Anode active material for lithium cell and method for manufacturing same

A manufacturing method, lithium battery technology, applied to battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve problems such as poor structural stability, battery fire, rupture, etc., to achieve thermalization suppression, structural stability, and ensure thermal stability Effect

Active Publication Date: 2016-03-02
IUCF HYU (IND UNIV COOP FOUND HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the metal composition of the positive electrode active material changes discontinuously between the composition of the generated internal substance and the composition of the external substance, and the internal structure is unstable.
[0009] Moreover, for the positive electrode active material with a layered structure, in order to obtain a large capacity, it is necessary to increase the content of Ni in the transfer metal, but when the Ni content is high, compared with other transfer metals such as Mn, the structural stability during charging is poor, and, because When the temperature of the battery rises due to an internal short circuit, etc., the oxygen released from the positive electrode material reacts with the electrolyte at a relatively low temperature, and a large exothermic reaction occurs. Therefore, there is a risk of the battery catching fire and breaking

Method used

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  • Anode active material for lithium cell and method for manufacturing same
  • Anode active material for lithium cell and method for manufacturing same
  • Anode active material for lithium cell and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] In order to produce an active material in which the concentration of nickel decreases continuously from the center to the surface, and the concentration of cobalt and manganese increases continuously from the center to the surface, and is doped with aluminum, first, as a metal salt solution for forming the center, the following 78:0:22 molar ratio mixed nickel sulfate: cobalt sulfate: manganese sulfate 2.4M concentration of metal aqueous solution, and prepared as the surface portion forming metal salt solution containing nickel sulfate: cobalt sulfate: manganese sulfate 54:19:27 Molar ratio of aqueous metal solutions.

[0062] After putting 4 liters of distilled water into the co-precipitation reactor (capacity 4L, rotating motor power 80W), hydrogen gas was supplied to the reactor at a rate of 0.5 liter / min to remove dissolved oxygen so that the temperature of the reactor was maintained at 50°C. and stirred at 1000 rpm.

[0063] The aqueous solution of the metal salt ...

Embodiment 2

[0071] In order to produce particles in which the metal concentration shows two concentration gradient gradients, first, as the first metal salt solution, a 2.4M concentration of metal was prepared by mixing nickel sulfate: cobalt sulfate: manganese sulfate at a molar ratio of 98:0:2. Aqueous solution, as the 2nd metal salt aqueous solution, has prepared the metal aqueous solution that comprises nickel sulfate: cobalt sulfate: manganese sulfate 91:3:6 mol ratio, and as the 3rd metal salt aqueous solution, has prepared nickel sulfate: cobalt sulfate: manganese sulfate 63:6:31 molar ratio of metal aqueous solution.

[0072] Change the mixing ratio of the 1st metal salt solution and the 2nd metal salt solution, drop into the reactor with 0.3 liters / hour, change the mixing ratio of the 2nd metal salt solution and the 3rd metal salt solution again, to the reaction Introduced into the container, the co-precipitation reaction was carried out, and the precursor particles with a metal ...

Embodiment 3

[0075] In order to produce particles containing a concentration gradient part on the outer surface of the chip part where the metal concentration is fixed, first, as the first metal salt solution, a 2.4M solution in which nickel sulfate: cobalt sulfate: manganese sulfate was mixed at a molar ratio of 95:1:4 was prepared. Concentration of the metal aqueous solution, and as the 2nd metal salt aqueous solution, prepared the metallic aqueous solution that comprises nickel sulfate: cobalt sulfate: manganese sulfate 55:15:30 molar ratio.

[0076] and supply the first metal salt solution for a predetermined time, and after manufacturing a chip part with a fixed metal concentration, change the mixing ratio of the first metal salt solution and the second metal salt solution, and introduce them into the reactor to perform Co-precipitation reaction was used to produce particles including a concentration gradient part on the outer surface of the chip part where the metal concentration was ...

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Abstract

The present invention relates to an anode active material for a lithium cell and method for manufacturing the same, and more specifically relates to a manufacturing method of an anode active material for a lithium cell doped with a different metal and having a concentration gradient and the anode active material for the lithium cell doped with the different metal and having the concentration gradient according to the method.

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium battery and a manufacturing method thereof, and in more detail relates to a method for manufacturing a positive electrode active material doped with a different metal and having a concentration gradient, and a different metal doped therewith and having a concentration gradient. Cathode active material for gradient lithium batteries. Background technique [0002] Recently, with the rapid development of the electronics, communication, and computer industries, the use of portable electronic products such as camcorders, mobile phones, and laptop computers has become widespread. As a result, the demand for lightweight, durable, and reliable batteries has also increased. [0003] In particular, the working voltage of the lithium secondary battery is above 3.7V, and the energy density per unit weight is higher than that of the cadmium-nickel battery or the nickel-hydrogen batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/525H01M4/485H01M4/13
CPCC01G53/44H01M4/131H01M4/1391H01M4/362H01M4/485H01M4/505H01M4/525Y02E60/10H01M4/366H01M4/54H01M10/0525H01M2220/20H01M2220/30
Inventor 宣良國尹誠晙李尙奕
Owner IUCF HYU (IND UNIV COOP FOUND HANYANG UNIV)
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