off topic - Star Size Comparison HD

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New high-power Si–graphene composite electrode for Li-ion batteries

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New high-power Si–graphene composite electrode for Li-ion batteries : Northwestern Univ. researchers report on a new high-power Si–graphene composite anode material for Li-ion batteries in the journal Advanced Energy Materials . With current technology, the capabilities of a lithium-ion battery are limited in two ways: energy capacity is limited by the charge density, and charge rate is limited by the speed at which the lithium ions can make their way from the electrolyte into the anode. The Northwestern research team combined two techniques to combat both these problems. First, to stabilize the silicon in order to maintain maximize charge capacity, they sandwiched clusters of silicon between the graphene sheets. This allowed for a greater number of lithium ions in the electrode while utilizing the flexibility of graphene sheets to accommodate the volume changes of silicon during use. Rendering of the composite electrode with sandwiched Si clusters and in-plane defects. Clic...
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Patent watch: ELECTROLYTE COMPOSITIONS FOR BATTERIES USING SULPHUR OR SULPHUR COMPOUNDS

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There are disclosed electrolytes comprising solutions of lithium salts with large anions in polar aprotic solvents with a particular concentration of background salts. The concentration of the background salts is selected to be equal or close to the concentration of a saturated solution of these salts in the aprotic solvents used. The electrolytes disclosed can be used in chemical sources of electric energy such as secondary (rechargeable) cells and batteries comprising sulphur-based positive active materials. The use of such electrolytes increases cycling efficiency and cycle life of the cells and batteries. Inventors: Vladimir KOLOSNITSYN, Elena KARASEVA  Application number: 13/153,157 Publication number: US 2011/0236766 A1 Filing date: Jun 3, 2011 Fig. 1 Charge/discharge capacity fade of standard Li-S cell Fig. 9 Charge/discharge capacity fade of Li-S cell with a saturated electrolyte solution as 1.7M of LiClO4 in methylpropylsulfone @ 0.25C ch/dch Fast...
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Ceramic-filled Separators from Porous Power

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Unlike dense ceramic coatings applied as a separate layer on competing separators, PPT’s products contain ceramic particles that are thoroughly distributed throughout their chemically inert PVDF polymer. The particles reside primarily in the pore walls, leaving a large and uniform open pore structure that enables ions to pass through with less resistance and less heat generation.  * More power in high-current applications  * Reduced separator shrinkage  * Increased thermal stability with less cell degradation  * Extended cycle life * Higher bake-out and operating temperatures  * Improved puncture and abuse resistance    Although, the application of such separator may improve safety, however according to presented test data it will have minimal effect, or not significant. Depends on battery package, it may have serious explosion (due to electrolyte flammability) at much lower temperature.  
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