Sn-based sulfide and/or nitride modified tin oxide thin-film lithium battery negative electrode and preparation and application thereof

A sulfide, lithium battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of decreased electrode volume energy density, difficult control of structure and thickness of active material quality, and inability to play, to provide storage capacity. Lithium capacity, the effect of improving capacity and cycle performance, and improving energy density

Active Publication Date: 2019-07-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent deposits Sn on the nickel foam and makes it into an alloy. The method is simple, but the structure and thickness, including the amount of active materials, are difficult to control during the electrochemical deposition process, and the porous structure of the foam nickel will lead to the volumetric energy density of the electrode. decline, unable to exert its due effect

Method used

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  • Sn-based sulfide and/or nitride modified tin oxide thin-film lithium battery negative electrode and preparation and application thereof
  • Sn-based sulfide and/or nitride modified tin oxide thin-film lithium battery negative electrode and preparation and application thereof
  • Sn-based sulfide and/or nitride modified tin oxide thin-film lithium battery negative electrode and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Soak the copper foil in 15wt% sulfuric acid for 12h, dry it with alcohol after cleaning and cut it into small pieces of 2cm×2cm. Fix the copper foil on the target stage, select Cr as the target material, and use Ar gas as the atmosphere, remove the baffle after pre-sputtering for 10mins, adjust the power to 80W, and sputter for 5mins. At this time, the thickness of the sputtered Cr layer is 40 nm.

[0095] After the first sputtering, replace the target with Sn target, and adjust the atmosphere to Ar / O 2 (1:6), remove the baffle after pre-sputtering for 10mins, adjust the power to 60W, and sputter for 20mins to obtain 2 thin film copper foil. At this point sputtering SnO 2 The layer thickness is 200 nm. Continue to place the thin film electrode in the magnetron sputtering chamber, change the sputtering atmosphere to Ar / N 2 (1:1), remove the baffle after pre-sputtering for 10mins, adjust the power to 20W, and sputter for 15mins. Sputtering SnN at this time 0.8 The ...

Embodiment 2

[0100] Soak the copper foil in 10wt% sulfuric acid for 12h, dry it with alcohol after cleaning and cut it into small pieces of 2cm×2cm. Fix the copper foil on the target platform, use Ti as the target material, and Ar gas as the atmosphere, remove the baffle after pre-sputtering for 10mins, adjust the power to 50W, and sputter for 10mins. At this time, the sputtered Ti layer has a thickness of 18 nm.

[0101] After the first sputtering, replace the target with Sn target, and adjust the atmosphere to Ar / O 2 (1:2), remove the baffle after pre-sputtering for 10mins, adjust the power to 80W, and sputter for 10mins to obtain 2 thin film copper foil. At this point sputtering SnO 2 The layer thickness was 270 nm. Continue to place the thin film electrode in the magnetron sputtering chamber, change the sputtering atmosphere to Ar / N 2 (1:10), remove the baffle after pre-sputtering for 10mins, adjust the power to 30W, and sputter for 15mins. At this time, the thickness of the sput...

Embodiment 3

[0104] Soak the copper foil in 10wt% hydrochloric acid for 12 hours, dry it with alcohol after cleaning and cut it into small pieces of 2cm×2cm. Fix the copper foil on the target stage, select Pt as the target material, and use Ar gas as the atmosphere, remove the baffle after pre-sputtering for 10mins, adjust the power to 50W, and sputter for 7mins. At this time, the thickness of the sputtered Pt layer was 15 nm.

[0105] After the first sputtering, replace the target with Sn target, and adjust the atmosphere to Ar / O 2 (1:1), remove the baffle after pre-sputtering for 10mins, adjust the power to 40W, and sputter for 30mins to obtain 2 thin film copper foil. At this point sputtering SnO 2 The layer thickness was 350 nm. Continue to place the thin film electrode in the magnetron sputtering chamber, change the sputtering atmosphere to Ar / H 2 S (1:4), remove the baffle after pre-sputtering for 10mins, adjust the power to 40W, and sputter for 12mins. At this point the sputte...

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Abstract

The invention discloses a Sn-based sulfide and/or nitride modified SnO2 thin-film lithium battery negative electrode, and the negative electrode is characterized in that the negative electrode comprises a current collector, a metal buffer layer compounded on the current collector, an active substance layer compounded on the metal buffer layer and a modification layer compounded on the active substance layer; the material of the metal buffer layer is a conductive metal with the lattice constant being within the range of 3.6-4.7; the material of the active substance layer is SnO2; the material of the modification layer is SnS2 and/or SnNx, wherein x is 0.7 to 1.2. The invention also provides a preparation method and application of the negative electrode. According to the present invention, with the existence of the metal buffer layer, the active material layer having the dominant crystal face structure and the modification layer can be stably compounded without the existence of the adhesive phase; for example, SnO2 can be tightly compounded; in addition, the volume effect of the active substance in the charging and discharging process is buffered to a certain extent.

Description

technical field [0001] The invention relates to a method for preparing a thin-film lithium-ion battery electrode, belonging to the field of lithium-ion batteries. Background technique [0002] Energy is an important material basis for developing the national economy and improving people's living standards, and it is also an important factor that directly affects economic development. Since the beginning of the 21st century, problems such as resource shortage, environmental pollution, and greenhouse effect caused by traditional energy utilization methods have become increasingly prominent. Improving the energy structure and developing efficient and clean new energy sources has become a global consensus. Lithium-ion batteries are favored by people because of their superior properties such as safety, environmental protection, high specific energy and good electrochemical performance. In order to meet the requirements of the energy miniaturization of traditional microelectronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/38H01M4/48H01M4/58
CPCH01M4/5815H01M4/387H01M4/58H01M4/48H01M4/13H01M4/139Y02E60/10
Inventor 赖延清张治安王麒羽汪齐刘芳洋洪波张凯李劼
Owner CENT SOUTH UNIV
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