(상단)주메뉴 바로가기 (왼쪽)하위메뉴 바로가기 본문 바로가기 하단(Copyright) 바로가기

KAIST는[Travel] 세상을 향해 자유롭게 발을 내딛는 KAIST는 나의 길을 찾아 떠나는 여행이다

홈페이지가이드 Homepage Guide

Using Donut-shaped Lithium Sulfide for Higher Performing Batteries

작성자 : PR Office 등록일 : 2018-09-19 조회수 : 1200 메일 : kaistpr@kaist.ac.kr

from left: Research Professor Fangmin Ye and Professor Hee-Tak Kim
(from left: Research Professor Fangmin Ye and Professor Hee-Tak Kim)


A KAIST research team developed a lithium-sulfur battery with a doughnut-shaped active material structure showing a record lifecycle of over 600 cycles. Having higher energy density and lower production cost than a lithium-ion battery (LIB), it can be used in electric vehicles that require a longer battery life.

There has been an intense research conducted for developing lithium-sulfur batteries with high energy density because LIBs only allow for a very short travel distance per charge. However, Li-S batteries are still unable to provide a longer lifecycle due to the poor reversibility of the lithium metal cathode.

To tackle this issue, Professor Hee-Tak Kim from the Department of Chemical and Biomolecular Engineering and his team used lithium sulfide (Li₂S) cathodes and combine them with graphite anodes to enhance energy density and lifecycles for the batteries. 

Yet, lithium sulfide is costly and, so far, there has not been an electrode architecture and electrolyte design that enables a longer lifecycle between the graphite anodes and lithium sulfide cathodes. 

Hence, the team produced a doughnut-shaped lithium sulfide cathode active material from low-cost lithium sulfide developed from raw materials. They have also developed a lithium sulfide ion battery with a graphite anode and lithium sulfide cathode using a high concentration salt electrolyte. 

This doughnut-shaped lithium sulfide showed outstanding charge and discharge reversibility through improving the transfer of lithium ions. Its highly concentrated salt electrolyte formed a stable film on the surface of the graphite electrode, which showed strong durability. 

Through this technology, the team achieved 30% higher energy density than that of conventional LIBs and secured a lifecycle of more than 600 cycles. This doughnut-shaped lithium sulfide-based electrode can be manufactured using low-cost raw materials and a single heat treatment process. The electrode can also be applied to existing LIBs.

Professor Kim said, “We have demonstrated that applying low-cost sulfur compounds to LIBs can improve both energy density and the lifecycle simultaneously.”

This research, led by Research Professor Fangmin Ye, was published in Advanced Science on May 7. 


Figure 1. Structural characterization of Li₂SO₄/CNT and Li₂S/CNT electrodes and suggested mechanism for the formation of the holey-Li₂S nanoarchitecture
Figure 1. Structural characterization of Li₂SO₄/CNT and Li₂/CNT electrodes and suggested mechanism for the formation of the holey-Li₂S nanoarchitecture



파일 :

개인정보처리방침이메일주소집단수집거부

34141 대전광역시 유성구 대학로 291 한국과학기술원(KAIST) / T.042-350-2114 / F.042-350-2210(2220)

Copyright (C) 2014, Korea Advanced Institute of Science and Technology, All Rights Reserved.

Web Accessibility 인스타그램 유튜브 KAIST트위터 KAIST페이스북 정부 3.0