Anode for lithium secondary battery comprising mesh-shaped insulating layer, and lithium secondary battery comprising same

一种锂二次电池、绝缘层的技术，应用在二次电池、二次电池维修/保养、锂蓄电池等方向，能够解决操作性质差、电流分布不均匀、塌陷等问题，达到抑制电池体积膨胀、抑制锂枝晶形成、防止脱嵌和塌陷的效果

Active Publication Date: 2018-11-23
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This layer leads to deintercalation and collapse of the passivation layer with successive charge and discharge cycles of the lithium metal battery and, due to the additional generation of the passivation layer in the gaps created by this phenomenon, can lead to the formation of the so-called Deterioration of battery life characteristics due to "deactivation of lithium (deactivation Li)"
In addition, the passivation layer induces local current density differences, making dendrite-like Li dendrites formed while the current distribution is inhomogeneous during charging.
In addition, when the dendrites formed above continue to grow and penetrate the separator to contact the positive electrode, an internal short circuit will occur, causing the battery to explode.
[0007] Second, lithium is an alkali metal and has high reactivity with moisture, and even when the electrolyte contains moisture at the level of several ppm, heat and gas may be generated by reacting with moisture, thereby causing battery stability due to internal expansion of the battery question
Third, lithium is highly soft and has weak mechanical strength, and the handling properties are too poor to be used without additional surface treatment
However, these studies had little effect on the inhibition of lithium dendrites

Method used

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  • Anode for lithium secondary battery comprising mesh-shaped insulating layer, and lithium secondary battery comprising same
  • Anode for lithium secondary battery comprising mesh-shaped insulating layer, and lithium secondary battery comprising same

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example

[0066] Hereinafter, Examples, Comparative Examples, and Experimental Examples are described to clarify the effects of the present invention. However, the following descriptions are just some examples of the contents and effects of the present invention, and the scope of rights and effects of the present invention are not limited thereto.

Embodiment 1

[0068] Embodiment 1-Manufacture of lithium secondary battery

[0069] A lithium secondary battery is fabricated using a lithium metal anode, an organic liquid electrolyte, and an NCM cathode. To prepare the positive electrode, poly(vinylidene fluoride) (PVdF) used as a binder was dissolved in N-methylpyrrolidone, and then the conductive material Super-P carbon and the active material LiNi 0.8 co 0.15 al 0.05 o 2 Quantify and introduce into it, and stir the resultant. Herein, the weight ratio of the positive electrode active material, the conductive material and the binder is 85:7.5:7.5. After coating the thoroughly mixed slurry solution on the aluminum current collector and drying the resultant, a lamination process was performed using a roller press. This is to improve the mutual adhesive strength of the active material / conductive material / binder and effectively bind these materials to the current collector. After the pressing process, electrodes of appropriate size wer...

Embodiment 2

[0073] A lithium secondary battery was fabricated in the same manner as in Example 1 except that an insulating layer having mesh pores of 20 μm was used.

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Abstract

The present invention relates to an anode for a lithium secondary battery comprising a mesh-type insulating layer and a lithium secondary battery comprising the same and, more particularly, to an anode for a lithium secondary battery comprising a mesh-type insulating layer which is formed on one surface of a lithium metal layer and has pores, and a lithium secondary battery comprising the same. Alithium secondary battery to which the anode according to the present invention is applied induces the precipitation and elimination reactions of lithium dendrite inside the pores of the insulating layer to suppress the local formation of the lithium dendrite on a lithium metal surface and form a uniform surface, thereby suppressing a volume expansion of a cell. In addition, the lithium secondarybattery forms a support layer on an initially formed passivation film to prevent desorption and collapse of the passivation film, such that an additional side reaction with an electrolyte is suppressed and dead lithium is minimized, thereby improving the lifetime properties of the battery.

Description

technical field [0001] This application claims Korean Patent Application No. 10-2016-0124458 filed with the Korean Intellectual Property Office on September 28, 2016 and Korean Patent Application No. 10-2017-0125228 filed with the Korean Intellectual Property Office on September 27, 2017 Interest, the disclosure of which is incorporated herein by reference. [0002] The present invention relates to a lithium secondary battery negative electrode comprising a mesh insulating layer and a lithium secondary battery comprising the negative electrode, in particular to a mesh insulating layer formed on one surface of a lithium metal layer and having holes A negative electrode for a lithium secondary battery and a lithium secondary battery including the negative electrode. Background technique [0003] With the growth of the IT mobile market, the demand for secondary batteries is increasing, and the application of secondary batteries is gradually expanding to electric vehicles and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M10/052H01M10/42
CPCH01M4/134H01M4/366H01M4/382H01M4/405H01M10/4235H01M10/052H01M4/62Y02E60/10H01M4/74H01M2004/027H01M2004/028
Inventor 尹泫雄李钟和
Owner LG ENERGY SOLUTION LTD
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