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Engineering Fe-N Coordination Structures for Fast Redox Conversion in Lithium-Sulfur Batteries.
Ma, Cheng; Zhang, Youquan; Feng, Yiming; Wang, Ning; Zhou, Liangjun; Liang, Chaoping; Chen, Libao; Lai, Yanqing; Ji, Xiaobo; Yan, Chenglin; Wei, Weifeng.
Afiliación
  • Ma C; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.
  • Zhang Y; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.
  • Feng Y; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.
  • Wang N; College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100124, China.
  • Zhou L; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.
  • Liang C; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.
  • Chen L; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.
  • Lai Y; School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China.
  • Ji X; College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China.
  • Yan C; Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006, China.
  • Wei W; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.
Adv Mater ; 33(30): e2100171, 2021 Jul.
Article en En | MEDLINE | ID: mdl-34145629
Critical drawbacks, including sluggish redox kinetics and undesirable shuttling of polysulfides (Li2 Sn , n = 4-8), seriously deteriorate the electrochemical performance of high-energy-density lithium-sulfur (Li-S) batteries. Herein, these challenges are addressed by constructing an integrated catalyst with dual active sites, where single-atom (SA)-Fe and polar Fe2 N are co-embedded in nitrogen-doped graphene (SA-Fe/Fe2 N@NG). The SA-Fe, with plane-symmetric Fe-4N coordination, and Fe2 N, with triangular pyramidal Fe-3N coordination, in this well-designed configuration exhibit synergistic adsorption of polysulfides and catalytic selectivity for Li2 Sn lithiation and Li2 S delithiation, respectively. These characteristics endow the SA-Fe/Fe2 N@NG-modified separator with an optimal polysulfides confinement-catalysis ability, thus accelerating the bidirectional liquid-solid conversion (Li2 Sn ↔Li2 S) and suppressing the shuttle effect. Consequently, a Li-S battery based on the SA-Fe/Fe2 N@NG separator achieves a high capacity retention of 84.1% over 500 cycles at 1 C (pure S cathode, S content: 70 wt%) and a high areal capacity of 5.02 mAh cm-2 at 0.1 C (SA-Fe/Fe2 N@NG-supported S cathode, S loading = 5 mg cm-2 ). It is expected that the outcomes of the present study will facilitate the design of high-efficiency catalysts for long-lasting Li-S batteries.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2021 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2021 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania