Acryl binder for lithium-sulfur secondary battery cathode

A sulfur secondary battery and binder technology, which is applied in the positive electrode field of lithium-sulfur secondary batteries, can solve the problems of high solubility of lithium sulfide, low life characteristics and output characteristics, poor stability, etc., to ensure electrochemical characteristics, excellent Cycling characteristics, effect of preventing dissolution

Active Publication Date: 2018-01-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although lithium-sulfur secondary batteries have such advantages, there are still many problems such as high solubility of lithium polysulfide, low life characteristics and output characteristics, poor conductivity of sulfur, and poor stability due to the use of lithium metal

Method used

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  • Acryl binder for lithium-sulfur secondary battery cathode
  • Acryl binder for lithium-sulfur secondary battery cathode

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0134] [Resin production example 1] - Production of acrylic adhesive (A1)

[0135]In a 250 mL round bottom flask, charge 7.5 g of polyethylene oxide methyl ether methacrylate, 6.0 g of N-vinyl-2-pyrrolidone, 1.5 g of acrylonitrile, and 60 g of water, and seal the inlet. Oxygen was removed by nitrogen bubbling for 30 minutes, the reaction flask was immersed in an oil bath heated to 60° C., and then 0.03 g of V-50 (Wako Chemical) was added to initiate the reaction. When the monomer conversion rate was 87% within 24 hours, the reaction was terminated to obtain an acrylic adhesive having a weight average molecular weight of about 300,000.

manufacture example 2～4

[0136] [Resin production examples 2 to 4] Production of acrylic adhesives (A2, A3, A4)

[0137] An acrylic adhesive was prepared in the same manner as in Production Example 1 except that the kind and content of monomers used at the time of polymerization were adjusted as shown in Table 1 below.

[0138] [Table 1]

[0139]

Embodiment 1

[0140] [Example 1] Manufacture of lithium-sulfur secondary battery

[0141] A lithium-sulfur secondary battery was fabricated using a positive electrode having an active layer containing the acrylic binder (A1) prepared according to Production Example 1 above. Charge / discharge was evaluated by performing 50 cycles between 1.5V and 2.8V at 0.1C / 0.1C, and then the remaining capacity in the second cycle and the remaining capacity in the 50th cycle were calculated relative to the initial capacity. The remaining capacity was measured to measure the capacity retention rate, and the results are shown in Table 2.

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Abstract

The present application relates to a binder for a lithium-sulfur secondary battery cathode, and a composition containing the same. The binder of the present application enables a cathode active material electrolyte to have excellent resistance.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2015-0151132 filed on October 29, 2015, the contents of which are incorporated herein by reference in their entirety. technical field [0002] The invention relates to an acrylic binder for positive poles of lithium-sulfur secondary batteries, its composition, positive poles of lithium-sulfur secondary batteries and uses thereof. Background technique [0003] As the application fields of secondary batteries expand to electric vehicles (EV) or energy storage systems (ESS), etc., lithium-ion secondary batteries have reached the limit case with relatively low gravimetric energy storage density (~250 Wh / kg). [0004] Among next-generation secondary battery technologies capable of achieving high energy density, lithium-sulfur secondary batteries are attracting attention as high commercialization potential compared to other technologies. [0005] A lithium-sulfur s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/587H01M4/133H01M10/052
CPCH01M4/13H01M4/136H01M4/38H01M4/382H01M4/622H01M4/625H01M10/052H01M10/0525H01M2004/028Y02E60/10C08F22/22C08F22/30C08F22/36C08F22/1006H01M4/364H01M4/583H01M4/621H01M10/056
Inventor 尹正爱宋祈锡权起暎尹圣琇池汉娜梁斗景
Owner LG ENERGY SOLUTION LTD
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