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Polypyrrole coated hard carbon cathode material and preparation method thereof

A negative electrode material, polypyrrole technology, used in battery electrodes, electrical components, circuits, etc., can solve the problem of not meeting the needs of high energy density of power batteries, improve conductivity and active material utilization, improve specific capacity, Simple and stable preparation process

Inactive Publication Date: 2015-03-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the theoretical specific capacity of carbon materials is only 372 mAh / g, which cannot meet the demand for high energy density of power batteries.

Method used

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  • Polypyrrole coated hard carbon cathode material and preparation method thereof
  • Polypyrrole coated hard carbon cathode material and preparation method thereof
  • Polypyrrole coated hard carbon cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weighed 21.4 g of anhydrous glucose and dissolved it in 70 mL of deionized water, and obtained a mixed aqueous glucose solution after 30 min of ultrasonic dispersion and 30 min of magnetic stirring. Transfer the mixed solution into a hydrothermal reaction kettle, and place the hydrothermal reaction kettle in an oven. Raise the temperature to 160°C and keep it warm for 10h. After the hydrothermal reaction is finished, the reactor is rapidly cooled with cold water. The hydrothermal product was suction-filtered and washed three times with absolute ethanol and deionized water, and then placed in a freeze dryer for cooling and drying at -46°C. Spread the freeze-dried precursors in the ark, and place the ark in the constant temperature zone of the tube furnace. First, Ar (50 mL / min) was introduced to remove the air in the tube furnace for 15 min, and then the temperature was raised to 800 °C at 10 °C / min, and held for 8 h for carbonization. After the reaction was completed...

Embodiment 2

[0019] The steps of this example are the same as Example 1, except that the hydrothermal reaction time of step 1) is increased from 10h to 12h, and the hydrothermal reaction temperature is increased from 160°C to 180°C, and the obtained polypyrrole-coated hard carbon negative electrode material The medium-hard carbon matrix is ​​ellipsoidal, with a particle size of 100-200 nm. The measured specific capacity of the negative electrode material is slightly lower than that of the polypyrrole-coated hard carbon material prepared in Example 1, and the specific capacity of each cycle is 20-40 mAh / g lower than that of Example 1.

Embodiment 3

[0021] The steps of this example are the same as those of Example 1, except that the mass ratio of hard carbon to polypyrrole in step 2) is controlled to 2:1. In the obtained polypyrrole-coated hard carbon negative electrode material, the integrity of the coating layer of polypyrrole is low, and the measured specific capacity of the negative electrode material is slightly lower than that of the polypyrrole-coated hard carbon material prepared in Example 1. Each The specific capacity of the cycle is 30-50 mAh / g lower than that of Example 1.

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Abstract

The invention discloses a polypyrrole coated hard carbon cathode material and a preparation method thereof. The polypyrrole coated hard carbon cathode material adopts a hard carbon sphere as the substrate, which is coated with a polypyrrole layer. The preparation process comprises: taking glucose as the carbon source, preparing a hard carbon sphere material by a hydrothermal calcination method, taking ferric chloride hexahydrate as the oxidant, and preparing the polypyrrole coated hard carbon cathode material by an in-situ chemical oxidation method. The process involved in the invention is simple, has good repeatability, and has no need of adding additives. The prepared composite material has good electrical conductivity, thus being in favor of bringing the electrochemical performance of the lithium ion battery cathode material into play.

Description

technical field [0001] The invention relates to a polypyrrole-coated hard carbon negative electrode material and a preparation method thereof, belonging to the preparation technology of lithium ion battery negative electrode materials. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, the research and development of new energy has become an important way to solve these problems. As a new type of electrochemical battery, lithium-ion battery has the characteristics of large capacity, fast charge and discharge, long service life, excellent safety performance and non-toxicity, and has become a strong competitor for new energy secondary batteries, especially power batteries. . As a commonly used lithium-ion battery anode material, carbon materials occupy a major position in the lithium-ion battery anode material market due to its low cost, simple preparation process, and good cycle stability. Compared with graphite, hard carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/137H01M4/133H01M4/1393H01M4/1399
CPCH01M4/133H01M4/137H01M4/1393H01M4/1399H01M4/587H01M4/624Y02E60/10
Inventor 师春生张远航赵乃勤刘恩佐何春年
Owner TIANJIN UNIV
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