Unlock instant, AI-driven research and patent intelligence for your innovation.

Lithium secondary battery and method for manufacturing lithium secondary battery

A lithium secondary battery, lithiation technology, applied in secondary battery, electrolyte battery manufacturing, lithium battery, etc., to achieve high energy density, suppress internal short circuit, and improve safety effects

Pending Publication Date: 2021-11-19
LG ENERGY SOLUTION LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, Li dendrites grow more easily than when using any anode active material except Li metal, which becomes a very serious problem

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium secondary battery and method for manufacturing lithium secondary battery
  • Lithium secondary battery and method for manufacturing lithium secondary battery
  • Lithium secondary battery and method for manufacturing lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] 1. Preparation of an isolation layer with a volume expansion layer disposed thereon

[0135] First, Si (Sigma-Aldrich, 2 , and the barrier layer provided with the volume expansion layer showed an air permeability of 273 sec / 100 cc. Based on the volume before lithiation, the Si inorganic particles showed a volume expansion rate of 300% after lithiation. In addition, the inorganic particles were used in an amount of 80 parts by weight based on 100 parts by weight of the volume expansion layer.

[0136] 2. Preparation of negative electrode with protective layer

[0137] A pre-prepared binder solution of 5 wt% PVDF-HFP (5% HFP, Mw 800,000) was spin-coated on Li metal (thickness 20 μm, Honjo) at 2000 rpm for 1 min, and dried at room temperature for 12 h, thereby A Li negative electrode provided with a protective layer is obtained.

[0138] 3. Preparation of Cathode

[0139] First, LiNi as the positive electrode active material 0.8 co 0.1 mn 0.1 o 2 (NCM811), FX35 as ...

Embodiment 2

[0147] The isolation layer and the cell were obtained and evaluated in the same manner as in Example 1, except that the composition of the volume expansion layer was Si:PVDF=9:1. Here, the thickness of the volume expansion layer is 0.5 μm, and the loading amount is 1.01 g / m 2 , and the barrier layer provided with the volume expansion layer exhibited an air permeability of 258 sec / 100 cc. In addition, the inorganic particles were used in an amount of 90 parts by weight based on 100 parts by weight of the volume expansion layer.

Embodiment 3

[0149] Obtain and evaluate the isolation layer and the cell in the same manner as in Example 1, except that the volume expansion layer has a thickness of 1 μm and a loading capacity of 1.98 g / m 2 , and the barrier layer provided with the volume expansion layer exhibited an air permeability of 281 sec / 100 cc.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The present disclosure relates to a lithium secondary battery including a protective layer and a volume-expandable layer, a method for manufacturing the lithium secondary battery, and a system for evaluating the safety of the lithium secondary battery. According to the present disclosure, it is possible to inhibit growth of lithium dendrite primarily by forming a protective layer. It is also possible to inhibit growth of lithium dendrite secondarily by forming a volume-expandable layer. Therefore, it is possible to provide a lithium secondary battery fundamentally prevented from a short-circuit.

Description

technical field [0001] The present invention relates to a lithium secondary battery and a manufacturing method thereof. [0002] This application claims priority from Korean Patent Application No. 10-2019-0126329 filed in Korea on October 11, 2019, the disclosure of which is incorporated herein by reference. Background technique [0003] As vehicles, computers, and portable terminals are increasingly used, the importance of lithium secondary batteries has increased. In particular, there is an increasing need to develop lithium secondary batteries that are light in weight and high in energy density. [0004] Such a lithium secondary battery can be obtained by inserting a separator between a positive electrode and a negative electrode and filling it with a liquid electrolyte, or by inserting a separator containing a solid electrolyte instead of a liquid electrolyte between the positive and negative electrodes. [0005] Meanwhile, in lithium secondary batteries, lithium metal...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058H01M10/052H01M50/409H01M4/62Y02E60/10Y02P70/50H01M2004/027H01M10/4235H01M4/622H01M50/44H01M50/446H01M50/449H01M10/0585H01M4/134H01M50/457H01M50/489H01M50/431H01M4/628H01M50/491H01M50/572H01M4/1391H01M4/1395H01M4/505H01M4/525H01M4/623H01M2004/028H01M2220/20
Inventor 李廷弼金贵龙金恩妃
Owner LG ENERGY SOLUTION LTD