Lithium ion battery cathode material and preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and lithium-rich cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of irreversible capacity loss, that is, low first coulombic efficiency, limited commercial application, poor cycle performance, etc., to overcome the problems of coulombic Inefficiency, low cost, effect of electrochemical performance modification

Inactive Publication Date: 2013-10-23
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium-rich cathode materials still have problems such as large irreversible capacity loss during the first charge and discharge pr

Method used

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  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] This embodiment provides a lithium-ion battery cathode material. The structure of the material is a lithium-rich cathode material 0.1Li 2 MnO 3 ·0.9LiNi 0.5 Mn 0.5 O 2 LiNi coated 0.5 Mn 1.5 O 4 , And the structure is a core-shell structure, where the lithium-rich cathode material 0.1Li 2 MnO 3 ·0.9LiNi 0.5 Mn 0.5 O 2 Is the core of the core-shell structure, LiNi 0.5 Mn 1.5 O 4 Is the shell of the core-shell structure, LiNi 0.5 Mn 1.5 O 4 It accounts for 18% of the mass of lithium-ion battery cathode materials.

[0043] The preparation method of the lithium ion battery cathode material in this embodiment includes the following steps:

[0044] (1) According to the molecular formula of lithium-rich cathode material 0.1Li 2 MnO 3 ·0.9LiNi 0.5 Mn 0.5 O 2 The coefficient ratio of Ni:Mn=9:11 is used to prepare a mixed aqueous solution of the first nickel salt nickel nitrate and the first manganese salt manganese nitrate, and the amount ratio of nickel ions to manga...

Example Embodiment

[0059] Example 2

[0060] This embodiment provides a lithium-ion battery cathode material. The structure of the material is 0.3Li 2 MnO 3 ·0.7LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 LiNi coated 0.1 Mn 1.9 O 4 , And the structure is a core-shell structure, in which the lithium-rich cathode material 0.3Li 2 MnO 3 ·0.7LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 Is the core of the core-shell structure, LiNi 0.1 Mn 1.9 O 4 Is the shell of the core-shell structure, LiNi 0.1 Mn 1.9 O 4 It accounts for 16% of the mass of lithium-ion battery cathode materials.

[0061] The method for preparing the positive electrode material of the lithium ion battery in this embodiment includes the following steps:

[0062] (1) According to the molecular formula of lithium-rich cathode material 0.3Li 2 MnO 3 ·0.7LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 The coefficient ratio in Ni:Co:Mn=7:7:16 is used to prepare a mixed aqueous solution of the first nickel salt nickel acetate, the first cobalt salt cobalt acetate and the first manganese salt manganese a...

Example Embodiment

[0070] Example 3

[0071] This embodiment provides a lithium-ion battery cathode material. The structure of the material is 0.4Li 2 MnO 3 ·0.6LiNi 0.5 Co 0.3 Mn 0.2 O 2 LiNi coated 0.4 Mn 1.6 O 4 , And the structure is a core-shell structure, in which the lithium-rich cathode material 0.4Li 2 MnO 3 ·0.6LiNi 0.5 Co 0.3 Mn 0.2 O 2 Is the core of the core-shell structure, LiNi 0.4 Mn 1.6 O 4 Is the shell of the core-shell structure, LiNi 0.4 Mn 1.6 O 4 It accounts for 2% of the mass of lithium-ion battery cathode materials.

[0072] The method for preparing the positive electrode material of the lithium ion battery in this embodiment includes the following steps:

[0073] (1) According to the molecular formula of lithium-rich cathode material 0.4Li 2 MnO 3 ·0.6LiNi 0.5 Co 0.3 Mn 0.2 O 2 The coefficient ratio of Ni:Co:Mn=15:9:26 is used to prepare a mixed aqueous solution of the first nickel salt nickel sulfate, the first cobalt salt cobalt sulfate and the first manganese salt manganese s...

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Abstract

The invention discloses a lithium ion battery cathode material and a preparation method thereof and a lithium ion battery; and the lithium ion battery cathode material has a structure of covering LiNiyMn2-yO4 outside lithium-rich cathode material, wherein y is more than 0 and less than or equal to 0.5. The lithium ion battery cathode material not only has the outstanding advantages of high specific capacity and high voltage of the lithium-rich cathode material, but also has the advantages of high voltage, high capacity retention ratio, good cycling stability and rate capability and long service life of LiNiyMn2-yO4. Compared with single lithium-rich cathode material, the lithium ion battery cathode material which is formed by covering the LiNiyMn2-yO4 outside the lithium-rich cathode material overcomes the defects that the single lithium-rich cathode material is low in first time coulomb efficiency and poor in rate capability; the electrochemical performance of the lithium ion battery cathode material is improved. Furthermore, the lithium ion battery cathode material is simple in preparation technology and low in cost, thus being very suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material, a preparation method thereof, and a battery. Background technique [0002] With the advancement of science and technology, the requirements for energy storage devices in the fields of electronic products (mobile phones, digital products, notebook computers, etc.), electric vehicles, medical equipment, and aerospace are increasing. Conventional cathode materials such as LiCoO 2 , LiMn 2 o 4 、LiFePO 4 etc. have increasingly failed to meet people's needs for high capacity, high energy density, long cycle life, small self-discharge, no memory effect, and no pollution to the environment for lithium-ion batteries. Layered lithium-rich 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 layer...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCY02E60/12Y02E60/10
Inventor 刘三兵翟丽娟
Owner CHERY AUTOMOBILE CO LTD
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