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Silicon oxide-lithium composite material and preparation method and application thereof

A silicon oxide and lithium sheet technology, applied in nanotechnology, electrochemical generators, active material electrodes, etc. for materials and surface science, can solve problems such as high cost, difficult structure control, complex synthesis process, etc., to achieve guaranteed The effects of stability, increased diffusion rate, and simple manufacturing process

Active Publication Date: 2021-01-01
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the current research on the basis of silicon-based SEI, it is found that there are many problems such as complex synthesis process, difficult structure control, and high cost.

Method used

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  • Silicon oxide-lithium composite material and preparation method and application thereof
  • Silicon oxide-lithium composite material and preparation method and application thereof
  • Silicon oxide-lithium composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The "Bringing the Old and the Same Cave" fossil (purchased from the sea shell handicraft wholesale market in the world, the real thing is as follows: figure 1Shown) remove the head and tail, cut into a single-layer sheet structure, the obtained silicon oxide (SiO 2 ) frame sample was washed in distilled water, and the quantitative alcohol was cleaned in an ultrasonic cleaning machine for 20-30 minutes and repeated 3 times, and then dried in a 70°C oven for 24 hours to obtain a silicon oxide frame sample, and its SEM cross-sectional view was as follows: Figure 2-1 and 2-2 shown.

[0040] Cut the silicon oxide frame samples into 2cm*2cm samples respectively, and put them in the glove box (H 2 O2 2 -Li composite pole pieces are punched into a circle in a drying room with a tablet press with a head diameter of 1.2 cm, and silicon oxide-lithium (SiO2) for lithium metal batteries can be obtained. 2 -Li) composite negative electrode, its XDR map and SEM plan view are shown...

Embodiment 2

[0050] The "Bringing the Old and the Same Cave" fossil (purchased from the sea shell handicraft wholesale market in the world, the real thing is as follows: figure 1 Shown) remove the head and tail, cut into a single-layer sheet structure, the obtained silicon oxide (SiO 2 ) frame samples were washed in distilled water, washed with quantitative alcohol in an ultrasonic cleaner for 20-30 minutes and repeated 3 times, and then dried in an oven at 60°C for 24 hours to obtain a silicon oxide frame sample.

[0051] Cut the silicon oxide frame samples into samples with a size of 1.2cm*1.2cm, and put them in the glove box (H 2 O2 2 -Li composite pole pieces are cut into 1.2cm*1.2cm square samples with a blade to obtain silicon oxide-lithium (SiO 2 -Li) composite negative electrode. The resulting silicon oxide-lithium (SiO 2 -Li) composite anodes assembled into lithium metal batteries, including Li / Li half-cells and Li / LiFePO 4 The full battery was tested for cycle stability and c...

Embodiment 3

[0058] The "Bringing the Old and the Same Cave" fossil (purchased from the sea shell handicraft wholesale market in the world, the real thing is as follows: figure 1 Shown) remove the head and tail, cut into a single-layer sheet structure, the obtained silicon oxide (SiO 2 ) frame samples were washed in distilled water, washed with quantitative alcohol in an ultrasonic cleaner for 20-30 minutes and repeated 3 times, and then dried in an oven at 80°C for 24 hours to obtain a silicon oxide frame sample.

[0059] Cut the silicon oxide frame samples into 1cm*1.5cm samples respectively, and put them in the glove box (H 2 O2 2 -Li composite pole pieces are cut into 1cm*1.5cm rectangular samples with a blade to obtain silicon oxide-lithium (SiO 2 -Li) composite negative electrode. The resulting silicon oxide-lithium (SiO 2 -Li) composite anodes assembled into lithium metal batteries, including Li / Li half-cells and Li / LiFePO 4 The full battery was tested for cycle stability and ca...

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Abstract

The invention discloses a lithium silicon oxide composite material and a preparation method and application thereof. The lithium silicon oxide composite negative electrode is obtained by shearing fossils in the same hole into a silicon oxide frame sample with a single-layer sheet structure and then physically compounding the silicon oxide frame sample with one surface of a lithium sheet, and the lithium sheet is completely covered by the silicon oxide frame sample. The invention provides the application of the lithium silicon oxide composite negative electrode in the lithium metal battery, therate capability and the cycling stability of the lithium battery can be remarkably improved, and the service life of the lithium battery is remarkably prolonged.

Description

[0001] (1) Technical field [0002] The invention belongs to the field of lithium batteries and provides a silicon oxide-lithium (SiO 2 -Li) composite negative electrode and preparation method thereof. [0003] (2) Background technology [0004] In order to prolong the use time of portable electronic products and the mileage of the electric vehicle industry, finding high-energy-density batteries that can replace lithium-ion batteries has become the goal of current energy research. Lithium metal is in the main group I of the second cycle of the chemical element periodic table, and has very active chemical properties. It has entered people's field of vision due to its high theoretical specific capacity (3860mAh / g) and low potential (-3.04Vvs) standard hydrogen electrode) . These properties ensure that lithium metal can provide higher energy density than all other anode materials in full cells. Therefore, the use of lithium metal anodes for rechargeable batteries is one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/62H01M4/38H01M4/1395H01M10/0525B82Y30/00
CPCH01M4/134H01M4/1395H01M4/382H01M4/628H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 陶新永郑家乐赵新月姜驰张奔张宝霖徐祥蓁刘育京
Owner ZHEJIANG UNIV OF TECH
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