High voltage lithium ion battery anode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of metal ion loss and content, and achieve the effect of superior electrochemical performance

Active Publication Date: 2015-05-06
思伊纳化学科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ammonia molecules dissolved in the solution are very easy to complex with some metal ions, resulting in the loss of metal ions, resulting in a large amount of impurity in the synthesized material, which is also one of the most important problems faced by the ammonium salt co-precipitation method.

Method used

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  • High voltage lithium ion battery anode material and preparation method thereof
  • High voltage lithium ion battery anode material and preparation method thereof
  • High voltage lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Novel liquid phase method to prepare LiNi 0.5 Mn 1.5 O 4 Positive electrode material

[0042] 1) According to the chemical formula of the target product LiNi 0.5 Mn 1.5 O 4 , take manganese sulfate and nickel sulfate according to a 1:3 metering ratio, and prepare an aqueous solution A with a total concentration of Ni and Mn ions of 0.5 mol / L;

[0043] 2) The aqueous solution A prepared above was heated to 70°C in a water bath, and the pH value of the solution was adjusted to 7 with dilute sulfuric acid and ammonia;

[0044] 3) Prepare ammonium oxalate solution B with a concentration of 0.5mol / L;

[0045] 4) Keep the aqueous solution A at a constant temperature of 70°C and stir at a constant speed, the rotation speed is 400 rpm, and at the same time, slowly add the ammonium oxalate solution B to the aqueous solution A. After the precipitation is completed, add 5-20% (excess) ammonium oxalate solution B in a stoichiometric ratio to ensure that the precipitation ...

Embodiment 2

[0054] 1. Novel liquid phase method to prepare LiNi 0.5 Mn 1.5 O 4 Positive electrode material

[0055] The total concentration of Ni and Mn ions in step 1) of Example 1 was changed to 1 mol / L. Other conditions are the same as in Example 1.

[0056] 2. LiNi prepared by this method 0.5 Mn 1.5 O 4 The physical and electrochemical properties of

[0057] Detected LiNi 0.5 Mn 1.5 O 4 The XRD characteristics of 1 are the same as those of 1, and SEM inspection shows that the synthesized LiNi 0.5 Mn 1.5 O 4 The particle size is about 3-4mm, and the tap density is 2.1 g / cm 3 . Using the same electrochemical test method, under the charge and discharge current of 0.3C, the material obtained in this example has an initial discharge specific capacity of 137.3 mA / g, of which the discharge capacity in the 4.7V high voltage region is 135.8 mA hour / g, after 300 cycles, the capacity retention rate is 89%; at 3C, the material has a specific discharge capacity of 121 mAh / g.

Embodiment 3

[0059] 1. Novel liquid phase method to prepare LiNi 0.5 Mn 1.5 O 4 Positive electrode material

[0060] The total concentration of Ni and Mn ions in step 1) of Example 1 was changed to 0.1 mol / L. Other conditions are the same as in Example 1.

[0061] 2. LiNi prepared by this method 0.5 Mn 1.5 O 4 The physical and electrochemical properties of

[0062] Detected LiNi 0.5 Mn 1.5 O 4 The XRD characteristics of 1 are the same as those of 1, and SEM inspection shows that the synthesized LiNi 0.5 Mn 1.5 O 4 The particle size is about 10-15mm, and the tap density is 2.6 g / cm 3 . Using the same electrochemical test method, under the charge and discharge current of 0.3C, the material obtained in this example has an initial discharge specific capacity of 130.3 mA / g, of which the discharge capacity in the 4.7V high voltage region is 126.8 mA hour / g, after 300 cycles, the capacity retention rate is 91%; at 3C, the material has a specific discharge capacity of 112.2 mAh / g. ...

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Abstract

The invention discloses a high voltage lithium ion battery anode material and a preparation method thereof. The general formula of the anode material is LiNi0.5-xMn1.5-yMx+yO4, wherein M is other transition group metallic elements, x is greater than or equal to 0 and is less than or equal to 0.1, and y is greater than or equal to 0 and is less than or equal to 0.1. The invention also provides a preparation method of the high voltage lithium ion battery anode material. The preparation method provided by the invention has the advantages that the process is simple, the LiNi0.5-xMn1.5-yMx+yO4 anode materials with different specifications and electrochemistry characteristics are synthesized through controlling the parameters of a reaction process, the cost is low, and the preparation method is suitable for industrialization scale production; and the preparative anode material can better meet the requirement of high energy density power lithium ion batteries in the physical property and the electrochemistry property.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery and a preparation method thereof, in particular to a positive electrode material of a high voltage lithium ion battery and a preparation method thereof, belonging to the technical field of batteries. Background technique [0002] At present, human beings are facing the dual challenges of resource estimation and deterioration of living environment. To this end, countries around the world are striving to develop new materials, promote the new concept of low-carbon life, and promote human society from the current high-energy and high-consumption lifestyle and production mode to an energy-saving and recyclable sustainable development mode. Specifically, it is to vigorously promote the application of clean energy, such as the application of solar energy and wind energy in the field of power generation, and the use of hybrid vehicles or pure electric vehicles to replace the tradi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391
CPCY02E60/10
Inventor 晨晖朱智李卫廖细英漠楠苗子帅
Owner 思伊纳化学科技(北京)有限公司
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