NCMA quaternary system material and preparation method thereof, lithium battery positive electrode material and lithium battery

A cathode material and quaternary system technology, applied in the field of lithium battery cathode materials and lithium batteries, can solve the problem of low electrochemical performance

Inactive Publication Date: 2020-09-08
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a kind of NCMA quaternary system material and preparation method thereof, lithium battery positive electrode material and lithium battery, to solve the problem that the electrochemical performance of the high-nickel quaternary positive electrode material in the prior art is lower

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  • NCMA quaternary system material and preparation method thereof, lithium battery positive electrode material and lithium battery
  • NCMA quaternary system material and preparation method thereof, lithium battery positive electrode material and lithium battery
  • NCMA quaternary system material and preparation method thereof, lithium battery positive electrode material and lithium battery

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preparation example Construction

[0029] In another typical implementation of the present application, a preparation method of NCMA quaternary material is provided, the preparation method includes: step S1, using Co 3 o 4 and V 2 o 5 Attaching the NCMA quaternary cathode material to obtain the attached material; and step S2, performing a second firing on the attached material to obtain the NCMA quaternary system material.

[0030] Co 3 o 4 and V 2 o 5 coated on the NCMA quaternary cathode material to obtain Co 3 o 4 and V 2 o 5 Co-coated NCMA quaternary materials. coated Co 3 o 4 The main purpose is to remove the residual alkali (LiOH and LiOH) on the surface of the NCMA quaternary cathode material through chemical reaction. 2 CO 3 ), thereby reducing the pH value of the material, and then will not cause the gelation of the positive electrode slurry during the subsequent homogenate coating process in battery preparation, which increases the transmission channel of lithium ions from the aspect of ...

Embodiment 1

[0043] Nickel-cobalt-manganese-aluminum four-element composite hydroxide (Henan Kelong New Energy Co., Ltd., molar ratio: Ni:Co:Mn:Al=88:6:3:3) and LiOH according to the molar ratio of 1:1.025 (Li / Metal=1.025) Stir and mix directly in the mixer to get the mixture, roast the mixture in an ordinary box furnace at 700°C under an oxygen atmosphere for 8 hours, cool, pulverize and sieve to obtain NCMA quaternary with a particle size of 12 μm Cathode material, the chemical formula of the NCMA quaternary cathode material is LiNi 0.88 co 0.06 mn 0.03 al 0.03 .

[0044] The NCMA quaternary cathode material, Co 3 o 4 and V 2 o 5 According to the mass ratio of 1:0.005:0.005 for dry mixing, Co 3 o 4 and V 2 o 5 The powder is evenly attached to the surface of the NCMA quaternary cathode material to obtain the attached material. The adhered material was calcined in an oxygen atmosphere at 500°C for 8 hours, then cooled, crushed, and sieved to obtain the NCMA quaternary material...

Embodiment 2

[0046]The difference between embodiment 2 and embodiment 1 is that

[0047] The NCMA quaternary cathode material, Co 3 o 4 and V 2 o 5 Stir and mix directly according to the mass ratio of 1:0.001:0.001, and finally obtain the NCMA quaternary system material. The thickness of the cladding layer of the NCMA quaternary system material is 1nm, Co 3 o 4 The mass ratio to NCMA quaternary cathode material is 0.001:1, V 2 o 5 The mass ratio of the NCMA quaternary cathode material is 0.001:1, and the chemical formula of the NCMA quaternary system material is LiNi 0.88 co 0.06 mn 0.03 al 0.03 o 2 .

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Abstract

The invention provides an NCMA quaternary system material and a preparation method thereof, a lithium battery positive electrode material and a lithium battery. The NCMA quaternary system material comprises an NCMA quaternary positive electrode material and a coating layer, wherein the coating layer comprises Co3O4 and V2O5. The co-coating layer of Co3O4 and V2O5 not only can solve the problem ofresidual alkali on the surface of the material, but also can inhibit the dissolution of transition metal in the NCMA quaternary positive electrode material. Through the mutual synergistic effect of Co3O4 and V2O5, the charge transmission rate of the material body and the ion transmission rate between the material and the electrolyte are further improved, so that intercalation and deintercalation of lithium ions are promoted, side reactions of residual lithium and the surface of the NCMA quaternary positive electrode material are reduced, and the electrochemical properties such as capacity andstability of the NCMA quaternary positive electrode material are further improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an NCMA quaternary material and a preparation method thereof, a lithium battery cathode material and a lithium battery. Background technique [0002] The world is undergoing an electrification revolution, which is reflected in various industries such as mobile electronics, transportation and energy storage. In order to support the progress of the electrification revolution, the development of batteries with better performance is the goal of the joint efforts of scientists all over the world. Lithium-ion batteries have become the most widely used electrochemical power source at present. The most representative of this kind of battery is the lithium secondary battery that generates electric energy due to the change of chemical potential of lithium ions in the positive and negative electrodes when intercalation and deintercalation. (LIBs). Cathode materials have a direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525C01G53/00C01G51/04C01G31/02B82Y30/00
CPCB82Y30/00C01G31/02C01G51/04C01G53/50C01P2004/61C01P2004/64C01P2004/80C01P2006/40H01M4/366H01M4/485H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 王壮张树涛潘海龙白艳
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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