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Graphene battery too Ethereal, existing power lithium battery mark

Number of visits: Date:2015-06-15
Graphene battery too Ethereal, existing power lithium battery mark

 Since Tesla was the hot technology, almost every once in awhile will pop out a few high-tech battery electric vehicle news. What Toyota hydrogen fuel electric runs 1600 kilometers of aluminium battery electric cars, redox flow battery car runs 600 kilometers on a single charge, Graphene, batteries, aluminum ion battery ... ...
Seems, we now use lithium-ion batteries are too dense, the new energy revolution should have arrived, but it's really as good as news describes it? We take a look at the truth.
   The truth, electric-car batteries
   Is core technology in electric car batteries, electric motors, electrical control, then there are things like traditional car chassis technology. Which motor technology is now mature, electronically controlled with Moore is improving, chassis development for so many years, but is not a bottleneck.
   Core of the electric car just above the battery. For electric vehicles, theideal battery should have the following characteristics
    There is enough energy density per unit volume per unit weight should have sufficient capacity, so run a long way.
     has enough power density per volume unit weight can produce enough power, so that the vehicle can accelerate faster, climbing.
     energy faster, faster charging or battery swapping, or can restricted to the urban commuting, running during the day at night charging mode.
     average cost is cheaper, life expectancy and the price to be competitive.
  Now listing of electric vehicles, there are two main batteries, a high-speed electric lithium-ion batteries, including lithium, lithium manganate, ternary lithium iron phosphate battery, and so on. There is also a low speed electric vehicle lead-acid batteries.
  Electric car requirements, lithium battery energy density and power density are good, but charging not fast, the price is high. No subsidies to support it, can only be used for the Tesla model of this high position.
   Lead-acid battery energy density and power density is low, charge is slow, but the price is relatively cheap, used in short-distance low-speed electric vehicles is more appropriate. But there is the problem of pollution, China does not encourage development.
   Other rumors of cattle in the battery, the battery, unfortunately, has not been able to mass production on the road, there are several experimental buses in use. Through practice, reality can scale using just these two. Gossip intermediate cells or unreliable, or still in the laboratory stage.
 Second、Legend of the advanced batteries
 Let Japan get a hydrogen fuel cell, fuel cell can be understood as a fuel to produce electricity, and generally do not charge the battery. That is, the charging of hydrogen fuel cells is actually filling hydrogen, and our traditional filling is the same.
Advantages of hydrogen fuel cell electric vehicle is no pollutant emissions, hydrogen to power the motor-driven vehicles, as long as we have hydrogen refueling stations replace gas stations can.
   This process looks very easy, but wrong on the manufacture, transportation, storage of hydrogen. Gaseous hydrogen high-pressure gas tank, requiring a lot of power to maintain liquid hydrogen at very low temperatures. Use far more fuel trouble.

   Although hydrogen manufacture is not very difficult, but transported to build several hydrogen hydrogen refueling stations would require laying special pipes. Hydrogenation of hydrogen refueling stations for hydrogen fuel-cell electric vehicle, also requires specialized equipment. (Hydrogen embrittlement, have high requirements for the transmission and storage of materials, is easy to leak explosive combustion of hydrogen, the safety requirements are very high)
   Fuel, natural gas has a ready-made infrastructure can be used, lithium-ion batteries have a ready-made network can be used. Hydrogen fuel cell electric vehicles need to start from scratch and establish a manufacture, transport, storage system, complete the infrastructure. This too difficult.
   So, unless they are government subsidies regardless of the cost of building a full-service infrastructure, or hydrogen fuel cell electric vehicle is a vase. Japan because Japan all over the entire hydrogen fuel chain occupies high ground, others will not be so stupid, he invested heavily in the reconstruction of a system, also control the lifeline of the Japanese, so difficult to promote hydrogen fuel cells.
  Aluminum-air battery
  Although metal aluminum-air battery battery, should also be counted as a fuel cell. Usually of aluminum-air battery is not charging, simply replace the aluminum.
   Principle of aluminum-air batteries hearing aids inside similar common zinc-air batteries.
 Advantages of the metal fuel cells are energy density ratio, disadvantage is the low power density. Used in low-power hearing aid, that there is no problem, with not enough power in the car, often used with high power lithium-ion batteries.

