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Electrode and lithium secondary battery comprising same

一种锂二次电池、电极的技术，应用在锂蓄电池、非水电解质蓄电池、正电极等方向，能够解决电池寿命特性和倍率性能下降、电子迁移困难、难商业化等问题，达到优异电极反应性、提高初始容量、提高寿命特性的效果

Active Publication Date: 2020-02-14
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, sulfur used as a positive electrode active material of a lithium-sulfur battery is a non-conductive material, and thus there are problems in that the transfer of electrons generated by an electrochemical reaction is difficult, polysulfide (Li 2 S 8 ~ Li 2 S 4 ) dissolution, and due to sulfur and lithium sulfide (Li 2 S 2 / Li 2 The low conductivity of S) leads to low kinetics of the electrochemical reaction, thus deteriorating battery life characteristics and rate performance
[0008] However, noble metal catalysts such as platinum are expensive and thus difficult to commercialize, and in addition, due to the possibility of poisoning due to the redox reaction of sulfur during charge and discharge, there is a possibility that it is not easy to use as a cathode material for lithium-sulfur batteries The problem
[0009] As mentioned above, the use of catalysts to improve the performance of lithium-sulfur batteries has limitations

Method used

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  • Electrode and lithium secondary battery comprising same
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  • Electrode and lithium secondary battery comprising same

Examples

Experimental program
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Effect test

preparation example 1

[0078] Preparation Example 1: Synthesis of Additives for Pore Formation

[0079] Infiltration of pitch as carbon precursor material into non-spherical SiO containing interconnected pores 2 In the pores of the mold, the pitch is then carbonized at a temperature of 700°C to form a porous composite.

[0080] Afterwards, the porous composite was added to a hydrofluoric acid bath to remove SiO 2 A mould, whereby additives for forming pores are synthesized in the form of a porous carbon product.

[0081] The synthesized porous carbon product has a porosity of more than 50%, and has an average particle diameter (D50) of 4 μm.

Embodiment 1

[0082] Example 1: Manufacture of positive pole and lithium-sulfur battery comprising said positive pole

[0083] Prepare a sulfur-carbon composite material as a positive electrode active material with a ratio of 7:3, and by adding 88% by weight of sulfur-carbon composite material, 5% by weight of carbon black as a conductive material, and 5% by weight of carbon black as a binder After the positive electrode mixture of styrene-butadiene rubber-carboxymethylcellulose (SBR-CMC) and 2% by weight of the additive for forming pores in Preparation Example 1 was added to water as a solvent to prepare the positive electrode slurry, the positive electrode The slurry was coated on an aluminum foil current collector and was charged at 5mAh / cm 2 preparation of positive electrodes.

[0084] Lithium foil with a thickness of 200 μm was used as the negative electrode with 2 wt% LiNO 3 An organic solution in which additives were dissolved in 1M LiTFSI (DME / DOL, 1:1 volume ratio) was used as th...

Embodiment 2

[0088] Example 2: Manufacture of positive pole and lithium-sulfur battery comprising said positive pole

[0089] Prepare a sulfur-carbon composite material as a positive electrode active material with a ratio of 7:3, and by adding 85% by weight of sulfur-carbon composite material, 5% by weight of carbon black as a conductive material, and 5% by weight of carbon black as a binder After the positive electrode mixture of styrene-butadiene rubber-carboxymethyl cellulose (SBR-CMC) and 5% by weight of the additive for forming pores in Preparation Example 1 was added to water as a solvent to prepare the positive electrode slurry, the positive electrode The slurry was coated on an aluminum foil current collector and was charged at 5mAh / cm 2 preparation of positive electrodes.

[0090] Lithium foil with a thickness of 200 μm was used as the negative electrode with 2 wt% LiNO 3 An organic solution in which additives were dissolved in 1M LiTFSI (DME / DOL, 1:1 volume ratio) was used as t...

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Abstract

The present invention relates to an electrode and a lithium secondary battery comprising the same, wherein the porosity of the electrode is increased by an additive for forming pores such that the electrode reactivity at a high degree of loading and the initial capacity of the electrode can be improved.

Description

technical field [0001] This application claims priority over Korean Patent Application No. 10-2017-0084684 filed with the Korean Intellectual Property Office on July 4, 2017 and Korean Patent Application No. 10-2018-0073277 filed with the Korean Intellectual Property Office on June 26, 2018 rights and interests, the entire contents of these Korean patent applications are incorporated herein by reference. [0002] The present invention relates to an electrode for improving the capacity and reactivity of a lithium secondary battery and a lithium secondary battery including the electrode. Background technique [0003] Until recent years, there has been considerable interest in developing high energy density batteries using lithium as the negative electrode. For example, compared to other electrochemical systems with lithium-intercalated carbon electrodes and nickel or cadmium electrodes that increase the weight and volume of the negative electrode due to the presence of non-el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/134H01M4/62H01M10/052H01M4/38H01M4/36H01M4/02H01M4/136H01M4/58
CPCH01M4/38H01M10/052H01M2004/021H01M4/622H01M4/623H01M4/625H01M4/624H01M4/136H01M4/364H01M4/5815Y02E60/10H01M4/13H01M4/134H01M4/62H01M4/362H01M2004/028
Inventor 赵恩京金伦耕孙权男梁斗景
Owner LG ENERGY SOLUTION LTD