Lithium and manganese-rich cathode material of lithium ion battery and preparation method of cathode material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial Coulombic efficiency, large initial irreversible capacity, and poor cycle stability, so as to improve electrochemical performance and suppress irreversible Good chemical reaction and material processing performance

Active Publication Date: 2014-12-24
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] To sum up, there are the following technical problems in the prior art: one of the biggest problems in the positive electrode material is that when it is charged above 4.5V for the first

Method used

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  • Lithium and manganese-rich cathode material of lithium ion battery and preparation method of cathode material
  • Lithium and manganese-rich cathode material of lithium ion battery and preparation method of cathode material
  • Lithium and manganese-rich cathode material of lithium ion battery and preparation method of cathode material

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preparation example Construction

[0040] A preparation method of lithium-rich manganese cathode material for lithium ion battery, the lithium-rich manganese material is Li 2 TiO 3 Coated xLi 2 MnO 3 ·(1-x)LiNi 0.5-a / 2 mn 0.5-a / 2 al a o 2 (wherein, 0.1≤x≤0.9, 0.002≤a≤0.1) materials, the nickel-manganese-aluminum composite carbonate precursor is prepared by the co-precipitation method, and then sintered at high temperature to obtain a spherical or quasi-spherical nickel-manganese-aluminum composite oxide, Adding it into a solvent to disperse evenly, adding tetrabutyl titanate, hydrolyzing to obtain a nickel-manganese-aluminum-titanium compound compound, mixing with a lithium compound, and calcining to obtain a lithium-rich manganese cathode material. in particular:

[0041] Step 1. Preparation of Precursor

[0042] According to xLi 2 MnO 3 ·(1-x)LiNi 0.5-a / 2 mn 0.5-a / 2 al a o 2 In the chemical formula, the stoichiometric ratio of Ni, Mn, and Al is weighed to form a uniform mixed aqueous solution of...

Embodiment 1

[0048] The present embodiment provides a kind of preparation method of lithium-ion battery lithium-rich manganese cathode material, and this material is Li 2 TiO 3 Coated 0.5Li 2 MnO 3 0.5LiNi 0.485 mn 0.485 al 0.03 o 2 Material, Li 2 TiO 3 Accounting for 3.5% of the total mass of lithium-rich manganese. It includes the following steps.

[0049] Step 1. Preparation of Precursor

[0050] According to 0.5Li 2 MnO 3 0.5LiNi 0.485 mn 0.485 al 0.03 o 2 In the chemical formula, the stoichiometric ratio of Ni, Mn, and Al is weighed to form a uniform mixed aqueous solution of nickel sulfate, manganese nitrate, and aluminum sulfate. The total concentration of metal ions is 0.5mol / L. The temperature of the solution is controlled at a constant temperature of 40°C. Under stirring, Add the precipitating agent lithium carbonate to the mixed solution, the amount of lithium carbonate is the same as the total amount of metal ions, react for 8h, filter, wash, and dry to obtain t...

Embodiment 2

[0062]The present embodiment provides a kind of preparation method of lithium-ion battery lithium-rich manganese cathode material, and this material is Li 2 TiO 3 Coated 0.3Li 2 MnO 3 0.7LiNi 0.47 mn 0.47 al 0.06 o 2 Material, Li 2 TiO 3 Accounting for 0.3% of the total mass of lithium-rich manganese. It includes the following steps.

[0063] Step 1. Preparation of Precursor

[0064] According to 0.3Li 2 MnO 3 0.7LiNi 0.47 mn 0.47 al 0.06 o 2 In the chemical formula, the stoichiometric ratio of Ni, Mn, and Al is weighed to form a uniform mixed aqueous solution of nickel nitrate, manganese nitrate, and aluminum nitrate. The total concentration of metal ions is 2.0mol / L. The temperature of the solution is controlled at a constant temperature of 65°C. Under stirring, Add the precipitating agent lithium carbonate to the mixed solution, the amount of lithium carbonate is the same as the total amount of metal ions, react for 15h, filter, wash and dry to obtain the ni...

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Abstract

The invention relates to a lithium and manganese-rich cathode material of a lithium ion battery and a preparation method of the cathode material. The lithium and manganese-rich cathode material is a Li2TiO3-coated xLi2MnO3.(1-x)LiNi[0.5-a/2]Mn[0.5-a/2]AlaO2 (wherein x is not less than 0.1 and not more than 0.9 and a is not less than 0.002 and not more than 0.1) material. The preparation method comprises the following steps: preparing a nickel manganese aluminum compound carbonate precursor by a coprecipitation method, sintering at the high temperature to obtain spherical or quasi-spherical nickel manganese aluminum compound oxide, adding into a solvent, uniformly dispersing, adding tetrabutyl titanate, hydrolyzing to obtain a nickel manganese aluminum titanium compound, mixing with a lithium compound, and calcining to obtain the lithium and manganese-rich cathode material. The lithium and manganese-rich cathode material prepared by the method is high in first coulombic efficiency, good in circulation stability and high in rate performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a lithium-ion battery lithium-rich manganese cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, electric vehicles and other fields due to their high energy density, high operating voltage, and good cycle performance. With the expansion of the application field of lithium-ion batteries, higher requirements are put forward for the cathode materials of lithium-ion batteries, such as higher energy density, low price, excellent cycle life, higher rate performance, etc. Layered lithium-rich manganese cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Mn, Ni, Co, Ni 0.5 mn 0.5 , Cr, Ni 1 / 3 co 1 / 3 mn 1 / 3 , Fe...) is a kind of α-NaFeO 2 type solid solution material, composed of layered Li 2 MnO 3 and LiMO 2 (M=Mn, Ni, Co, Ni 0.5 mn 0.5 , Cr, Ni 1 / 3 co 1 / 3 mn 1 / 3...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘三兵梅周盛
Owner CHERY AUTOMOBILE CO LTD
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