LITHIUM ION CONDUCTIVE SULFIDE-BASED SOLID ELECTROLYTE COMPRISING NICKEL SULFIDE AND ALL-SOLID STATE BATTERY USING THE SAME

• Main Authors: SUNG, JU YOUNG, JUNG, HUN GI, LEE, YOON SUNG, LEE, HO TAEK, LEE, JONG HO, LEE, YONG SUNG, JANG, YONG JUN, CHO, SOO YOUNG, KIM, HYOUNG CHUL
• Format: Patent
• Language: English; Korean
• Published: 08.06.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

본 발명은 황화니켈을 포함하여 종래와 다른 구조와 성능을 갖는 리튬 이온 전도성 황화물계 고체전해질에 관한 것이다. 구체적으로는 본 발명에 따른 황화물계 고체전해질은 황화리튬(LiS), 5황화2인(PS) 및 황화니켈(NiS)를 특정한 몰%비로 포함하여, 니켈(Ni) 원소에 의해 신규한 결정상의 구조를 보인다. 이에 따라 종래의 황화물계 고체전해질보다 리튬 이온 전도도가 높고, 결정상이 안정적이다. Disclosed is a lithium ion-conductive sulfide-based solid electrolyte which includes nickel sulfide and, accordingly, the solid electrolyte can obtain a novel structure and performance. More particularly, the sulfide-based solid electrolyte includes lithium sulfide (Li 2 S), diphosphorus pentasulfide (P 2 S 5 ), and nickel sulfide (Ni 3 S 2 ) in a specific ratio by mol% and exhibits a novel crystal structure due to nickel (Ni). Accordingly, the sulfide-based solid electrolyte has greater lithium ion conductivity than an conventional sulfide-based solid electrolyte and a stable crystal structure.