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Temperature‐Dependent Nanopolyhedron Carbon‐Decorated Sb for High‐Performance Lithium‐Ion Batteries
Author(s) -
Han Qigang,
Zhang Xu,
Li Xiang,
Li Yao,
Zhang Wenqiang,
Sheng Yalan
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000767
Subject(s) - anode , materials science , nucleation , carbon fibers , lithium (medication) , pyrolysis , chemical engineering , electrochemistry , current density , composite number , ion , nanotechnology , composite material , electrode , chemistry , organic chemistry , medicine , physics , quantum mechanics , engineering , endocrinology
On the basis of its high theoretical capacity (660 mAh ⋅ g −1 ) and flat voltage platform, Sb has been considered as a potential anode material for lithium‐ion batteries. However, the large volume changes during the charge/discharge process result in a poor cycling stability and a terrible rate capability, which hinder the further practical application. Herein, metal organic frameworks derived from carbon can be endowed with tunable morphology by pyrolysis of the Sb 2 O 3 @ZIF‐8 precursor at different temperatures. Temperature‐dependent carbon matrixes with nano polyhedron are more profitable to relive the volume expansion by heterogeneous nucleation and growth on the surface of Sb. The as‐prepared Sb@C composite can deliver a high reversible capacity of 598.6 mAh ⋅ g −1 at a current density of 100 mA ⋅ g −1 after 100 cycles, which accounts for 91 % of the theoretical capacity of bare Sb. In addition, a reversible capacity of 223 mAh ⋅ g −1 can be maintained even at a current density of 2000 mA ⋅ g −1 . The excellent electrochemical characteristics of the Sb@C composites can be attributed to the synergistic effects between Sb and the external carbon matrixes.