Preparation method of single-crystal lithium nickel manganese aluminate positive electrode material

A technology of nickel-manganese-aluminate and cathode materials, which is applied in the field of preparation of nickel-manganese lithium-aluminate cathode materials for single-crystal high-nickel cobalt-free lithium ion batteries, can solve the problem that cobalt is expensive, unfavorable for large-scale use and lack of resources. and other problems, to achieve the effect of improving safety and cycle performance, low cost and reducing cost

Inactive Publication Date: 2020-12-08
浙江格派钴业新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main role of cobalt in ternary cathode materials is to improve crystal conductivity and stabilize the structure, but cobalt is expensive and scarce in resources, which is not conducive to large-scale use

Method used

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  • Preparation method of single-crystal lithium nickel manganese aluminate positive electrode material
  • Preparation method of single-crystal lithium nickel manganese aluminate positive electrode material
  • Preparation method of single-crystal lithium nickel manganese aluminate positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0080] figure 2 Microscopic topography of the single crystal lithium nickel manganese aluminate cathode material in Example 1 of the present invention (Example 1);

[0081] image 3 XRD diffractograms of the single crystal lithium nickel manganese aluminate cathode materials of Examples 1-4 of the present invention. Detailed ways

specific Embodiment approach

[0082] Example 1

[0083] According to the nickel ion:manganese ion:aluminum ion molar ratio of 0.85:0.1:0.05 solution, the total concentration of metal ions is 1.6mol / L; the concentration of NaOH solution: 5mol / L; the concentration of ammonia solution: 5mol / L; The three solutions were introduced into the reactor at the same time at 30L / h, 20L / h and 2L / h respectively, the pH value was controlled to be 11.2±0.2, the temperature was 50°C, and the reaction was continued for 48h. After aging, centrifugation, washing and drying respectively , to obtain the precursor material Ni with D50 of 3.4um 0.85 Mn 0.1 Al 0.05 (OH) 2 .

[0084] The D50 prepared above is 3.4um small particle ternary precursor material Ni 0.85 Mn 0.1 Al 0.05 (OH) 2 Lithium hydroxide powder and nano-zirconia were placed in a ball-milling jar, subjected to high-speed ball milling for 2 hours, and mixed uniformly; among them, the molar ratio of lithium: precursor metal element was 1.04, and the amount of zi...

Embodiment 2

[0087] The one-sintered single crystal matrix material LiNi after washing and drying in Example 1 0.85 Mn 0.1 Al 0.05 O 2 , mixed with nano-scale cobalt oxide, the amount of cobalt added in the total material is 2000ppmw, and then at V O2 : V CO2 = 1:1 atmosphere condition, carry out secondary sintering, the temperature is 500 ° C, the temperature is 500 ° C, the temperature is kept for 10 h, and the sieve is 400 mesh to obtain the single crystal positive electrode material LiNi 0.85 Mn 0.1 Al 0.05 O 2 ; Its important physical and chemical indicators are shown in Table 1 below.

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Abstract

The invention relates to the field of lithium ion battery positive electrode materials, in particular to a preparation method of a high-capacity ternary material and application of the high-capacity ternary material in a lithium ion battery positive electrode material. The method comprises the following steps: (1) preparing precursor mixed raw stock; (2) preparing a precursor; (3) preparing precursor and lithium source mixed slurry; (4) preparing a ternary material; the ternary material prepared by the method is narrow in particle size distribution, uniform in particle morphology, high in energy density and excellent in electrochemical performance. Compared with the prior art, the material has the advantages that no organic solvent is used, and the influence of the pH value is avoided;andthe operation method has the advantages of simplicity, feasibility, environmental friendliness, low production cost, high yield, excellent electrochemical 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 positive electrode material of nickel manganese lithium aluminate for single crystal high nickel and cobalt free lithium ion batteries. Background technique [0002] At present, my country's power battery industry is showing a good momentum of vigorous development. Power battery technology is also innovating in this process, and the research and development system of new battery materials is becoming more and more perfect. Especially from the analysis of the cathode material system, two mainstream power batteries for new energy vehicles are used. The positive electrode materials are ternary nickel cobalt lithium manganate and lithium iron phosphate. The energy density of the former is significantly higher than that of the latter, which is in line with the development direction of improving energy density. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/50C01P2002/72C01P2004/01C01P2006/40H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 方明曹栋强龚丽锋郝培栋曹天福王辉邓明
Owner 浙江格派钴业新材料有限公司
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