   Zinc-air batteries compared to more mature, already have mass production, also tried in the car.
   Aluminium air fuel cell than the higher energy density zinc-air batteries, have a better future, but because Al property issues, it is difficult to guarantee security and stability, even mass-produced products are not practical as premature.
   Moreover, metallic fuel cell because they do not charge, also faced chain problems. Whether the zinc-air battery or the aluminum-air battery, are following this cycle.
 1 electrolytic metal oxides, metal factory manufacture of metal;
 2, metal transport to change station
 3, for replacing metal for power users of electric vehicles in the metal oxides (metal battery discharge complete build-n-oxide)
 4, re electrolysis factory recovery oxides into metal.
  In this process, the need to establish a manufacturing to shipping, to replace, to the recycling industry chain. Also involve infrastructure construction. Set up all over the country for power station is almost mission impossible.
   So, even if the aluminum-air batteries work, only for city bus, rent a fixed position (taxi cab, bus transit company) places. Universal access to hydrogen and fuel cells the same difficulties.
  Redox flow battery
  Redox flow battery is a common chemical batteries, its characteristics are kept separate anode and cathode electrolytes, solves the problem of utilization of active material to ordinary chemical. Theoretically, has a higher energy density, and the number of charge and discharge more, very good performance.
   Redox flow batteries are subject to material and the electrolyte concentration, develop energy density remains low for many years, plants can be used for energy storage, not to the car.
  Recently, MIT scientist Dr Jiang Yeming invented lithium semi-solid flow battery, made innovations in materials, electrolyte concentration increases, the energy density and power density to a practical level.
   However, Dr Jiang's battery is still in the laboratory stage, finished there is still time to maturity, not to mention the mass production.
   NanoFlowcell AGCompany flow battery car, from its specification is given, seems to be a very high energy density can be practical, current vehicle has begun testing. But true or not has yet to be verified.
However, redox flow battery is the most recent more reliable we see all sorts of advanced battery, as long as the laboratory technology into mass production, can make a real change in the electric car industry. Electric cars run farther, cheaper (principle of redox flow battery decided it using less expensive materials), faster charging (redox flow battery can be recharged through the grid, or you can directly replace the electrolyte completed rapid charge, but replace the electrolytes need industry chain)

   Looks beautiful Graphene battery
   Graphene has a lot of surface area, can carry more lithium ions, and are fast losing lithium ion, this kind of characteristic for lithium-ion batteries to increase capacity, speed up the charge and discharge provides a physical basis.
   But in the experiment, graphite anode for lithium-ion battery cycle life is very poor, charging and discharging, but fails twice, apparently not.
   Then, people began the development of a wide variety of composite materials tomake negative, trying to find a material that can fast charge, long cycle life, high energy density, low cost combined.

  Many papers in the laboratories, but practical things have not recently, Spain world news that Spain a University out of a battery of Graphene in high charge and discharge rate at the same time, also have a longer life cycle, the higher the energy density and the slightly lower cost than current lithium-ion batteries. Germany car companies will begin testing.
   If the reports are true, then the battery is very promising, maybe will change the fate of the electric vehicle, refueling time and charging time, the charging station can replace gas stations, electric cars are really alternative fuel vehicles.
  There is a reasonable
   Our current listed electric vehicles using lead-acid batteries, lithium batteries, not electric car business stupid, don't know the use of new technologies, but in the current energy supply capacity of batteries, only two are available spectrum, or the technology is immature, or is unable to support the industry chain, or is the cost too high cannot be commercial.
  In addition to several batteries of ahead of us, and flywheel battery, nuclear battery, super capacitor ... ... Are often laboratory looks beautiful, but still has no practical message, so after seeing this kind of obscenity, you can laugh it off, not seriously.
   There is that is reasonable, a battery could do practical, 35, will be widely used, and there is no, must have been a problem. Battery breakthrough will change the future, but we have to be patient.

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