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Nano heterostructure material for anode material of lithium battery, and preparation

A nano-heterostructure, lithium battery anode technology, applied in nanotechnology for materials and surface science, battery electrodes, lithium batteries, etc. Improve the specific capacity and cycle stability, improve the performance of lithium batteries, good conductivity

Inactive Publication Date: 2014-10-15
NANJING UNIV
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Problems solved by technology

[0003] However, due to the continuous intercalation and extraction of lithium ions during the lithiation cycle, SnO 2 The volume of the material expands by 300%, and the volume expansion of Si exceeds 400%, causing the material to be crushed or even broken, destroying the electrode structure, making its electrical contact worse, and the capacity reduced

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  • Nano heterostructure material for anode material of lithium battery, and preparation

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[0023] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following in conjunction with specific examples, and with reference to the appended figure 1 , to further describe the present invention in detail.

[0024] Figure shows epitaxial dendritic Si(Ge) / SnO 2 (In 2 o 3 ) Basic processes of nanoheterostructures. Due to SnO 2 (In 2 o 3 ) has good electrical conductivity, and the volume expansion is small during the lithiation process, so in the lithiation process, the SnO grown on the current collector is used 2 (In 2 o 3) nanowires as the backbone, which can maintain a good electrical contact between it and the current collector, a complete structure, and a good one-dimensional electron transport channel. Using Si(Ge) nanowires with large specific capacity as branches can increase the surface area of ​​Si(Ge) nanowires exposed to the electrolyte, thereby providing more active sites for the reaction with lithium ions....

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Abstract

The invention discloses a nano heterostructure material for an anode material of a lithium battery. A one-dimensional metal oxide (SnO2 or In2O3 or SnOx, InxOy, Sn doped InxOy, In doped SnOx, TiOx and VxOy) nano structure with good conductivity serves as a trunk material; a one-dimensional Si or Ge nano structure with poor conductivity serves as a branch material; and the branch material is grafted onto the trunk material. In a grafting process, a SnO2 (In2O3) nano trunk is subjected to hydrogen treatment, and then Sn (In) nano particles are formed on the surface of the nano trunk, and direct epitaxy of Si (Ge) nano branches can be achieved by taking the Sn (In) nano particles as a catalyst through a VLS (Vapor-Liquid-Solid) growth process. For a branch part in a heterostructure, the one-dimensional Si (Ge) nano structure growing with the Sn nano particles on the head is also a good lithium storage system.

Description

1. Technical field [0001] The invention relates to a nano-heterogeneous structure and a preparation method for lithium battery anode materials, especially on SnO 2 (In 2 o 3 ) heterostructure formed by epitaxial Si(Ge) branch nanowires directly after hydrogen treatment on the backbone nanowires. 2. Technical background [0002] As the application range of lithium batteries gradually expands to high-power and high-current electric equipment such as electric vehicles, the traditional theoretical reversible specific capacity of 372mAh / g graphite material has been difficult to meet people's requirements for lithium storage capacity and power. Electrode materials with high energy density, high energy density and high cycle stability have become an inevitable trend in the development of next-generation lithium batteries. Among many materials, SnO 2 Because of its good conductivity and high specific capacity (theoretical reversible specific capacity reaches 781mAh / g); Si(Ge) ma...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62B82Y30/00B82Y40/00
CPCH01M4/362H01M4/38H01M4/386H01M4/483H01M4/62H01M10/052B82Y30/00B82Y40/00Y02E60/10
Inventor 余林蔚宋虎成徐骏
Owner NANJING UNIV
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