Battery Electrode Material Formulation and Manufacturing Process
a technology of material formulation and battery electrode, which is applied in the direction of dc source parallel operation, non-conductive materials with dispersed conductive materials, and electrolyte manufacturing processes, etc., can solve the problems of internal leakage of flowing electrolyte batteries, separator failure, and dendrite formation and branching of battery cells that are less than the density of the battery cells
Inactive Publication Date: 2014-06-12
LOTTE CHEM CORP
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Benefits of technology
The invention provides a chemical composition for battery electrodes that reduces warping and degradation in the presence of bromine. By minimizing the amount of carbon black and adding graphite, the swelling of the battery electrode may be reduced, leading to improved efficiency and longer life span of batteries. The material formulation also reduces nucleation and dendrite formation, preventing failure of the separator and internal leakage of the battery.
Problems solved by technology
Yet, according to another aspect of the present disclosure, by employing the disclosed material formulation, nucleation of battery electrodes may be reduced, thus diminishing dendrite formation and branching between battery cells, which may translate into separator failure and internal leakage within the flowing electrolyte battery.
Method used
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[0069]Example #1 is an embodiment of battery electrode 120 where battery electrode 120 may exhibit the following properties: a melt flow index of fess than 1 gm / 10 min at 230° C. 5 Kg, a bulk resistivity of 0.8 Ω·cm, a surface resistivity of 3.5 Ω·cm2, a tensile strength of 4800 psi, a tensile modulus of 660000 psi, a tensile elongation of 2.5%, a flexural strength of 9000 psi, a tensile strength reduction due to bromine exposure of less than 5%, tensile modulus reduction due to bromine exposure of less than 10%, a flexural modulus of 600000 psi, and a bromine expansion of 0.5%. In order to obtain these properties, battery electrode 120 may be manufactured using formulation components 102 containing 53% wt low MFI polypropylene, 10% wt high MFI polypropylene, 5% wt glass fiber, 5% wt carbon fiber, 10% wt graphite, 12% wt carbon black and 5% wt polyolefin elastomer.
[0070]Example #2 is an embodiment of battery electrode 120 where battery electrode 120 may exhibit the following propert...
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Abstract
An improved chemical composition and manufacturing process for a battery electrode are disclosed. This battery electrode may be later arranged in flowing electrolyte battery cells. Battery electrode material formulation may include a mixture of polypropylene, carbon black, graphite, bonding additives and other substances in different concentrations. The inclusion of graphite may reduce the amount of carbon black in the mixture, thereby reducing the swelling of the battery electrode in the presence of bromine. Moreover, material formulation may reduce warpage caused by the swelling of electrode material, and may additionally improve the performance and properties of flowing electrolyte batteries. An extrusion molding process may be employed in order to fabricate the disclosed battery electrode.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority as a continuation-in-part of U.S. Non-Provisional Patent Application Serial No. 13 / 591,802, filed on Aug. 22, 2012, which in turn claims priority from U.S. Provisional Patent Application Serial No. 61 / 526,145, filed on Aug. 22, 2011, the entirety of which are each expressly incorporated by reference herein.BACKGROUND[0002]1. Field[0003]This invention relates generally to flowing electrolyte battery systems, and more particularly, to material formulations for battery electrodes employed in flowing electrolyte batteries.[0004]2. Background Information[0005]The performance of electrochemical storage devices involves complex, interrelated physical and chemical processes between electrode materials and electrolytes.[0006]Flowing electrolyte batteries may include a stack of flow frame assemblies where electrodes and separators are bonded to the flow frames. There are flow channels in the frames designed to direc...
Claims
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IPC IPC(8): H01M4/66H01M4/04
CPCH01M4/0471H01M4/668H02J1/10H02J7/34H01M8/188H01M4/8875H01M4/96H01M10/365H01M10/46H01M8/0213H01M8/0221H01M8/0226H01M12/085Y02E60/10Y02E60/50B29C45/0001B29C45/14065B29C45/1671B29D99/0096B29K2023/08B29C2045/14868B29K2223/12H01M50/1537H02J7/00
Inventor LEX, PETERCOAD, NATHAN
Owner LOTTE CHEM CORP