wolle電池を組む実験中の様子全固体リチウムイオン電池は現行電池よりも安全性に優れていることなどから次世代電池として注目を集めています。しかし、リチウムイオンを挿入・脱離する電極活物質自体はリチウムイオン伝導性に乏しいことが問題です。活物質に固体電解質を混合することで解決可能ですが、エネルギー密度が低下してしまいます。陳フェローは、充電と放電の両方の状態でリチウムイオン導電性を有する電極材料を研究しています。基礎的なメカニズムの理解から実用化に至るような優れた電池の開発につなげてくれるのではないかと期待しています。18Q-Energy Innovator FellowshipCHEN Yixin総合理工学府総合理工学専攻博士後期課程1年先導物質化学研究所 准教授For the electrode composite of all-solid-state batteries, it is necessary to mix with solid electrolyte and carbon additives to supply the ionic conduction and electron conduction pathways. This approach will decrease the energy density of an ASSB be-cause the added solid electrolyte and carbon components do not directly contribute to the capacity of the battery and even cause the side reactions. Hence, if the content of active material in a composite electrode mixture can be maximized without losing ionic conductivity and without compromising contact with the electrolyte then the energy density of an ASSB could be dramati-cally improved. This would represent an encouraging new strat-egy to composite electrode design. Our group therefore focused on the active material which can generate the solid electrolyte by electrode reaction. By using the mechanism of in-situ forming of solid electrolyte, its electrode performance is similar with elec-trode composite mixed with solid electrolyte in advance. Mean-while, this method could significantly increase the content of ac-tive material included in the electrode mixture and improve the actual capacity of batteries. We have also reported some successful cases of solid elec-trolyte in-situ formed active materials, such as Mg(BH4)2 and MgH2. Importantly, a solid electrolyte is not required as a part of Mg(BH4)2 and MgH2 composites due to the in-situ formation of LiBH4 and LiH electrolyte in the electrode layer during lithi-ation. This thus negates the need to add solid electrolyte to the anode in advance. Moreover, the Li-ion conductivity of in-situ formed solid electrolyte is considered to play an essential role in the charge-discharge performance of batteries, especially the bat-tery performance with thickened electrode layer. Active material which generates the LiBH4 (high ionic conductivity) during the electrode reaction also showed a remarkable performance even with thick electrode layers. However, there are also other factors we have not clearly understood. It was believed that the deep un-derstanding of in-situ forming ionic conduction pathway is helpful to design the high-capacity electrode configuration. In the future, we aim to further investigate the formation mechanism of in-situ formed solid electrolyte and develop the anode with high capacity by increasing the content of active material.指導教員からメッセージアルブレヒト 建Investigation of the solid electrolyte in-situ form-ing mechanism by hydride anode水素化物負極における固体電解質自己生成メカニズムの解明陳 伊新13f
元のページ ../index.html#20