Stannous oxide/graphene heterojunction composite material, preparation method and application thereof, and metal lithium negative electrode taking stannous oxide/graphene heterojunction composite material as host

A technology of graphene composite and stannous oxide, which is applied in the field of metal lithium anode, can solve the problems of poor cycle performance, fast capacity decay and lithium dendrite growth of metal lithium anode, and achieve the improvement of easy growth of lithium dendrites, uniform deposition and The effect of stripping and speeding up the transfer

Active Publication Date: 2020-12-22
四川普利司德高分子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to aim at the deficiencies in the prior art, provide a kind of stannous oxide / graphene heterojunction composite material and its preparation method and application, obtain a kind of stannous oxide / graphite with good lithium affinity and conductivity Graphene heterojunction material, as the supporting host of lithium metal negative electrode; the present invention also provides a metal lithium negative electrode with stannous oxide / graphene heterojunction composite material as the host; thereby solving the problem of poor cycle performance and capacity fading of metal lithium negative electrode Fast, lithium dendrite growth and other issues

Method used

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  • Stannous oxide/graphene heterojunction composite material, preparation method and application thereof, and metal lithium negative electrode taking stannous oxide/graphene heterojunction composite material as host
  • Stannous oxide/graphene heterojunction composite material, preparation method and application thereof, and metal lithium negative electrode taking stannous oxide/graphene heterojunction composite material as host
  • Stannous oxide/graphene heterojunction composite material, preparation method and application thereof, and metal lithium negative electrode taking stannous oxide/graphene heterojunction composite material as host

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) 0.65g SnCl 2 2H 2 O was dissolved in 20mL deionized water, 0.34g NaOH was weighed and dissolved in 10mL deionized water, NaOH solution was added dropwise under stirring condition, and white Sn 6 o 4 (OH) 4 Suspension, then ultrasonicated at 40kHz 100W for 2h to obtain a brown precipitate, centrifuged at 8000rpm to separate the precipitate, and washed with deionized water and absolute ethanol, the precipitate was dried in a vacuum oven at 90°C for 12h to obtain SnO Micron square (SnO-MS);

[0040] (2) 0.65g SnCl 2 2H 2 O and 1g of PVP were dissolved in 20mL deionized water, 0.34g NaOH was weighed and dissolved in 10mL deionized water, NaOH solution was added dropwise under stirring condition, and white Sn was generated after 0.5h reaction. 6 o 4 (OH) 4 Suspension, and then ultrasonicated at 40kHz 100W for 2h to obtain a brown precipitate, centrifuged at 8000rpm to separate the precipitate, washed with deionized water and absolute ethanol, and dried in a vacuu...

Embodiment 2

[0054] (1) 0.65g SnCl 2 2H 2 O was dissolved in 20mL deionized water, 0.44g NaOH was weighed and dissolved in 10mL deionized water, NaOH solution was added dropwise under stirring condition, and white Sn 6 o 4 (OH) 4 Suspension, and then ultrasonicated at 40kHz 100W for 2h to obtain a brown precipitate, centrifuged at 8000rpm to separate the precipitate, and washed with deionized water and absolute ethanol, the precipitate was dried in a vacuum oven at 90°C for 12h to obtain SnO -MS;

[0055] (2) 0.65g SnCl 2 2H 2 O and 5g PVP were dissolved in 20mL deionized water, 0.44g NaOH was weighed and dissolved in 10mL deionized water, NaOH solution was added dropwise under stirring conditions, and white Sn was generated after 0.5h reaction. 6 o 4 (OH) 4 Suspension, and then ultrasonicated at 40kHz 100W for 2h to obtain a brown precipitate, centrifuged at 8000rpm to separate the precipitate, and washed with deionized water and absolute ethanol, the precipitate was dried in a va...

Embodiment 3

[0061](1) 0.65g SnCl 2 2H 2 O was dissolved in 20mL deionized water, 0.4g NaOH was weighed and dissolved in 10mL deionized water, NaOH solution was added dropwise under stirring condition, and white Sn 6 o 4 (OH) 4 Suspension, and then ultrasonicated at 40kHz 100W for 2h to obtain a brown precipitate, centrifuged at 8000rpm to separate the precipitate, and washed with deionized water and absolute ethanol, the precipitate was dried in a vacuum oven at 90°C for 12h to obtain SnO -MS;

[0062] (2) 0.65g SnCl 2 2H 2 O and 3g PVP were dissolved in 20mL deionized water, 0.4g NaOH was weighed and dissolved in 10mL deionized water, NaOH solution was added dropwise under stirring condition, and white Sn was generated after 0.5h reaction. 6 o 4 (OH) 4 Suspension, and then ultrasonicated at 40kHz 100W for 2h to obtain a brown precipitate, centrifuged at 8000rpm to separate the precipitate, and washed with deionized water and absolute ethanol, the precipitate was dried in a vacuum...

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Abstract

The invention discloses a stannous oxide/graphene heterojunction composite material, a preparation method and application thereof and a metal lithium negative electrode taking the stannous oxide/graphene heterojunction composite material as a host. The preparation method comprises the following steps: preparing stannous oxide nanosheets through a polymer-assisted liquid-phase synthesis method; carrying out positive electricity modification on the graphene nanosheet, and inducing stannous oxide and graphene to be alternately stacked and assembled in a liquid phase environment to prepare a stannous oxide/graphene heterojunction material; uniformly coating a copper foil current collector with the heterojunction material, and controlling the lithium metal deposition reaction on the electrode to prepare the lithium metal heterojunction composite electrode. The stannous oxide/graphene heterojunction composite material obtained in the invention has good conductivity and good lithium affinity,reversible deposition and stripping of lithium metal can be realized by taking the stannous oxide/graphene heterojunction composite material as a support host material of a metal lithium negative electrode, volume expansion of metal lithium and growth of lithium dendrites are inhibited in a cyclic process, and the high-performance lithium metal negative electrode of the lithium ion battery is obtained.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a stannous oxide / graphene heterojunction composite material and a metal lithium negative electrode using the material as a host material. Background technique [0002] As the negative electrode of lithium secondary batteries, metal lithium anode is considered to be the next generation of high specific energy lithium ion battery due to its very high specific capacity (3860mAh / g) and very low electrode potential (-3.04V vs standard hydrogen electrode) The ultimate choice of , which has attracted widespread attention from industry to academia (Nature Communications, 2020, 11(1), 1584). However, in practical applications, the growth of lithium dendrites will cause excessive side reactions with the electrolyte, resulting in excessive consumption of active lithium and electrolyte, leading to unstable capacity fading cycles. In addition, lithium dendrites are easy to pierce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525C01B32/182
CPCH01M4/362H01M4/387H01M4/583H01M10/0525C01B32/182Y02E60/10
Inventor 刘慰江品娴陈云贵
Owner 四川普利司德高分子新材料有限公司
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