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Electrochemical cell based on lithium technology with internal reference electrode, process for its production and methods for simultaneous monitoring of the voltage or impedance of the anode and the cathode thereof

A reference electrode, electrochemical technology, used in secondary battery manufacturing, lithium storage batteries, electrochemical generators, etc.

Inactive Publication Date: 2013-08-14
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, there is no foreseeable way to physically incorporate such a double-salt bridge electrode into a Li-polymer battery
However, in the absence of a reliable method to determine the independent voltages on the anode and cathode, some trade-offs must be made between safety and capacity yield

Method used

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  • Electrochemical cell based on lithium technology with internal reference electrode, process for its production and methods for simultaneous monitoring of the voltage or impedance of the anode and the cathode thereof
  • Electrochemical cell based on lithium technology with internal reference electrode, process for its production and methods for simultaneous monitoring of the voltage or impedance of the anode and the cathode thereof
  • Electrochemical cell based on lithium technology with internal reference electrode, process for its production and methods for simultaneous monitoring of the voltage or impedance of the anode and the cathode thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0186] Example 1: Preparation of electrodes

[0187] Positive electrode: Lithium cobalt oxide containing cathode material (LiCoO 2 ) of the positive electrode. The casting paste is made of LiCoO 2 , graphite, carbon black, and PVDF (Kynar LBG2) as a binder are composed of homogeneous mixtures formed in acetone at a rate of 90%, 2.5%, 2.5%, and 5%, respectively. Casting of the slurry was done using a doctor blade on a plastic film resting on a flat glass substrate. After evaporation of the solvent, the specific capacity of the cathode was determined to be 3.15 mAh / cm 2 And has a thickness of 208 μm. The electrode material was laminated onto an aluminum current collector having a thickness of 120 μm.

[0188] Negative electrode: The negative electrode containing the anode material graphite is prepared by a casting process. The casting slurries consisted of homogeneous mixtures of graphite, carbon black and PVDF (Kynar LBG2) as a binder in acetone at ratios of 85%, 5% and 1...

example 2

[0190] Example 2: Characterization of electrode materials

[0191] Linear sweep voltammetry (LSV) or cyclic voltammetry (CV) was performed on the three types of electrodes prepared according to Example 1. All experiments were carried out in electrochemical cells with lithium metal foil serving as reference and counter electrode. The electrolyte used is composed of 1:1 ethylene carbonate (EC) and contains 1M LiPF 6 A battery-grade mixture of dimethyl carbonate (DEC). The electrode area of ​​the working electrode (that is, the cut circle of the electrode foil in Example 1) is 1.3cm 2 . All experiments were performed under an argon atmosphere. Use slow scan rates to better resolve voltammetric peaks. Specifically, for graphite and Li 4 Ti 5 o 12 Both use 10μV / s, for LiCoO 2 Use 100 μV / s to obtain the voltammogram of the electrode ( Figure 7-9 ).

[0192] In LiCoO 2 In the case of , 3 cycles were performed to verify the evolution of the voltammetric peak with the help...

example 3

[0196] Example 3: Full cell design 1 and its construction

[0197] Using the electrode materials prepared as described in Example 1 and containing Li at a ratio of 75% and 25%, respectively 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 and PVDF spacers to construct full cells. The thickness of the spacer was 55 μm. Figure 10 A battery construction scheme of an embodiment of the present invention is shown.

[0198] The cathode material was laminated onto an aluminum current collector having a thickness of 120 μm. The anode was laminated onto a copper current collector with a thickness of 120 μm. Both the cathode and anode have external dimensions of 58 x 33 mm with an 8 x 5 mm notch cut from the center of one side inwards of the electrode. The separator has slightly larger dimensions compared to the anode and cathode. The reference electrode material was laminated onto a copper current collector with a thickness of 120 μm. Reference electrodes for batteries are obtained by cutting strip...

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Abstract

The present invention is directed to an electrochemical cell based on lithium technology, comprising the following components: a positive electrode containing a cathode material, a separator made of an electrically insulating material, a negative electrode containing an anode material, the electrodes and the separator having layer or sheet form, a liquid and / or solid ion conductor material for transportation of lithium ions between the positive and the negative electrode, the said components being sealed within a casing, wherein the positive and the negative electrode each comprise an electrically conducting structure extending through a wall of the casing for further electrical connection, characterized in that it further comprises: a reference electrode within the said casing which is electrically insulated from the positive and the negative electrode, the reference electrode having layer or sheet form comprising at least one non-metallic lithium compound, and an electrically conducting structure in layer or sheet form being in electrical contact with the said reference electrode, the electrically conducting structure extending through a wall of the casing for further electrical connection. The invention is further directed to a method for the preparation of this electrochemical cell, to a method for measuring the voltage or the impedance of a cathode and / or of an anode of such an electrochemical cell based on lithium technology, and to driving methods of said cell, decreasing aging phenomena and improving its life duration.

Description

technical field [0001] The present invention relates to a lithium battery comprising layered components having an internal reference electrode incorporated therein to ease simultaneous monitoring of the voltage and / or impedance of the anode and cathode and to provide the highest capacity and enhanced Possibility of using batteries for safety. Background technique [0002] A reference electrode is defined as an electrode with a stable electrochemical potential that serves as a reference point for measuring the potential of one or more electrodes in an electrochemical cell. [0003] In the past, reference electrodes were mainly used externally. Table 1 below summarizes the key properties of the most important reference electrodes in the state of the art and their compatibility with Li-ion / polymer batteries: [0004] [0005] Among the items listed above, Ag / AgCl reference electrodes, NHE reference electrodes and SCE reference electrodes are generally used in electrochemic...

Claims

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Application Information

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IPC IPC(8): H01M10/48H01M4/00H01M10/052H01M10/0585H01M4/13H01M6/50
CPCY02E60/122H01M10/04H01M10/0585H01M10/052H01M4/00G01R31/3606H01M4/13H01M6/5005H01M10/48Y10T29/49115Y02E60/10Y02P70/50G01R31/3835G01R31/389H01M4/661H01M50/46G01R31/382
Inventor C·维贾亚瓦德纳G·纽曼恩P·古尔德
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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