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Preparation method of cathode material coated with carbon in situ with carbon sulfide

A metal sulfide, in-situ coating technology, applied in negative electrodes, active material electrodes, battery electrodes, etc., can solve problems such as complex experimental methods, achieve simple preparation methods, great development potential and application prospects, and good electrochemical performance effect

Inactive Publication Date: 2019-04-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above improved method improves the performance of FeSx@C battery to a certain extent, but the experimental method is relatively complicated.

Method used

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  • Preparation method of cathode material coated with carbon in situ with carbon sulfide
  • Preparation method of cathode material coated with carbon in situ with carbon sulfide
  • Preparation method of cathode material coated with carbon in situ with carbon sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mix ferrocene and S powder in a certain proportion.

[0028] (2) Put the mixed powder in a mortar and grind it to make it evenly mixed.

[0029] (3) Put the ground mixed powder in a porcelain boat, put it into an atmosphere furnace, perform high-temperature treatment, and lower it to room temperature to obtain FeSx@C anode material.

[0030] The above-mentioned preparation method is described in detail below:

[0031] The ratio of ferrocene to S in step 1 of the present invention is 1:6.

[0032] The high temperature treatment condition described in step 3 is: N 2 Atmosphere, the temperature was raised to a constant temperature of 650°C at a rate of 5°C / min, and the mixture powder was calcined for 3 hours during the constant temperature process.

[0033] The FeSx@C material prepared in Example 1 is used as the negative electrode material, PVDF is used as the binder, and acetylene black is used as the conductive agent, and weighed according to a certain ratio (act...

Embodiment 2

[0035] (1) Mix ferrocene and S powder in a certain proportion.

[0036] (2) Put the mixed powder in a mortar and grind it to make it evenly mixed.

[0037] (3) Put the ground mixed powder in a porcelain boat, put it into an atmosphere furnace, perform high-temperature treatment, and lower it to room temperature to obtain FeSx@C anode material.

[0038] The above-mentioned preparation method is described in detail below:

[0039] The ratio of ferrocene to S in step 1 of the present invention is 1:4.

[0040] The high temperature treatment condition described in step 3 is: N 2 Atmosphere, the temperature was raised to a constant temperature of 650°C at a rate of 5°C / min, and the mixture powder was calcined for 3 hours during the constant temperature process.

[0041] The FeSx@C material prepared in Example 1 is used as the negative electrode material, PVDF is used as the binder, and acetylene black is used as the conductive agent, and weighed according to a certain ratio (activ...

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Abstract

The invention relates to a preparation method of a cathode material coated with carbon in situ with carbon sulfide and belonges to the technical field of batteries. An iron source and an S source aremixed in proportion; the mixed powder is placed in a mortar to be ground and uniformly mixed; the ground mixed powder is placed in a porcelain boat, the boat is placed in an atmosphere furnace and subjected to high temperature treatment, and cooling is executed to room temperature to obtain a FeSx@C cathode material. The FeSx@C material synthesized by the method has good electrochemical performance and has high specific capacity; for lithium ion batteries, especially under high rate charge and discharge, the capacity can be maintained at 1000 mAh / g after 100 cycles, and good cyclicity is showned; for sodium ion batteries, the first-circle discharge capacity is as high as 816 mAh / g and is a high specific capacity in sodium batteries.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a preparation method of a metal sulfide in-situ coated carbon negative electrode material for FeSx lithium (sodium) ion batteries. Background technique [0002] Electrochemical battery is an efficient and stable energy storage system. Lithium-ion batteries are widely used due to their advantages such as high specific energy, long cycle life, high discharge specific capacity, stable voltage, low consumption, no pollution, and excellent low temperature performance. Electric vehicles, mobile phone batteries and other mobile devices. However, the price of metal lithium is relatively high. In order to reduce production costs, searching for other electrode materials has always been a research hotspot. Sodium and lithium are elements of the same group, have similar chemical properties, and are relatively cheap and abundant in reserves. Therefore, Na-ion batteries are regarded as a ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M10/0525
CPCH01M4/364H01M4/38H01M4/5815H01M10/0525H01M2004/027Y02E60/10
Inventor 张丽娟郭雨萌梁菊梅张伶潇希利德格
Owner BEIJING UNIV OF TECH
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