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High-capacity/high-first-effect red phosphorus-molecular sieve template carbon composite negative electrode material as well as preparation method and application thereof

A technology of negative electrode material and composite material, which is applied in the field of red phosphorus-molecular sieve template carbon composite negative electrode material and its preparation, can solve the problems of deterioration of battery cycle performance and low electrical conductivity, and achieves the effect of good electrical conductivity and avoiding volume effect.

Pending Publication Date: 2020-12-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the intrinsic conductivity of red phosphorus is very low, only 1×10 -14 S cm -1 , the huge volume effect in the process of charging and discharging makes the SEI film break and form continuously, resulting in the rapid deterioration of the battery cycle performance

Method used

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  • High-capacity/high-first-effect red phosphorus-molecular sieve template carbon composite negative electrode material as well as preparation method and application thereof
  • High-capacity/high-first-effect red phosphorus-molecular sieve template carbon composite negative electrode material as well as preparation method and application thereof
  • High-capacity/high-first-effect red phosphorus-molecular sieve template carbon composite negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of molecular sieve template carbon

[0034] Using 5g Y-type zeolite molecular sieve as a template, 50mL furfuryl alcohol was impregnated with 50mL furfuryl alcohol for 10h under vacuum at 350°C. Furfuryl alcohol was deposited and polymerized in the channel of zeolite molecular sieve, and the treated mixture was filtered to obtain polyfurfuryl alcohol / zeolite composite material. The composite material was put into the reactor, and the reactor was purged with argon, and kept at 80 °C for 24 h; then the reaction temperature was increased at 5 °C min -1 The heating rate was raised to 150°C and kept for 8h; then the reaction temperature was increased at 5°C min -1 The heating rate was increased to 700°C, the gas flow was switched to propylene, and the gas flow was switched to argon after 4 hours of vapor deposition, and the temperature was continued to rise to 900°C in an argon atmosphere, kept for 3 hours, and then naturally cooled to room temperature and th...

Embodiment 2

[0045] (1) Preparation of molecular sieve template carbon

[0046] Using 5g Y-type zeolite molecular sieve as a template, 50mL furfuryl alcohol was impregnated with 50mL furfuryl alcohol for 10h under vacuum at 350°C. Furfuryl alcohol was deposited and polymerized in the channel of zeolite molecular sieve, and the treated mixture was filtered to obtain polyfurfuryl alcohol / zeolite composite material. The composite material was put into the reactor, and the reactor was purged with argon, and kept at 80 °C for 24 h; then the reaction temperature was increased at 5 °C min -1 The heating rate was raised to 150°C and kept for 8h; then the reaction temperature was increased at 5°C min -1 The heating rate was increased to 800°C, the gas flow was switched to propylene, and the gas flow was switched to argon after 4 hours of vapor deposition, and the temperature was continued to rise to 900°C in an argon atmosphere, kept for 3 hours, and then naturally cooled to room temperature and th...

Embodiment 3

[0054] (1) Preparation of molecular sieve template carbon

[0055] The preparation process is the same as in Example 1.

[0056] (2) Preparation of red phosphorus-molecular sieve template carbon composites

[0057] The preparation process is the same as in Example 1.

[0058] (3) Preparation of red phosphorus-molecular sieve template carbon composite electrode

[0059] The preparation process is the same as in Example 1.

[0060] (4) Assembling sodium-ion batteries

[0061] The composite electrode prepared above is assembled with metal sodium in a glove box filled with argon to form a CR2032 sodium-ion battery, and the electrolyte of the sodium-ion battery is 1M NaClO 4 The PC / EC carbonate electrolyte is used, and the diaphragm is made of Glass fiber (Whatman).

[0062] Use the Wuhan Landian battery test system to conduct a constant current discharge test on the above-mentioned sodium-ion battery in a 30°C incubator, and the test current density of the sodium-ion battery ...

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Abstract

The invention provides a high-capacity / high-first-effect red phosphorus-molecular sieve template carbon composite negative electrode material and a preparation method thereof. The composite negative electrode material comprises nano-dispersed red phosphorus and molecular sieve template carbon, and the molecular sieve template carbon is used as a porous carrier of electrochemically active red phosphorus and has a high specific surface area and a large pore volume. The composite negative electrode material is prepared from the following raw materials in parts by weight: 30-90 parts of red phosphorus; and 10-70 parts of molecular sieve template carbon. The red phosphorus -molecular sieve template carbon composite material provided by the invention is mainly used as a negative electrode material of a sodium ion battery or a potassium ion battery, and has high charge-discharge specific capacity and high first effect. In addition, the material also has good cycling stability. Therefore, thesodium / potassium ion battery disclosed by the invention has a good application prospect in the fields of renewable energy consumption, peak load shifting, distributed energy storage power stations andother large-scale energy storage.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a high-capacity / high-first-efficiency red phosphorus-molecular sieve template carbon composite negative electrode material and its preparation method and application. Background technique [0002] With the development of human society, lithium-ion batteries are widely used in portable devices, electric vehicles and other fields. However, the scarcity and high cost of lithium resources limit their further application in large-scale energy storage. In addition, due to the low deposition potential of lithium, lithium dendrites may be formed during the charging and discharging process of lithium-ion batteries, which brings great safety hazards. Therefore, sodium-ion batteries and potassium-ion batteries are increasingly favored by researchers. Sodium-ion batteries and potassium-ion batteries have a "rocking chair" working mechanism similar to lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/366H01M4/38H01M4/625H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 谢智中胡宇飞刘丹屈德宇方衎
Owner WUHAN UNIV OF TECH
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