Sic core/shell nanomaterials for high performance anode of lithium ion batteries

An anode material and carbon shell technology, applied in the field of nanomaterials, can solve the problems of unmet demand for anode materials, difficulties, and expensive silicon nanowires.

Active Publication Date: 2015-06-10
NANO & ADVANCED MATERIALS INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, all methods require high-temperature reactions (~1000°C) and prolonged vacuum conditions, making the resulting silicon nanowires very expensive ($1150-5000 / gram)
In addition, the complex synthesis process makes it very difficult to scale up, and it is impossible to obtain 100 grams of product
[0010] Therefore, there is an unmet need for anode materials that provide high conductivity, advanced cycle performance, low cost, and easy to scale-up production of Li-ion batteries

Method used

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  • Sic core/shell nanomaterials for high performance anode of lithium ion batteries
  • Sic core/shell nanomaterials for high performance anode of lithium ion batteries
  • Sic core/shell nanomaterials for high performance anode of lithium ion batteries

Examples

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Effect test

example 1

[0057] Example 1: Silicon nanocluster carbon core / shell anode material with good stability and battery cycle performance.

[0058] 12 g of silicon was mixed with 120 ml of water with stirring, and then 120 g of glucose and 4 ml of ethanol were added to form a mixed suspension. The mixture was heated hydrothermally at 200°C for 12 hours. The resulting material was isolated by filtration. The precipitate was dried in a vacuum oven and then carbonized.

[0059] Measuring the charge and discharge capacity of a coin cell with lithium metal foil used as the counter electrode. The electrolyte employed was 1M LiPF in ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate (EC+EMC+DMC) (volume 1:1:1) 6 solution. In a conditional mixer (AR-100, Thinky) active material powder (52.5%), Super P (17.5%) and sodium alginate binder (30%) were uniformly mixed in water (sodium alginate: NMP = 1: 15). The paste is evenly coated on copper and aluminum foil. Finally, the electrode...

example 2

[0063] Example 2: Silicon nanocluster carbon core / shell anode material with thinner carbon shell and less space by tuning synthesis parameters (lower ethanol content and lower glucose content).

[0064] 12 g of silicon was mixed with 120 ml of water with stirring, and then 40 g of glucose and 3 ml of ethanol were added to form a mixed suspension. The mixture was heated hydrothermally at 200°C for 12 hours. The resulting material was isolated by filtration. The precipitate was dried in a vacuum oven and then carbonized.

[0065]Measuring the charge and discharge capacity of a coin cell with lithium metal foil used as the counter electrode. The electrolyte used was a 1M LiPF6 solution in ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate (EC+EMC+DMC) (1:1:1 by volume). In a conditional mixer (AR-100, Thinky) active material powder (52.5%), Super P (17.5%) and sodium alginate binder (30%) were uniformly mixed in water (sodium alginate: NMP = 1: 15). The paste ...

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Abstract

The present invention is to tackle the volume expansion problem of the Si anode materials in the application of lithium ion batteries. In the present invention, a simple and green hydrothermal method is use to form loosely packed Si@C core / shell structure. A carbon coating layer is formed on controllably aggregated silicon nanoparticles in a one-step procedure by the hydrothermal carbonization of a carbon-rich precursor.

Description

[0001] Cross reference to related applications [0002] This application claims the benefit of US Provisional Patent Application Serial No. 61 / 963,611 filed December 9, 2013, the disclosure of which is hereby incorporated by reference into this application. technical field [0003] The invention relates to a nanometer material used for lithium battery anodes. More specifically, the present invention relates to a SiC core / shell nanomaterial for lithium battery anodes, and a corresponding method of manufacturing the nanomaterial. Background technique [0004] Existing achievements in battery technology can't seem to keep up with the growing demands we place on our ever-increasing mobile devices. What's more, a future in which millions of fossil fuel-powered vehicles are replaced by plug-in electric vehicles presents enormous economic and environmental benefits. This is why research targeting next-generation battery technologies is the focus of global attention. [0005] Tod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583
CPCH01M4/366H01M4/386H01M4/583H01M4/587H01M4/625Y02E60/10H01M4/0471H01M4/134H01M4/1395H01M10/0525H01M2004/021H01M2004/027
Inventor 刘晨敏蔡力锋蔡丞恩黄嘉勤
Owner NANO & ADVANCED MATERIALS INST
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