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Lithium secondary battery

A lithium secondary battery and lithium metal oxide technology, which is applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of not being able to provide life battery safety, and achieve the effect of improving life characteristics and puncture stability

Pending Publication Date: 2019-11-08
SK ON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this still doesn't provide enough longevity and battery safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Using lithium metal oxide (hereinafter referred to as CSG) as the cathode active material, the composition of the lithium metal oxide is LiNi 0.80 co 0.10 mn 0.10 o 2 , the central part is composed of LiNi 0.83 co 0.10 mn 0.07 o 2 , the surface part is composed of LiNi 0.78 co 0.10 mn 0.12 o 2 , and has a concentration gradient region between the central part and the surface part, using DenkaBlack as a conductive agent, and using PVDF as a binder. The cathode active material, the conductive agent, and the binder were respectively mixed in a weight ratio of 92:5:3 to prepare cathode slurry. The cathode slurry was coated on an aluminum substrate, then dried and pressed to prepare a cathode.

[0091] For reference, the concentration gradient of lithium metal oxide is shown in Table 1 below, and the measurement position of the concentration is shown in figure 1 middle. The concentration was measured at intervals of 0.4 μm from the surface of the lithium metal o...

Embodiment 2-29

[0102] Batteries were fabricated by the same method as in Example 1 except that the composition and thickness were changed as shown in Table 2 below (the anode was also double-sided).

[0103] [Table 2]

[0104]

[0105]

experiment example

[0114] 1. Life characteristics at room temperature

[0115] Repeat 500 times of charging (CC-CV 2.0C 4.2V0.05C cut-off) and discharge (CC 2.0C 2.75V cut-off) for the battery cells prepared in Examples and Comparative Examples, and then calculate the discharge of the 500th cycle (CY) The percentage (%) of capacity relative to the first cycle discharge capacity to measure the lifetime characteristics at room temperature.

[0116] The results are shown in Tables 4 and 5 below.

[0117] 2. Puncture safety assessment

[0118] The batteries prepared in Examples and Comparative Examples were punctured from the outside with a nail to check whether fire or explosion occurred.

[0119] The results are shown in Table 4 and Table 5 below.

[0120] [Table 4]

[0121]

[0122]

[0123] [table 5]

[0124]

[0125]

[0126] Referring to Table 4 and Table 5, the life characteristics and puncture safety of the batteries in Examples are greater than those in Comparative Examples...

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Abstract

The present invention relates to a lithium secondary battery and, more particularly, to a lithium secondary battery having excellent life characteristics and penetration safety. The lithium secondarybattery of the present invention can have the effects of remarkably improving both lifetime characteristics and penetration safety, by combining a cathode active material comprising a metal having a concentration gradient section, with an anode and a separation film, the anode and the separation film each comprising a ceramic coating layer.

Description

technical field [0001] The present invention relates to lithium secondary batteries, and more particularly, to lithium secondary batteries having improved lifetime and puncture stability. Background technique [0002] With the rapid development of electronics, telecommunication and computer industries, portable electronic communication devices such as camcorders, mobile phones, notebook PCs, etc. have been significantly developed. Therefore, demand for a lithium secondary battery as a power source capable of driving the above-mentioned devices is also increasing. In particular, research and development of lithium secondary batteries have been carried out domestically and in countries such as Japan, Europe, and the United States in terms of environment-friendly power supplies applied to electric vehicles, uninterruptible power supplies, electric tools, satellites, etc. [0003] Among secondary batteries currently in use, lithium secondary batteries developed in the early 199...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/62H01M4/13H01M2/16H01M10/052H01M50/417H01M50/434H01M50/451H01M50/489
CPCH01M4/13H01M4/131H01M4/62H01M10/052H01M4/525H01M4/133H01M2004/021Y02E60/10H01M50/489H01M50/451H01M50/417H01M50/434H01M4/362H01M4/505H01M50/463H01M50/449H01M4/661H01M10/0525
Inventor 韩国炫刘炅傧黄德哲
Owner SK ON CO LTD