Positive electrode material of lithium-sulfur battery, preparation method thereof and lithium-sulfur battery

A lithium-sulfur battery and cathode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor conductivity of cathode materials, polysulfide shuttle effect, sulfur cathode volume effect, and reduction of cathode material volumetric energy density.

Active Publication Date: 2018-06-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although lithium-sulfur batteries have the great advantage of high energy density, there are always some difficult problems in lithium-sulfur batteries: the poor conductivity of cathode materials, the shuttle effect of polysulfides, and the volume effect of sulfur cathodes
However, there are always some problems in these composite methods, such as the introduction of carbon and polymers will reduce the volumetric energy density of positive electrode materials.

Method used

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  • Positive electrode material of lithium-sulfur battery, preparation method thereof and lithium-sulfur battery
  • Positive electrode material of lithium-sulfur battery, preparation method thereof and lithium-sulfur battery
  • Positive electrode material of lithium-sulfur battery, preparation method thereof and lithium-sulfur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0044]A cobaltate loaded sulfur-lithium-sulfur battery composite positive electrode material, specifically prepared according to the following steps:

[0045] Step 1, magnesium cobaltate (MgCo 2 o 4 ) preparation:

[0046] Measure 10 mL of deionized water and 40 mL of absolute ethanol and mix evenly.

[0047] Weigh 0.5 mmol of cobalt acetate and 0.25 mmol of magnesium acetate, add them to the above mixed solution, and continue stirring to dissolve.

[0048] Add 0.5 mL of 25% aqueous ammonia dropwise.

[0049] The mixed solution was transferred to a 100 mL hydrothermal reactor and placed in an oven at 200 °C for 15 h.

[0050] The hydrothermal reaction product was centrifugally washed with deionized water and ethanol three times each, and placed in a vacuum drying oven at a temperature of 60 °C with a vacuum degree of -0.1 MPa.

[0051] The dried material was placed in a muffle furnace at 500 °C for 2 h to obtain magnesium cobaltate.

[0052] Step 2, the magnesium cobalta...

Embodiment 2

[0057] A copper cobaltate loaded sulfur-lithium-sulfur battery composite positive electrode material, specifically prepared according to the following steps:

[0058] Step 1, copper cobaltate (CuCo 2 o 4 ) preparation:

[0059] Measure 10 mL of deionized water and 40 mL of absolute ethanol and mix evenly.

[0060] Weigh 0.5 mmol of cobalt acetate and 0.25 mmol of copper acetate, add them to the above mixed solution, and continue stirring to dissolve.

[0061] Add 0.7 mL of 25% aqueous ammonia dropwise.

[0062] The mixed solution was transferred to a 100 mL hydrothermal reactor and placed in an oven at 150 °C for 24 h.

[0063] The hydrothermal reaction product was centrifugally washed with deionized water and ethanol three times each, and placed in a vacuum drying oven at a temperature of 60 °C with a vacuum degree of -0.1 MPa.

[0064] The dried material was placed in a muffle furnace at 450 °C for 3 h to obtain copper cobaltate.

[0065] Step 2, the copper cobaltate o...

Embodiment 3

[0070] A nickel-cobaltate-loaded sulfur-lithium-sulfur battery composite cathode material, specifically prepared according to the following steps:

[0071] Step 1, nickel cobaltate (NiCo 2 o 4 ) preparation:

[0072] Measure 10 mL of deionized water and 40 mL of absolute ethanol and mix evenly.

[0073] Weigh 0.5 mmol of cobalt acetate and 0.25 mmol of nickel acetate, add them to the above mixed solution, and continue stirring to dissolve.

[0074] Add 1 mL of 25% aqueous ammonia dropwise.

[0075] The mixed solution was transferred to a 100 mL hydrothermal reactor and placed in an oven at 200 °C for 24 h.

[0076] The hydrothermal reaction product was centrifugally washed with deionized water and ethanol three times each, and placed in a vacuum drying oven at a temperature of 60 °C with a vacuum degree of -0.1 MPa.

[0077] The dried material was placed in a muffle furnace at 500 °C for 3 h to obtain nickel cobaltate.

[0078] Step 2, the nickel cobaltate obtained in st...

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Abstract

The invention provides a positive electrode material of a lithium-sulfur battery, a preparation method thereof and the lithium-sulfur battery. The positive electrode material of the lithium-sulfur battery is a composite material formed by cobaltates (magnesium cobaltate, nickel cobaltate, copper cobaltate and zinc cobaltate) and elemental sulfur. The content of the elemental sulfur is 60-90wt%. The cobaltates provided by the invention have extremely-strong adsorbing action on polysulfide, and have the effects of effectively inhibiting dissolving of lithium polysulfide in ether electrolyte, relieving a shuttling effect in charging and discharging processes of the battery, reducing the capacity attenuation of the lithium-sulfur battery and prolonging the service life of the battery. The lithium-sulfur battery provided by the invention has the beneficial effects that under 0.1C current, the initial discharging capacity is 955mAh/g(calculated according to the composite material), the capacity is 722mAh/g after 100-time circulation, and the capacity retention ratio is 75.6%.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a lithium-sulfur battery cathode material and a preparation method thereof, and a lithium-sulfur battery using the cathode material. Background technique [0002] Chemical power sources (batteries) can realize mutual conversion between chemical energy and electrical energy, among which Zn-MnO 2 The battery is a primary battery, and the lead-acid battery, nickel-cadmium battery and lithium-ion battery are secondary batteries. Lithium-ion batteries are currently the most widely used, but their ultimate mass energy density is 300 Wh / kg, which can no longer meet people's needs. It is imperative to develop a new high-energy-density secondary battery system. From an electrochemical point of view, the multi-electron reaction system is the basis for constructing high specific energy secondary batteries. Elemental sulfur is a light, abundant, and cheap substance that can theoretically achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/525H01M10/0525
CPCH01M4/131H01M4/364H01M4/525H01M10/0525Y02E60/10
Inventor 高学平刘亚涛李国然刘胜
Owner NANKAI UNIV
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