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Solid solution material and preparation method thereof as well as lithium ion battery containing material

A solid and lithium source technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of low specific capacity, low initial coulombic efficiency and poor cycle performance of lithium-ion batteries, and achieve high specific capacity, Excellent cycle performance and high Coulombic efficiency

Active Publication Date: 2014-07-30
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to solve the 0.5LiNi that prior art method makes 0.5 mn 1..5 o 4 0.5Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 The first coulombic efficiency or low specific capacity and poor cycle performance of materials and lithium-ion batteries prepared therefrom provide a 0.5LiNi 0.5 mn 1..5 o 4 0.5Li 2 MnO 3 0.5LiNi 0.5 Mn0.5O 2 Material preparation method

Method used

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  • Solid solution material and preparation method thereof as well as lithium ion battery containing material
  • Solid solution material and preparation method thereof as well as lithium ion battery containing material
  • Solid solution material and preparation method thereof as well as lithium ion battery containing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a kind of 0.5LiNi 0.5 mn 1.5 o 4 0.5Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 The method of preparation of the material, including:

[0034] Step 1. Preparation of nickel-manganese precursor Ni by co-precipitation 0.5 mn 1.5 (OH) 4

[0035] Prepare the aqueous solution of the mixture of nickel acetate and manganese nitrate according to the proportion of the substance Ni:Mn=1:3, and add NaOH solution with a molar concentration of 2M to the mixed solution dropwise under stirring, and control the pH value of the mixed solution at 10.2 around to ensure Ni 2+ , Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 110°C for 12 hours to obtain the precursor Ni 0.5 mn 1.5 (OH) 4 .

[0036] Step 2. Nickel-manganese precursor Ni 0.5 mn 1.5 (OH) 4 preprocessing

[0037] Lithium nitrate and lithium carbonate (the ratio of the two substances is 1:1), the precursor Ni 0.5 mn 1.5 ...

Embodiment 2

[0047] This embodiment provides a kind of 0.5LiNi 0.5 mn 1.5 o 4 0.5Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 Preparation method of material:

[0048] Step 1. Preparation of nickel-manganese precursor Ni by co-precipitation 0.5 mn 1.5 (OH) 4

[0049] According to the ratio of substance Ni:Mn=1:3, prepare nickel nitrate and nickel acetate (the ratio of the two substances is 1:1), and the aqueous solution of the mixture of manganese sulfate is added dropwise to the mixed solution in a stirring state. NaOH solution with a concentration of 2M, and the pH value of the mixed solution is controlled at about 10.5 to ensure that the Ni 2+ , Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 110°C for 12 hours to obtain the precursor Ni 0.5 mn 1.5 (OH) 4 .

[0050] Step 2. Nickel-manganese precursor Ni 0.5 mn 1.5 (OH) 4 preprocessing

[0051] The precursor Ni obtained in step 1) 0.5 mn 1.5 (OH) 4 Drying,...

Embodiment 3

[0058] This embodiment provides a kind of 0.5LiNi 0.5 mn 1.5 o 4 0.5 Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 The method of preparation of the material, including:

[0059] Step 1. Preparation of nickel-manganese precursor Ni by co-precipitation 0.5 mn 15 (OH) 4

[0060] Prepare the mixture aqueous solution of nickel sulfate, manganese chloride and manganese sulfate (the ratio of the two substances is 1:1) according to the ratio of substance Ni:Mn=1:3, and add it dropwise to the mixed solution under stirring KOH solution with a molar concentration of 2M, the pH value of the mixed solution is controlled at about 10.1 to ensure that the Ni 2+ , Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 110°C for 12 hours to obtain the precursor Ni 0.5 mn 1.5 (OH) 4 .

[0061] Step 2. Nickel-manganese precursor Ni 0.5 mn 1.5 (OH) 4 preprocessing

[0062] Lithium acetate and precursor Ni 0.5 mn 1.5 (OH) 4...

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Abstract

The invention provides a solid solution material and a preparation method thereof as well as a lithium ion battery containing the material, belongs to the technical method of the lithium ion battery, and solves the problems of low first coulomb efficiency or low specific capacity and poor circulating performance of the existing 0.5LiNi0.5Mn1.5O4*0.5Li2MnO3*0.5LiNi0.5Mn0.5O2 material and the lithium ion battery prepared from the material. The preparation method of the solid solution material disclosed by the invention comprises a step of nickel-manganese precursor preparation based on a co-precipitation method, a step of precursor pre-treatment and a step of solid phase synthesizing. The solid solution material with a good performance can be obtained through selecting suitable technical parameters so that the material and the lithium ion battery prepared from the material have high first coulomb efficiency, high specific capacity and good circulating performance.. The solid solution material prepared by the invention is prepared by the preparation method. The lithium ion battery disclosed by the invention comprises the solid solution material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a 0.5LiNi battery 0.5 mn 1.5 o 4 0.5Li 2 MnO 3 · 0.5 LiNi 0.5 mn 0.5 o 2 Material and preparation method thereof, lithium ion battery containing the material. Background technique [0002] With the rapid development of various portable electronic products and communication tools, batteries, as an important power supply device and storage device, have attracted the attention of researchers from various countries. As a kind of battery, lithium-ion battery has been widely used due to its superior performance. Modern society has higher and higher requirements for the energy and power of lithium-ion batteries. The positive electrode materials of general lithium-ion batteries (such as LiCoO 2 , LiMn 2 o 4 、LiFePO 4 ) is increasingly unable to meet people's needs for high-capacity, high-energy-density electronic products. Layered lithium-rich cathode material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505C01G45/12C01G53/00H01M4/525H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 刘三兵刘云建翟丽娟
Owner CHERY AUTOMOBILE CO LTD
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