{"id":2664,"date":"2023-04-24T09:22:33","date_gmt":"2023-04-24T07:22:33","guid":{"rendered":"https:\/\/www.jauch.com\/blog\/?p=2664"},"modified":"2023-04-24T09:35:32","modified_gmt":"2023-04-24T07:35:32","slug":"ask-the-doctor-of-chemistry-why-cant-primary-lithium-batteries-be-recharged","status":"publish","type":"post","link":"https:\/\/www.jauch.com\/blog\/en\/ask-the-doctor-of-chemistry-why-cant-primary-lithium-batteries-be-recharged\/","title":{"rendered":"Ask the doctor of chemistry: Why can\u2019t primary lithium batteries be recharged?"},"content":{"rendered":"\n

Lithium batteries are one of the most widely used types of batteries and serve a variety of applications, including electronic devices and energy storage. We know these batteries mainly from our smartphones, wearables, or cars, which we can recharge time and again. However, there are battery chemistries with lithium that cannot be recharged. These include, for example, the lithium thionyl chloride battery (ER types)<\/a> or the lithium manganese dioxide (CR types). <\/a><\/p>\n\n\n\n

\"Primary
Primary lithium batteries must not be recharged.<\/figcaption><\/figure><\/div>\n\n\n\n

But why can\u2019t these batteries be recharged? And why is this not a problem with lithium-ion <\/a>or lithium-polymer batteries<\/a>? That’s what we asked our doctor of chemistry, J\u00fcrgen Heydecke:<\/p>\n\n\n\n

Primary lithium batteries contain metallic lithium. \u201cYou can\nthink of it as a foil or cylinder of lithium that is bright and silvery in the\nbattery,\u201d says J\u00fcrgen Heydecke. When the battery is discharged, the lithium is\n\u2018consumed\u2019. It passes into the electrolyte and thus also into the cathode. \u201cIf\nthe cell were to be recharged, the lithium would be deposited on the anode in\nan acicular shape rather than smoothly. These deposits are shaped like\ndendrites. These could create an internal short circuit through the porous\nseparator. In this scenario, the lithium would melt and a thermal runaway would\nbe the possible consequence,\u201d Heydecke explains.<\/p>\n\n\n\n

Dendrites are small branches that look like the extensions of nerve cells. However, they represent electrochemical deposits on the electrodes of a battery. Dendrites are formed when the lithium migrates through the electrolyte over time and is deposited on the cathode. This can cause the dendrites to grow through the separator and cause a short circuit.<\/em><\/p>Dr. J\u00fcrgen Heydecke, Jauch Quartz GmbH<\/cite><\/blockquote>\n\n\n\n

\u201cThat’s not the case with rechargeable batteries. Research\ninto suitable intercalation materials has been carried out for a long time,\u201d\ncontinues Dr. J\u00fcrgen Heydecke. This refers to the substance into which the\nlithium ions intercalate, i.e., where they are stored. Nowadays, carbon is the\nmain material used for this purpose. During charging, the lithium ions are\nstored in the individual layers of the grid. The advantage: this can be done\nwithout the formation of dendrites. <\/p>\n\n\n\n

Consequently, dendrites do not usually form in rechargeable\nlithium batteries, which has a positive effect on battery safety. However,\nthere is an exception here, too, Heydecke explains. \u201cAs long as the batteries\nare charged according to the specification\/operating instructions, there is no\nrisk. But if the working temperature range or the currents are not observed\nduring charging, then there is a risk that the lithium will not be deposited in\nthe carbon layers, but on the outside. This is the same as in primary lithium\nbatteries with plating of the electrodes by lithium. It can also lead to\nshort-circuiting or burning of the cell.\u201d<\/p>\n\n\n\n

\"silver
With regard to deposits, solid-state batteries would be a solution approach.<\/figcaption><\/figure><\/div>\n\n\n\n

\u201cAn even safer approach would be to use a solid electrolyte\nin the lithium battery. Currently, a lot of research is being done on these\nsolid-state batteries. The only thing that\u2019s missing is production experience\nfor the appropriate material for high currents,\u201d Heydecke concludes.<\/p>\n","protected":false},"excerpt":{"rendered":"

Lithium batteries are one of the most widely used types of batteries and serve a variety of applications, including electronic devices and energy storage. We know these batteries mainly from our smartphones, wearables, or cars, which we can recharge time and again. However, there are battery chemistries with lithium that cannot be recharged. These include,<\/p>\n","protected":false},"author":6,"featured_media":2665,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[298,349],"yoast_head":"\nAsk the doctor of chemistry: Why can\u2019t primary lithium batteries be recharged? – Jauch Blog<\/title>\n<meta name=\"description\" content=\"Lithium batteries are widely used. But not all lithium chemistry is rechargeable. Why is that? And what happens if one does? 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