A method for preparing a lithium-rich layered cathode material with high cycle capacity and voltage fading resistance

A technology for positive electrode materials and cycle capacity, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of capacity and voltage decline, anti-voltage decline lithium-rich layered positive electrode materials, etc., to improve voltage decline and increase solid-phase Li+ The effect of transmission ability and simple synthesis process

Active Publication Date: 2019-01-04
NANKAI UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing lithium-rich layered positive electrode material has obvious capacity and voltage decline in the process of charging and discharging, and to provide a preparation method of a lithium-rich layered positive electrode material with high cycle capacity and resistance to voltage decline

Method used

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  • A method for preparing a lithium-rich layered cathode material with high cycle capacity and voltage fading resistance
  • A method for preparing a lithium-rich layered cathode material with high cycle capacity and voltage fading resistance
  • A method for preparing a lithium-rich layered cathode material with high cycle capacity and voltage fading resistance

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preparation example Construction

[0029] (1) Preparation of precursor:

[0030] (1-1) Ni salt (NiSO 4 , Ni(NO 3 ) 2 , NiCl 2 , Ni(CH 3 COO) 2 ), Co salt (CoSO 4 , Co(NO 3 ) 2 , CoCl 2 , Co(CH 3 COO) 2 ), Mn salt (MnSO 4 , Mn(NO 3 ) 2 , MnCl 2 , Mn(CH 3 COO) 2 ) dissolved in water, wherein 0≤x≤1, 0≤y≤1, 0≤x+y≤1, so that the total molar concentration of metal ions is ≥1mol / L, and it is ready for use.

[0031] (1-2) Precipitating agent solution: the precipitating agent can be water-soluble oxalate, carbonate, or hydroxide, and the precipitating agent is dissolved in water to make the molar concentration ≥ 1 mol / L for later use.

[0032] (1-3) Configure pH adjuster solution: One or more of ammonia water, sodium hydroxide, sodium carbonate, sodium bicarbonate, ammonium chloride, ammonium carbonate, and ammonium bicarbonate can be used to prepare a pH of 8-12 The pH adjuster solution is ready for use.

[0033] (1-4) Adding the precipitating agent solution into the reactor containing the metal ion ...

Embodiment 1

[0045] (1) According to the molar ratio of 0.163:0.163:0.674 NiSO 4 、CoSO 4 , MnSO 4 Dissolve in water so that the total molar concentration of metal ions is 1mol / L, and set aside. Prepare the precipitant solution: the precipitant is sodium carbonate, dissolve the precipitant in water so that the molar concentration is 1mol / L, and set aside. Prepare the pH regulator solution: use ammonia water and sodium carbonate to prepare a pH regulator solution with a pH of 11, and set aside. Add the precipitant solution into the reaction kettle containing the mixed solution of metal ions. During the reaction, add a pH regulator solution to adjust the pH to 10.5, and stir at the same time. After the reaction is complete, the precipitate produced is centrifuged, washed with deionized water and ethanol, and dried in a blast oven to obtain Precursor, the molecular formula of the precursor is: Ni 0.163 co 0.163 mn 0.674 CO 3 ;

[0046] (2) According to the precursor Ni 0.163 co 0.16...

Embodiment 2

[0052] (1) According to the molar ratio of 0.25:0.75, NiSO 4 , MnSO 4 Dissolve in water (at this time, the value of y in the Co salt is 0, the same below), so that the total molar concentration of metal ions is 2mol / L, and set aside. Prepare the precipitant solution: precipitant oxalic acid, dissolve the precipitant in water to make the molar concentration 2mol / L, set aside. Add the precipitant solution into the reaction kettle containing the mixed solution of metal ions, and stir at the same time. After the reaction is complete, centrifuge the generated precipitate, wash the precipitate with deionized water and ethanol, and place the precipitate in a blast oven Dried to obtain the precursor, the molecular formula of the precursor is: Ni 0.25 mn 0.75 C 2 o 4 2H 2 O;

[0053] (2) According to the precursor Ni 0.25 mn 0.75 C 2 o 4 2H 2 O: The molar ratio of the metal element Ni+Mn that needs to be added during calcination (the source of Ni is nickel acetate, and the ...

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Abstract

The invention relates to a preparation method of a lithium ion battery high-cycle capacity voltage fading-resistant lithium-rich layered cathode material, belonging to the technical field of new energy sources. As that method of the invention utilize only the high-abundance elements of the earth, From the viewpoint of its intrinsic structure, transition metal ion Ni occupation in Li-rich layered cathode material was controlled by calcination, so that one part occupied 2c site and 4h site in the C2 / m phase of Li-rich layered cathode material, and one part occupied in the R. 3m phase, so as to improve the voltage decline and capacity decline of the Li-rich layered cathode material in the charge and discharge process, and improve the lithium ion transport capacity of the Li-rich layered cathode material itself. The method of the invention is a coprecipitation solid-state sintering method, which has the advantages of simple synthesis process, high production efficiency and the like, and issuitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of lithium-rich layered positive electrode material with high cycle capacity and anti-voltage decline of lithium ion battery, which belongs to the technical field of new energy. Background technique [0002] At present, lithium-ion batteries have firmly occupied the market of 3C electronic products and electric vehicles, but with the rapid development of 3C electronic products and the rapid rise of new energy electric vehicles, the current rate of improvement in energy density and power density of lithium-ion batteries It can no longer meet the development requirements of 3C electronic products and new energy electric vehicles. The restrictive factor that limits the rapid increase in the energy density of lithium-ion batteries is that the traditional cathode materials are close to the theoretical limit. Countries are actively developing high-nickel ternary layered cathode materials and lithium-rich layered...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/582H01M10/0525Y02E60/10
Inventor 陈军张继成程方益严振华李海霞
Owner NANKAI UNIV
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