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Anti-overcharge low-temperature electrolyte and lithium ion battery based on same

An anti-overcharge and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of inability to discharge, overcharge and discharge, low discharge capacity, etc., and achieve the effect of reducing impedance, low viscosity, and high ionic conductivity

Pending Publication Date: 2021-07-20
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of anti-overcharge low-temperature electrolyte and lithium-ion battery based on it, solve the problem that the discharge capacity of the existing lithium-ion battery is low or even unable to discharge at low temperature and due to Safety problems caused by overcharge and discharge, the lithium-ion battery based on the anti-overcharge low-temperature electrolyte has excellent anti-overcharge performance, and has excellent ultra-low temperature discharge performance

Method used

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  • Anti-overcharge low-temperature electrolyte and lithium ion battery based on same
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  • Anti-overcharge low-temperature electrolyte and lithium ion battery based on same

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preparation example Construction

[0038] The present invention also provides a method for preparing the above-mentioned electrolyte, the method comprising: mixing an organic solvent, a lithium salt, and the above-mentioned additives to prepare the electrolyte, and the mixing is not limited by the order of addition.

[0039]The present invention also provides a lithium ion battery, which includes the above-mentioned electrolyte solution. The lithium ion battery includes a positive electrode sheet, a separator and a negative electrode sheet, and the separator is arranged between the positive electrode sheet and the negative electrode sheet.

[0040] Specifically, in a specific embodiment of the present invention, the positive electrode sheet includes one or two positive electrode active material layers and a positive electrode current collector. Wherein the positive electrode active material layer includes a positive electrode active material, a conductive agent and a positive electrode binder, the positive elec...

Embodiment 1

[0045] Mix the solvent ethyl acetate, ethylene carbonate, propylene carbonate, diethyl carbonate, and vinyl methyl carbonate, and add vinylene carbonate, 1,3-propane sultone, vinyl sulfite, 1,4-di-tert-butyl-2,5-dimethoxybenzene was used as an additive, and finally lithium hexafluorophosphate and lithium tetrafluoroborate were added to obtain the anti-overcharge low-temperature electrolyte of Example 1.

[0046] In the obtained anti-overcharge low-temperature electrolyte, according to mass percentage, the above-mentioned components are respectively: 36wt% of ethyl acetate, 12wt% of ethylene carbonate, 13wt% of propylene carbonate, 15wt% of diethyl carbonate, methylethylene carbonate 2wt% ester as organic solvent (78wt%), lithium hexafluorophosphate 14wt% and lithium tetrafluoroborate 3wt% as lithium salt (17wt%), vinylene carbonate 1.5wt%, 1,3-propane sultone 1.2wt% and vinyl sulfite 0.3wt% as a low-resistance film-forming additive (3wt%), and 2wt% of 1,4-di-tert-butyl-2,5 dim...

Embodiment 2

[0049] Mix the solvent ethyl acetate, ethylene carbonate, propylene carbonate, diethyl carbonate, and vinyl methyl carbonate, and add vinylene carbonate, 1,3-propane sultone, vinyl sulfite, 1,4-di-tert-butyl-2,5-dimethoxybenzene was used as an additive, and finally lithium hexafluorophosphate and lithium tetrafluoroborate were added to obtain the anti-overcharge low-temperature electrolyte of Example 1.

[0050] In the obtained anti-overcharge low-temperature electrolyte, according to mass percentage, the above-mentioned components are respectively: 36wt% of ethyl acetate, 12wt% of ethylene carbonate, 13wt% of propylene carbonate, 15wt% of diethyl carbonate, methylethylene carbonate 2wt% of ester as organic solvent (78wt%), 14wt% of lithium hexafluorophosphate and 3wt% of lithium tetrafluoroborate as lithium salt (17wt%), 2wt% of vinylene carbonate, 1.7wt% of 1,3-propane sultone and Vinyl sulfite 0.3wt% is used as a low-resistance film-forming additive (3wt%), and 1,4-di-tert-...

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Abstract

The invention discloses an anti-overcharge low-temperature electrolyte and a lithium ion battery based on the same, and belongs to the technical field of lithium ion batteries. The anti-overcharge low-temperature electrolyte comprises an organic solvent, a lithium salt, a low-impedance film-forming additive and an anti-overcharge additive, wherein the organic solvent comprises a carbonic ester solvent and a linear carboxylic ester solvent; the lithium salt comprises one or more of lithium hexafluorophosphate, lithium difluorophosphate, lithium tetrafluoroborate and lithium difluoro (oxalato) borate; the low-impedance film-forming additive is at least two of vinylene carbonate, 1, 3-propane sultone and ethylene sulfite; the anti-overcharge additive is 1, 4-di-tert-butyl-2, 5-dimethoxybenzene, wherein the content of the organic solvent is 78 wt%-82 wt%, the content of the lithium salt is 15 wt%-18 wt%, the content of the anti-overcharge additive is 1 wt%-2 wt%, and the balance is the low-impedance film-forming additive. The lithium ion battery solves the safety problem caused by low discharge capacity and even incapability of discharging of the existing lithium ion battery at low temperature and over-charge and over-discharge.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an anti-overcharge low-temperature electrolyte and a lithium ion battery based thereon. Background technique [0002] With the advancement of energy technology, lithium-ion batteries are more and more widely used in the fields of digital, power, energy storage and military aerospace. The expansion of application scenarios requires lithium-ion batteries to have the characteristics of both high and low temperature performance, especially the special requirements under extreme low temperature conditions. At the same time, since the current lithium-ion batteries mostly use flammable carbonate and carboxylate organic electrolytes, it is very likely to cause combustion or even explosion under extreme working conditions, such as overcharge, overdischarge and overheating, resulting in A big security risk. Therefore, the development of an electrolyte with high safety and low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0568H01M10/0525
CPCH01M10/0567H01M10/0569H01M10/0568H01M10/0525H01M2300/0025H01M2300/0037Y02E60/10
Inventor 胡朝文邵乐薛其才米吉福张丁田占元
Owner SHAANXI COAL & CHEM TECH INST
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