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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: 2013-04-24
纳林其木格
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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
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Embodiment 1

[0041] 1. Preparation of LiNi by a new liquid phase method 0.5 mn 1.5 o 4 Cathode material

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

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

[0044] 3) The preparation concentration is the ammonium oxalate solution B of 0.5mol / L;

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

Embodiment 2

[0054] 1. Preparation of LiNi by a new liquid phase method 0.5 mn 1.5 o 4 Cathode material

[0055] Change the total concentration of Ni and Mn ions in step 1) of Example 1 to 1 mol / L. Other conditions are identical with embodiment 1.

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

[0057] The detected LiNi 0.5 mn 1.5 o 4 The XRD characteristics of 1 are the same as those of 1, and SEM detection 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 mAh / g, and the discharge capacity in the 4.7V high voltage region is 135.8 mAh hours / g, after 300 cycles, the capacity retention rate is 89%; under 3C conditions, the material has a discharge specific capacity of 121 mAh / g...

Embodiment 3

[0059] 1. Preparation of LiNi by a new liquid phase method 0.5 mn 1.5 o 4 Cathode material

[0060] Change the total concentration of Ni and Mn ions in step 1) of Example 1 to 0.1mol / L. Other conditions are identical with embodiment 1.

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

[0062] The detected LiNi 0.5 mn 1.5 o 4 The XRD characteristics of 1 are the same as those of 1, and SEM detection 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 embodiment has an initial discharge specific capacity of 130.3 mAh / g, and the discharge capacity in the 4.7V high voltage region is 126.8 mAh hours / g, after 300 cycles, the capacity retention rate is 91%; under 3C conditions, the material has a discharge specific capacity of 112...

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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 lithium-ion battery cathode material and a preparation method thereof, in particular to a high-voltage lithium-ion battery cathode material and a preparation method thereof, and belongs to the technical field of batteries. Background technique [0002] At present, human beings are facing the dual challenges of resource estimation and living environment deterioration. To this end, countries around the world are working hard to develop new materials, promote new concepts of low-carbon life, and promote human society to shift from the current high-energy consumption and high-consumption life and production mode to energy-saving, recyclable and sustainable development. Specifically, 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 electric vehicles or pure electric vehicles to replace traditional gasoline-powered veh...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 晨晖朱智李卫廖细英漠楠苗子帅
Owner 纳林其木格
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