The next generation of lithium batteries lithium air battery

Nov. 26, 2010 - PRLog -- Experts predict that a anion called FSI (FluoroSulfonylImide) is expected to be alternative of material TFSI. This material is different with TFSI, the left and right not with the CF3, but F. F is smaller than CF3, thereby reduce the overall size. As mentioned above, ion small, the charge density will become larger, easy to form crystals, but the extent of the size of the ions, the smaller the viscosity the easier it is lower, the better. Because the ionic resistance through the ionic liquid is the viscosity of the liquid itself, the campaign to promote the charge.

Negative ions has been said above, in fact, positive ions are also a number of options. For example, you can use called EMI (1-ethyl-3-methylimidazolium) substances. The melting point, the use of TFSI salt is -18 ℃, using the FSI of the salt is -12.9 ℃, the actual application there are no major differences. The different viscosity at 25 ℃, FSI dropped from 32.6mPa • s 17.9mPa • s, decreased by about half. Moreover, FSI for the electrolyte, reflecting the performance of the ionic conductivity increased from 9.1mS/cm 16.5mS/cm, increased nearly doubled. These indicators, though not as widespread use of organic solvent present, but with the organic solvent is the same level. This, FSI is expected to be applied to the battery.

Battery on trial in the actual experiment, was not unexpected results: FSI and TFSI different, will not damage the cathode. The TFSI damage when there is negative for the battery of serious problems. But for unknown reasons.

Although not yet evaluated the performance of the stage, but it is not corrosion anode, at least the basic job performance has been confirmed. As the "full potential" (Kansai University, Ishikawa), so performance will improve in the future.

To achieve solid state battery technology of particles coated

Abandoned the organic solvent is a second way to solid state batteries. Positive and negative originally solid, then you can simply become a solid electrolyte. Osaka University has been studying the use of full-sulfide solid electrolyte type battery(mobile phone battery). For example, heating Li2S-P2S5 glass-like cells after the crystallization, the room temperature conductivity reached 10-3S/cm above. Has been achieved with the current use of the same level of liquid electrolyte. Moreover, the conductivity may also further increase is expected to be reached "7 times" the goal of "dark horse."

Osaka University in April 2009 jointly issued with the Toyota battery for all solid particles coated technology. All solid-state lithium rechargeable battery and the accumulation of a thin film type(dry cell battery). To use in the car, the capacity is the decisive factor, so the University of Osaka Prefecture, to improve the capacity of the accumulation type carried out vigorously developed. Specific approach is the negative active material, cathode active material and solid electrolyte particles made of three samples, respectively, in accordance with the shades gradually change the level of mixing ratio method, the blending and overlapping.


The difficulty lies in the method of contact resistance of grain boundary. In this case, if the central liquid electrolyte can be used "wet" phenomenon to ensure solid contact with the liquid. The difference between solid and micro view only point of contact. In this regard, the industry has been taking pressure slight deformation of the particles occurs, thus increasing the contact area of the development of ideas.

Osaka Prefecture University, but chose another direction as a breakthrough by using a solid electrolyte thin film coating the surface of electrode active material particles, to reduce the contact resistance. Electrode active material used LiCoO2 (lithium cobalt oxide), Li2S-P2S5 solid electrolytes type of material used, the particles coated by PLD (pulsed laser ablation deposition) method.

PLD is a thin film deposition methods. Target is to use laser ablation, sputtering out of the target material in the form a thin film on the floor. This practice is set in the above target, set in the floor below. Side of the floor vibration, so that LiCoO2 particle flow, while the particles deposited on the surface of the solid electrolyte to form a film. The particles manufactured using all solid-state unit, and use the time of manufacture without the coated particles compared to larger capacity unit. Confirmed the effectiveness of coated particles, so that all solid battery to the practical a major step forward.

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