Preparation method and application of no-clean high-nickel single-crystal lithium nickel cobalt manganate positive electrode material

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the field of lithium-ion power batteries for new energy vehicles, can solve the problems of high residual alkali on the surface and affect the safety performance of batteries, and achieve the effect of avoiding unfriendly environment

Inactive Publication Date: 2020-11-10
浙江格派钴业新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Whether the high-nickel ternary NCM cathode material is a secondary ball or a single crystal, there is a problem of excessive residual alkali on the surface, which seriously affects the safety performance of the battery.
At present, both academia and enterprises adopt the traditional water washing process, which can effectively reduce the residual alkali on the surface of materials; however, enterprises will face a large amount of waste water, which contains metal ions such as Ni, Co, and Mn, which requires a certain amount of financial resources. waste water treatment

Method used

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  • Preparation method and application of no-clean high-nickel single-crystal lithium nickel cobalt manganate positive electrode material
  • Preparation method and application of no-clean high-nickel single-crystal lithium nickel cobalt manganate positive electrode material
  • Preparation method and application of no-clean high-nickel single-crystal lithium nickel cobalt manganate positive electrode material

Examples

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Effect test

Embodiment 1

[0075] First, set D50 to 3.8 um and BET to 4.2 m 2 / g of small particle ternary precursor material Ni 0.8 co 0.1 mn 0.1 (OH) 2 (The NCM ternary precursor is prepared by a batch method, and the specific surface area BET is less than 5 m 2 / g; the cross-sectional morphology of the sphere is radially distributed, without obvious stratification, holes or cracks; the average grain size D50: 3.0-4.0 um), lithium hydroxide solution, and aluminum hydroxide suspension are placed in a ball mill tank, and the High-speed ball milling to mix evenly; wherein, the molar ratio of lithium element: precursor metal element is 1.04, and the mass fraction of aluminum element added in the total material is 2000 ppmw. After ball milling for 2 hours, put the slurry into the rotary spray drying equipment for rapid drying; then, the dried material is sintered once under the condition of high-purity oxygen at a temperature of 760°C, kept for 14 hours, and cooled ; Then go through jaw crushing, doub...

Embodiment 2

[0078] First, set D50 to 3.8 um and BET to 4.2 m 2 / g of small particle ternary precursor material Ni 0.8 co 0.1 mn 0.1 (OH) 2 , lithium hydroxide solution, and zirconium sulfate solution are placed in a ball mill tank, and are mixed uniformly by high-speed ball milling; wherein, the molar ratio of lithium: precursor metal element is 1.04, and the mass fraction of zirconium element added to the total material is 2000 ppmw. After ball milling for 2 hours, put the slurry into the rotary spray drying equipment for rapid drying; then, the dried material is sintered once under the condition of high-purity oxygen at a temperature of 760°C, kept for 14 hours, and cooled ; Then, go through jaw crushing, double rollers, crushing and sieving respectively; the conditions of jaw crushing, double rollers, crushing and sieving are as follows: inlet pressure: 0.8 MPa; gap between jaw crushing and double rollers: 0.2 mm; airflow crushing frequency : 150 Hz; grading frequency: 50 Hz, sievi...

Embodiment 3

[0081] First, set D50 to 3.8 um and BET to 4.2 m 2 / g of small particle ternary precursor material Ni 0.80 co 0.10 mn 0.10 (OH) 2 , lithium hydroxide solution, and magnesium chloride solution are placed in a ball mill tank, and are mixed uniformly by high-speed ball milling; wherein, the molar ratio of lithium: precursor metal element is 1.04, and the mass fraction of the added amount of magnesium element in the total material is 2000 ppmw. After ball milling for 2 hours, put the slurry into the rotary spray drying equipment for rapid drying; then, the dried material is sintered once under the condition of high-purity oxygen at a temperature of 760°C, kept for 14 hours, and cooled ; Then, go through jaw crushing, double rollers, crushing and sieving respectively; the conditions of jaw crushing, double rollers, crushing and sieving are as follows: inlet pressure: 0.8 MPa; gap between jaw crushing and double rollers: 0.2 mm; airflow crushing frequency : 150 Hz; grading frequ...

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Abstract

The invention relates to the technical field of lithium ion power batteries for new energy vehicles, in particular to a preparation method of a nickel cobalt lithium manganate positive electrode material of a high-nickel single crystal lithium ion battery. The preparation method comprises the following steps: (1) dissolving lithium hydroxide and an additive in deionized water, adding a granular and spherical NCM ternary precursor after the lithium hydroxide and the additive are completely dissolved, and performing stirring; (2) dynamically evaporating the slurry stirred in the step (1) to dryness, and performing sieving to obtain a powder material with better dispersity; (3) carrying out primary sintering under an oxygen-enriched atmosphere condition, and carrying out jaw crushing, rolleraligning, air flow crushing and sieving on the sintered material to obtain a single crystal primary sintering base material; (4) mixing the single crystal primary sintering base material with an acidic coating agent containing an element B, sintering again under the condition of a composite atmosphere of carbon dioxide and oxygen, and then carrying out jet milling and sieving to obtain the product.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries for new energy vehicles, in particular to a method for preparing a nickel-cobalt lithium manganese oxide positive electrode material for a high-nickel single crystal lithium-ion battery. Background technique [0002] With the decline of subsidy policies, both car companies and battery manufacturers have to work harder on cost control, including the reduction of precious metal material costs, R&D and manufacturing costs. The competition of new energy vehicles is reflected in the competition of batteries. With the gradual improvement of battery module technology and design level, for example, "blade battery" can significantly improve the volume utilization rate of batteries. The two mainstream positive electrode materials for power batteries for new energy vehicles are ternary nickel-cobalt lithium manganese oxide and lithium iron phosphate. The energy density of the former is si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 曹栋强龚丽锋方明张有新王红忠黄飞中
Owner 浙江格派钴业新材料有限公司
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