Lithium metal negative electrode and lithium metal battery comprising same

A lithium metal negative electrode and lithium metal battery technology, applied in the direction of lithium batteries, negative electrodes, battery electrodes, etc., can solve problems such as fire and explosion, shortened life of lithium metal batteries, internal short circuit of lithium metal batteries, etc.

Pending Publication Date: 2021-04-30
LG ENERGY SOLUTION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the negative electrode active material capable of participating in the electrochemical reaction is gradually lost, whereby the Coulombic efficiency decreases and the lifetime of the lithium metal battery may be shortened
[0008] In addition, Li dendrites grown from the surface of the Li metal anode penetrate the separator and reach the cathode, and may cause an internal short circuit of the Li metal battery, which is directly related to safety issues such as fire and explosion.

Method used

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  • Lithium metal negative electrode and lithium metal battery comprising same
  • Lithium metal negative electrode and lithium metal battery comprising same
  • Lithium metal negative electrode and lithium metal battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 3

[0108] (1) Preparation of poly(ALA-S)

[0109] Preparation of α-lipoic acid (ALA) powder and sulfur molecule (S 8 ) The weight ratio of the powder is each mixture of 8:2 (Example 1), 5:5 (Example 2) and 3:7 (Example 3), and then the internal temperature is controlled at 160 ° C with an inert gas atmosphere Heat treatment in the reactor for 3 hours.

[0110] The polymers thus obtained are collectively referred to as poly(ALA-S). In addition, according to the mixing ratio of raw materials, poly(ALA:S 8 )_x:y, where x:y corresponds to ALA and S in the manufacturing raw materials 8 weight ratio. Specifically, poly(ALA:S 8 )_8:2 is the polymer of Example 1, poly(ALA:S 8 )_5:5 is the polymer of Example 2, poly(ALA:S 8 )_3:7 is the polymer of Example 3.

[0111] (2) Preparation of a separator surface coated with poly(ALA-S)

[0112] Three separators (width: 4.5 cm*length: 4.5 cm*thickness: 25 μm, porosity: 41% by volume) made of polypropylene (pp) material were prepared....

experiment example 1

[0143] Experimental Example 1: Evaluation of the chemical formula and structure of the polymer (poly(ALA-S)) of Examples 1 to 3

[0144] 1) Elemental analysis

[0145] The polymers (poly(ALA-S)) of Examples 1 to 3 and the polymer of Comparative Example 1 (poly(ALA)) were respectively analyzed by an elemental analyzer (EA), and the results are shown in Table 1 below.

[0146] [Table 1]

[0147]

[0148] From Table 1, the chemical formulas of the polymer (poly(ALA-S)) of Examples 1 to 3 and the polymer of Comparative Example 1 (poly(ALA)) could be determined. It was confirmed that the chemical formula of poly(ALA) obtained by heat-treating only ALA (Comparative Example 1) was C 8 h 13.88 o 2.10 S 1.93 , and its sulfur mole fraction corresponds to a value close to the theoretical value of 2.

[0149] On the other hand, for ALA and S 8 In the poly(ALA-S) (Examples 1 to 3) obtained by heat-treating the mixture of C 8 h 13.10 o 1.86 S 4.11 (Example 1), C 8 h 13.1...

experiment example 2

[0153] Experimental example 2: the membrane of embodiment 1 to 3 (poly(ALA: S 8 )_x:y_ppx2) surface observation and ion conductivity evaluation price

[0154] 1) Surface observation

[0155] For the separator (poly(ALA:S8)_x:y_ppx2) of Examples 1 to 3 and the separator (poly(ALA)_ppx2) of Comparative Example 1, take pictures with a digital camera (Galaxy S9) respectively, as shown in Figure 3a , and then photographed with a scanning electron microscope (SEM), shown in Figure 3b middle.

[0156] exist Figure 3a and 3b , it can be seen that both poly(ALA) (Comparative Example 1) and poly(ALA-S) (Examples 1 to 3) can be uniformly coated on one surface of the separator.

[0157] 2) Ionic conductivity analysis

[0158] For the membranes of Examples 1 to 3 (poly(ALA:S 8 )_x:y_ppx2) and the diaphragm (poly(ALA)_ppx2) of Comparative Example 1, using a SUS symmetrical cell to analyze the ionic conductivity.

[0159] Specifically, for the SUS symmetric cell manufactured...

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Abstract

The invention relates to a lithium metal negative electrode and a lithium metal battery including the same. The lithium metal negative electrode according to an embodiment of the present invention comprises a protective layer for stabilizing a space between a lithium metal and an electrolyte, the protective layer comprising: a polymer of alpha-lipoic acid (ALA) and sulfur molecules (S8); a depolymerization product of the polymer; an inorganic sulfide-based compound; and an inorganic nitride-based compound, an inorganic nitrate-based compound, or a mixture thereof.

Description

[technical field] [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2019-0085902 filed with the Korean Intellectual Property Office on July 16, 2019, the disclosure of which is hereby incorporated by reference in its entirety. [0003] The invention relates to a lithium metal negative electrode and a lithium metal battery comprising the same. [Background technique] [0004] Lithium metal batteries are secondary batteries using lithium metal (Li-metal) as the negative electrode active material, and can exhibit high theoretical capacity (3860 mAh / g) and low standard reduction potential (-3.040 V vs. SHE). Therefore, lithium metal batteries have attracted much attention as next-generation batteries replacing lithium-ion batteries using carbon-based negative active materials such as graphite. [0005] However, due to the high reactivity of Li metal, low Coulombic efficiency, short lifetime, and low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M4/134H01M10/058H01M10/052
CPCH01M10/4235H01M4/134H01M10/058H01M10/052Y02E60/10Y02P70/50H01M4/366H01M4/62H01M10/0567H01M10/0568H01M10/0569H01M4/0471H01M50/449H01M50/403H01M2300/0037H01M4/382H01M50/46H01M50/414H01M4/1395H01M4/04H01M2004/027H01M4/0404H01M4/5815H01M4/661H01M10/0525H01M2300/0028
Inventor 尹钟建金允贞尹泫雄黄善宇河会珍金熙卓卢泳日
Owner LG ENERGY SOLUTION LTD
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