Nuacht Tionscail

Cosc ar chaillteanas litiam do chadhnraí litiam-ian ardchumais

2021-07-30



Creidmheas: Institiúid Eolaíochta agus Teicneolaíochta na Cóiré

 

D'fhorbair foireann taighdeoirí Cóiré teicneolaíocht phróiseála chun dlúis fuinnimh cadhnraí ardchumais a uasmhéadú. D’fhógair an chomhfhoireann taighde, ar a bhfuil an Dr. Minah Lee agus an Dr. Jihyun Hong ón Institiúid um Fhuinneamh Glan, Institiúid Eolaíochta agus Teicneolaíochta na Cóiré (KIST), forbairt teicneolaíochta a sholáthraíonn réiteach simplí ar shaincheist mharthanach a bhaineann léi le hábhair anóid (-) sileacain-bhunaithe.

 

Le déanaí, ábhair anóid sileacain atá in ann ceithre huaire níos mó a stóráillitiamiain ná ábhair anóide graifíte ilitiam-ion batteries have gained growing attention due to their potential to improve the mileage of electric vehicles. But when charged in the initial cycle, a ceallraí with a silicon-based anóid loses more than 20% of the litiam ions it uses for electricity storage, which results in an issue of reduced ceallraí capacity. To resolve this issue, researchers have studied a method of litiam pre-loading, or pre-lithiation, which is adding extra litiam before ceallraí assembly to compensate the litiam loss during ceallraí cycling. Methods applied so far, such as using litiam powder, have drawbacks including safety hazards and high cost.

 

Dr. Lee and Dr. Hong of KIST have developed a technology that enables the pre-loading of litiam ions using a litiam-containing solution rather than litiam powder, preventing litiam loss in a silicon-based anóid. Submerging an electrode in the tailored solution for just five minutes is enough to achieve successful litiam pre-loading, by which electrons and litiam ions are inserted in the silicon-based anóid through a spontaneous chemical reaction. Unlike the conventional method of adding litiam powder to an electrode leading to heterogeneous litiam distribution, the tailored prelithiation solution rapidly seeps into an electrode, ensuring homogeneous delivery of litiam into silicon oxide.

 

The prelithiated silicon-based anóid developed by the research team loses less than 1% of active litiam in the first charge, yielding a high initial ceallraí efficiency of 99% or higher. A ceallraí manufactured with the prelithated anóid exhibited an energy density 25% higher than that of a comparable ceallraí using a graphite anóid available on the market (406 Wh/kg—504 Wh/kg).

 

Dúirt an Dr. Lee, a bhí i gceannas ar an taighde, "Trí theicníc eolaíochta ábhair ríomha a ionchorprú i ndearadh an struchtúir mhóilíneach is fearr, bhíomar in ann éifeachtúlacht struchtúir ardchumais, bunaithe ar sileacain a fheabhsú.anóidtrí léim agus teorainneacha leis an modh simplí chun teocht an tuaslagáin agus an t-am imoibrithe a rialú. Toisc go bhfuil an teicneolaíocht seo infheidhmithe go héasca maidir leis an bpróiseas rolladh-go-rolla a úsáidtear sa phróiseas atá ann cheanaceallraí manufacturing facilities, our method has potential to achieve a breakthrough in the implementation of silicon-based anóids for practical batteries."

 

Dúirt an taighdeoir comh-luaidhe, an Dr. Hong, "D’fhéadfaí an obair chomhoibritheach seo a bhaint amach toisc go spreagann KIST comhthaighde idir baill ó fhoirne taighde éagsúla. Is féidir leis an teicneolaíocht réamhlitrithe seo míleáiste feithiclí leictreacha a mhéadú 100 km ar an meán."