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Cylindrical battery comprising pressurizing part and method of manufacturing same

A cylindrical battery, cylindrical container technology, applied in the direction of cylindrical shell battery/battery, secondary battery manufacturing, battery, etc., can solve problems such as battery life characteristics reduction

Active Publication Date: 2017-05-24
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lifespan characteristics of the battery may decrease due to the dissolution of Mn in the cathode active material and the side reaction of the electrolyte caused by the high charge-discharge voltage potential.

Method used

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  • Cylindrical battery comprising pressurizing part and method of manufacturing same
  • Cylindrical battery comprising pressurizing part and method of manufacturing same
  • Cylindrical battery comprising pressurizing part and method of manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] 90% by weight LiNi as positive electrode active material 0.5 mn 1.5 o 4 , 5% by weight of a conductive agent (Super-P) and 5% by weight of a binder (PVdF) were mixed with N-methyl-2-pyrrolidone (NMP) to prepare a positive electrode mixture. Subsequently, on an aluminum foil having a thickness of 20 μm, the positive electrode mixture was coated, pressed, and dried to manufacture a positive electrode.

[0104] 90% by weight of the negative electrode active material (Li 1.33 Ti 1.67 o 4 ), 5% by weight of a conductive agent (Super-P) and 5% by weight of a binder (PVdF) were mixed with NMP to prepare an anode mixture. Subsequently, on a copper foil having a thickness of 20 μm, the anode mixture was coated, pressed, and dried to manufacture an anode.

[0105] A separator having a thickness of 20 μm was inserted between the cathode and anode manufactured as described above to manufacture an electrode assembly. Subsequently, the electrode assembly was housed in a cylind...

Embodiment 2

[0107] A cylindrical battery was fabricated in the same manner as in Example 1 except that 3.5 g of the electrolytic solution was injected into the cylindrical container. At this time, the volume of the pressurizing portion was 2.5% of the volume of the housing portion.

experiment Embodiment 1

[0111] The batteries manufactured according to Example 1, Example 2, and Comparative Example 1 were charged and discharged at 1C in a chamber at a temperature of 25°C to measure the capacity retention ratio of the batteries. The result is shown in Figure 8 and Figure 9 .

[0112] refer to Figure 8 , the capacity of the pouch-shaped battery fabricated according to Comparative Example 1 suddenly decreased as the pouch-shaped battery was repeatedly charged and discharged, while the cylindrical battery fabricated according to Example 1 exhibited high capacity retention even after 100 cycles Rate.

[0113] These results show that the use of a positive electrode active material containing a high content of Mn in a cylindrical battery including a pressurizing part is more effective than the case of using a positive electrode active material containing a high content of Mn in a pouch-shaped battery not including a pressurizing part. In this case, the life characteristics of the...

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Abstract

The present invention relates to a cylindrical battery, comprising: an electrode assembly (a jelly-roll) including a cathode, a separation membrane and an anode; a cylindrical can including a receiving part for holding the electrode assembly and an electrolyte together; a cap assembly mounted on the open top portion of the cylindrical can; a safety vent built in the cap assembly; and a pressurizing part which is located between the safety vent and the receiving part, is in communication with the receiving part and applies a certain pressure on the receiving part by means of a gas, wherein the cathode comprises, as a cathode active material, a lithium-complex transition metal oxide expressed by chemical formula 1 in the specification.

Description

technical field [0001] This application claims priority to Korean Patent Application No. 10-2014-0130182 filed with the Korean Intellectual Property Office on September 29, 2014, the disclosure of which is hereby incorporated herein by reference in its entirety. [0002] The present invention relates to a cylindrical battery including a pressurizing portion and a manufacturing method thereof. Background technique [0003] The rapid increase in the use of fossil fuels has promoted the demand for alternative or clean energy sources, and research on power generation and storage using electrochemical technologies has been actively conducted. [0004] A typical example of an electrochemical device using such electrochemical energy is a secondary battery, which has been increasingly used in various fields. [0005] Based on the shape of the battery case, secondary batteries can be classified into: cylindrical batteries having an electrode assembly housed in a cylindrical metal co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/12H01M4/36H01M4/505H01M4/525H01M10/052H01M10/0587H01M10/04H01M50/152H01M50/167H01M50/342
CPCH01M4/485H01M4/505H01M4/525H01M2200/20Y02P70/50Y02E60/10H01M50/56H01M50/171H01M50/3425H01M50/578H01M50/167H01M4/36H01M4/48H01M4/50H01M10/0422H01M10/0525H01M2200/106H01M10/0587
Inventor 李慧娟宋周容金镒弘
Owner LG ENERGY SOLUTION LTD
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