Lithium nickel cobalt manganese aluminate positive electrode material with shell-core-shell structure and preparation method of lithium nickel cobalt manganese aluminate positive electrode material

A technology of nickel-cobalt-manganese-aluminate lithium and core-shell structure, which is applied in the field of nickel-cobalt manganese-aluminate lithium anode material and its preparation, can solve the problem of no improvement in the thermal stability and safety performance of high-nickel ternary secondary particle anode materials , The internal layer structure deteriorates preferentially, and it is difficult to enter the secondary particles, etc., to achieve the effect of improving cycle stability, improving cycle performance, and improving particle crushing

Active Publication Date: 2022-01-21
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with secondary particles with a hollow structure is that when the secondary particles are to be coated when making positive electrode materials, the coating layer only exists on the surface of the secondary particles, and it is difficult to enter the interior of the secondary particles, forming a uniform particle in the hollow area. Cladding, even wet cladding faces this problem
The particle cracks formed by the secondary particles of the hollow structure during the long cycle provide a channel for the electrolyte to infiltrate into the hollow area inside the particle (the secondary particles have partic

Method used

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  • Lithium nickel cobalt manganese aluminate positive electrode material with shell-core-shell structure and preparation method of lithium nickel cobalt manganese aluminate positive electrode material
  • Lithium nickel cobalt manganese aluminate positive electrode material with shell-core-shell structure and preparation method of lithium nickel cobalt manganese aluminate positive electrode material
  • Lithium nickel cobalt manganese aluminate positive electrode material with shell-core-shell structure and preparation method of lithium nickel cobalt manganese aluminate positive electrode material

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Effect test

Embodiment 1

[0031] 1. The lithium-cobalt-manganese-aluminate positive electrode material of a core-shell structure 1.01 CoO 2 @Li 1.02 Ni 0.828 co 0.08 mn 0.0 7 al 0.02 Zr 0.002 o 2 @LiBO 2 The preparation method comprises the following steps:

[0032] Step 1, configure 0.05mol / L Co(NO 3 ) 2 ·6H 2 O alcohol solution, then quickly add 0.40mol / L 2-methylimidazolium alcohol solution to the above solution, and stir for 30 minutes. After standing and aging at room temperature for 24 hours, the obtained purple product was precipitated and centrifuged, washed with anhydrous methanol for several times, and dried in an oven at 60° C. to obtain the zif-67 polyhedral material. The morphology of zif-67 was tested with a field emission scanning electron microscope, and the test results are shown in figure 1 .

[0033] Step 2, the molar ratio of nickel, cobalt, manganese, and aluminum is 83:8:7:2, and the concentration is 2.0mol / L mixed salt solution, 8mol / L sodium hydroxide solution, an...

Embodiment 2

[0052]1. A lithium-cobalt-manganese-aluminate positive electrode material with a shell-core-shell sandwich hollow structure 1.01 CoO 2 @Li 1.02 Ni 0.86 8 co 0.08 mn 0.03 Al 0.02 Zr 0.002 o 2 @LiAlO 2 The preparation method comprises the following steps:

[0053] Step 1, configure 0.05mol / L Co(NO 3 ) 2 ·6H 2 O alcohol solution, then quickly add 0.25mol / L 2-methylimidazolium alcohol solution to the above solution, and stir for 30 minutes. After standing and aging at room temperature for 24 hours, the obtained purple product was precipitated and centrifuged, washed with anhydrous methanol for several times, and dried in an oven at 60° C. to obtain the zif-67 polyhedral material.

[0054] Step 2, the molar ratio of nickel, cobalt, manganese, and aluminum is 87:8:3:2, and the concentration is 2.0mol / L mixed salt solution, 8mol / L sodium hydroxide solution, and 10mol / L ammonia solution.

[0055] Step 3: Turn on the stirring device of the reactor, and pump the sodium hyd...

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Abstract

The invention discloses a lithium nickel cobalt manganese aluminate positive electrode material with a shell-core-shell structure and a preparation method of the lithium nickel cobalt manganese aluminate positive electrode material. The preparation method comprises the steps of taking Co-based MOF (zif-67) as a crystal nucleus for nickel, cobalt, manganese and aluminum coprecipitation reaction, generating a high-nickel quaternary component precursor with a core-shell structure, evenly mixing the precursor, lithium salt and an additive according to a certain proportion, calcining in an oxygen atmosphere furnace, and obtaining a primary sintered matrix; crushing, washing, filter-pressing and dehydrating the primary sintered matrix to obtain a filter cake containing certain moisture, uniformly mixing the filter cake and a coating material, drying at a low temperature, and carrying out secondary sintering in an oxygen atmosphere furnace to obtain the high-nickel quaternary component positive electrode material with a 'shell-core-shell' sandwich hollow structure. The positive electrode material not only has relatively high initial discharge specific capacity, relatively low internal resistance and relatively good rate capability, but also has good cycling stability and safety performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a nickel-cobalt-manganese-aluminate positive electrode material with a core-shell structure and a preparation method thereof. Background technique [0002] As an energy-saving and environmentally friendly energy source, lithium-ion batteries have the characteristics of high energy density, long cycle life, and good safety. They have become the main choice for mobile electronic devices and new energy vehicles. With the increasing demand of consumers and the continuous change of lithium-ion battery technology, lithium-ion batteries are currently developing in the direction of higher specific energy, higher power, longer life and higher safety performance. [0003] Cathode materials are one of the key factors determining the performance of lithium-ion batteries. Among them, nickel-cobalt lithium manganese oxide and nickel-cobalt lithium aluminate ternary cathode materi...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01B35/12H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/50C01G51/42C01B35/121H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021C01P2004/80C01P2004/03C01P2006/40Y02E60/10
Inventor 赵阳阳栗晓静程迪徐云军闫锐陈丹凤
Owner HENAN KELONG NEW ENERGY CO LTD
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