Devina, Winda Sarofil, Anith Dzhanxinah Mohd Chandra, Christian Park, Hyeon Seo Park, Jae -Ho Chung, Kyung Yoon Chang, Wonyoung Kim, Jaehoon 2024-01-19T09:30:24Z 2024-01-19T09:30:24Z 2023-08-17 2023-06 0169-4332 https://pubs.kist.re.kr/handle/201004/113623 Materials that undergo combined conversion and alloying reactions are promising as anodes for lithium storage application because they can accommodate multiple lithium ions. However, irreversible conversion reactions, large voltage hysteresis, poor rate capabilities, and low initial Coulombic efficiencies during continuous discharge-charge cycling make practical applications of conversion-alloying materials challenging. Herein, we present cobalt-bismuth oxide (CBO) nanoneedles, a new bimetallic material in which Li+-ion uptake proceeds stepwise, thus effectively suppressing volume expansion. During the initial lithiation stage, the CBO nanoneedles undergo a conversion reaction to form nanodomains of low-oxidation-state Co delta+ ( delta <= 2) in a Li2O matrix. At the next potential platform, the Bi phase attracts Li+ ions via an alloying reaction, while the Co delta+/Li2O phase hinders excessive volume expansion. Consequently, the CBO electrode delivers a high reversible discharge capacity of 392 mAh g(-1) at 50 mA g(-1) for up to 100 cycles. Further, an ultrastable long-term capacity of 300 mAh g(-1) at 250 mA g(-1) is realized over 1000 cycles. The stepwise lithiation process decreases volume expansion significantly (by similar to 10%), which leads to good cyclability. Owing to their ease of preparation and excellent performance characteristics, CBO nanoneedles are an attractive long-life anode material for lithium-ion batteries. English Elsevier BV Reversible conversion-alloying of cobalt-bismuth oxide nanoneedles for long-life lithium storage anodes Article 10.1016/j.apsusc.2023.157013 1 Applied Surface Science, v.623 Applied Surface Science 623 N scie scopus 001024419800001 2-s2.0-85150827478 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article REDUCED GRAPHENE OXIDE ION BATTERIES RATE CAPABILITY PERFORMANCE CO3O4 NANOTUBES METAL NANOMATERIALS NANOPARTICLE MICROSPHERES Bimetallic Cobalt oxide Bismuth Anode Lithium -ion battery