Preparation method of large single crystal lithium ion battery nickel cobalt lithium manganate cathode material

A nickel-cobalt lithium manganese oxide and lithium-ion battery technology, which is applied in the field of lithium-ion power batteries for new energy vehicles, can solve the problems of low initial efficiency, low discharge capacity, and low capacity, and achieve less surface defects, clear particles, and thicker uniform effect

Inactive Publication Date: 2019-12-03
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the single crystal type ternary cathode material also has the following disadvantages, such as: (1) The capacity is low at the same voltage, because the sintering temperature of the single crystal type material is 20-30°C higher than that of the secondary ball material, The average particle size of the primary particle is about 2-3um; the average particle size of the secondary spherical primary particle is about 0.5-0.8um; therefore, the primary efficiency of the single crystal material will be significantly lower than that of the secondary spherical material, resulting i...

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  • Preparation method of large single crystal lithium ion battery nickel cobalt lithium manganate cathode material
  • Preparation method of large single crystal lithium ion battery nickel cobalt lithium manganate cathode material
  • Preparation method of large single crystal lithium ion battery nickel cobalt lithium manganate cathode material

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Embodiment 1

[0052] This embodiment provides a method for preparing a nickel cobalt lithium manganate positive electrode material for a large single crystal lithium ion battery, which includes the following steps:

[0053] First, set D50 to 3.7μm and BET to 4.3m 2 / g of small particle ternary precursor material Ni 0.60 Co 0.20 Mn 0.20 (OH) 2 , Lithium hydroxide powder and nano-zirconium fluoride are placed in a ball milling tank and mixed evenly by high-speed ball milling; among them, the molar ratio of lithium to precursor metal element is 1.06, and the mass fraction of zirconium element in the total material is 5000 ppmw;

[0054] Secondly, perform a sintering under the condition of high purity oxygen, the oxygen concentration is 85-99%, the sintering temperature is 940℃, the heating rate is 5℃ / min, the temperature is kept for 14h, and it is cooled to 60℃. Inlet pressure: 3MPa, jaw break, the gap between the rollers is 0.5mm, the airflow crushing frequency is 50Hz, the classification frequency...

Embodiment 2

[0058] This embodiment provides a method for preparing a nickel cobalt lithium manganate positive electrode material for a large single crystal lithium ion battery, which includes the following steps:

[0059] First, set D50 to 4.1μm and BET to 3.8m 2 / g of small particle ternary precursor material Ni 0.65 Co 0.15 Mn 0.20 (OH) 2 , Lithium hydroxide powder and nano-aluminum fluoride are placed in a ball mill tank and mixed evenly by high-speed ball milling; among them, the molar ratio of lithium to precursor metal element is 1.05, and the mass fraction of aluminum element in the total material is 3000 ppmw;

[0060] Secondly, perform a sintering under the condition of high purity oxygen. The oxygen concentration is 75-85%, the sintering temperature is 930℃, the heating rate is 8℃ / min, the temperature is kept for 14h, and it is cooled to 60℃. Inlet pressure: 2MPa, jaw crushing, the gap between the rollers is 0.3mm, the airflow crushing frequency is 30Hz, the classification frequency i...

Embodiment 3

[0064] This embodiment provides a method for preparing a nickel cobalt lithium manganate positive electrode material for a large single crystal lithium ion battery, which includes the following steps:

[0065] First, set D50 to 3.5μm and BET to 3.4m 2 / g of small particle ternary precursor material Ni 0.60 Co 0.10 Mn 0.30 (OH) 2 , Lithium hydroxide powder and nano-magnesium fluoride are placed in a ball milling tank and mixed uniformly by high-speed ball milling; among them, the molar ratio of lithium to precursor metal element is 1.04, and the mass fraction of magnesium element in the total material is 2000 ppmw;

[0066] Secondly, perform a sintering under high-purity oxygen conditions. The oxygen concentration is 65-75%, the temperature is 920℃, the temperature is kept for 14h, and the temperature is 920℃. The gap between the rollers is 0.2mm, the airflow crushing frequency is 25Hz, the classification frequency is 120Hz, and the sieving is carried out; finally, a sintered single ...

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Abstract

The invention relates to a preparation method of a single crystal lithium ion battery nickel cobalt lithium manganate cathode material. The method comprises the following steps of: (1) taking a small-grain crystal spherical NCM ternary precursor, a lithium salt and an A element-containing nano fluxing agent as raw materials, uniformly mixing the raw materials by adopting a dry-method high-speed mixing mode, and performing primary sintering under an oxygen-enriched atmosphere condition; (2) subjecting the sintered material to jaw breaking, roller pairing, crushing and sieving so as to obtain asingle-crystal once-sintered base material; and (3) mixing the primary sintering base material with a B element-containing nano coating agent, sintering again under an oxygen-enriched atmosphere condition, and then performing jaw breaking, roller pairing, crushing and sieving to obtain the large single crystal lithium nickel cobalt manganate cathode material. The cathode material prepared by the invention has the characteristics of the large particle size, the good dispersity, the moderate specific surface area, the high compaction density, the high voltage, the good high-temperature cycle performance and the like.

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 large single crystal lithium ion battery nickel cobalt lithium manganate anode material. Background technique [0002] Since 2013, domestic new energy vehicle subsidies have maintained an overall downward trend; in 2018, financial subsidies for vehicles with a driving range of less than 150km will be suspended, while subsidies for vehicles with a high driving range will increase. This is a major part of the new subsidy policy in 2018. Features; however, in 2019, financial subsidies for vehicles with a driving range of less than 250km will cease to be issued, and the subsidy for models with a high driving range will decline rapidly on the basis of 2018. [0003] In 2019, the subsidy declined sharply, leading the market to put forward higher requirements for new energy vehicle power batteries, such as: high safety, high ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 方明毛秦钟胡子俊施翼杰戚思炀张中彩吉同棕王寅峰钱志挺吴海军
Owner ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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