Preparation method of vulcanized conducting polymer composite anode for lithium ion battery

A conductive polymer, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor reversibility, poor electronic conductivity, and low utilization rate of active material S, and achieve the effects of cheap raw materials and simple preparation.

Inactive Publication Date: 2010-06-16
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The electronic conductivity of the element S is extremely poor. When used as a positive electrode material, the utilization rate of the active material S is not high, the reversibility is poor, and the capacity continues to decline; and with the progress of the electrode reaction, Li 2 The S passivation layer will react with the S dissolved in the electrolyte to generate Li 2 S 2 , which leads to the dissociation of the passivation layer and the formation of soluble polysulfides, which ultimately affects the stability of the electrolyte.

Method used

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  • Preparation method of vulcanized conducting polymer composite anode for lithium ion battery
  • Preparation method of vulcanized conducting polymer composite anode for lithium ion battery
  • Preparation method of vulcanized conducting polymer composite anode for lithium ion battery

Examples

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Embodiment 1

[0038] The first step: adding poly(aniline-pyrrole) powder, sublimed sulfur and absolute ethanol into a ball mill and milling for 10 minutes to obtain the first mixed raw material;

[0039] The second step: put the mixed raw materials obtained in the first step into the glass boat of the tube furnace, pass nitrogen into the glass boat to remove the air; and keep it warm for 2 hours; then heat it up to 250° C. at a heating rate of 10° C. / min and hold it for 5 hours to prepare a sulfurized poly(aniline-pyrrole) composite (positive electrode active material).

[0040] The third step: adding the positive electrode active material, conductive agent, binder and n-propanol aqueous solution with a concentration of 20% by mass into a ball mill and milling for 10 minutes to obtain the second mixed raw material;

[0041] Dosage: Add 7.2g of positive electrode active material, 3.6g of conductive agent, and 6g of binder to 100ml of n-propanol aqueous solution;

[0042] The conductive agen...

Embodiment 2

[0052] The first step: adding poly(aniline-pyrrole) powder, sublimed sulfur and absolute ethanol into a ball mill and milling for 5 minutes to obtain the first mixed raw material;

[0053] The second step: put the mixed raw material obtained in the first step into the glass boat of the tube furnace, pass nitrogen into the glass boat to remove the air; Keeping it warm for 2 hours; then raising the temperature to 200° C. and keeping it warm for 5 hours to prepare a sulfurized poly(aniline-pyrrole) composite (positive electrode active material).

[0054] The third step: adding the positive electrode active material, conductive agent, binder and n-propanol aqueous solution with a concentration of 20% by mass into a ball mill and milling for 5 minutes to obtain the second mixed raw material;

[0055] Dosage: Add 8.4g of positive electrode active material, 3g of conductive agent, and 9g of binder to 100ml of n-propanol aqueous solution;

[0056] The conductive agent is carbon black...

Embodiment 3

[0065] The first step: adding poly(aniline-pyrrole) powder, sublimed sulfur and absolute ethanol into a ball mill and milling for 15 minutes to obtain the first mixed raw material;

[0066] The second step: put the mixed raw materials obtained in the first step into the glass boat of the tube furnace, pass nitrogen into the glass boat to remove the air; Keeping it warm for 2 hours; then raising the temperature to 300° C. and keeping it warm for 5 hours to prepare a sulfurized poly(aniline-pyrrole) composite (positive electrode active material).

[0067] The third step: adding the positive electrode active material, conductive agent, binder and n-propanol aqueous solution with a concentration of 20% by mass into a ball mill and milling for 10 minutes to obtain the second mixed raw material;

[0068] Dosage: Add 9.6g of positive electrode active material, 1.8g of conductive agent, and 3g of binder to 100ml of n-propanol aqueous solution;

[0069] The conductive agent is acetyle...

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Abstract

The invention discloses a preparation method of a vulcanized conducting polymer composite anode for a lithium ion battery. In the method, a conducting polymer of polyaniline-pyrrole is used as a main substrate, sulphur is a main active substance, the simple substance of sulphur and the conducting polymer of polyaniline-pyrrole are compounded at different temperatures by using a co-hot method, and the granularity of the powder can reach a micron size, a submicron size and a nanometer size. The anode material prepared by the method has the initial discharge capacity of 1144 mAh / g under the conditions that the constant current density is 0.2 mA / cm<2>, the charging voltage upper limit is 3.0 V, and the charging voltage lower limit is 1.5 V, and the specific capacity still maintains 929 mAh / g after 20 times of circulation. It can be seen from a CV curve that the vulcanized conducting polymer composite anode material at 250 DEG C has high capacity reversibility and favorable cyclical stability.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for preparing a vulcanized conductive polymer composite cathode material for lithium-ion batteries. Background technique [0002] In recent decades, with the rapid development of the battery industry, the specific energy of secondary batteries is also increasing, from 30 to 40Wh / kg for lead-acid batteries, 40 to 50Wh / kg for nickel-cadmium batteries, and 60 for nickel-hydrogen batteries. ~80Wh / kg, developed to commercial lithium-ion batteries in the 1990s reached 100~130Wh / kg, and has now reached 200Wh / kg. Lithium secondary battery consists of three parts: positive electrode, negative electrode and electrolyte. The battery chemical system determines the electrochemical reaction of the battery, thereby determining the theoretical voltage, theoretical specific capacity and theoretical specific energy of the battery. Lithium-ion batteries use carbon as the negative elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1399H01M4/60C08L79/02C08L79/04C08L71/02C08L27/16C08K3/04
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 张世超邱琳琳
Owner BEIHANG UNIV
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