High-nickel cathode material, preparation method thereof and lithium ion battery

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as poor thermal stability, and achieve the effects of improving thermal stability, improving properties, and simple and easy methods.

Inactive Publication Date: 2017-05-10
GUANGZHOU LIBODE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, one of the purposes of the present invention is to provide a method for preparing a high-nickel positive electrode material to solve the technical problem of poor therm

Method used

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  • High-nickel cathode material, preparation method thereof and lithium ion battery
  • High-nickel cathode material, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0046] 200 parts by mass of Ni, Co, Mn in a molar ratio of 5:2:3 carbonate coprecipitate precursor and 1.8 parts by mass of lithium metasilicate were added to 200 parts by mass of deionized water and dispersed under mechanical stirring 2h to obtain the slurry; dry the resulting slurry at 120°C for 12h to obtain the precursor mixture; weigh 100 parts of the mass of the precursor mixture, add 31.76 parts of the mass of lithium carbonate (99.0%), in a three-dimensional mixer under the condition of 25Hz Mixed at low temperature for 4 hours, and then placed in a box-type furnace under an air atmosphere at 680°C for 6 hours; after cooling to room temperature, re-sintered at 960°C under an oxygen atmosphere for 12 hours, and passed through a 400-mesh standard sieve after cooling to obtain silicon doped Nickel cobalt lithium manganese oxide cathode material, also using DSC to test its exothermic peak temperature. Subsequently, according to the process conditions described in Comparati...

Embodiment 2

[0048] According to the same component content and process conditions in Example 1, the nickel-cobalt lithium manganate positive electrode material was prepared, but the quality of lithium metasilicate was increased from 1.8 parts to 3.6 parts, and the quality of lithium carbonate was reduced from 31.76 parts to 31.48 parts. Parts, the nickel-cobalt-lithium-manganese-oxide cathode material doped with silicon was obtained, and the exothermic peak temperature was also measured by DSC. Subsequently, according to the process conditions described in Comparative Example 1, the obtained positive electrode material was used to manufacture a polymer pouch battery of the same type, and its high-temperature cycle performance and high-temperature storage performance were also tested.

Embodiment 3

[0050] According to the same component content and process conditions in Example 1, the nickel-cobalt lithium manganese oxide positive electrode material was prepared, but the quality of lithium metasilicate was reduced from 1.8 parts to 0.08 parts, and the quality of lithium carbonate was increased from 31.76 parts to 32.03 parts. Parts, the nickel-cobalt-lithium-manganese-oxide cathode material doped with silicon was obtained, and the exothermic peak temperature was also measured by DSC. Subsequently, according to the process conditions described in Comparative Example 1, the obtained positive electrode material was used to manufacture a polymer pouch battery of the same type, and its high-temperature cycle performance and high-temperature storage performance were also tested.

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Abstract

The invention provides a high-nickel cathode material, a preparation method thereof and a lithium ion battery. A non-metal doping agent is added into a precursor of the high-nickel cathode material, and then a lithium source is added and sintered to obtain the high-nickel cathode material doped with a non-metallic element. According to the method, the doped element can be uniformly distributed in the material, the character on the surface of the material is improved, and the stability of a crystal structure is improved, so that the heat stability of the material is effectively improved, and the high-temperature cycle performance and high-temperature storage performance of the lithium ion battery are obviously improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery manufacture, and relates to a high-nickel positive electrode material, a preparation method thereof and a lithium-ion battery. Background technique [0002] With the increasingly prominent problems of energy crisis and environmental pollution, the development of sustainable new energy sources has become a top priority in modern society, and lithium-ion batteries, as a green secondary energy source, have attracted much attention. At present, the commercial lithium-ion battery cathode materials mainly include lithium cobaltate, lithium manganese oxide, lithium iron phosphate and conventional nickel-cobalt lithium manganese oxide ternary materials, but all of them have certain defects and cannot meet the higher energy density of lithium-ion batteries. and other performance requirements. And high-nickel cathode materials (such as Li(Ni with x≥0.7) x co y Al 1-x-y )O 2 , Li(Ni x co y mn 1-x-y...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525C01G53/00
CPCC01G53/006H01M4/362H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 吴宇鹏吴层邓孝龙严亮袁长福谭潮溥黄殿华陈瑞祥张郑袁昌杰骆宏钧
Owner GUANGZHOU LIBODE NEW MATERIAL
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