Electrolyte for over 4.2V high-voltage system battery

An electrolyte and high voltage technology, applied in electrolytes, secondary batteries, organic electrolytes, etc., can solve problems such as unsatisfactory battery rate performance, low conductivity, and high viscosity

Inactive Publication Date: 2017-02-22
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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Problems solved by technology

However, the viscosity of sulfone solvents is relatively high, and the electrolyte obtained after mixing with organic carbonate solvents has relatively low conductivity, which cannot meet the rate performance of the battery. Moreover, it is difficult for sulfone solvents to form a film on the negative electrode, resulting in poor cycle performance of the battery.

Method used

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  • Electrolyte for over 4.2V high-voltage system battery
  • Electrolyte for over 4.2V high-voltage system battery
  • Electrolyte for over 4.2V high-voltage system battery

Examples

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the examples, and the implementation of the present invention includes but not limited to the following examples of implementation. Some substances in the examples are represented by the abbreviations in brackets after the substance in the summary of the invention.

[0018] The preparation of the electrolyte is carried out in a dry room at 20°C and a dew point of -50°C. The preparation process is as follows: First, mix the solvents (non-aqueous organic solvents, sulfone solvents and fluoroether solvents) in proportion, and after fully stirring, add lithium salt according to the designed formula ratio, and after fully stirring and mixing, add film-forming Additives, stir and mix again to obtain the required electrolyte. The proportioning of concrete comparative example and embodiment is shown in Table 1:

[0019] Table 1 The formula table of the electrolyte comparison sample and the implementatio...

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Abstract

The invention discloses an electrolyte for an over 4.2V high-voltage system battery. The electrolyte comprises a non-aqueous organic solvent, a lithium salt and a sulfone solvent, wherein the electrolyte is characterized in that an electrolyte system also comprises a fluoroether solvent and a film-forming additive. An oxidative decomposition-resistant window of the electrolyte system can be obviously improved by addition of the sulfone solvent; and the electrolyte can meet use of the over 4.2V high-voltage system battery. However, the viscosity of the electrolyte system is improved by addition of the sulfone solvent, so that the conductivity of the system is reduced. Meanwhile, the performance of the battery is reduced due to the fact that the sulfone solvent cannot easily form a film on a negative electrode, so that the same a fluoroether solvent capable of resisting high-voltage decomposition is introduced into the electrolyte system to reduce the viscosity of the system; the conductivity is ensured within a reasonable range; and the film-forming additive is added, and excellent cycle performance of the high-voltage system battery is ensured.

Description

technical field [0001] The invention belongs to the technical field of electrolytes for lithium-ion secondary batteries, in particular to an electrolyte for batteries with a high-voltage system above 4.2V. Background technique [0002] With the global energy shortage and the continuous deterioration of environmental conditions, replacing traditional vehicles with high energy consumption and serious pollution with clean energy electric vehicles has become the main development direction of the future vehicle industry. Compared with lead-acid batteries, lithium-ion batteries have many unique advantages and will be widely used in battery electric vehicles (BEV), hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV). However, currently used lithium-ion battery cathode materials such as LiCoO 2 , LiMn 2 o 4 And the voltage of the new nickel-cobalt-manganese ternary material is about 4V, and the power density is low. If it is used in electric vehicles, multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569
CPCH01M10/0567H01M10/0569H01M2300/0025H01M2300/0034H01M2300/0037Y02E60/10
Inventor 杨道均唐宏武栗晓杰吴可吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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