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Lithium ion battery electrolyte, preparation method thereof and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of narrowing the battery operating temperature range, reducing the battery cycle retention rate, and affecting the battery performance. The effect of improving safety and stability performance and cycle life, reducing migration distance and increasing migration speed

Pending Publication Date: 2022-05-31
BATTERO TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The system using EC as the electrolyte performs poorly at low temperatures, mainly because EC is a high-melting point solvent, and its reductive decomposition forms a high-impedance interface phase, which seriously affects battery performance.
For example, narrowing the temperature range of the battery, poor rate performance, and the growing interfacial phase during the cycle reduces the battery cycle retention rate, etc.

Method used

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  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery
  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery
  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery

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preparation example Construction

[0026] A first object of the present invention is to provide a method for preparing a lithium ion battery electrolyte, comprising the following steps:

[0027] (1) LiPF is dissolved in the mixed solution to obtain a mixed solution;

[0028] (2) adding erythritol bis(carbonate) to the mixed solution obtained in step (1), and post-processing to obtain a lithium ion battery electrolyte.

[0029] In one embodiment of the present invention, in step (1), the mixed solution is a solution obtained by mixing any two or three of ethylene carbonate, dimethyl carbonate or ethyl methyl carbonate.

[0030] In an embodiment of the present invention, in the mixed solution, the weight ratio of ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate is 0-5:0-5:0-5.

[0031] In one embodiment of the present invention, in step (1), LiPF 6 And the weight ratio of mixed solution is 1-10:90-99.

[0032] In one embodiment of the present invention, in step (2), the weight ratio of erythri...

Embodiment 1

[0041] This embodiment provides a lithium-ion battery.

[0042] (1) Production of positive electrode active material slurry: dry-mix 16.044 kg of lithium iron phosphate, 0.42 kg of superconducting carbon black conductive agent, and 0.336 kg of binder polyvinylidene fluoride for 30 minutes, and then add solvent N-methyl fluoride. 13.2 kg of pyrrolidone was stirred for 6 h to obtain a positive electrode slurry with a viscosity of about 8000 mPa·s.

[0043] (2) Production of positive electrode sheet: The positive electrode slurry is uniformly coated on the front and back sides of an aluminum foil with a thickness of 8 mm. Coating process control areal density at 24mg / cm 2 At the same time, 20mm of pole ear area is reserved on both sides; the coated pole piece is passed through a 20m-long 110℃ oven at a speed of 3m / s to remove the solvent NMP to obtain a positive pole piece; use a roller press to roll the pole piece , so that its compacted density reaches 2.85g / cm 3 , and then ...

Embodiment 2

[0051] This embodiment provides a lithium-ion battery.

[0052] (1) Production of positive electrode active material slurry: dry-mix 16.044 kg of lithium iron phosphate, 0.42 kg of superconducting carbon black conductive agent, and 0.336 kg of binder polyvinylidene fluoride for 30 minutes, and then add solvent N-methyl fluoride. 13.2 kg of pyrrolidone was stirred for 6 h to obtain a positive electrode slurry with a viscosity of about 8000 mPa·s.

[0053] (2) Production of positive electrode sheet: The positive electrode slurry is uniformly coated on the front and back sides of an aluminum foil with a thickness of 8 mm. Coating process control areal density at 24mg / cm 2 At the same time, 20mm of pole ear area is reserved on both sides; the coated pole piece is passed through a 20m-long 110℃ oven at a speed of 3m / s to remove the solvent NMP to obtain a positive pole piece; use a roller press to roll the pole piece , so that its compacted density reaches 2.85g / cm 3 , and then ...

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Abstract

The invention relates to the technical field of lithium ion battery electrolyte, in particular to lithium ion battery electrolyte, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: dissolving LiPF6 in a solution obtained by mixing any two or three of ethylene carbonate, dimethyl carbonate or methyl ethyl carbonate to obtain a mixed solution; and adding erythritol bis (carbonate) into the mixed solution, and stirring to obtain the lithium ion battery electrolyte. And further preparing the lithium ion battery electrolyte to obtain the lithium ion battery. The lithium ion battery prepared by the invention not only can be charged and discharged at a high rate under a low-temperature condition, but also has relatively high safety and stability and relatively long cycle life, and has relatively high energy density to meet relatively high requirements of mobile equipment, power batteries and energy storage equipment.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrolyte, in particular to a lithium ion battery electrolyte and a preparation method thereof, and a lithium ion battery. Background technique [0002] As the energy storage device with the highest energy conversion efficiency, lithium-ion battery occupies an important position in the new energy industry. In recent decades, with the popularization of portable electronic products and power batteries, the demand for higher battery energy density has increased day by day. Researchers have developed a variety of high-capacity cathode materials, which has promoted the continuous improvement of lithium-ion battery energy density. . However, the change in the negative electrode is small. Graphite has always been the main negative electrode material. Although the silicon negative electrode has a higher capacity, graphite is still required in most cases. The presence of graphite imposes ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0568H01M10/0525H01M4/13
CPCH01M10/0567H01M10/0569H01M10/0568H01M10/0525H01M4/13H01M2004/021Y02E60/10
Inventor 孙唯王宝君黄海宁
Owner BATTERO TECH CORP LTD
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