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Preparation of rare earth metal-tin sulfide/grapheme negative electrode material for lithium ion batteries

A lithium-ion battery, graphene negative electrode technology, applied in battery electrodes, circuits, inorganic chemistry and other directions, can solve the problems of reducing electrode cycle life, irreversible capacity increase, poor cycle performance, etc., to avoid capacity decay too fast, The effect of considerable capacity and good cycle performance

Inactive Publication Date: 2013-02-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the pure phase SnS prepared in the literature 2 Has the following deficiencies: SnS 2 The first discharge capacity of the electrode and the retention capacity after cycling are low (i.e. poor cycle performance)
This is due to the expansion and contraction of the volume of tin during the charge-discharge cycle, which causes the crystal grains to break and the structure to collapse, leading to the destruction of the electrode and reducing the cycle life of the electrode, and it is easy to "agglomerate" during the lithium-deintercalation reaction. , leading to an increase in the initial irreversible capacity

Method used

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  • Preparation of rare earth metal-tin sulfide/grapheme negative electrode material for lithium ion batteries
  • Preparation of rare earth metal-tin sulfide/grapheme negative electrode material for lithium ion batteries
  • Preparation of rare earth metal-tin sulfide/grapheme negative electrode material for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) SnCl with a molar ratio of 2:0.1:6:0.1 4 ·5H 2 O: Ce(NO 3 ) 3 ·6H 2 O: CH 3 CSNH 2 : CTAB is dissolved in a mixed solution of water and ethanol;

[0025] (2) In the mixed solution, add an aqueous solution containing 0.06 g of graphene oxide, and continue to stir until it is completely dissolved;

[0026] (3) Transfer the mixture to a polytetrafluoroethylene-lined hydrothermal reactor and react at 180°C for 36 hours;

[0027] (4) Centrifuge the product, wash it, put it into an oven, and dry it at 60°C to obtain a precursor;

[0028] (5) Heat treatment process: the precursor was sintered in a tube furnace at 500°C for 2h under the protection of argon to obtain Ce-SnS 2 / graphene material.

[0029] The product in Example 1 was assembled into a CR2016 button battery, with a lithium sheet (Φ=16 purity>99.9%) as the counter electrode, a polypropylene porous membrane (Φ=18) as the separator, and a LiPF 6 A mixed solution of ethylene carbonate (EC) and dimethyl ca...

Embodiment 2

[0031] (1) SnCl with a molar ratio of 2:0.1:6:0.1 4 ·5H 2 O: Ce(NO 3 ) 3 ·6H 2 O: CH 3 CSNH 2 : CTAB is dissolved in a mixed solution of water and ethanol;

[0032] (2) In the mixed solution, add an aqueous solution containing 0.12 g of graphene oxide, and continue stirring until it is completely dissolved;

[0033] (3) Transfer the mixture to a polytetrafluoroethylene-lined hydrothermal reactor and react at 180°C for 36 hours;

[0034] (4) Centrifuge the product, wash it, put it into an oven, and dry it at 60°C to obtain a precursor;

[0035] (5) Heat treatment process: the precursor was sintered in a tube furnace at 500°C for 2h under the protection of argon to obtain Ce-SnS 2 / graphene material.

[0036] The product in Example 2 was assembled into a CR2016 button battery (the method is the same as in Example 1). Under the condition of current density 0.1C, the charge and discharge performance test is carried out, the charge and discharge voltage range is 0-2.0V, a...

Embodiment 3

[0038] (1) SnCl with a molar ratio of 2:0.1:6:0.1 4 ·5H 2 O: Ce(NO 3 ) 3 ·6H 2 O: CH 3 CSNH 2 : CTAB is dissolved in a mixed solution of water and ethanol;

[0039] (2) In the mixed solution, add an aqueous solution containing 0.24 g of graphene oxide, and continue to stir until it is completely dissolved;

[0040] (3) Transfer the mixture to a polytetrafluoroethylene-lined hydrothermal reactor and react at 180°C for 36 hours;

[0041] (4) Centrifuge the product, wash it, put it into an oven, and dry it at 60°C to obtain a precursor;

[0042] (5) Heat treatment process: the precursor was sintered in a tube furnace at 500°C for 2h under the protection of argon to obtain Ce-SnS 2 / graphene material.

[0043] The product in Example 3 was assembled into a CR2016 button battery (the method is the same as in Example 1). Under the condition of current density 0.1C, the charge and discharge performance test is carried out, the charge and discharge voltage range is 0-2.0V, and ...

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Abstract

The invention relates to preparation of a rare earth metal-tin sulfide / grapheme negative electrode material for lithium ion batteries. A simple hydrothermal method is used to obtain a Ce-SnS2 / grapheme material. The synthesized Ce-SnS2 / grapheme material is mixed with Ce and grapheme, the volume changes caused during charge and discharge can be relieved effectively, the electrode capacity of the material can be prevented from fading too fast, and at the same time, the electrical conductivity is increased, so that the capacity of the Ce-SnS2 / grapheme material is higher than the cycle performance of pure-phase SnS2. According to the synthesized material, the graphite has good electrical conductivity, carriers can be transferred during re-charge and re-discharge conveniently, the volume changes caused during charge and discharge can be relieved effectively, the electrode capacity of the material is prevented from fading too fast, and disadvantages of a single SnS2 electrode is overcome. The material serves the negative electrode material for lithium ion batteries and is provided with considerable capacity and good cycle performances, and the disadvantages of the single SnS2 electrode are overcome.

Description

technical field [0001] The invention relates to the preparation of a negative electrode material in the technical field of lithium-ion batteries, specifically the preparation of a rare earth metal and graphene-doped tin sulfide negative electrode material, that is, cerium (Ce) and graphene (graphene) doped tin sulfide ( SnS 2 ) (hereinafter referred to as Ce-SnS 2 / graphene) lithium-ion battery anode material. Background technique [0002] Tin-based materials are ideal anode materials for lithium-ion batteries due to their high theoretical capacity, low cost, low toxicity, and broad practicability. The document "Journal of Power Sources", 98-97 (2006) pp.198-200" discloses a tin sulfide material synthesized by a sonochemical method. The method is to put SnC1 4 ·5H 2 O and thioacetamide were dissolved in water, and the aqueous solution was sonicated in air to obtain amorphous SnS 2 , and then calcined at 400 °C to obtain crystalline SnS 2 . After electrochemical perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/1397C01G19/00
CPCY02E60/122Y02E60/10
Inventor 黄英王秋芬赵阳王科王岩丁娟宗蒙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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