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Positive electrode material used for lithium-iodine battery

A positive electrode material and battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of easy volatilization, increasing difficulty, and low Coulombic efficiency

Active Publication Date: 2017-08-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lithium-iodine batteries have the above advantages over traditional lithium-ion batteries, lithium-iodine batteries still face a series of problems. "Shuttle effect", resulting in poor cycle performance and low Coulombic efficiency of lithium-iodine batteries
In addition, elemental iodine is extremely volatile, which increases the difficulty of using it as a positive electrode active material for lithium batteries.

Method used

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  • Positive electrode material used for lithium-iodine battery
  • Positive electrode material used for lithium-iodine battery
  • Positive electrode material used for lithium-iodine battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Positive electrode preparation: PVP-I 2 0.5g, Ketjen black 0.2g, reduced graphene oxide 0.02g ball mill and mix evenly. Take 0.15g of the above mixture and 0.026g of PTFE, and after thorough grinding, prepare a positive electrode. From figure 1 It can be seen that the purchased PVP-I 2 It is granular, ranging in size from tens of microns to hundreds of microns. From figure 2 It can be seen that the prepared cathode materials are mixed uniformly.

[0047] Battery assembly: The above-mentioned positive electrode material is directly used as a battery pole piece to assemble a lithium battery. The voltage-capacity diagram of the material in the second cycle of charging and discharging at 0.2C is as follows image 3 shown. It can be seen from the figure that the discharge curve of the material has two discharge plateaus. The first platform is between 3.3-3.4V, and the second platform is around 2.9V. The charge-discharge cycle performance of the material at 0.5C is...

Embodiment 2

[0049] Positive electrode preparation: 1.2g PVP-I 2 Dissolved in 8ml of ethanol, prepared as solution A. After immersing the purchased carbon cloth in solution A for 12 h, the carbon cloth was taken out and vacuum-dried at room temperature to obtain the positive electrode material. From Figure 5 It can be seen that PVP-I 2 Uniformly attached to the surface of the carbon cloth or in the holes.

[0050] Battery assembly: The above-mentioned positive electrode material is directly used as a battery pole piece to assemble a lithium battery. The charge-discharge cycle performance of the material at 0.5C is as follows: Figure 6 shown. It can be seen from the figure that the initial discharge specific capacity of the material is 180mAh g -1 Above, after 500 cycles, its discharge specific capacity still remains at 100mAh g -1 above. In addition, its Coulombic efficiency is maintained above 99%, indicating that the shuttle effect of polyiodide anions generated during charge a...

Embodiment 3

[0052] Positive electrode preparation: PVP-I 2 0.5g, superconducting carbon black 0.2g ball mill and mix evenly. Take 0.15g of the above mixture and 0.05g of PTFE, and after thorough grinding, prepare a positive electrode.

[0053] Battery assembly: The above-mentioned positive electrode material is directly used as a battery pole piece to assemble a lithium battery.

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Abstract

The invention discloses a positive electrode material used for a lithium-iodine battery, and specifically provides a composite material which can be used as a positive electrode active material of the lithium-iodine battery. The composite material comprises polymer high molecules and active material iodine, and one or more kinds of acting force of chemical bonds, hydrogen bonds and Van der Waals' force can be formed between the polymer high molecules and active material iodine. When the composite material is used as the active material for preparing the positive electrode material and applied to the lithium-iodine battery, relatively high coulombic efficiency and excellent cycling stability can be represented.

Description

technical field [0001] The invention relates to the technical field of application of positive electrode active materials, in particular to a positive electrode material for lithium-iodine batteries, which is based on polymer polymer / iodine composite materials used as positive electrodes in lithium batteries. Background technique [0002] Since the lithium cobalt oxide battery system was developed in the 1990s, lithium batteries have developed rapidly. At present, it is widely used in portable electronic devices, electric vehicles, unmanned aircraft and other fields. However, with the continuous progress of society and the continuous development of science and technology, people's demand for energy storage equipment is also increasing. As a potential cathode material for lithium batteries, iodine element is relatively abundant in nature, and the cost is low (50-60 μg of iodine per liter of seawater), which can meet people's demand for sustainable energy storage. In additio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/628Y02E60/10
Inventor 田华军孟振韩伟强
Owner ZHEJIANG UNIV
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