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Non-carbonate based novel?electrolyte solution?system used for spinel lithium titanate energy storage type lithium ion secondary battery

A technology for lithium lithium titanate and secondary batteries, which is applied in the field of new non-carbonate-based electrolyte systems for lithium-ion secondary batteries with spinel lithium titanate energy storage, and can solve the problems affecting the service life and performance of batteries. Problems such as flatulence, to achieve the effect of prolonging service life and improving stability

Inactive Publication Date: 2013-04-10
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, during the use and storage of this material, due to the side reaction between the electrolyte and the material, the battery will cause flatulence, which will affect the service life and performance of the battery.

Method used

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  • Non-carbonate based novel?electrolyte solution?system used for spinel lithium titanate energy storage type lithium ion secondary battery
  • Non-carbonate based novel?electrolyte solution?system used for spinel lithium titanate energy storage type lithium ion secondary battery
  • Non-carbonate based novel?electrolyte solution?system used for spinel lithium titanate energy storage type lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Li / Li 4 Ti 5 o 12 The system simulates a half-cell, and the specific process is as follows:

[0011] Weigh a certain amount of Li according to the weight percentage 8:1:1 4 Ti 5 o 12 , acetylene black and polyvinylidene fluoride (PVDF), using pyrrolidone as a dispersant, stir and mix them evenly. Using aluminum foil as a current collector, the mixed slurry was rolled into a pole piece with a thickness of 50 microns by a rolling machine. The electrolyte adopts organic electrolyte TEGDME, the electrolyte is 1mol / L LiFSI, and the water content of the obtained electrolyte is lower than 15ppm.

[0012] The battery assembly uses a standard button cell CR2032, and the separator is glass fiber. The entire assembly process is completed in an argon glove box with a moisture content below 0.5ppm. Test results such as figure 1 with 2 And shown in Table 1.

Embodiment 2

[0014] Li / Li 4 Ti 5 o 12 The system simulates a half-cell, and the specific process is as follows:

[0015] Weigh a certain amount of Li according to the weight percentage 8:1:1 4 Ti 5 o 12 , acetylene black and polyvinylidene fluoride (PVDF), using pyrrolidone as a dispersant, stir and mix them evenly. Using copper foil as a current collector, the mixed slurry was rolled into a pole piece with a thickness of 50 microns by a rolling machine. The electrolyte is organic electrolyte TGDME, the electrolyte is 1mol / L LiTFSI, and the water content of the obtained electrolyte is lower than 10ppm.

[0016] The battery assembly uses a standard button cell CR2032, and the separator is glass fiber. The entire assembly process is completed in an argon glove box with a moisture content below 0.5ppm. The test results are shown in Table 1.

Embodiment 3

[0018] Li / LiFePO 4 The system simulates a half-cell, and the specific process is as follows:

[0019] Weigh a certain amount of LiFePO according to the weight percentage 8:1:1 4 , acetylene black and polyvinylidene fluoride (PVDF), using pyrrolidone as a dispersant, stir and mix them evenly. Using aluminum foil as a current collector, the mixed slurry was rolled into a pole piece with a thickness of 50 microns by a rolling machine. The electrolyte adopts organic electrolyte DGDME, the electrolyte is 1mol / L LiFSI, and the water content of the obtained electrolyte is lower than 15ppm.

[0020] The battery assembly uses a standard button cell CR2032, and the separator is glass fiber. The entire assembly process is completed in an argon glove box with a moisture content below 0.5ppm. The test results are shown in Table 1.

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Abstract

The invention relates to a non-carbonate based novel electrolyte solution system used for a spinel lithium titanate energy storage type lithium ion secondary battery. The system is characterized in that: an ether organic solvent is adopted as an electrolyte solution so as to form a non-carbonate electrolyte solution system, which is applied to an energy storage type lithium ion secondary battery with spinel lithium titanate as the negative electrode. By using the?electrolyte solution?of the system, stability of the positive and negative electrode materials and the electrolyte solution in a battery circulation process is substantially improved, thus effectively preventing the gas bulging problem brought about by electrolyte solution decomposition caused by a lithium titanate based material during battery storage and circulation. Therefore, the service life of the battery can be greatly prolonged.

Description

technical field [0001] The invention belongs to the field of battery technology. In particular, it relates to a novel non-carbonate-based electrolyte system for a spinel lithium titanate energy storage type lithium-ion secondary battery. It has broad application prospects in the fields of common secondary lithium ion batteries, power energy batteries and energy storage batteries. Background technique [0002] Lithium-ion batteries have been widely used in small household appliances and portable appliances due to their high operating voltage, large volume and energy density, long service life, no memory effect, no pollution, and low self-discharge. With the miniaturization and portability of electronic equipment, and the emergence and vigorous development of green and environmentally friendly electric vehicles, the lithium-ion battery application market is expanding. In the future, with the rapid development of clean energy and smart grids, lithium-ion batteries will be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569
CPCY02E60/10
Inventor 胡勇胜索鎏敏李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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