Rapid evaluation method for electrochemical performance of silicon negative electrode material

An evaluation method, electrochemical technology, applied in nanotechnology for materials and surface science, analysis of materials, material analysis using wave/particle radiation, etc., can solve problems such as strong surface activity, small particles, and large specific surface area , to achieve the effects of short time-consuming, strong process practicability, and reduced floating phenomenon

Pending Publication Date: 2020-11-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with graphite powder, silicon powder is expected to be difficult to accurately evaluate the performance of silicon negative electrodes through the above-mentioned patented process due to its small particle size, large specific surface area, and strong surface activity.

Method used

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  • Rapid evaluation method for electrochemical performance of silicon negative electrode material
  • Rapid evaluation method for electrochemical performance of silicon negative electrode material
  • Rapid evaluation method for electrochemical performance of silicon negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The rapid evaluation method of the electrochemical performance of the silicon negative electrode material of the present embodiment, such as figure 1 shown, including the following steps:

[0031] 1. First, add nano-silica powder, acetylene black and carbon nanotube conductive paste to the dispersion of sodium carboxymethyl cellulose, and after preliminary mixing, transfer to the machine with the function of airflow shear force generated by speed difference In the dispersing equipment, the rotating speed is 30 m / s, and the time is 30 seconds, and rapid mixing is carried out to realize nano-scale dispersion, and slurry A is obtained;

[0032] 2. Then add the SBR dispersion liquid rich in carboxyl groups on the surface to slurry A, and mix at a speed of 560 rpm for about 30 minutes to obtain slurry B;

[0033] 3. Then apply the slurry B on the copper current collector, and dry it quickly through an infrared heater and a blast oven;

[0034] 4. After the pole piece is pu...

Embodiment 2

[0040] The rapid evaluation method of the electrochemical performance of the silicon negative electrode material of the present embodiment, such as figure 1 shown, including the following steps:

[0041] 1. First, add nano-silica powder and graphene conductive paste to the dispersion of carboxymethyl cellulose lithium. After preliminary mixing, transfer it to the beater equipment with ultrasonic dispersion function. The time is more than 1h. Mix to achieve nanoscale dispersion to obtain slurry A;

[0042] 2. Then add the PAA dispersion liquid rich in carboxyl groups on the surface to slurry A, and mix at a speed of 560 rpm for about 30 minutes to obtain slurry B;

[0043] 3. Then apply the slurry B on the copper current collector, and dry it quickly through an infrared heater and a blast oven;

[0044] 4. After the pole piece is punched into a pole piece with a certain diameter and processed, the CR series button battery is assembled for testing and evaluation.

[0045] Eac...

Embodiment 3

[0050] The rapid evaluation method of the electrochemical performance of the silicon negative electrode material of the present embodiment, such as figure 1 shown, including the following steps:

[0051]1. First, add silicon powder, silicon oxide, and carbon black conductive paste to the dispersion of carboxymethyl cellulose. After preliminary mixing, transfer to the ball milling equipment with ultra-small particle size ball milling beads. Time For more than 3h, mixing is carried out to realize nanoscale dispersion, and slurry A is obtained;

[0052] 2. Then add the sodium alginate binder into the slurry A, and mix at a speed of 560rpm for about 30 minutes to obtain the slurry B;

[0053] 3. Then apply the slurry B on the copper current collector, and dry it quickly through a blast oven;

[0054] 4. After the pole piece is punched into a pole piece with a certain diameter and processed, the CR series button battery is assembled for testing and evaluation.

[0055] Each raw ...

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Abstract

The invention discloses a method for quickly evaluating the electrochemical performance of a silicon negative electrode material, which comprises the following steps: adding silicon powder and a conductive agent into a binder A, and carrying out nanoscale dispersion to obtain slurry A; adding a surface functionalized binder B into the slurry A, and uniformly mixing to obtain slurry B; coating theslurry B on the surface of a copper current collector, performing drying, and performing punching to obtain a pole piece; and assembling the pole pieces into a CR series button cell, and carrying outevaluation test. Compared with the prior art, the method provided by the invention has the beneficial effects that the electrochemical performance of the silicon negative electrode material is accurately and quickly analyzed and evaluated mainly through the design of a nano-dispersion process of silicon particles, the matching of a surface functionalized binder, the quick drying of a pole piece and other process designs.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a rapid evaluation method for the electrochemical performance of a silicon negative electrode material. Background technique [0002] At present, the power battery market has put forward higher requirements for high-capacity anode materials. As we all know, due to the limitation of the theoretical capacity of graphite anode materials, a large number of researchers have focused on the development and design of silicon anode materials. The current mainstream research idea is to add silicon anode materials such as nano-silicon or silicon oxide to the traditional graphite anode, so as to design a reasonable silicon-carbon material structure and ensure a very good dispersion of silicon materials in graphite materials. or recombination. From this point of view, using low-cost industrial-grade silicon raw materials to develop nano-micronized silicon materials is the primar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/382G01N23/2251G01N1/28B82Y30/00
CPCG01R31/382G01N23/2251G01N1/286B82Y30/00G01N2001/2866
Inventor 吴若飞李铮铮杨兵徐丽敏朱健桦王婧洁
Owner BAOSHAN IRON & STEEL CO LTD
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