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Lithium-ion battery, preparation method thereof, and charging method of lithium-ion battery

A lithium-ion battery and electrolyte technology, applied in secondary battery charging/discharging, electrolyte battery manufacturing, secondary batteries, etc., can solve the problem of restricting the application of high-energy density batteries, affecting the cycle performance of lithium-ion batteries, and affecting lithium-ion batteries Liquid retention and other issues to achieve the effect of improving cycle performance, reducing polarization, and good cycle performance

Inactive Publication Date: 2017-09-29
HYB BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the higher the capacity of the battery, the worse the cycle of the battery will be under the limited capacity of the battery case
[0003] Generally, the method for developing high-capacity batteries is to compact the negative electrode sheet of lithium-ion batteries and use high-energy-density materials, but after the negative electrode sheet is compacted, there are few gaps on the surface of the negative electrode sheet, and it is difficult for the electrolyte to infiltrate the electrode sheet. If it goes internally, it will seriously affect the liquid retention capacity of the lithium-ion battery; and it will cause the penetration of the electrolyte to be too slow, resulting in a very large concentration polarization when the battery is formed, which will seriously affect the cycle performance of the lithium-ion battery
[0004] Due to the general compaction and high surface density of the negative electrode of high-energy-density lithium-ion batteries, the electrolyte penetration is insufficient or the solid electrolyte interfacial film (SEI) is not completely formed, resulting in poor cycle performance of the battery, especially for high-energy-density cylinders. Lithium-ion batteries, which largely restrict the application of high energy density batteries

Method used

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  • Lithium-ion battery, preparation method thereof, and charging method of lithium-ion battery
  • Lithium-ion battery, preparation method thereof, and charging method of lithium-ion battery
  • Lithium-ion battery, preparation method thereof, and charging method of lithium-ion battery

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preparation example Construction

[0063] like figure 2 As shown, the preparation method of a lithium-ion battery in one embodiment can be used to prepare the above-mentioned lithium-ion battery, and the preparation method of the lithium-ion battery includes the following steps:

[0064] Step S210: coating the two opposite surfaces of the substrate to form a first mixture layer and a second mixture layer respectively. Wherein, the material of the first mixture layer and the second mixture layer is a mixture of polyvinylidene fluoride and oxide, and the oxide is selected from at least one of alumina, zirconia and titanium dioxide.

[0065] Further, such as image 3 As shown, the steps of coating and forming the first mixture layer and the second mixture layer on the two opposite surfaces of the substrate are specifically:

[0066] Step S212: dissolving polyvinylidene fluoride in an organic solvent to obtain an organic solution of polyvinylidene fluoride with a mass percent concentration of 3%-5%. Wherein, th...

Embodiment 1

[0099] The preparation steps of the lithium ion battery of the present embodiment are as follows:

[0100] (1) Preparation of positive electrode:

[0101] First, prepare modified lithium cobaltate: dissolve cobalt nitrate, lithium nitrate and magnesium nitrate in an aqueous solution with a mass percent concentration of 50% citric acid according to a mass ratio of 1:1:0.2 to obtain a sol; then place the above sol in Dry at 100°C to obtain a gel, which is ground and sintered at 860°C for 12 hours to obtain magnesium-doped lithium cobaltate; then dissolve polyacrylic acid in deionized water to obtain an aqueous solution of polyacrylic acid. Magnesium carbonate is added in the aqueous solution, obtains transparent solution, and wherein, the mol ratio of the carboxyl in the transparent solution and the magnesium element in magnesium carbonate is 2.5:1; The molar ratio of the elements is 1:0.004, adding magnesium-doped lithium cobaltate to the transparent solution to obtain a slurr...

Embodiment 2

[0117] The preparation steps of the lithium ion battery of the present embodiment are as follows:

[0118] (1) Preparation of positive electrode:

[0119] First, prepare modified lithium cobaltate: dissolve cobalt nitrate, lithium nitrate and aluminum nitrate in an aqueous solution with a mass percentage concentration of 50% citric acid according to a mass ratio of 1:1:0.3 to obtain a sol; then put the above sol in Dry at 110°C to obtain a gel. After grinding, sinter at 850°C for 11 hours to obtain aluminum-doped lithium cobaltate; then dissolve polyacrylic acid in deionized water to obtain an aqueous solution of polyacrylic acid. In the polyacrylic acid Add zirconium carbonate in the aqueous solution, obtain transparent solution, wherein, the molar ratio of the carboxyl group in the transparent solution and the zirconium element in zirconium carbonate is 2.4:1; The molar ratio of the elements is 1:0.003, adding aluminum-doped lithium cobaltate to the transparent solution to ...

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Abstract

A lithium ion battery, comprising a positive electrode, a negative electrode, an electrolyte, and a separator between the positive electrode and the negative electrode, the positive electrode, the negative electrode, and the separator are soaked in the electrolyte, and the separator includes a first organic layer, a first mixture layer, and a substrate stacked in sequence , the second mixture layer and the second organic layer, wherein the first organic layer and the second organic layer are porous structures, the materials of the first organic layer and the second organic layer are both polyvinylidene fluoride, the first mixture layer and the second The material of the two mixture layers is a mixture of polyvinylidene fluoride and oxide, and the oxide is selected from at least one of aluminum oxide, zirconium oxide and titanium dioxide. The above-mentioned lithium ion battery has good cycle performance and safety performance. In addition, a preparation method of the lithium ion battery and a charging method of the lithium ion battery are also provided.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a lithium ion battery, a preparation method thereof, and a charging method for the lithium ion battery. Background technique [0002] With the emergence of smart phones and tablet computers, people have higher and higher requirements for the capacity of lithium-ion batteries, and the battery life is required to be longer and longer. However, the higher the capacity of the battery, the worse the cycle of the battery will be under the limited capacity of the battery case. [0003] Generally, the method for developing high-capacity batteries is to compact the negative electrode sheet of lithium-ion batteries and use high-energy-density materials, but after the negative electrode sheet is compacted, there are very few voids on the surface of the negative electrode sheet, and it is difficult for the electrolyte to infiltrate the electrode sheet. Internally, it seriously affects t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/058H01M10/44
CPCH01M10/0525H01M10/058H01M10/44H01M50/411H01M50/446H01M50/449Y02E60/10Y02P70/50
Inventor 岳娟胡清平冯洪亮冯岸柏杨禹超冯艺丰
Owner HYB BATTERY
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