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C/Fe3C lithium ion battery negative material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low theoretical capacity of graphite-based negative electrodes, poor high-current charge and discharge performance, and potential safety hazards, and achieve the time-consuming preparation process Short, stable, and easy-to-storage effects

Inactive Publication Date: 2011-04-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the theoretical capacity of graphite-based negative electrodes is low (LiC 6 , 372mAhg -1 ); and the discharge platform is too low (0 ~ 0.25V), there are potential safety hazards; in addition, the performance of high current charging and discharging is poor

Method used

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  • C/Fe3C lithium ion battery negative material and preparation method thereof
  • C/Fe3C lithium ion battery negative material and preparation method thereof
  • C/Fe3C lithium ion battery negative material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weighing about 0.56 g of monomeric iron phthalocyanine, 0.24 g of pyrazine and 0.028 g of sodium lauryl sulfate were dissolved in 35 mL of N,N-dimethylformamide, and stirred ultrasonically for 15 minutes;

[0029] (2) Transfer the liquid obtained in step (1) into a polytetrafluoroethylene liner reactor, and then place the reactor in an oven at 160° C. for 4 hours;

[0030] (3) After the reaction kettle in step (2) is naturally cooled, the product is rotary-evaporated in a water bath at 80° C. to obtain a purple-black powdery substance, namely polymerized iron phthalocyanine;

[0031] (4) Heat-treat the polymerized iron phthalocyanine obtained in step (3) at 700°C for 1.0 hour in an argon atmosphere with a purity of 99.9993% to obtain the final product, namely C / Fe 3 C Lithium-ion battery anode material.

Embodiment 2

[0033] (1) Weigh about 0.56 g of monomeric iron phthalocyanine, 0.24 g of pyrazine and 0.028 g of cetyltrimethylammonium bromide and dissolve them in 35 mL of N, N-dimethylformamide, and stir them ultrasonically for 30 minute;

[0034] (2) Transfer the liquid obtained in step (1) into a polytetrafluoroethylene liner reactor, and then place the reactor in an oven at 160° C. for 4 hours;

[0035] (3) After the reaction kettle in step (2) is naturally cooled, the product is rotary-evaporated in a water bath at 80° C. to obtain a purple-black powdery substance, namely polymerized iron phthalocyanine;

[0036] (4) Heat-treat the polymerized iron phthalocyanine obtained in step (3) at 800°C for 1.0 hour in an argon atmosphere with a purity of 99.9993% to obtain the final product, namely C / Fe 3 C Lithium-ion battery anode material.

Embodiment 3

[0038] (1) Weigh about 0.56 g of monomeric iron phthalocyanine, 0.24 g of pyrazine and 0.056 g of sodium lauryl sulfate, dissolve them in 35 mL of N,N-dimethylformamide, and stir them ultrasonically for 30 minutes;

[0039] (2) Transfer the liquid obtained in step (1) into a polytetrafluoroethylene liner reactor, and then place the reactor in an oven at 160° C. for 4.5 hours;

[0040] (3) After the reaction kettle in step (2) is naturally cooled, the product is rotary-evaporated in a water bath at 80° C. to obtain a purple-black powdery substance, namely polymerized iron phthalocyanine;

[0041] (4) Heat-treat the polymerized iron phthalocyanine obtained in step (3) at 700°C for 1.0 hour in an argon atmosphere with a purity of 99.9993% to obtain the final product, namely C / Fe 3 C Lithium-ion battery anode material.

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Abstract

The invention relates to a C / Fe3C lithium ion battery negative material and a preparation method thereof, which belong to the field of the lithium ion battery negative material and electrochemistry. The lithium ion battery negative material consists of amorphous carbon and Fe3C. The preparation method of the material comprises the following steps of: dissolving iron phthalocyanine, pyrazine and asurfactant in an organic solvent for thermal polymerization; and performing heat treatment on a polymerization product in argon atmosphere or performing heat treatment on Prussian blue at a certain temperature under the protection of the argon atmosphere, wherein a discharge voltage platform of the negative material is at 0.75V in average; the reversible specific capacity of the material can be kept at 700mAh / g within a voltage range of between 0.005 and 3.5V at the charge and discharge rate of 100mA / g after 60 cycles and does not obviously attenuate; in addition, the material has high chargeand discharge rate performance and broad application prospect.

Description

technical field [0001] The present invention relates to a kind of C / Fe 3 The invention discloses a lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of lithium ion battery negative electrode materials and electrochemistry. Background technique [0002] Lithium-ion batteries have been widely used in various portable electronic products due to their advantages such as high working voltage, small size, large specific energy, no memory effect, no pollution, small self-discharge, long cycle life and stable discharge performance. However, as the application of lithium-ion batteries expands to areas such as power tools and electric vehicles, higher energy density and power density are required. As a key component of lithium-ion batteries, negative electrode materials play an important role in the generation, development and practical application of lithium-ion batteries. Therefore, it is of great significance to pay attention...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 夏定国乐俊成赵秀芸刘淑珍
Owner BEIJING UNIV OF TECH
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