Cobalt-free lithium-rich ternary anode material NMA and preparation method thereof

A cathode material, lithium-rich technology, applied in the field of lithium-ion battery material preparation, can solve the problems of hindering Li ion extraction and intercalation activity, reducing the cycle stability of cathode materials, capacity and cycle stability, etc., to reduce heavy metal ion pollution , Improve capacity and stability, the effect of small density

Inactive Publication Date: 2019-04-26
SICHUAN UNION SHINE MECHANICAL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for the nickel-based cathode material NCA, rich lithium can only be attached to the surface of the material as lithium oxide, and cannot enter the crystal structure of the material, so not only can it not increase its capacity, but it will increase the alkalinity of the material, and instead reduce the cycle of the cathode material. Stability, this is because in the positive electrode material NCA Li + Excessive content (that is, lithium-rich), contact with air will generate lithium carbonate and lithium hydroxide, which greatly hinders the extraction and intercalation activity of Li ions, reducing its capacity and cycle stability

Method used

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  • Cobalt-free lithium-rich ternary anode material NMA and preparation method thereof
  • Cobalt-free lithium-rich ternary anode material NMA and preparation method thereof
  • Cobalt-free lithium-rich ternary anode material NMA and preparation method thereof

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preparation example Construction

[0037] A method for preparing cobalt-free lithium-rich ternary positive electrode material NMA as claimed in claim 1, comprising the steps of:

[0038] 1) The soluble nickel salt, manganese salt, aluminum salt, cerium salt, titanium salt, zirconium salt, magnesium salt, the corresponding stoichiometry of the required components determined according to the precursor chemical formula of the cobalt-free lithium-rich ternary positive electrode material NMA Proportional mixing; adding deionized water to obtain a metal salt solution; that is, according to the chemical formula of the cobalt-free lithium-rich ternary cathode material NMA is Li 1+P Ni 1-x-y-z mn x al y m z o 2 , the chemical formula of the precursor is Ni 1-x-y-z mn x al y m z (OH) 2 , where: 0.033+ 、Ti 4+ 、Zr 4+ , Mg 2+ One or more than two kinds of specific target precursors that need to be produced and prepared are selected, and the specific values ​​of X, Y, and Z are determined. Ce 3+ 、Ti 4+ 、Zr 4+ ...

Embodiment 1

[0053] Take 462.6g of battery-grade nickel sulfate hexahydrate, 30.4g of battery-grade manganese sulfate monohydrate, 20g of battery-grade aluminum sulfate octadecahydrate, 1.1g of analytically pure zirconium sulfate, add deionized water, and prepare a 1L solution, which is converted into nickel sulfate , manganese sulfate, aluminum sulfate mixed aqueous solution, the total metal ion concentration is 2mol / l, this is solution A; get analytically pure sodium hydroxide 161.6g, add deionized water, be mixed with the solution of 1L, convert to the concentration of sodium hydroxide is 4mol / l, this is solution B. Use 3L reactor to get bottom water (deionized water) 450ml, A, B solution are pumped into 3L reactor simultaneously and carry out co-precipitation reaction, reaction conditions are: Stirring intensity: Medium, feed time 30min, reaction time 2h, aging The reaction time is 60min, and the reaction temperature is 60°C. Vacuum filter while hot, take out the filter cake, add 1L o...

Embodiment 2

[0055] Take 461.6g of battery-grade nickel sulfate hexahydrate, 30.1g of battery-grade manganese sulfate monohydrate, 20g of battery-grade aluminum sulfate octadecahydrate, 0.7g of analytically pure zirconium sulfate, 1.0g of analytically pure titanium sulfate, add deionized water, and prepare 1L The solution, converted to the total metal ion concentration in the mixed aqueous solution of nickel sulfate, manganese sulfate, aluminum sulfate, and zirconium sulfate, is 2mol / l, which is solution A; take 161.6g of analytically pure sodium hydroxide, add deionized water, and prepare 1L solution, converted to a sodium hydroxide concentration of 4mol / l, this is solution B. The solutions A and B are simultaneously pumped into a 3L reactor for co-precipitation reaction. The reaction conditions are: stirring intensity: medium, feeding time 30min, reaction time 2h, aging time 60min, reaction temperature 60°C. Vacuum filter while hot, take out the filter cake, add 1L of deionized water, st...

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Abstract

The invention discloses a cobalt-free lithium-rich ternary anode material NMA and a preparation method thereof. The chemical formula of the material is Li1 + PNi1-x-y-zMnxAlyMzO2, wherein: 0.03 < P <0.3, 0.1 < X <0.6, 0.01 < Y <0.1, 0.01 < Z <0.3, M is one or more of Ce <3+>, Ti <4+>, Zr <4+> and Mg <2+>; the precursor of the material is nano sheet-shaped agglomerated particles, and the thicknessof the nano sheet-shaped precursor is 30-50 nanometers. The material has the main application and advantages that the lithium-rich layered NMA cathode material is prepared by combining layered LiNiO2phase with layered LiMnO2 phase by replacing expensive Co with cheap Mn and adding excessive lithium (rich lithium). Since cobalt is not contained, the preparation cost is reduced by 20-30%, the capacity of the anode material reaches 190-200 mAh / g, and the capacity retention rate of 100 cycles is kept to 90-95%.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion battery materials, in particular to a cobalt-free lithium-rich ternary positive electrode material NMA and a preparation method thereof. Background technique [0002] With the rapid development of new energy, high-capacity lithium-ion power batteries have become a hot spot in the development of global new energy production and technology. As the cathode material that affects the key part of lithium battery capacity, it is the focus of current technical research. The ternary cathode material NCA has the advantages of large capacity and high voltage platform. It is a new generation of high-capacity cathode material after the ternary cathode material NCM. It is the current A new hotspot in the research and development of lithium batteries. With the advancement of technology, on the premise of maintaining high stability, increasing the content of nickel in ternary cathode materials (NCA, NCM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 赵春阳付烨钟辉
Owner SICHUAN UNION SHINE MECHANICAL EQUIP CO LTD
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