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High-temperature lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied to battery electrodes, secondary batteries, battery pack components, etc., can solve problems affecting battery electrical performance, achieve high capacity retention and capacity recovery, and is easy to manufacture and reliable. highly operable effect

Active Publication Date: 2011-06-01
XIAN SAFTY ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some researchers in the industry can solve the problem of battery inflation to a certain extent by adding a certain amount of special additives, but it seriously affects the electrical performance of the battery at room temperature and high temperature.

Method used

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  • High-temperature lithium ion battery electrolyte and lithium ion battery
  • High-temperature lithium ion battery electrolyte and lithium ion battery
  • High-temperature lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this embodiment, when preparing the electrolyte: first in a glove box full of argon (H 2 O content6 ), uniformly mixed to be prepared as a mixed lithium salt solution with a concentration of 1mol / L. At the same time, in the mixed lithium salt solution, first add lithium bisoxalate borate LiBOB as a high-temperature film-forming additive and the mass percentage between the added lithium bisoxalate borate LiBOB and the mixed lithium salt solution is 1 %, in the actual preparation process, the mass percentage between lithium bisoxalate borate LiBOB and the mixed lithium salt solution can be adjusted accordingly in the range of 0.2% to 3% according to actual needs; then add ionic liquid EMI-TFSI as Inhibit high-temperature gas production additives, and the mass percentage between the added ionic liquid EMI-TFSI and the mixed lithium salt solution is 3%. In the actual preparation process, the high-temperature gas production inhibitors can be combined with the The mass pe...

Embodiment 2

[0042] In the present embodiment, the difference from Example 1 is: when preparing the electrolyte: in a glove box full of argon (H 2 O content6 ), uniformly mixed and prepared into a mixed lithium salt solution with a concentration of 1.1 mol / L. At the same time, in the mixed lithium salt solution, first add lithium bisoxalate borate LiBOB as a high-temperature film-forming additive and the mass percentage between the added lithium bisoxalate borate LiBOB and the mixed lithium salt solution is 0.5 %; then add ionic liquid BMI-TFSI as an additive to suppress high-temperature gas production, and the mass percentage between the added ionic liquid BMI-TFSI and the mixed lithium salt solution is 5%. To be electrolyte salt (ie lithium hexafluorophosphate LiPF 6 ) after fully dissolving, let it stand for 24 hours to obtain high-temperature lithium-ion battery electrolyte.

[0043] In this embodiment, the manufacturing method steps and required materials for manufacturing a lithium...

Embodiment 3

[0045] In this embodiment, the difference from Example 1 is: when preparing the electrolyte: first in a glove box full of argon (H 2 O content6 ), uniformly mixed and prepared into a mixed lithium salt solution with a concentration of 0.8mol / L. At the same time, in the mixed lithium salt solution, first add lithium bisoxalate borate LiBOB as a high-temperature film-forming additive and the mass percentage between the added lithium bisoxalate borate LiBOB and the mixed lithium salt solution is 2 %; Add the mixed additive mixed with ionic liquid PMI-TFSI and phthalic anhydride as the high-temperature gas production additive, and the mass percentage between the added ionic liquid PMI-TFSI and the mixed lithium salt solution is 5%, the mass percentage between the added phthalic anhydride and the mixed lithium salt solution is 4%. To be electrolyte salt (ie lithium hexafluorophosphate LiPF 6 ) after fully dissolving, let it stand for 24 hours to obtain high-temperature lithium-io...

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Abstract

The invention discloses a high-temperature lithium ion battery electrolyte and a lithium ion battery. The electrolyte is prepared by uniformly mixing electrolyte salts, a nonaqueous organic solvent, a high-temperature film-forming additive and high-temperature gas generation inhibiting additives, wherein the high-temperature film-forming additive is lithium bis(oxalate) borate (LiBOB); the LiBOB accounts for 0.2-3% by mass of the mixed lithium salt solution formed by the electrolyte salts and the nonaqueous organic solvent; the high-temperature gas generation inhibiting additive is one or twoof ionic liquid and phthalic anhydride, and accounts for 0.8-9% by mass of the mixed lithium salt solution; and the total content of the added high-temperature film-forming additive and high-temperature gas generation inhibiting additives accounts for 1-11% by mass of the mixed lithium salt solution. The lithium ion battery comprises a cathode, an anode, a diaphragm and the high-temperature lithium ion battery electrolyte. The invention has the advantage of reasonable design, the steps in the preparation processes are simple and convenient to implement, and the prepared electrolyte and the lithium ion battery have excellent comprehensive performance.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte and a lithium-ion battery using the electrolyte, in particular to a high-temperature lithium-ion battery electrolyte and a lithium-ion battery. Background technique [0002] In recent years, due to the pressure of environmental pollution and energy shortage, all countries are forced to look for new green, environmentally friendly and sustainable energy sources. The high-energy and environmentally friendly lithium-ion battery that appeared in the 1990s has become one of the most attention-grabbing power sources due to its advantages such as high energy density, long cycle life, and high operating voltage. However, as people's understanding of battery usage conditions continues to deepen, it is found that in many cases the battery is used under the condition of higher than normal temperature. For example, when a notebook computer is running, the temperature of the battery will rise to about 45°C ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M4/131H01M4/133H01M2/18H01M2/16H01M10/0525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 谭晓兰杨洪李峰何显峰
Owner XIAN SAFTY ENERGY TECH
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