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Carbon-doped lithium ferromanganese phosphate sulfur-supported lithium sulfur battery cathode material and preparation method thereof

A technology for lithium iron manganese phosphate and lithium sulfur batteries, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of low battery capacity retention and weak physical adsorption, and achieve the suppression of shuttle effect, Effect of high capacity and improved utilization

Inactive Publication Date: 2019-01-04
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The study found that due to the excellent electronic conductivity of carbon materials, when used as a sulfur positive electrode carrier material, the utilization rate of sulfur can be improved to a certain extent, and at the same time, its rich pores can physically adsorb lithium polysulfide, so it can be used in a certain To a certain extent, the cycle performance is improved, but this physical adsorption is weak, resulting in a low capacity retention rate in the long cycle of the battery

Method used

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  • Carbon-doped lithium ferromanganese phosphate sulfur-supported lithium sulfur battery cathode material and preparation method thereof
  • Carbon-doped lithium ferromanganese phosphate sulfur-supported lithium sulfur battery cathode material and preparation method thereof
  • Carbon-doped lithium ferromanganese phosphate sulfur-supported lithium sulfur battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1, LiFe 0.6 mn 0.4 PO 4 / C-loaded sulfur-lithium-sulfur battery composite cathode material, prepared by high-temperature solid-state method:

[0043] Weigh 6.36g iron hydroxide Fe(OH) 3 , 6.92g manganese acetate C 4 h 6 MnO 4 4H 2 O, 7.2g sucrose C 12 h 22 o 11 , 5.2g lithium dihydrogen phosphate LiH 2 PO 4 Grind and mix evenly, place in a 100mL ball mill jar, add 50mL of acetone, and grind at 300r min -1 Wet ball milling for 2 hours, dried in a vacuum oven at 60°C for 12 hours; then placed in a tube furnace, under an argon atmosphere, at 3°C ​​min -1 The temperature was raised to 350°C for 3 hours, and then at 3°C ​​min -1 The temperature was raised to 750 ° C for 12 hours, and LiFe was obtained after natural cooling. 0.6 mn 0.4 PO 4 / C-1 Composite.

[0044] Step 2, the LiFe obtained in step 1 0.6 mn 0.4 PO 4 / C-1 matrix material and sulfur simple substance are compounded by melting method:

[0045] LiFe 0.6 mn 0.4 PO 4 / C-1 and sulfur elem...

Embodiment 2

[0047] Step 1, LiFe 0.6 mn 0.4 PO 4 / C-loaded sulfur-lithium-sulfur battery composite cathode material, prepared by sol-gel thermal method:

[0048] Weigh 6.36g iron hydroxide Fe(OH) 3 , 6.92g manganese acetate C 4 h 6 MnO 4 4H 2 O, 14.5g sucrose C 12 h 22 o 11 and 5.2 g lithium dihydrogen phosphate LiH 2 PO 4 Dissolve in 50mL deionized water to form solution B, adjust the pH to form a gel, dry the gel, keep it at 750°C for 12h, and obtain LiFe after natural cooling 0.6 mn 0.4 PO4 / C-2 Composite.

[0049] Step 2, the LiFe obtained in step 1 0.6 mn 0.4 PO 4 / C-2 matrix material and sulfur simple substance are compounded by melting method:

[0050] LiFe 0.6 mn 0.4 PO 4 / C-2 and sulfur element are mixed at a mass ratio of 20:80, ground and mixed evenly, transferred to a reaction kettle, sealed under an argon atmosphere, placed in a muffle furnace, and kept at 155°C for 12 hours; finally cooled to room temperature, the lithium-sulfur battery composite cathode ...

Embodiment 3

[0052] Step 1, LiFe 0.6 mn 0.4 PO 4 / C-loaded sulfur-lithium-sulfur battery composite cathode material, prepared by water-solvothermal method:

[0053] Weigh 6.36g iron hydroxide Fe(OH) 3 , 6.92g manganese acetate C 4 h 6 MnO 4 4H 2 O, 14.5g sucrose C 12 h 22 o 11 , 5.2g lithium dihydrogen phosphate LiH 2 PO 4 Dissolve in 50mL deionized water, stir and place in a reactor, place in a 100mL reactor at 180°C for 12 hours, and obtain LiFe after natural cooling 0.6 mn 0.4 PO 4 / C-3 Composite.

[0054] Step 2, the LiFe obtained in step 1 0.6 mn 0.4 PO 4 / C-3 matrix material and sulfur simple substance are compounded by melting method:

[0055] LiFe 0.6 mn 0.4 PO 4 / C-3 and sulfur element are mixed at a mass ratio of 20:80, ground and mixed evenly, transferred to a reaction kettle, sealed under an argon atmosphere, placed in a muffle furnace, and kept at 155°C for 12 hours; finally cooled to room temperature, the lithium-sulfur battery composite cathode material...

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Abstract

The invention relates to a carbon-doped lithium ferromanganese phosphate sulfur-loaded lithium sulfur battery cathode material, which is composed of elemental sulfur and LiFe0.6Mn0.4PO4 / C as carrier material. The mass ratio of sulfur to LiFe0.6Mn0. 4PO4 / C is 50: 50 - 80: 20, and the content of doped carbon in LiFe0. 6Mn0. 4PO4 / C is 5 - 30wt%. The polar adsorption of LiFe (0.6)Mn(0.4)PO(4) / C on Li2S can restrain the shuttle effect of Li2S greatly. The polar adsorption of LiFe(0.6)Mn(0.4)PO(4) / C on Li2S can restrain the shuttle effect of Li2S. At the same time, carbon doping improves the electronic conductivity of the composite cathode material, which is conducive to improving the utilization rate of sulfur, so as to obtain the cathode material of a lithium-sulfur battery with both high capacity and high cycle stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery electrode materials, in particular to a lithium-sulfur battery composite positive electrode material and a preparation method thereof, which use carbon-doped iron manganese phosphate lithium to load sulfur. Background technique [0002] With the development of society and economy, the increase of energy consumption urgently requires the continuous improvement of new energy technology. Lithium-ion batteries have attracted people's attention because of their convenience and reliability, which has also prompted the maturity of their preparation technology. The currently used positive and negative electrode materials for lithium-ion batteries have been able to meet the requirements of higher safety, longer cycle life and higher tap density. However, the energy density of the battery is difficult to exceed 350Wh kg due to the lithium-ion deintercalation mechanism and the influence of pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525H01M4/13
CPCH01M4/13H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 高学平王璐李国然刘胜
Owner NANKAI UNIV