Anode material capable of being used for lithium-iodine cell and preparation method thereof

A positive electrode material and battery technology, applied in the field of electrochemistry, can solve the problems of high internal resistance, high raw material cost, and high heating temperature of lithium-iodine batteries, and achieve the effects of low cost, simple preparation method, and good electrochemical performance

Inactive Publication Date: 2011-01-19
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large internal resistance of the lithium-iodine battery during the discharge process, it has the problem of low discharge rate.
Many scientific researchers have proposed improved methods, including the pre-coating method of the negative electrode, the granular positive electrode method, the nanoscale positive electrode method, etc., but it is still not ideal, only at about 20mA / cm 2 Good discharge performance at high current density
At the same time, the most commonly used I for lithium-iodine batteries 2 / P2VP system has the disadvantages of high raw material cost, high heating temperature and long time consumption during preparation

Method used

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  • Anode material capable of being used for lithium-iodine cell and preparation method thereof
  • Anode material capable of being used for lithium-iodine cell and preparation method thereof
  • Anode material capable of being used for lithium-iodine cell and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0012] Preparation of a series of iodine-containing cathode materials LiI(HPN) by a simple heating method 2 -xI 2 (10≥x≥0.1). The color of the material changes with the iodine content. The color changes from dark yellow when the iodine content is low to bright gold when x=0.6. Continue to increase the iodine content to x≥2, and the material color turns gray-black with a certain Metallic luster.

[0013] According to different x values ​​(10≥x≥0.1) during preparation, weigh the corresponding weight ratio of LiI(HPN) 2 and elemental I 2 , heated in an oil bath at different temperatures (90 to 135 degrees Celsius) for 0.5 to 1 hour. For example, to prepare a positive electrode material with x=0.1: weigh LiI(HPN) with a weight ratio of 10.9:1 2 with I 2 After mixing and grinding evenly, heat and stir in an oil bath at 135 degrees Celsius for 1 hour, and obtain LiI(HPN) after cooling 2 -0.1I 2 Sample; preparation of positive electrode material with x=3: weigh LiI(HPN) with...

Embodiment 2

[0015] Weigh iodine content x=1 (i.e. LiI(HPN) 2 -I 2 ) of material 0.08g, pressed to an area of ​​1cm under a pressure of 500kpa 2 The positive electrode disk, and then the positive electrode disk is directly contacted with the lithium sheet to form a lithium-iodine battery.

[0016] X-ray diffraction measurements show that LiI(HPN) 2 -0.6I 2 The positive electrode material is a kind of different from LiI(HPN) 2 The new structure of the new substance with a good crystal state (attached figure 1 ). to LiI(HPN) 2 -I 2 The electrochemical performance test results of the lithium-iodine battery composed of positive electrode materials are as follows: the lithium-iodine battery is discharged under the load of 40kΩ and 20kΩ respectively, and has good discharge performance, and the current density is about 65mA / cm 2 and 100 mA / cm 2 (attached figure 2 ). The specific capacity under 40kΩ load is 35mAh / g, that is, the formation of LiI(HPN) 2 -I 2 Cathode materials with sim...

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Abstract

The invention belongs to the technical field of electrochemistry, and in particular discloses an anode material capable of being used for a lithium-iodine cell and a preparation method thereof. The anode material is prepared by heating, melting and reacting iodine monomer and LiI(3-hydroxypropionitrile)2 (LiI(HPN)2) and recorded as LiI(HPN)2-xI2, wherein x is greater than or equal to 0.1 and less than or equal to 10. A battery is formed by directly contacting the material LiI(HPN)2-xI2 serving as an anode with metal lithium, and the material LiI(HPN)2-xI2 has high discharge performance, particularly the material with x greater than or equal to 0.6. The theoretical specific capacity of the LiI(HPN)2-I2 is 101mAh / g; the theoretical specific capacity of LiI(HPN)2-3I2 is 155mAh / g; and the capacity increases along with increase in proportion of the monomer iodine. The anode material has the advantages of high specific capacity, simple preparation method and low cost and is applicable to full solid-state lithium-iodine batteries.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a positive electrode material and a preparation method which can be used for lithium batteries. Background technique [0002] Since 1972, lithium-iodine batteries have been used in micro-power electronic devices such as cardiac pacemaker batteries for a long time, and have the advantages of high safety and small self-discharge. Due to the large internal resistance of the lithium-iodine battery during the discharge process, it has the problem of low discharge rate. Many scientific researchers have proposed improved methods, including the pre-coating method of the negative electrode, the granular positive electrode method, the nanoscale positive electrode method, etc., but it is still not ideal, only at about 20mA / cm 2 It has good discharge performance at a high current density. At the same time, the most commonly used I for lithium-iodine batteries 2 The / P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397C07F1/02
CPCY02E60/122Y02E60/10
Inventor 刘方超傅正文
Owner FUDAN UNIV
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