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웨어러블융합전자연구소 초청 세미나_12/28(수) 오전11시 관리자 │ 2022-12-26 HIT 101
* 세미나 제목 : Cation-exchange strategy in Ni-rich layered cathode materials for Li-ion batteries Abstract High-nickel content (>90 %) layered ternary metal oxide cathodes often have been recognized as state-of-the-art for rechargeable secondary lithium-ion (Li⁺) batteries while satisfying the energy density requirements in smart grids and heavy electrical vehicle appliances. However, they still pursue their structural irreversibility issues and rapid electrochemical performance failure at a high-voltage platform. The complete underlying structural degradation mechanisms are not fully understood and are still inadequate. Herein, we put forward a novel cation-exchange strategy in hierarchical Ni-rich layered materials to modulate the large-size primary particles into nano-size and further aim to prevent the rapid capacity fade viabilities. The prepared cation-exchanged samples further revealed with rich cobalt gradient in the smaller primary particles and substantially enhanced cyclability test as compared to the pristine LiNiO₂and directly cobalt-mixed LiNiO₂electrodes. The possible rock-salt phases in between the Ni²⁺and Li⁺ were precluded by the cation-exchanged electrode in the long-term cycling. In-situ electrochemical impedance spectroscopy analysis was also analyzed to manifest the Li⁺ diffusion coefficient and kinetic behaviors in the cathode materials. The obtained electrochemical results from the feasible novel cation-exchange strategy could provide a new possibility to develop Li⁺batteries on a large scale. * 일시 : 2022년 12월 28일(수) 오전 11시 * 연사 : Khaja Hussain Shaik 박사 (한양대학교 나노센서 연구) * 장소 : 경희대 국제캠퍼스 전자정보대학 5층 509호 세미나실 * 코로나관련 세미나 참석시 마스크 착용 의무화를 실시하오니 많은 협조 부탁드립니다.

웨어러블융합전자연구소 초청 세미나_12/28(수) 오전11시

관리자 │ 2022-12-26

HIT

101

* 세미나 제목 : Cation-exchange strategy in Ni-rich layered cathode materials for Li-ion batteries

Abstract

High-nickel content (>90 %) layered ternary metal oxide cathodes often have been recognized as state-of-the-art for rechargeable secondary lithium-ion (Li⁺) batteries while satisfying the energy density requirements in smart grids and heavy electrical vehicle appliances. However, they still pursue their structural irreversibility issues and rapid electrochemical performance failure at a high-voltage platform. The complete underlying structural degradation mechanisms are not fully understood and are still inadequate. Herein, we put forward a novel cation-exchange strategy in hierarchical Ni-rich layered materials to modulate the large-size primary particles into nano-size and further aim to prevent the rapid capacity fade viabilities. The prepared cation-exchanged samples further revealed with rich cobalt gradient in the smaller primary particles and substantially enhanced cyclability test as compared to the pristine LiNiO₂and directly cobalt-mixed LiNiO₂electrodes. The possible rock-salt phases in between the Ni²⁺and Li⁺ were precluded by the cation-exchanged electrode in the long-term cycling. In-situ electrochemical impedance spectroscopy analysis was also analyzed to manifest the Li⁺ diffusion coefficient and kinetic behaviors in the cathode materials. The obtained electrochemical results from the feasible novel cation-exchange strategy could provide a new possibility to develop Li⁺batteries on a large scale.

* 일시 : 2022년 12월 28일(수) 오전 11시

* 연사 : Khaja Hussain Shaik 박사 (한양대학교 나노센서 연구)

* 장소 : 경희대 국제캠퍼스 전자정보대학 5층 509호 세미나실

* 코로나관련 세미나 참석시 마스크 착용 의무화를 실시하오니 많은 협조 부탁드립니다.

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