Method for Pretreating Nano Hollow Silicon/Carbon Electrode Materials of Electrochemical Energy Storage Devices with Solvents and Solvent-in-Silicon Particles

An energy storage device, hollow silicon technology, applied in nanotechnology for materials and surface science, battery electrodes, electrochemical generators, etc. It can improve the charge and discharge capacity, solve the battery capacity decay, and improve the cycle life.

Active Publication Date: 2021-11-02
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] like figure 1 As shown, if the nano-sized hollow silicon material is mixed according to the same method, it will be suspended in the upper layer of the solution due to the low density of silicon in the nano-hollow structure, and there will be no uniform contact between silicon and carbon, and stratification will occur; In addition, most of the binder will preferentially adsorb on the hollow silicon surface and occupy the hollow structure
In addition, the delamination of hollow silicon, conductive agent, and graphite leads to poor conductivity between the coated electrode active materials after mixing, which is manifested as rapid battery capacity decay; During the charge and discharge process, it will hinder the penetration of the electrolyte, resulting in a decrease in the utilization of active materials, which is manifested as a decrease in battery capacity

Method used

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  • Method for Pretreating Nano Hollow Silicon/Carbon Electrode Materials of Electrochemical Energy Storage Devices with Solvents and Solvent-in-Silicon Particles
  • Method for Pretreating Nano Hollow Silicon/Carbon Electrode Materials of Electrochemical Energy Storage Devices with Solvents and Solvent-in-Silicon Particles
  • Method for Pretreating Nano Hollow Silicon/Carbon Electrode Materials of Electrochemical Energy Storage Devices with Solvents and Solvent-in-Silicon Particles

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Example 1: Preparation of nanoscale water-in-silicon particles

[0069] Using the method in CN105705460A, 20 g of nanoscale hollow silicon for electrodes was prepared.

[0070] Weigh 4g of nanoscale hollow silicon and place it in a vertical centrifugal disperser, and then add 40ml of deionized water. A two-stage stirring process is set up. The first stage: the stirring speed is 300r / min, which lasts for 5 minutes; the second stage: the stirring speed is 2000r / min, which lasts for 35 minutes. Thus, the nano hollow silicon and water are thoroughly mixed to obtain a solution of water-in-silicon particles.

[0071] Take half of the volume of the water-in-silicon particle solution for suction filtration, and air-dry the solid obtained by suction filtration in a fume hood at room temperature for 2 hours to obtain nanoscale water-in-silicon particles.

[0072] figure 2 A schematic diagram of the nanoscale water-in-silicon particles of the present disclosure is given.

Embodiment 2

[0073] Embodiment 2: Preparation of electrodes for electrochemical energy storage devices

[0074] 1) Add 0.8 g of water-based binder to the other half of the water-in-silicon particle solution that has not been suction-filtered prepared in Example 1 above, set the stirring speed to 2000 r / min, and continue stirring for 0.5 h. Then, add 0.4g of conductive agent and 16.8g of graphite in sequence, and set up a three-stage stirring process, the first stage: stirring speed 300r / min, last 10min; second stage: stirring speed 600r / min, last 10min ; The third section: stirring speed 3000r / min, duration 3h. After thorough mixing, an electrode slurry is prepared.

[0075] 2) The electrode slurry is coated on the current collector, and then dried at 100° C. for 12 hours to obtain an electrode for an electrochemical energy storage device, and the thickness of the electrode after drying is 75 μm.

[0076] image 3 A schematic diagram of an electrode of a carbon / silicon composite accordi...

Embodiment 3

[0079] Except replacing the water in embodiment 1 and 2 with ethanol, prepare nanoscale silicon-coated ethanol particles with the same method as described in embodiment 1 and 2, and then prepare with graphite, conductive agent, organic binder electrodes for electrochemical energy storage devices.

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Abstract

The present disclosure relates to a method for pretreating a nano-hollow silicon / carbon electrode material of an electrochemical energy storage device with a solvent and solvent-in-silicon particles. Nano-scale silicon-in-solvent particles pretreated by the method of the present disclosure, a method for preparing an electrode using the nano-scale silicon-in-solvent particles, an electrode prepared by the electrode preparation method, and an electrochemical device comprising the electrode. energy storage device. The method according to the present disclosure solves the delamination phenomenon caused by the low density of hollow silicon in the conventional mixing process. Therefore, in further charge and discharge tests, the conductivity of the pole piece is significantly improved, and the performance of the battery is significantly improved. In the disclosed method, the solvent is used as the filler of the hollow structure, and no additional impurities and by-products will be introduced. When water is used as the filling agent, the source of water is extensive, the cost is low, and the operation process is simple. Therefore, the pretreatment process is very suitable for industrial production.

Description

technical field [0001] The present disclosure relates to a method for pre-treating nano-hollow silicon / carbon electrode materials of electrochemical energy storage devices with a solvent. More specifically, the present disclosure relates to a method for pretreating a nanoscale hollow silicon / carbon electrode material of an electrochemical energy storage device with a solvent. A method for preparing an electrode of grade silicon-in-solvent particles, an electrode prepared by the method for preparing the electrode, and an electrochemical energy storage device comprising the electrode. Background technique [0002] With the development of portable devices, electric vehicles, etc., the energy demand in these fields is also increasing. Electrochemical energy storage devices such as electrochemical energy storage devices and supercapacitors have attracted widespread attention due to their excellent performance in terms of energy density, power density, cycleability, and safety. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/133H01M4/134H01M4/1393H01M4/1395H01M10/0525H01G11/30H01G11/32H01G11/84B82Y30/00
CPCB82Y30/00H01G11/30H01G11/32H01G11/84H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 邱新平张文广
Owner TSINGHUA UNIV
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