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Preparation method and application of high-nickel layered positive electrode material

A positive electrode material and layered technology, applied in the field of high-nickel layered positive electrode materials and its preparation, can solve the problems of weak corrosion, large fluctuations in lithium content, strong corrosion, etc., and achieve low layered structure, low lithium-nickel mixed Discharge degree, high activity effect

Inactive Publication Date: 2017-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although lithium hydroxide monohydrate is superior to lithium carbonate in terms of reactivity and reaction temperature, since the lithium content of lithium hydroxide monohydrate fluctuates more than lithium carbonate, and lithium hydroxide is more corrosive than lithium carbonate, if there is no special However, the ternary materials all use lithium carbonate with stable content and weak corrosion

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  • Preparation method and application of high-nickel layered positive electrode material
  • Preparation method and application of high-nickel layered positive electrode material
  • Preparation method and application of high-nickel layered positive electrode material

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Embodiment 1

[0043] The preparation method of the high-nickel layered positive electrode material of the present embodiment comprises the following steps:

[0044] (1) NiCl 2 、CoCl 2 and MnCl 2 Prepare a solution with a total metal ion concentration of 0.5mol / L according to the ratio (molar ratio) of 8:1:1;

[0045] (2) The solution prepared in step (1) was subjected to spray pyrolysis after ultrasonic atomization. Gas is O 2 , the carrier gas flow rate is 6L / min, to get Ni 0.8 co 0.1 mn 0.1 o 1.1 Nickel-based oxide precursor;

[0046] (3) Ni obtained by step (2) 0.8 co 0.1 mn 0.1 o 1.1 The nickel-based oxide precursor and lithium carbonate were mixed and ground at a molar ratio of 1:1.05, and then sintered at 780°C for 15 hours to obtain the high-nickel layered cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 .

[0047] For the nickel-based oxide precursor Ni of the present embodiment 0.8 co 0.1 mn 0.1 o x The phase and morphology of the samples were examined.

[0048] f...

Embodiment 2

[0052] The preparation method of the high-nickel layered positive electrode material of the present embodiment comprises the following steps:

[0053] (1) NiCl 2 、CoCl 2 and MnCl 2 Prepare a solution with a total metal ion concentration of 0.5mol / L according to the ratio (molar ratio) of 34:3:3;

[0054] (2) The solution prepared in step (1) was subjected to spray pyrolysis after ultrasonic atomization. Gas is O 2 , the carrier gas flow rate is 2L / min, and the nickel-based oxide precursor Ni 0.85 co 0.075 mn 0.075 o 1.08 ;

[0055] (3) Ni obtained by step (2) 0.85 co 0.075 mn 0.075 o 1.08 The nickel-based oxide precursor and lithium carbonate were mixed and ground at a molar ratio of 1:1.1, and then sintered at 780 °C for 15 hours to obtain the high-nickel layered cathode material LiNi 0.85 co 0.075 mn 0.075 o 2 .

[0056] The phase and morphology of the nickel-based oxide precursor in this embodiment were detected.

[0057] Figure 8 for Ni 0.85 co 0.075 ...

Embodiment 3

[0061] The preparation method of the high-nickel layered positive electrode material of the present embodiment comprises the following steps:

[0062] (1) NiCl 2 , CoCl 2 and AlCl 3 According to the ratio (molar ratio) of 8:1.5:0.5, a solution with a total metal ion concentration of 0.5mol / L was prepared;

[0063] (2) The solution prepared in step (1) was subjected to spray pyrolysis after ultrasonic atomization. Gas is O 2 , the carrier gas flow rate is 6L / min, and the nickel-based oxide precursor Ni 0.8 co 0.15 Al 0.05 o 1.12 ;

[0064] (3) the nickel-based oxide precursor Ni obtained in step (2) 0.8 co 0.15 Al 0.05 o 1.12 After mixing and grinding with lithium carbonate at a molar ratio of 1:1.1, sintering at 780°C for 15 hours to obtain the high-nickel layered cathode material LiNi 0.8 co 0.15 Al 0.05 o 2 .

[0065] For the nickel-based oxide precursor Ni of the present embodiment 0.8 co 0.15 Al 0.05 o 1.12 The phase and morphology of the samples were ...

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Abstract

The invention discloses a preparation method of a high-nickel layered positive electrode material. The preparation method comprises the following steps of (1) preparing a metal chloride salt solution according to a stoichiometric ratio of a target high-nickel layered positive electrode material product, wherein the metal chloride salt solution is NiCoM<c>Cl<2>, M is Mn or Al, a>=0.8, 0.2>=b>=0, 0.2>=c>=0, and (a+b+c) is equal to 1: (2) performing spray pyrolysis under a condition of 650-950 DEG C to obtain a nickel-based oxide precursor by taking O2 as a carrier gas after ultrasonic atomization is performed on the metal chloride salt solution, wherein the reaction time of the spray pyrolysis is 5-30 seconds; and (3) performing sintering to obtain the high-nickel layered positive electrode material after the nickel-based oxide precursor is mixed with lithium carbonate. A nickel element in the high-nickel layered positive electrode material prepared by employing the method mainly exists in Ni<3+> form, lithium and nickel mixing in the high-nickel layered positive electrode material can be reduced due to a few Ni<2+>, so that the electrical performance of the high-nickel layered positive electrode material can be obviously improved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a high-nickel layered positive electrode material using lithium carbonate as a lithium source, a preparation method and application thereof. Background technique [0002] High Nickel Layered Cathode Material LiNi x m 1-x o 2 (x≥0.8, M is one or more of Co, Mn, Al, etc.) The actual reversible capacity is up to 200mAh·g -1 Or higher, especially suitable as a high-energy battery cathode material for electric vehicles (EV) or hybrid electric vehicles (HEV). The lithium source commonly used in the preparation of ternary materials is lithium carbonate, followed by lithium hydroxide monohydrate. Although lithium hydroxide monohydrate is superior to lithium carbonate in terms of reactivity and reaction temperature, since the lithium content of lithium hydroxide monohydrate fluctuates more than lithium carbonate, and lithium hydroxide i...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王志兴李滔李新海郭华军李艳彭文杰胡启阳冷进
Owner CENT SOUTH UNIV