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A high-voltage lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problem of deteriorating the long-term high-temperature storage performance of high-voltage lithium-ion batteries, exacerbating metal ion dissolution, thickness expansion and Improve the high-temperature storage characteristics, increase the capacity retention rate, and reduce the increase in internal resistance to solve problems such as large internal resistance growth

Active Publication Date: 2016-01-20
BASF BATTERY MATERIALS SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Its high temperature characteristics are poor, and it is easy to decompose at high temperature to produce free acid (HF), which will easily lead to the thickness expansion and internal resistance increase of the battery after high temperature cycle; at the same time, because it decomposes at high temperature to produce free acid, it will further aggravate the high voltage. The dissolution of metal ions in the positive electrode will further deteriorate the long-term high-temperature storage performance of high-voltage lithium-ion batteries

Method used

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  • A high-voltage lithium-ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation method of the high-voltage lithium-ion secondary battery in this embodiment includes a positive electrode preparation step, a negative electrode preparation step, an electrolyte preparation step, a diaphragm preparation step, and a battery assembly step;

[0052] The positive electrode preparation step is: mix 4.35V high-voltage positive electrode active material lithium cobaltate, conductive carbon black and binder polyvinylidene fluoride at a mass ratio of 95:3:2, and disperse them in N-methyl-2- Pyrrolidone, to obtain the positive electrode slurry, the positive electrode slurry is evenly coated on both sides of the aluminum foil, after drying, calendering and vacuum drying, and after the aluminum lead wire is welded with an ultrasonic welder, the positive electrode plate is obtained. The thickness of the electrode plate is Between 120-150μm;

[0053] The preparation steps of the negative electrode are: mixing graphite, conductive carbon black, binder ...

Embodiment 2

[0071] The preparation method of the electrolyte solution and the preparation method of the lithium ion battery are the same as in Example 1, except that the content of 4-fluorotoluene in the electrolyte solution is reduced from 0.1% to 0.01%. The normal temperature cycle, 45°C cycle and high temperature storage data obtained from the test are shown in Table 1.

Embodiment 3

[0073] The preparation method of the electrolyte solution and the preparation method of the lithium ion battery are the same as in Example 1, except that the content of 4-fluorotoluene in the electrolyte solution is increased from 0.1% to 0.5%. The normal temperature cycle, 45°C cycle and high temperature storage data obtained from the test are shown in Table 1.

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Abstract

The invention discloses a high-voltage lithium ion secondary battery. The high-voltage lithium ion secondary battery is characterized in that the charging cut-off voltage is greater than 4.2 V and is less than or equal to 4.5 V. The high-voltage lithium ion secondary battery comprises a cathode, an anode, a partition plate and non-water electrolyte, wherein the active substance of the cathode is a lithium transition metal oxide; the active substance of the anode contains graphite, the partition plate is arranged between the cathode and the anode, the non-water electrolyte comprises a non-water organic solvent, lithium salt and 4-fluorotoluene with a structural formula (I), and the content of the 4-fluorotoluene is 0.01%-1% of the total weight of the electrolyte. The 4-fluorotoluene can effectively improve the cycling property of the electrolyte, the capacity retention ratio of the battery is obviously improved after circulating of the battery, and the internal resistance growth and the thickness expansion rate of the battery are reduced after circulating of the battery; meanwhile, the high-temperature storage characteristic of the battery is improved. The high-voltage lithium ion secondary battery provided by the invention has the advantages that the 4-fluorotoluene is added on the foundation of fluoro diethyl carbonate, the cycling property and the high-temperature storage property of the battery are also effectively improved, and further, the battery is practical.

Description

technical field [0001] The invention relates to the field of designing lithium-ion batteries, in particular to a high-voltage lithium-ion secondary battery with a voltage between 4.35V and 4.5V. Background technique [0002] With the continuous popularization of 3G digital electronic products, it is increasingly required to be miniaturized in size, and the standby time is also required to be longer and longer in use. Therefore, the high-voltage lithium-ion secondary battery as the power supply of current digital electronic products is required to be miniaturized. At present, miniaturized lithium-ion batteries have been widely used in tablet computers, power banks, camcorders, and mobile phones. [0003] Miniaturized lithium-ion batteries must meet the requirements of current digital electronic products, and the development of high-energy-density lithium-ion batteries is an effective way. The development of high energy density lithium-ion batteries is mainly achieved throug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M4/505H01M4/525H01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 石桥林木崇
Owner BASF BATTERY MATERIALS SUZHOU
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