High-voltage electrolyte and lithium ion battery

An electrolyte and high-voltage technology, applied in the field of electrochemistry, can solve the problems of the lithium-ion battery's room temperature cycle performance and safety performance to be improved, and achieve the effects of improving the room temperature cycle performance, suppressing the generation of gas, and improving the safety performance.

Inactive Publication Date: 2017-06-09
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the lithium-ion battery in the above-mentioned literature uses a voltage of 4.85V and above, the normal temperature cycle and safety performance of the lithium-ion battery still need to be improved.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The non-aqueous solvent is ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, and propylene carbonate (the mass ratio of the four is 30:16:35:5); the lithium salt is lithium hexafluorophosphate and lithium difluorooxalate borate, and the The mass concentrations of the lithium salts are 12% and 0.5% respectively; the film-forming additive is 1,3-propane sultone, which accounts for 1% by mass of the total mass of the electrolyte; the overcharge additive cyclohexylbenzene accounts for 1% of the electrolyte. The mass percentage of the total mass is 0.5%.

Embodiment 2

[0040]The non-aqueous solvent is ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, and propylene carbonate (the mass ratio of the four is 30:15:35:5); the lithium salt is lithium hexafluorophosphate and lithium difluorooxalate borate, and the The concentrations of the lithium salts are 12% and 0.5% respectively; the film-forming additive is 1,3-propane sultone, which accounts for 1% by mass of the total mass of the electrolyte; the overcharge additive cyclohexylbenzene accounts for 1% of the total electrolyte. The mass percentage of mass is 0.5%; high pressure resistant additive The mass percentage of the total mass of the electrolyte is 1%.

Embodiment 3

[0042] The non-aqueous solvent is ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, and propylene carbonate (the mass ratio of the four is 30:15:35:5); the lithium salt is lithium hexafluorophosphate and lithium difluorooxalate borate, and the The concentrations of the lithium salts are 12% and 0.5% respectively; the film-forming additive is 1,3-propane sultone, which accounts for 1% by mass of the total mass of the electrolyte; the overcharge additive cyclohexylbenzene accounts for 1% of the total electrolyte. The mass percentage of mass is 0.5%; high pressure resistant additive The mass percentage of the total mass of the electrolyte is 1%.

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Abstract

The invention relates to high-voltage electrolyte and a lithium ion battery. The high-voltage electrolyte comprises a non-water solvent, a lithium slat and an additive, wherein the additive comprises a high-voltage-resistant additive; the high-voltage-resistant additive comprises one or more of five-membered heterocyclic compounds and / or one or several materials from six-membered heterocyclic compounds; the general structural formula of the five-membered heterocyclic compounds is shown as the accompanying drawing; the general structural formula of the six-membered heterocyclic compounds is shown as the accompanying drawing. Through the improvement on the additive, the normal temperature circulation performance of the lithium ion battery prepared from the electrolyte at 4.85V or higher is greatly improved; in addition, the gas generation during the continuous charging and discharging can be inhibited by the electrolyte, so that the safety performance of the lithium ion battery using the electrolyte is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a high-voltage electrolyte and a lithium ion battery. Background technique [0002] Currently, the size and weight of mobile information terminals such as mobile phones and notebook computers are rapidly increasing, and as a driving power source for such mobile information terminals, higher capacity batteries are required. In order to meet such demands, lithium-ion batteries that charge and discharge lithium ions by moving lithium ions between the positive and negative electrodes using a non-aqueous electrolyte are widely used as new secondary batteries with high output and high energy density. [0003] As improving the capacity of lithium-ion battery, currently feasible method has following several kinds: (1) improve the capacity of active material; (2) increase charging voltage; In the case of increasing the charging voltage, there is a problem that the el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 陈黎王峰秦虎甘朝伦王婷婷陈晓琴袁杰陈俊彩
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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