Garnet-type ion conductor-coated high-nickel ternary positive electrode material, preparation method and lithium ion battery obtained by preparation

A lithium-ion battery and garnet-type technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as uneven coating of pole pieces, gelation of slurry, and increase in pH value, and achieve an increase in magnification Performance and cycle performance, low cost, effect of reducing internal resistance and polarization

Inactive Publication Date: 2019-06-18
ZOTYE INT AUTOMOBILE TRADING CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the addition of excessive lithium salt in the preparation process of high-nickel materials will lead to the appearance of residual lithium in the product. Excessive residual lithium will increase the pH value of the slurry during the electrode preparation process, resulting in gelation of the slurry. This in turn leads to uneven coating of the pole piece

Method used

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  • Garnet-type ion conductor-coated high-nickel ternary positive electrode material, preparation method and lithium ion battery obtained by preparation
  • Garnet-type ion conductor-coated high-nickel ternary positive electrode material, preparation method and lithium ion battery obtained by preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A method for preparing a high-nickel ternary positive electrode material coated with a garnet-type ion conductor, comprising the following steps:

[0039] (1) Synthesis of nickel cobalt manganese hydroxide precursor;

[0040](1-1) Dissolve nickel nitrate, cobalt nitrate and manganese nitrate in deionized water according to the stoichiometric ratio of 8:1:1 to obtain salt solution I; the total concentration of metal salts in the salt solution I is 2.0mol / L . (1-2) Dissolving KOH powder in deionized water to obtain precipitant solution II; the concentration of KOH in the precipitant solution II is 6.0 mol / L.

[0041] (1-3) Mix ammonia water and deionized water to obtain complexing agent solution III; the concentration of ammonia water in the complexing agent solution III is 2.0 mol / L.

[0042] (1-4) Inject the salt solution I, the precipitant solution II and the complexing agent solution III into the reaction kettle at the same speed and mix them, and feed nitrogen into...

Embodiment 2

[0051] A method for preparing a high-nickel ternary positive electrode material coated with a garnet-type ion conductor, comprising the following steps:

[0052] (1) Synthetic nickel cobalt manganese hydroxide precursor, method is the same as embodiment 1, difference is nickel nitrate, cobalt nitrate and manganese nitrate stoichiometric ratio is 8.5:1:0.5;

[0053] (2) the nickel-cobalt-manganese hydroxide precursor that step (1) obtains is mixed with lithium hydroxide powder, LiCl powder, and the mol ratio of nickel-cobalt-manganese hydroxide precursor and lithium hydroxide powder, LiCl powder is 1: 1.05:0.02, mixed by high-speed ball milling for 5 hours, and then calcined the mixture at 800°C for 15 hours in an oxygen atmosphere to obtain a Cl-doped high-nickel ternary cathode material;

[0054] (3) Lithium hydroxide monohydrate powder, lanthanum nitrate hexahydrate powder, and niobium oxide powder with a stoichiometric ratio of 5:3:2 were ball milled and mixed for 4 hours, ...

Embodiment 3

[0058] A method for preparing a high-nickel ternary positive electrode material coated with a garnet-type ion conductor, comprising the following steps:

[0059] (1) Synthesize nickel cobalt manganese hydroxide precursor according to the same method as in Example 1;

[0060] (2) Mix the nickel-cobalt-manganese hydroxide precursor obtained in step (1) with lithium hydroxide powder and LiBr powder. The molar ratio of positive electrode material to lithium hydroxide powder and LiBr powder is 1:1.08:0.04, and high-speed ball milling Mixing for 5 hours, and then calcining the mixture at 850°C for 15 hours in an oxygen atmosphere to obtain a Br-doped high-nickel ternary positive electrode material;

[0061] (3) Lithium carbonate powder, lanthanum hydroxide powder, zirconium oxide powder and tantalum pentachloride ball mill with a stoichiometric ratio of 6.75:3:1.75:0.25 were mixed for 4 hours, and then the mixture was sintered at 900°C for 12 hours to obtain The product was milled ...

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Abstract

The invention discloses a garnet-type ion conductor-coated high-nickel ternary positive electrode material, a preparation method and a lithium ion battery obtained by preparation. A matrix of the garnet-type ion conductor-coated high-nickel ternary positive electrode material is LiNi<1-x-y>Co<x>Mn<y>O<2-z>Ha<z>, wherein x is more than 0 but less than or equal to 0.15, y is more than 0 but less than or equal to .15, z is more than 0 or less than or equal to 0.04, Ha is one or more of F, Cl, Br, the chemical formula of a garnet-type ion conductor is one or more of Li<7-a>La<3>Zr<2-a>MaO<12>, Li5La3M2O12, Li<5.5>La<3>M<1.75>A<0.25>O<12>, Li6DLa2M2O12, Li<7.06>M<3>Y<0.06>Zr<1.94>O<12> and Li<7.06>La<3>Y<0.06>Zr<1.94>O<12>, M is Nb or Ta, A is In or Zr, D is Ca, Sr or Ba, and a is more than orequal to 0 but less than or equal to 1. By direct mixing and coating of a garnet-type coating agent and the ternary material, a sintering temperature is lower than 700 DEG C, the damage to a crystal structure of the ternary lithium nickel-cobalt manganate material is prevented, and the rate performance and the cycle performance of a lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a high-nickel ternary positive electrode material coated with garnet-type ion conductors, a preparation method, and a lithium-ion battery prepared by the same. Background technique [0002] After decades of rapid development, the main challenge for lithium-ion batteries is the improvement of electrode materials, electrolytes, and separators. layered material LiNi 1-x-y co x mn y o 2 and the earliest commercialized LiCoO 2 There are similar structures, but the former has lower cost, higher specific capacity and better environmental compatibility, so it is widely used in electronic equipment, energy storage and power battery fields. [0003] However, when the percentage of nickel is higher than 0.6, LiNi 1-x-y co x mn y o 2 During the synthesis process, the metal elements are rearranged, that is, lithium ions enter the transition metal (Ni 2+ Mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCY02E60/10
Inventor 金源夏妍郭永斌牛丽媛王康彦柳晓燕
Owner ZOTYE INT AUTOMOBILE TRADING CO LTD
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