Method for preparing submicron-sized anode material LiCoxNiyMnzO2 of lithium-ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems that greatly affect material rate charge and discharge performance

Inactive Publication Date: 2009-11-18
HARBIN NORMAL UNIVERSITY
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the larger particle size of the positive electrode material of the micron-scale battery affects the rate charge and discharge performance of the material, and provides a submicron lithium-ion battery positive electrode material LiCo x Ni y mn z o 2 preparation method

Method used

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  • Method for preparing submicron-sized anode material LiCoxNiyMnzO2 of lithium-ion battery
  • Method for preparing submicron-sized anode material LiCoxNiyMnzO2 of lithium-ion battery
  • Method for preparing submicron-sized anode material LiCoxNiyMnzO2 of lithium-ion battery

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specific Embodiment approach 1

[0009] Specific implementation mode 1: In this implementation mode, the positive electrode material LiCo of sub-micron lithium-ion battery x Ni y mn z o 2 The preparation method is as follows: 1. According to the chemical formula LiCo x Ni y mn z o 2 , respectively weigh cobalt salt, nickel salt and manganese salt according to the molar ratio of Li element, Ni element and Mn element as x:y:z, and then dissolve them in distilled water to obtain system 1, where x Ni y mn z o 2 ; Wherein the concentration of cobalt salt in step 1 system 1 is 0.5~2mol / L; In step 3, the volume ratio of system 1 and system 2 is 1: 1, and the volume ratio of distilled water and system 1 is 2.5~10: 1, step 3 The reaction vessel described in was placed in a mixture of ice and water.

[0010] The ball mill used in this embodiment is a QM-3SP04 planetary ball mill produced by Nanjing University Instrument Factory.

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment differs from Embodiment 1 in that the cobalt salt described in step 1 is cobalt sulfate, cobalt acetate or cobalt nitrate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the cobalt salt described in step 1 is a combination of any two of cobalt sulfate, cobalt acetate and cobalt nitrate. Others are the same as in the first embodiment.

[0013] In the cobalt salt described in this embodiment, the two components are mixed in any ratio.

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Abstract

The invention relates to a method for preparing an anode material of a lithium-ion battery, in particular to a method for preparing a submicron-sized anode material LiCoxNiyMnzO2 of a lithium-ion battery. The invention solves the problem that the rate charge / discharge performance of the material is greatly affected by the micron-sized anode material with larger particle size of a battery. The method of the invention comprises the following steps: (1), dissolving cobalt salt, nickel salt and manganese salt in distilled water to obtain a system 1; (2), dissolving sodium hydroxide and chelator in distilled water to obtain a system 2; (3) adding the system 1 and the system 2 in a reaction kettle placed in a mixture of ice and water, then, filtering and further drying the filter residue to obtain precursor powder; (4) ball-milling and mixing the lithium resource and the precursor powder and sintering to obtain the anode material of the lithium-ion battery. Compared with the micron-sized anode material of the lithium-ion battery, the submicron-sized anode material of the lithium-ion battery prepared by the method of the invention reduces the particle size, thereby improving the rate charge / discharge performance.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] There are many systems of positive electrode materials for lithium-ion batteries developed at present. The particle size of lithium transition metal oxide materials prepared by existing lithium-ion battery positive electrode materials (such as co-precipitation method, solid phase method, sol-gel method) is The particle size is 6 μm to 10 μm (micron level), and the larger particle size leads to a longer path for lithium ions in the electrochemical diffusion process, which affects the rate charge and discharge performance of the material. Although the particles of nano-scale materials are small, the electrochemical high-rate charge-discharge performance is also good, but the tap density of the material is low, and the contact area between the material and the electrolyte is large, which leads to poor cycle performance of ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/48H01M4/50H01M4/52C01G53/04
CPCY02E60/12Y02E60/10
Inventor 邓超高颖邬冰
Owner HARBIN NORMAL UNIVERSITY
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