High-voltage electrolyte for lithium-ion battery and application thereof

A power battery and high-voltage technology, which is applied in the field of chemical power sources, can solve the problems of battery internal resistance increase and battery cycle performance decline, and achieve the effects of reducing thickness expansion rate, preventing metal ion dissolution, and simple preparation process

Inactive Publication Date: 2018-02-23
SHANDONG HONGZHENG BATTERY MATERIAL TECH
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  • Claims
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Problems solved by technology

At present, the electrolyte of commercial lithium-ion batteries, once the charging cut-off voltage exceeds 4.3V, the conventional carbonate-based electrolyte will

Method used

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  • High-voltage electrolyte for lithium-ion battery and application thereof

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Embodiment 1

[0026] 1. Electrode Preparation

[0027] The binder polyvinylidene fluoride (PVDF) is uniformly dispersed in N-methylpyrrolidone (NMP) solution, and configured as a 10% (mass fraction) solution. According to the active material m(LiCoO 2 ):m(SP):m(PVDF)=8:1:1 Accurately weigh the active substance and SP, grind for 30 minutes, pour into the weighed PVDF solution, and add a certain amount of NMP to adjust the viscosity. After the slurry is prepared, it is evenly coated on an aluminum foil, dried in vacuum at 80°C for 10 h, pressed at 10 MPa, and weighed for future use.

[0028] 2. Battery assembly

[0029] The metal lithium sheet is used as the counter electrode, the diaphragm is Celgard2400, and the electrolyte lithium salt is 1.0-1.2mol / L LiPF 6 , the non-aqueous organic solvent was EC:EMC:DMC (1:1:1v / v), the electrolyte additives were 0.5-1%PST and 0.5-1%LiDFP, and the CR2016 battery was assembled in a Braun glove box in Germany.

[0030] The electrolyte lithium salt is 1...

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Abstract

The invention discloses a high-voltage electrolyte for a lithium-ion battery and an application thereof. The high-voltage electrolyte comprises a nonorganic solvent, an electrolyte lithium salt and anelectrolyte additive, wherein the electrolyte additive comprises 0.3-2.0% of PST and 0.3-2.0% of LiDFP on the basis of the total weight of the high-voltage electrolyte. According to the invention, through the optimal combination of PST and LiDFP in the electrolyte additive, the excellent cycle performance acquired by the high voltage battery is guaranteed, and meanwhile, the high-temperature storage property of the high voltage battery is effectively improved, the capacity retention ratio of the battery after high-temperature storage is increased and the thickness swelling rate thereof is reduced. The charging cut-off voltage of the lithium-ion battery using the high-voltage electrolyte disclosed by the invention is more than 4.2V but less than or equal to 4.4V, the high-voltage electrolyte is capable of protecting the anode and preventing the metal ions from dissolving out and the high-voltage electrolyte also can form a stable SEI film on a cathode so that the excellent cycle performance and high-temperature storage property of the high-voltage electrolyte can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a high-voltage electrolyte for lithium-ion power batteries and its application. Background technique [0002] In the 21st century, energy storage is one of many challenges, and the rapid development of various mobile energy-consuming devices makes it more important than ever before. Therefore, there is an urgent need to develop a high-performance, low-cost and environmentally friendly energy storage device to meet people's needs. Lithium-ion batteries have high energy density and service life, and have great application prospects in many fields such as new energy vehicles, wind energy, and solar energy. [0003] With the increase of electric vehicles, hybrid vehicles, electric tools and military applications, people put forward higher requirements for the energy density of lithium-ion batteries. The energy of lithium-ion batteries is determined by the battery cap...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 洪树张少杰龚勇君
Owner SHANDONG HONGZHENG BATTERY MATERIAL TECH
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