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High voltage electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries and high-voltage electrolytes, can solve the problems of unstable electrolyte, reduced cycle life and safety of lithium-ion batteries, and achieve the effect of improving stability and safety.

Active Publication Date: 2015-11-25
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrolytes become unstable at elevated voltages and can lead to reduced cycle life and safety in Li-ion batteries

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
Comparison scheme
Effect test

Embodiment 1

[0060] Cyclic Voltammetry Analysis of Electrolytes in Different Solvent Systems

[0061] Measurements are made in a coin cell. A graphite electrode was used as the working electrode, and lithium metal was used as the counter and reference electrode. The separator is placed between the lithium metal electrode and the graphite electrode.

[0062] Using MCMB (MesoCarbon MicroBeads) graphite powder as the active material, polyvinylidene fluoride (PVDF) resin, and conductive carbon black (SuperP) at room temperature at a loading of 80:10:10 wt% to prepare the working electrode belt . The separate electrodes were transferred to a helium-filled and H 2 O and O 2 <1ppm before drying in an oven at 90°C in a glove box.

[0063] Adopt stainless steel CR2032 button battery. The cell consisted of a disc of the working electrode, an electrolyte-saturated glass fiber separator, and a lithium foil. The cells were tested on an Arbin battery tester in potentiodynamic (cyclic voltammetry)...

Embodiment 2

[0069] Potentiodynamic sweep and cycle tests (half cells) of electrolytes with different additives

[0070] Measurements are made in a coin cell. A graphite electrode was used as the working electrode, and lithium metal was used as the counter and reference electrode. The separator is placed between the lithium metal electrode and the graphite electrode.

[0071] Working electrode strips were prepared at room temperature with MCMB (mesophase carbon microspheres) graphite powder as active material, polyvinylidene fluoride (PVDF) resin, and conductive carbon black (SuperP) at a loading of 80:10:10 wt%. The separate electrodes were transferred to a helium-filled and H 2 O and O 2 < 1 ppm in a glove box prior to drying in an oven at 90°C.

[0072] Adopt stainless steel CR2032 button battery. The cell consisted of a disc of the working electrode, an electrolyte-saturated glass fiber separator, and a lithium foil. The cells were tested on an Arbin battery tester in potentiodyn...

Embodiment 3

[0083] LiCoO for lithium-ion batteries with dinitrile and nitrile electrolyte solvents 2 vs. graphite cycle

[0084] Measurements are made in a coin cell. Adopt stainless steel CR2032 button battery. It is assembled with two disks of positive and negative electrodes and an electrolyte-saturated glass fiber separator. At room temperature with LiCoO 2 The powder is the active material, polyvinylidene fluoride (PVDF) resin, and conductive carbon black (SuperP) at a loading of 80:10:10wt% to make LiCoO 2 cathode. Graphite anodes were fabricated at room temperature with MCMB (mesophase carbon microspheres) as the active material, polyvinylidene fluoride (PVDF) resin, and conductive carbon black (SuperP) at a loading of 80:10:10 wt%. The individual electrodes are transferred to a helium-filled and H 2 O and O 2 <1ppm before drying in the glove box.

[0085] In the actual battery performance test, different additive compounds are used to prepare full button batteries, with ad...

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Abstract

The present application discloses a high voltage electrolyte including an electrolyte solvent which includes a mixture of a dinitrile solvent and a nitrile solvent and is stable at voltage of about 5 V or above. The dinitrile solvent may include at least one selected from the group consisting of malononitrile, succinonitrile, glutaronitrile, adiponitrile, pimelonitrile, suberonitrile, azelanitrile and sebaconitrile. The nitrile solvent may include at least one selected from the group consisting of acetonitrile, propionitrile, butyronitrile, pivalonitrile and capronitrile. The mixture is especially mentioned as a mixture of adiponitrile with butyronitrile ADN:BN in a volume ratio of 75:25. The present application also discloses a lithium ion battery including the above high voltage electrolyte. The lithium ion battery exhibits a cyclic performance of greater than about 300 cycles and with a capacity retention of greater than about 80%.

Description

technical field [0001] The present application relates to high voltage electrolytes and lithium ion batteries comprising the high voltage electrolytes. Background technique [0002] The ever-increasing demand for energy in modern society is driving the industry to develop more efficient means of storing electricity, which means battery systems with high energy, high power density, long service life, and low production / waste disposal costs. In the past decade, many different battery systems such as nickel-metal hydride, sodium-sulfur, and lithium-ion systems have been found to have high development potential for electric vehicles. Among them, lithium-ion batteries are considered to be the most promising candidates in this demanding application. [0003] Conventional lithium-ion batteries utilizing carbonate electrolytes provide an operating voltage of about 3.2-3.8V and a stable charging voltage up to about 4.3V. Electrolytes become unstable at elevated voltages and can lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/0525
CPCH01M10/0569H01M10/0525H01M10/0567H01M2300/0037Y02E60/10
Inventor 何锦镖何国强王然石徐业明陆伟俊许美美
Owner NANO & ADVANCED MATERIALS INST