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Nickel-based positive electrode material with core-shell structure and preparation method thereof

A core-shell structure and cathode material technology, applied in the field of nickel-based cathode materials and their preparation, can solve the problems of lithium ion cathode material research and few patents, and achieve excellent cycle stability, good layered structure, and uniform particle size distribution. Effect

Inactive Publication Date: 2019-08-02
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are very few studies and patents on the preparation of core-shell structure lithium ion cathode materials by spray drying using metal salts as raw materials, especially the lack of research on the preparation of nickel-based cathode materials by spray drying of polymetallic chloride salts.

Method used

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  • Nickel-based positive electrode material with core-shell structure and preparation method thereof
  • Nickel-based positive electrode material with core-shell structure and preparation method thereof
  • Nickel-based positive electrode material with core-shell structure and preparation method thereof

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Effect test

Embodiment 1

[0037] The invention provides a nickel-based ternary core-shell structure precursor, which is composed of the following molecular formula: Ni u co v mn w o x @Ni a x b Y c o x , where 0.5a x b Y c o x , the molecular formula of the precursor shell is Ni u co v mn w o x .

[0038] Preferably, the X is Co, and Y is one of Mn and Al.

[0039] Preferably, the chemical formula of the core layer is Ni 0.8 co 0.1 mn 0.1 o 2 , the chemical formula of the shell is Ni 0.5 co 0.2 mn 0.3 o 2 .

[0040] figure 1 It is a nickel-based ternary core-shell structure precursor Ni 0.5 co 0.2 mn 0.3 o x @Ni 0.8 co 0.1 mn 0.1 o x The SEM spectrum of the figure, from the spectrum, it can be seen that the obtained nickel-based oxide precursor Ni 0.5 co 0.2 mn 0.3 o x @Ni 0.8 co 0.1 mn 0.1 o x The morphology is a sphere with a rough surface, and an obvious core-shell structure is formed. It can be seen that the nickel-based oxide precursor Ni 0.5 co 0.2 mn 0....

Embodiment 2

[0042] The invention provides a nickel-based positive electrode material with a core-shell structure, which consists of the following molecular formula: LiNi u co v mn w o 2 @LiNi a x b Y c o 2 , where 0.5a x b Y c o 2 , the molecular formula of the shell is LiNi u co v mn w o 2 .

[0043] Preferably, the metal salt is sulfate, X is Co, and Y is one of Mn and Al.

[0044] Preferably, the molecular formula of the nickel-based positive electrode material having a core-shell structure is LiNi 0.5 co 0.2 mn 0.3 o 2 @LiNi 0.8 co 0.1 mn 0.1 o 2 , where the molecular formula of the core layer is LiNi 0.8 co 0.1 mn 0.1 o 2 , the molecular formula of the shell is LiNi 0.5 co 0.2 mn 0.3 o 2 .

[0045] Among them, the core layer precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 , where sodium hydroxide aqueous solution and ammonia water are used as co-precipitation materials, and the metal salt solution is NiSO 4 、CoSO 4 and MnSO 4 . Using Ni(NO) 2 , Co(NO) 2 ...

Embodiment 3

[0050] The present invention also provides a nickel-based oxide precursor Ni 0.5 co 0.2 mn 0.3 o x @Ni 0.8 co 0.1 mn 0.1 o x and LiNi with core-shell structure 0.5 co 0.2 mn 0.3 o 2 @LiNi 0.8 co 0.1 mn 0.1 o 2 A method for preparing a nickel-based cathode material.

[0051] The nickel-based cathode material LiNi with a core-shell structure 0.5 co 0.2 mn 0.3 o 2 @LiNi 0.8 co 0.1 mn 0.1 o 2 The preparation method comprises the steps:

[0052] S1: NiSO 4 、CoSO 4 and MnSO 4 According to the molar ratio of 8:1:1, a solution A with a total metal ion concentration of 1mol / L was prepared;

[0053] S2: Under the protection of a nitrogen atmosphere, drop the solution A into the reactor at a rate of 50mL / min. In the reactor, nitrogen is used as a protective atmosphere, the reaction temperature is 60°C, and at the same time, a concentration of 4mol / min is dripped at a certain speed. The sodium hydroxide aqueous solution of 1 L and 5mol / L ammoniacal liquor make t...

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Abstract

The invention belongs to the technical field of a positive electrode material for lithium-ion batteries, and relates to a preparation method of a nickel-based precursor and positive electrode materialwith a heterogeneous core-shell structure. The preparation method comprises the steps of S1, dissolving metal salts with a molar ratio of Ni:X:Y=a:b:c into an aqueous solution A with certain concentration; S2, preparing a co-precipitation material; S3, filtering and drying precipitates in the solution in the step S2 to obtain a powder material; S4, dissolving metal salts with a molar ratio of Ni:Co:Mn=u:v:w into an aqueous solution B with certain concentration, stirring the aqueous solution B and the powder material in the step S3 to form a suspension; S5, conducting a spray drying experimenton the suspension in the step S4, and collecting a powder product; and S6, placing the collected powder in the air for sintering, then uniformly mixing the sintered powder with lithium salt accordingto a certain molar ratio, and carrying out solid-state sintering to obtain the nickel-based positive electrode material with the core-shell structure. The synthesized nickel-based positive electrodematerial has the characteristics such as high specific capacity and excellent cycle stability.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a nickel-based positive electrode material with a heterogeneous core-shell structure prepared by spray-drying a metal salt as a raw material and a preparation method thereof. Background technique [0002] In the prior art, the spinel structure cathode material (such as LiMn 2 o 4 ), polyanionic cathode materials (such as Li 2 MSiO 4 (M=Mn, Fe), LiCo 1 / 3 mn 1 / 3 Fe 1 / 3 PO 4 ) and layered low-nickel cathode materials (such as LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ) has good electrochemical performance, but the prepared cathode materials are all materials with uniform composition. [0003] Nickel-based cathode material LiNi x m 1-x o 2 (x≥0.8, M is one or more of Co, Mn, Al, etc.) high reversible capacity, suitable as anode material for lithium-ion batteries for pure electric vehicles (EV). Although high-nickel cathode materials ha...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 颜果春邓旭红彭文杰王接喜李新海王志兴郭华军胡启阳
Owner CENT SOUTH UNIV
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