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Flexible nanometer sno2/si composite lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of poor cycle performance of electrode materials, material powderization, etc., to improve charge and discharge capacity and cycle life, high specific surface area. , the effect of improving cycle performance

Inactive Publication Date: 2016-01-20
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the lithium intercalation / delithiation process, the huge change in the volume of the material leads to serious powdering of the material, causing Si and SnO 2 Poor cycle performance of electrode materials

Method used

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  • Flexible nanometer sno2/si composite lithium ion battery negative electrode material and preparation method thereof
  • Flexible nanometer sno2/si composite lithium ion battery negative electrode material and preparation method thereof
  • Flexible nanometer sno2/si composite lithium ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0018] A kind of flexible nano SnO 2 / Si composite lithium ion battery negative electrode material preparation method,

[0019] 1. First choose a piece of 1.5*3cm 2 Large and small conductive carbon cloth materials are used as flexible substrates, which are characterized by the use of carbon cloth substrates, which are woven from high-conductivity carbon fibers, and the electrical conductivity is 2 .

[0020] 2. Deposit 2-3nm Au as a catalyst on the carbon cloth substrate by ion sputtering method, and the deposition time is 150s.

[0021] 3. Growth of SnO on carbon cloth substrate 2 Nanowires, the specific process: put 0.1g of 99.99% Sn powder and carbon cloth substrate sputtered with Au into a quartz boat, then load the quartz boat into the quartz tube of a chemical vapor deposition device with a diameter of 40cm, and vacuumize it. The furnace is controlled by the program to heat up to 800 ° C, and the temperature is kept for 40 minutes, and 99.5% Ar and 0.5% O are passed ...

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Abstract

The invention discloses a flexible nano SnO2 / Si composite lithium ion battery negative-electrode material and a preparation method thereof. The negative-electrode material belongs to the field of preparation of electrochemical power supplies, can mainly improve charge and discharge capacity and cyclic stability of negative-electrode materials, and is suitable for portable batteries and the negative-electrode materials of dynamical power supplies. First, a electric-conduction carbon cloth material is chosen as a flexible substrate, Au having a depth of 2-3nm is sputtered on the carbon cloth substrate by use of an ion sputtering instrument; then SnO2 nanowires are grown in a manner of vapor phase growth on the carbon cloth substrate where the Au is sputtered on; and finally a layer of Si having a depth of 10-20nm is deposited on the the surfaces of the SnO2 nanowires by use of plasma enhanced vapor deposition, and the flexible nano SnO2 / Si composited lithium ion battery negative-electrode material is obtained. The flexible carbon cloth substrate is employed in the method, so the negative-electrode material can be bended and folded, needs no binders, has good performances of mechanics of machinery, can improve the charge and discharge capacity of the batteries (with the charge and discharge capacity greater than 1000 mAh g<-1>), and has good cycling stability.

Description

technical field [0001] The invention belongs to the field of preparation of electrochemical power sources, in particular to a flexible nano SnO 2 The invention relates to a preparation method of a negative electrode material of a / Si composite lithium ion battery, which mainly improves the charge and discharge capacity and cycle stability of the negative electrode material, and is suitable for portable batteries and power supply negative electrode materials. Background technique [0002] With the development of power batteries, lithium-ion power batteries have the advantages of fast charging and discharging speed, long cycle life, good load performance and high working voltage, and have gradually become mainstream products, and have been widely used in various portable electronic device power supplies and power supplies. As an important factor to improve battery energy and cycle life, anode materials for lithium-ion batteries have been extensively studied. Lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/139H01M4/38H01M4/48B82Y30/00
CPCY02E60/10
Inventor 程传伟任伟娜
Owner TONGJI UNIV
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