AUTHOR=Guo Mingxuan , Li Haibo 

TITLE=The Hydrolyzed Mil-88B(Fe) With Improved Surface Area for High-Capacity Lithium Ion Battery

JOURNAL=Frontiers in Energy Research

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.781008

DOI=10.3389/fenrg.2021.781008

ISSN=2296-598X

ABSTRACT=<p>In this work, Mil-88B(Fe) is modified by a facile hydrolysis method for high-performance lithium ion battery (LIB). The hydrolyzed Mil-88B(Fe) [H-Mil-88B(Fe)] heritages the spindle-like shape of Mil-88B(Fe) and forms a porous structure, which possesses relatively high specific surface area (427.86 m<sup>2</sup> g<sup>−1</sup>). It is 15 times higher than that of pristine Mil-88B(Fe). As anode for LIB, it reaches to high specific capacity of 600.1 mAh g<sup>−1</sup> after 100 cycles at 100 mA g<sup>−1</sup>, while it is 312.5 mAh g<sup>−1</sup> for pure Mil-88B(Fe). Furthermore, the kinetic analysis on <inline-formula id="inf1"><mml:math id="m1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>i</mml:mi><mml:mo>=</mml:mo><mml:mi>a</mml:mi><mml:msup><mml:mi>v</mml:mi><mml:mi>b</mml:mi></mml:msup></mml:mrow></mml:math></inline-formula> reveals that the b value of H-Mil-88B(Fe) is 0.888, which suggests the mixed contribution from the diffusion and capacity reactions. Furthermore, the capacitance contribution fractions of H-Mil-88B(Fe) are 47.6%, 53.28%, 56.88%, 74.68%, and 69.14% at the sweep rate of 0.2, 0.4, 0.6, 0.8, 1.0 mV s<sup>−1</sup>, respectively, demonstrating a capacitance-dominated charge storage process at fast charging rates.</p>