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Lithium ion battery electrolyte for silicon-carbon negative electrode and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as battery flatulence, affect battery life and safety performance, and achieve the effects of improving cycle life, inhibiting decomposition and gas production, and inhibiting high-temperature storage performance

Active Publication Date: 2021-03-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps create an effective protective layer on both sides of a positive plate for use in batteries that has better thermal properties than traditional methods like polypropylene (PP) or vinyltetone but also prevents gases from being released when they are produced due to changes made by changing their size caused by swelling/expanded materials inside them. These improvements make it possible to achieve longer cycles without losing power overhelds compared to older designs.

Problems solved by technology

This patents discusses different methods for developing suitable elec trodes with improved characteristics including higher capacities, lower voltages, longer lifetimes, better cycling ability compared to existing ones. Silicone based composites were proposed because they provide good mechanical strength while maintaining their excellent conductivity at room temperatures. Additionally, adding these components helps prevent crackings from occurring over time without compromising cell's overall function or reducing storage capabilities.

Method used

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  • Lithium ion battery electrolyte for silicon-carbon negative electrode and lithium ion battery
  • Lithium ion battery electrolyte for silicon-carbon negative electrode and lithium ion battery
  • Lithium ion battery electrolyte for silicon-carbon negative electrode and lithium ion battery

Examples

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Embodiment 1

[0050] A lithium-ion battery electrolyte solution for a silicon-carbon negative electrode, the raw materials of which include by weight percentage: 13.5% of lithium hexafluorophosphate, 0.5% of N-succinimide-based compounds, 0.5% of triphenyl phosphite, 8% of fluoroethylene carbonate, Vinyl sulfate 1%, lithium difluorophosphate 1%, and organic solvent as the balance; wherein, the N-succinimide-based compound and organic solvent used are the same as those in Comparative Example 2.

[0051] The preparation method of the above-mentioned electrolyte is as follows: in a glove box (moisture <10ppm, oxygen content <1ppm) filled with argon, take an organic solvent and mix well, then add fluoroethylene carbonate, vinyl sulfate, triphenyl phosphite , N-succinimide-based compound, lithium difluorophosphate, and then slowly add lithium hexafluorophosphate, and stir until it is completely dissolved.

Embodiment 2

[0053]A lithium-ion battery electrolyte solution for a silicon-carbon negative electrode, the raw materials of which include by weight percentage: 13.5% of lithium hexafluorophosphate, 0.5% of N-succinimide-based compounds, 0.5% of triphenyl phosphite, 8% of fluoroethylene carbonate, 1% of vinyl sulfate, 1% of lithium difluorophosphate, and the balance is organic solvent; wherein, the N-succinimide-based compound and organic solvent used are the same as those in Comparative Example 3.

[0054] The preparation method of electrolyte is the same as that in Example 1.

Embodiment 3

[0056] A lithium-ion battery electrolyte solution for a silicon-carbon negative electrode, the raw materials of which include by weight percentage: 13.5% of lithium hexafluorophosphate, 0.5% of N-succinimide-based compounds, 0.5% of triphenyl phosphite, 8% of fluoroethylene carbonate, 1% of vinyl sulfate, 1% of lithium difluorophosphate, and the balance is organic solvent; wherein, the N-succinimide-based compound and organic solvent used are the same as those in Comparative Example 4.

[0057] The preparation method of electrolyte is the same as that in Example 1.

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Abstract

The invention discloses a lithium ion battery electrolyte for a silicon-carbon negative electrode and a lithium ion battery. The electrolyte comprises a lithium salt, a film-forming additive, a non-aqueous organic solvent and a high-temperature-resistant additive, and the high-temperature-resistant additive comprises triphenyl phosphite and an N-succinimido compound. The electrolyte disclosed by the invention can ensure good cycling stability and high-temperature storage performance of the silicon-carbon negative electrode material lithium ion battery and inhibit gas production.

Description

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Claims

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Application Information

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Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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