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Transition metal sulfide coated with carbon, preparation method and application

A transition metal and surface coating technology, applied in the field of transition metal sulfides, can solve problems such as battery short circuit and current collector corrosion, and achieve the effects of high battery capacity, good conductivity and good cycle stability

Inactive Publication Date: 2015-08-12
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the negative electrode composed of metal sulfide as the electrode active material and metal copper as the current collector will corrode the current collector during the long cycle charge and discharge process, and it is easy to generate metal dendrites to cause internal short circuit of the battery.

Method used

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  • Transition metal sulfide coated with carbon, preparation method and application
  • Transition metal sulfide coated with carbon, preparation method and application
  • Transition metal sulfide coated with carbon, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Dissolve 1g of CuS in 50mL of water, add 2g of glucose, transfer to a 100mL hydrothermal kettle, react for 24h, and calcinate at 500°C for 10h. Obtain the surface carbon-coated sulfur-copper compound, mix the prepared surface carbon-coated sulfur-copper compound 0.5g with 0.1071g acetylene black and 0.1071g polyvinylidene fluoride (PVDF), add an appropriate amount of N-methylpyrrolidone ( NMP) was dissolved, and the slurry was coated on the copper current collector to make an electrode. The test electrode was dried in a vacuum oven at 60°C for 12 hours, and the battery was assembled in a high-purity argon atmosphere glove box. The electrolyte is 1 mol of lithium bis(trifluoromethyl)sulfonylimide (LiTFSI) salt, and the solvent is 1,2-dimethoxyethane (DME) and 1,3-diox Pentacycline (DOL) mixed solution, lithium salt concentration is 1mol / L. A 2016 button battery was assembled with glass fiber filter paper as the liquid-absorbing membrane, Celgard 2400 membrane as the di...

Embodiment 2

[0058] Dissolve 1g of CuS in 50mL of water, add 1.5g of glucose, transfer to a 100mL hydrothermal kettle, react for 24h, and calcine at 500°C for 10h. Obtain the surface carbon-coated sulfur-copper compound, mix the prepared surface carbon-coated sulfur-copper compound 0.5g with 0.1071g acetylene black and 0.1071g polyvinylidene fluoride (PVDF), add an appropriate amount of N-methylpyrrolidone ( NMP) was dissolved, and the slurry was coated on the copper current collector to make an electrode. The test electrode was dried in a vacuum oven at 60°C for 12 hours, and the battery was assembled in a high-purity argon atmosphere glove box. The electrolyte is 1 mol of lithium bis(trifluoromethyl)sulfonylimide (LiTFSI) salt, and the solvent is 1,2-dimethoxyethane (DME) and 1,3-diox Pentacycline (DOL) mixed solution, lithium salt concentration is 1mol / L. A 2016 button battery was assembled with glass fiber filter paper as the liquid-absorbing membrane, Celgard 2400 membrane as the di...

Embodiment 3

[0061] Dissolve 1g of CuS in 50mL of water, add 1g of glucose, transfer to a 100mL hydrothermal kettle, react for 24h, and calcine at 500°C for 10h. Obtain the surface carbon-coated sulfur-copper compound, mix the prepared surface carbon-coated sulfur-copper compound 0.5g with 0.1071g acetylene black and 0.1071g polyvinylidene fluoride (PVDF), add an appropriate amount of N-methylpyrrolidone ( NMP) was dissolved, and the slurry was coated on the copper current collector to make an electrode. The test electrode was dried in a vacuum oven at 60°C for 12 hours, and the battery was assembled in a high-purity argon atmosphere glove box. The electrolyte is 1 mol of lithium bis(trifluoromethyl)sulfonylimide (LiTFSI) salt, and the solvent is 1,2-dimethoxyethane (DME) and 1,3-diox Pentacycline (DOL) mixed solution, lithium salt concentration is 1mol / L. A 2016 button battery was assembled with glass fiber filter paper as the liquid-absorbing membrane, Celgard 2400 membrane as the diap...

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Abstract

A transition metal sulfide coated with carbon, a preparation method and an application relate to transition metal sulfide. The transition metal sulfide coated with the carbon comprises a nucleus and a coating layer on the surface of the nucleus, wherein the nucleus is a transition metal sulfide nucleus, and the coating layer is a carbon coating layer. The preparation method comprises the steps as follows: dissolving the transition metal sulfide in water, adding a carbon source, and coating the surface of the transition metal sulfide with carbon. The transition metal sulfide coated with the carbon is applied to preparation of an electrode material, and the electrode material could be a battery electrode material or the like, and is specifically used as an electrode active material to be applied in a secondary battery. The transition metal sulfide coated with the carbon is greatly improved in conductive performance, further improved in charge and discharge capacity and rate capability, greatly improved in coulombic efficiency and cycle performance, and low in material cost and simple in preparation process. The composite material used as an electrode material of a secondary lithium battery has high energy density, excellent cyclicity, and especially excellent rate capability, and is safe and reliable.

Description

technical field [0001] The invention relates to a transition metal sulfide, in particular to a transition metal sulfide coated with carbon on the surface, a preparation method and its application as an electrode active material in a secondary battery. Background technique [0002] Lithium-ion secondary batteries are high-efficiency, high-energy-density electrical energy storage devices that have been widely used in small mobile electronic devices. Like other battery systems, lithium-ion batteries are mainly composed of four key materials: positive electrode materials, negative electrode materials, separators and electrolytes. The properties of materials have a very important relationship with the performance of lithium-ion batteries. At present, the cathode materials widely used in lithium-ion batteries are mainly transition metal oxides in which lithium ions can be intercalated and deintercalated reversibly, such as lithium cobaltate (LiCoO 2 ), ternary materials (LiNi 1 / 3...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/38H01M10/0525
CPCH01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 赵金保王昀晖李赫
Owner XIAMEN UNIV
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