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Sökning: WFRF:(Johns Phil)

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1.
  • Roberts, Matthew, et al. (författare)
  • 3D lithium ion batteries-from fundamentals to fabrication
  • 2011
  • Ingår i: Journal of Materials Chemistry. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 21:27, s. 9876-9890
  • Tidskriftsartikel (refereegranskat)abstract
    • 3D microbatteries are proposed as a step change in the energy and power per footprint of surface mountable rechargeable batteries for microelectromechanical systems (MEMS) and other small electronic devices. Within a battery electrode, a 3D nanoarchitecture gives mesoporosity, increasing power by reducing the length of the diffusion path; in the separator region it can form the basis of a robust but porous solid, isolating the electrodes and immobilising an otherwise fluid electrolyte. 3D microarchitecture of the whole cell allows fabrication of interdigitated or interpenetrating networks that minimise the ionic path length between the electrodes in a thick cell. This article outlines the design principles for 3D microbatteries and estimates the geometrical and physical requirements of the materials. It then gives selected examples of recent progress in the techniques available for fabrication of 3D battery structures by successive deposition of electrodes, electrolytes and current collectors onto microstructured substrates by self-assembly methods.
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2.
  • Roberts, Matthew, et al. (författare)
  • Dip-spin coating of reticulated vitreous carbon with composite materials to act as an electrode for 3D microstructured lithium ion batteries
  • 2013
  • Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753 .- 1873-2755. ; 224, s. 250-259
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper describes a new and economic route for the formation of three dimensional (3D) microstructured battery electrodes using our "in house" developed dip-spin coating technique for depositing layers of active material onto reticulated vitreous carbon (RVC) substrates. These coatings are optimized composite materials containing carbon black and polymer binder to facilitate good electronic and ionic conductivities through the electrode. The application process begins by immersing the substrate in an ink followed by rapid spinning to provide a uniform coating with a well controlled mass loading. The performance of the electrodes was investigated in lithium ion cells as a function of the composition of the inks used and the number of dip-spin coating cycles. Optimization of the ink composition, dip and spin parameters has improved the electrochemical performances of the electrodes to give state of the art footprint area specific capacities (>1000 mu A h cm(-2)) and high rate capabilities (nearly 50% degree of discharge at 25 C) in lithium half cells. This represents the first stage in the development of a full 3D microbattery system. Initial results have also shown the versatility of this approach in depositing other electrode materials by forming uniform layers of both TiO2 and LiMn2O4.
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