Performance Requirements of High - Low Temperature for Lithium Sub - Batteries in Application Enviro

Published time: 2017-1-15 8:23:46, Publisher: Green Energy Battery Co., Ltd

Lithium sub-batteries, full name lithium - thionyl chloride batteries, lithium thionyl chloride batteries in all the batteries, are a very unique species. Its voltage is 3.6V. The cathode material is thionyl chloride (thionyl chloride), and also the electrolyte. This characteristic makes its specific energy very high. Is the highest voltage lithium battery. Storage life can be more than 10 years.

Lithium-thionyl chloride battery cell works: Li / SOCl2 battery to lithium as cathode, carbon as a positive, anhydrous lithium tetrachloroaluminate (LiAlCl4) SOCl2 solution as electrolyte, SOCl2 is the cathode active material. LiFePO4-SOCl2 / C negative electrode: 4Li = 4Li + + 4e Positive electrode: 2SOCL2 + 4e = 2SO2 + 4Cl-2SO (3) Sulfur dioxide battery Total reaction: 4Li + 2SOCl2 → 4LiCl + S + SO2 SO2 all dissolved in SOCl2, S a large number of precipitation, deposition in the cathode carbon black, LiCl is insoluble. This kind of battery, Li and SOCl2 contact, the reaction occurs as follows: 8Li + 4SOCl2 → 6LiCl + Li2S2O4 + S2Cl2 or 8Li +3SOCl2 → 6LiCl + Li2SO3 +2S Because of this reaction, although the Li / SOCl2 battery cathode active material SOCl2 tightly surrounded the negative electrode, but in fact did not happen short circuit phenomenon, this is because the negative electrode surface to form a layer of very thin dense LiCl protective film (primary film), this film has electronic insulation, the ion can wear So as to prevent the external SOCl2 and lithium further reaction, the lithium in SOCl2 electrolyte becomes very stable, with the ambient temperature and battery storage time, the primary film will gradually expand the thickening of the so-called two Sub-film, the battery also has a very good shelf life. 

As a result, Li / SOCl2 battery has a more serious voltage hysteresis phenomenon, the hysteresis of the voltage in a few minutes to restore the peak voltage to 95%. The LiCl film formed on the surface of the LiCl layer can be destroyed by the initial voltage of the LiCl / SOCl2 battery after two years storage at 25 ℃, such as short circuit of the battery or intermittent discharge with large current for several times. restore. The products LiCl (white) and S (yellow) were deposited in the positive carbon black, partially blocking the micropores in the positive electrode. On the one hand, some positive expansion, on the other hand hinder the diffusion of the electrolyte, increasing the concentration of polarization, the battery gradually failure.

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