autoport power Lithium-ion batteries manufacturer
Most batteries contain three basic parts: electrodes, an electrolyte and a separator There are two electrodes in every battery. Both are made of conductive materials, but they serve different roles. One electrode, known as the cathode, connects to the positive end of the battery and is where the electrical current leaves (or electrons enter) the battery during discharge, which is when the battery is being used to power something. The other electrode, known as the anode, connects to the negative end of the battery and is where the electrical current enters (or electrons leave) the battery during discharge. Between these electrodes, as well as inside them, is the electrolyte. This is a liquid or gel-like substance that contains electrically charged particles, or ions. The ions combine with the materials that make up the electrodes, producing chemical reactions that allow a battery to generate an electric current. The first stage in the assembly process is to build the electrode sub-assembly in which the separator is sandwiched between the anode and the cathode. Two basic electrode structures are used depending on the type of cell casing to be used, a stacked structure for use in prismatic cells and a spiral wound structure for use in cylindrical cells.
autoport power Lithium-ion batteries manufacturer
As modern energy storage needs become more demanding, the manufacturing of lithium- ion batteries (LIBs) represents a sizable area of growth of the technology. Specifically, wet processing of electrodes has matured such that it is a commonly employed industrial technique. Despite its widespread acceptance, wet processing of electrodes faces a number of challenges ,including expensive and dangerous solvent recovery, cut-off waste, coating inconsistencies, and micro structural defects due to the solvent drying process. Since their inception in 1991, lithium-ion batteries (LIBs) have emerged as a sophisticated energy storage formulation suitable for applications such as cellular phones, laptop computers, and handheld power tools. Recently, LIBs have received widespread acceptance as the most suitable power source for many alternative fuel vehicles, including fully-electric battery electric vehicles, that could play a meaningful role in combatting anthropogenic climate change. While several studies have been dedicated to materials discovery, notable progress has been made on the engineering front as well The incentive for improving electrode fabrication lies largely in the ability to significantly increases the volume ratio of active materials in LIBs, resulting in higher energy density and lower cost. The electrode manufacturing procedure is as follows: battery constituents, which include (but are not necessarily limited to) the active material, conductive additive, and binder, are homogenized in a solvent. These components contribute to the capacity and energy, electronic conductivity, and mechanical integrity of the electrode. It is important that the mass ratios between ingredients be such that the optimal combination of properties is attained . Moreover, the selection of solvent will dictate which binders are suitable, as well as whether additional additives will be required. The resulting suspension is referred to as the electrode slurry, which is then coated onto a metal foil, i.e. Al and Cu foils for positive electrodes and negative electrodes, respectively. While materials are the most expensive component in battery cost, electrode manufacturing is the second most expensive piece, accounting for between 20 and 40 percent of the total battery pack cost, with between 27 and 40 percent of this cost coming from electrode preparation. The two most paramount features of a viable electrode slurry are that it is stable and processable. Given that electrode slurries contain active particles that are substantially larger than molecules comprising the solvent and that are responsive to Brownian motion, they may be approximated as colloidal suspensions . The stability of a slurry is evaluated by its ability to combat detrimental naturally-occurring phenomena, specifically agglomeration and sedimentation. Agglomeration can take place due to relatively weak van der Waals attractions or, more rarely and harmfully, relatively strong electrostatic interactions due to surface charges . Water-based slurries provide an environment conducive to agglomeration due to comparatively strong hydrogen bonding and electrostatic forces; because of this, they often require the addition of a dispersant, which supplies an electrostatic barrier. Aqueous slurries also suffer from poor wettability onto current collectors, though strategies have been developed to increase the surface tension of current collectors and decrease the surface energy of slurries . Additionally, the basicity of aqueous cathode slurries commonly leads to corrosion of the aluminum current collector. This complication is particularly serious for aqueous suspensions containing nickel-rich active materials . Among the best methods to prevent corrosion are the addition of phosphoric acid (thus dropping the slurry’s pH) or preventing direct contact between active material and aluminum through a metal oxide coating on the active material or a carbon coating on the current collector. Once the electrode slurry is coated, the solvent must be evaporated from the film in a drying step. Electrode drying is a complex process since it involves mass transfer in the solid, liquid, and vapor phases, as well as heat transfer. During drying, there are three competing physical processes evaporation of the solvent, diffusion of the binder, and sedimentation of the particles .
autoport power Lithium-ion batteries manufacturer , advanced chemistry cell
Improved Process Simultaneous 2-side coating systems provide many benefits, the complete electrode plant increases these benefits by translating them to all process steps: Powder Handling Slurry Mixing Coating & Drying Calendering/Roll Pressing Secondary Drying Slitting NMP Recovery & Purification Lower total costs Simplified process design requires lower capital investment. In addition, simultaneous two-sided coating with inline calendering/roll pressing reduces operating costs: Heating only 1 dryer Fewer operators Less material waste Increased yield Integrated solvent recovery and refining: Includes heat recovery to reduce utility demand Minimizes waste Provides cost savings by capturing >99% of NMP Improved quality Two-sided coating coupled with flotation drying offers: Improved Side A to Side B alignment No edge curl after drying Drying consistency for improved yield Reduced wrinkles due to flotation drying Integrated solvent recovery and refining: Collects the NMP with condensation to minimize contamination Purifies on site with highest quality Closes loop for solvent recycling Simplified material flow With a straight-path product flow and single-level machine: The factory layout can be linear Direct slurry piping to a single coating station Reduced coating-area floor space
autoport power Lithium-ion batteries manufacturer , advanced chemistry cell
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