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Lithium sulfur-lithium ion hybrid battery, cathode material for lithium sulfur-lithium ion hybrid battery and preparation method thereof

A technology of battery positive electrode and positive electrode material, applied in battery electrodes, electrode manufacturing, electrode heat treatment, etc., can solve the problems of poor cycle performance, low capacity, low theoretical battery capacity, etc., and achieve good stability, good conductivity, and enhanced capacity. exert the effect of stability

Inactive Publication Date: 2018-12-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of poor cycle performance, low capacity exertion, and low theoretical capacity of traditional commercial lithium-ion batteries in the prior art, the first purpose of the present invention is to provide a lithium-ion cathode material with sulfur Composite and conductive materials, etc., have high capacity, good stability and good conductivity Lithium-sulfur-lithium ion hybrid battery cathode material

Method used

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  • Lithium sulfur-lithium ion hybrid battery, cathode material for lithium sulfur-lithium ion hybrid battery and preparation method thereof
  • Lithium sulfur-lithium ion hybrid battery, cathode material for lithium sulfur-lithium ion hybrid battery and preparation method thereof
  • Lithium sulfur-lithium ion hybrid battery, cathode material for lithium sulfur-lithium ion hybrid battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Preparation of component sulfur (S), multi-walled carbon nanotubes (MCNT), and spincrystalline lithium titanate (LTO) composite positive electrode materials, the specific preparation process is as follows:

[0052] 200mg MCNT ultrasonic 1h dispersed in 20mL absolute ethanol, 79.3mg LiOH·H 2 O was dissolved in 30mL deionized water, added to the above MCNT suspension, 580.24mg of titanium sulfate was added to the above solution, stirred evenly, transferred to an autoclave, heated to 160°C, and after solvothermal reaction for 3 hours, transferred to a beaker The solvent was evaporated to dryness at 60°C, washed with deionized water, and then vacuum-dried at 100°C for 12 hours to obtain a black powder. The black powder was calcined at 300° C. for 12 hours in an air atmosphere to obtain a composite lithium titanate cathode material (MCNT / LTO). Weigh 300mg of MCNT / LTO and 450mg of sublimed sulfur, grind for half an hour, seal it in a tube furnace, and heat-treat it under arg...

Embodiment 2

[0056] Prepare the lithium battery positive electrode sheet with the same material ratio and thickness as in Example 1. The positive electrode sheet of the prepared lithium battery is assembled into a liquid button lithium battery by using the positive electrode sheet / carbonate electrolyte / lithium sheet, the charge and discharge cut-off voltage is 1-3V, and different rate charge and discharge tests are carried out at room temperature. The specific capacity of the first cycle of 0.2C discharge is 935mAhg -1 , after 10 cycles, the specific discharge capacity at 0.5C is 754.5mAhg -1 , after 20 cycles, the specific discharge capacity at 1C is 651.2mAhg -1 , after 30 cycles, the specific discharge capacity at 2C is 485mAhg -1 , when the rate gradually returns to 0.2C, the discharge specific capacity is 867mAhg after 20 cycles -1 , with an average Coulombic efficiency of 97.9%.

Embodiment 3

[0058] Preparation of component sulfur (S), graphene, spin crystal lithium titanate (LTO) composite positive electrode material, the specific preparation process is as follows:

[0059] 200mg of graphene was dispersed in 200mL of absolute ethanol by ultrasound for 1h, and 79.3mg of LiOH·H 2 O was dissolved in 30mL deionized water, added to the above graphene suspension, heated to 80°C, 1000rmin -1 Stir quickly, dissolve 755.59mg of n-butyl titanate in 30mL of absolute ethanol, add dropwise to the above solution, after the dropwise addition, place in a closed container and continue stirring for 2h, transfer to a beaker and evaporate the solvent to dryness at 60°C Vacuum drying at 100°C for 12 hours gave black powder. The black powder was calcined at 700° C. for 3 hours under an argon atmosphere to obtain a composite lithium titanate cathode material. Weigh 300 mg of graphene / LTO and 450 mg of sublimed sulfur, grind for half an hour, seal in a tube furnace, and heat-treat for ...

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Abstract

The invention discloses a lithium sulfur-lithium ion hybrid battery, a cathode material for the ithium sulfur-lithium ion hybrid battery and preparation method thereof. The organic dispersion containing conductive material, lithium source and metal source is subjected to solvothermal reaction, and the solvothermal reaction product is calcined and thermally melted with elemental sulfur to obtain acathode material with high capacity, good stability and good electrical conductivity. The charge-discharge cutoff voltage of Li-ion hybrid batteries meets the charge-discharge voltage requirements ofsulfur and lithium-ion cathode materials batteries. Compared with traditional lithium-sulfur batteries, the cycle stability is improved, and the capacity of batteries is greatly improved. In addition,the preparation method of the cathode material is simple, the process conditions are mild and the cost is low, which meets the requirements of industrial production.

Description

technical field [0001] The invention relates to a lithium-sulfur-lithium ion hybrid battery and its positive electrode material, in particular to a lithium-sulfur-lithium-ion hybrid battery with a wide charging and discharging voltage range, and a preparation method for the lithium-sulfur-lithium-ion hybrid battery. It belongs to the technical field of lithium batteries. Background technique [0002] Traditional commercial lithium-ion cathode materials have good electrical conductivity, long cycle life, and stable capacity, but their theoretical capacity is too low to meet the current requirements for high-energy-density batteries. As a lithium cathode material, sulfur has attracted widespread attention for its high theoretical specific capacity of 1675mAh / g and specific energy of 2600Wh / g. At the same time, elemental sulfur is cheap, resource-rich, and environmentally friendly, making it the development of high-energy-density lithium cathodes in the future. direction. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62
CPCH01M4/0416H01M4/0471H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/625Y02E60/10
Inventor 刘晋李劼杜英芦玉斌吴秀锋
Owner CENT SOUTH UNIV
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