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A high-voltage lithium-ion battery with excellent high-temperature performance

A lithium-ion battery, high-voltage technology, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of reducing battery interface impedance, rapid decay of high-temperature cycle performance, and excessive cell expansion, to improve high-temperature Cycling and high temperature storage performance, improving the effect of excessive cell expansion and reducing interface impedance

Active Publication Date: 2022-03-29
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-voltage lithium-ion battery with excellent high-temperature performance in order to solve the existing problems of high-temperature storage gas production, high-temperature cycle performance attenuation, and battery internal resistance increase in existing high-voltage lithium-ion batteries. This kind of lithium-ion battery has excellent high-temperature cycle and high-temperature storage performance under high voltage, and the combined use of the electrolyte and negative electrode binder in the lithium-ion battery can also significantly reduce the interface resistance of the battery, thereby improving the performance of the lithium-ion battery. The problem of excessive expansion of the battery cell due to the increase in internal resistance during the cycle of the ion battery

Method used

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  • A high-voltage lithium-ion battery with excellent high-temperature performance
  • A high-voltage lithium-ion battery with excellent high-temperature performance
  • A high-voltage lithium-ion battery with excellent high-temperature performance

Examples

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preparation example Construction

[0054] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0055] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0057] Preparation of the positive electrode sheet: the chemical formula of 4.4V lithium cobaltate is Li 1.02 co 0.6 Al 0.1 Mg 0.1 mn 0.1 Cr 0.1 o 2 , the positive electrode binder polyvinylidene fluoride (PVDF), and the conductive agent acetylene black are mixed according to the weight ratio of 96.5:2:1.5, N-methylpyrrolidone (NMP) is added, and stirred under the action of a vacuum mixer until the mixed system becomes uniform Fluid positive electrode slurry; evenly coat the positive electrode slurry on aluminum foil with a thickness of 9-12 μm; bake the above-mentioned coated aluminum foil in 5 ovens with different temperature gradients, and then heat it at 100-130 ℃ oven drying for 4-10h, and then roll pressing and cutting to obtain the desired positive electrode sheet.

[0058] The preparation of negative electrode sheet: artificial graphite of negative electrode active material, conductive carbon black, negative electrode binding agent (in the structural formula show...

Embodiment 2

[0063] The difference from Example 1 is that the chemical formula of the active material in the positive electrode is Li 0.99 co 0.8 Al 0.1 Cr 0.1 o 2 . All the other are identical with embodiment 1.

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-voltage lithium-ion battery with excellent high-temperature performance, which includes a positive electrode sheet, a negative electrode sheet, a diaphragm placed between the positive electrode sheet and the negative electrode sheet, and a non-aqueous electrolyte; The positive electrode sheet includes a positive electrode collector and a mixed layer coated thereon that includes a positive electrode active material, a conductive agent, and a positive electrode binder; the negative electrode sheet includes a negative electrode collector and a layer coated thereon that includes a negative electrode active material, A mixed layer of conductive agent and negative electrode binder; the high-voltage lithium-ion battery has a high-voltage cycle of 4.4V at 60°C for 400 times, and the cell capacity retention rate is greater than 70% and the cell expansion rate (thickness change rate) is less than 10%. The lithium ion battery prepared by using the electrolyte additive and the negative electrode binder in combination with positive and negative electrode diaphragm materials can effectively improve the high-temperature cycle and high-temperature storage performance of the high-voltage lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-voltage lithium-ion battery with excellent high-temperature performance. Background technique [0002] In recent years, with the rapid development of electronic products such as smart phones, tablet computers and smart wearables, consumers have higher and higher requirements for the energy density of lithium-ion batteries considering the length of use of electronic products and the different working environments. With the aggravation of the harsh environment of global warming, such as in India, Africa and other special use areas, this requires lithium-ion batteries to have excellent high-temperature cycle and high-temperature storage and other high-temperature performance. [0003] At present, the improvement of the energy density of lithium-ion batteries is mainly achieved through the use of high-voltage lithium cobaltate cathode materials of 4.4...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/62H01M10/0567
CPCH01M10/0567H01M10/0525H01M4/622H01M2004/027Y02E60/10
Inventor 母英迪王龙廖波曾长安王海李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD