobile devices is lithium cobalt oxide battery. In fact, lithium cobalt oxide materials have always occupied an absolute dominant position in the 3C digital product market due to their high energy density, high lithium ion conductivity, good cycle performance, and high rate performance. [0003] In order to design a lithium cobalt oxide battery with...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 徐世国靳亚珲栗志涛丁文秀宋健巍任正田
Owner GEM JIANGSU COBALT IND CO LTD
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