Roh, Ha-Kyung Lee, Geon-Woo Haghighat-Shishavan, Safa Chung, Kyung Yoon Kim, Kwang-Bum 2024-01-19T17:34:43Z 2024-01-19T17:34:43Z 2021-09-05 2020-04-01 1385-8947 https://pubs.kist.re.kr/handle/201004/118745 Nano-sized oxides are investigated to improve rate capability by decreasing ion and electron travel length. However, extended contact area of nano-sized oxides with electrolyte causes undesirable side reactions and poor cycling stability. Interestingly, previous studies focus either on preparation of nano-sized oxides or on carbon coating to prevent side reactions. In this study, a microspherical composite of ethylene glycol-derived in situ carbon-coated Li4Ti5O12 nanoparticles and reduced graphene oxide is prepared by polyol-mediated spray drying method using ethylene glycol as a stabilizer to control particle growth and ethylene glycol coordinated with Ti precursor as a carbon source. The composite shows excellent rate capability as anode materials for lithium-ion and sodium-ion batteries. Most importantly, the composite shows 94% capacity retention after 3000 cycles at 10 C for Li+ storage and 95% capacity retention after 1000 cycles at 5 C for Na+ storage at room temperature. At 60 degrees C, furthermore, composite shows 93% capacity retention after 1000 cycles for Li+ storage and 95% capacity retention after 500 cycles for Na+ storage at 10 C. The post-mortem analysis confirms that in situ carbon coating on Li4Ti5O12 effectively prevents direct contact of Li(4)Ti(5)O(12 )nanoparticles with electrolyte, thus, blocking side reactions and greatly improving cycling stability. English ELSEVIER SCIENCE SA HIGH ELECTROCHEMICAL PERFORMANCE ANATASE TIO2 NANOCRYSTALS ANODE MATERIALS TITANIUM GLYCOLATE PYRO-SYNTHESIS GRAPHENE NANOSHEETS FACILE SYNTHESIS SIZE-CONTROL NANOCOMPOSITE BATTERIES Polyol-mediated carbon-coated Li4Ti5O12 nanoparticle/graphene composites with long-term cycling stability for lithium and sodium ion storages Article 10.1016/j.cej.2019.123984 1 CHEMICAL ENGINEERING JOURNAL, v.385 CHEMICAL ENGINEERING JOURNAL 385 scie scopus 000507465200118 2-s2.0-85077017726 Engineering, Environmental Engineering, Chemical Engineering Article HIGH ELECTROCHEMICAL PERFORMANCE ANATASE TIO2 NANOCRYSTALS ANODE MATERIALS TITANIUM GLYCOLATE PYRO-SYNTHESIS GRAPHENE NANOSHEETS FACILE SYNTHESIS SIZE-CONTROL NANOCOMPOSITE BATTERIES Polyol-mediated spray-drying synthesis Ethylene glycol In situ carbon coating Long-term cycling stability High-rate capability Lithium-ion batteries and sodium-ion batteries