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Silicon-containing lithium cathode, preparation method thereof and lithium sulfur battery with silicon-containing lithium cathode

A technology of lithium negative electrode and silicon negative electrode, which is applied in the field of chemical power sources, can solve the problems of not being able to provide lithium ions for lithium-sulfur batteries, and achieve the effects of improving battery cycle performance and safety performance, wide adjustable range, and reducing the amount of lithium metal used

Inactive Publication Date: 2012-09-26
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the silicon negative electrode itself does not contain a "lithium source", which cannot provide lithium ions that must be provided for the electrochemical reaction of lithium-sulfur batteries, and cannot form an electrochemical system with sulfur.

Method used

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  • Silicon-containing lithium cathode, preparation method thereof and lithium sulfur battery with silicon-containing lithium cathode
  • Silicon-containing lithium cathode, preparation method thereof and lithium sulfur battery with silicon-containing lithium cathode
  • Silicon-containing lithium cathode, preparation method thereof and lithium sulfur battery with silicon-containing lithium cathode

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Embodiment 1

[0022] Preparation of negative electrode sheet: Silicon / carbon composite material is used as the negative electrode material, mixed with conductive carbon black (Super P), sodium carboxymethyl cellulose (CMC), and styrene-butadiene rubber (SBR) in a mass ratio of 80:8:4:8 , using deionized water as a solvent, mixed to form a slurry, evenly coated on the current collector Cu foil, and then dried in a vacuum oven at 80 ° C for 24 hours. With metal lithium as the negative electrode, mesophase carbon microspheres as the positive electrode, Celgrad 2035 as the diaphragm, 1.5mol / L lithium hexafluorophosphate (LiPF 6 ) / Ethylene Carbonate (EC) + Diethyl Carbonate (DEC) + Ethyl Methyl Carbonate (EMC) (volume ratio 1:1:1) as the electrolyte to assemble the battery. The battery is first discharged-charged at a current density of 50mA / g active material, and the voltage range is 0.01-2V. After 8 cycles, the capacity of the silicon material reaches a stable level. The 9th lap continues to ...

Embodiment 2

[0024] Preparation of negative electrode sheet: Silicon / carbon composite material is used as the negative electrode material, mixed with conductive carbon black (Super P), sodium carboxymethyl cellulose (CMC), and styrene-butadiene rubber (SBR) in a mass ratio of 80:8:4:8 , using deionized water as a solvent, mixed to form a slurry, evenly coated on the current collector Cu foil, and then dried in a vacuum oven at 80 ° C for 24 hours. With metal lithium as the negative electrode, mesophase carbon microspheres as the positive electrode, Celgrad 2035 as the diaphragm, 1.5mol / L lithium hexafluorophosphate (LiPF 6 ) / Ethylene Carbonate (EC) + Diethyl Carbonate (DEC) + Ethyl Methyl Carbonate (EMC) (volume ratio 1:1:1) as the electrolyte to assemble the battery. The battery is first discharged-charged at a current density of 50mA / g active material, and the voltage range is 0.01~2V. After 8 cycles, the capacity of the silicon material is stable, and the stable lithium storage capacity...

Embodiment 3

[0026] Preparation of negative electrode sheet: Silicon / carbon composite material is used as the negative electrode material, mixed with conductive carbon black (Super P), sodium carboxymethyl cellulose (CMC), and styrene-butadiene rubber (SBR) in a mass ratio of 80:8:4:8 , using deionized water as a solvent, mixed to form a slurry, evenly coated on the current collector Cu foil, and then dried in a vacuum oven at 80 ° C for 24 hours. With lithium metal as the negative electrode, mesophase carbon microspheres as the positive electrode, Celgrad 2035 as the separator, 1.5mol / L lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) / dioxolane (DOL)+1, 2-Dimethoxyethane (DME) (volume ratio 1:1) is used as the electrolyte to assemble the battery. The battery is first discharged-charged at a current density of 50mA / g active material, and the voltage range is 0.01~2V. After 8 cycles, the capacity of the silicon material is stable, and the stable lithium storage capacity of the 8th cycle i...

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Abstract

The invention relates to a silicon-containing lithium cathode, a preparation method thereof and a lithium sulfur battery with the silicon-containing lithium cathode. The preparation method of the lithium cathode comprises the steps of: 1) mixing a silicon-containing cathode material with conducting agent and binder, coating the mixture on a current collector and drying the current collector to obtain a silicon-containing pole piece; using the silicon-containing pole piece as an anode and a metal lithium piece as a cathode, assembling a battery, and conducting a discharge-charge cycle within 0.01-2V at current density of 10-1000mA / g to obtain a silicon-containing lithium cathode piece with lithium which is electrochemically prestored; and 2) continuously discharging the battery which is discharged to 0.01V and is subject to a lithium storage step to obtain a silicon-containing lithium cathode piece with lithium which is electrochemically and excessively deposited. Since a high-capacity silicon-containing cathode material is used as a carrier and a lithium source is replenished through an electrochemical method, compared with the traditional lithium foil cathode, the silicon-containing lithium cathode for the lithium sulfur battery provided by the invention has the advantages that the specific area is larger, the probability of forming dendritic crystals is reduced, the amount of used metal lithium is decreased and the cycle performance and the safety performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to a method for preparing a silicon-containing lithium negative electrode and a lithium-sulfur battery containing the negative electrode. Background technique [0002] Lithium-sulfur battery is a high-energy-density secondary green chemical power source that has attracted much attention and invested a lot of research in recent years. The electrochemical reaction of a lithium-sulfur battery with elemental sulfur as the positive electrode is as follows: S 8 +Li?Li 2 S x (1≤ x ≤8)?Li 2 S. According to the final reduction reaction product Li 2 S calculation, the theoretical specific capacity of elemental sulfur is 1672mAh / g, metal lithium has a theoretical specific capacity of 3860mAh / g, and the theoretical energy density of Li / S redox pair is as high as 2600Wh / kg. Lithium-sulfur batteries are characterized by high energy density and have the potential ...

Claims

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Application Information

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IPC IPC(8): H01M4/40H01M4/1395H01M10/052
CPCY02E60/122Y02E60/10
Inventor 郭瑞刘雯李永解晶莹丰震河
Owner SHANGHAI INST OF SPACE POWER SOURCES
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