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

Mingxuan Guo,Haibo Li

doi:10.3389/fenrg.2021.781008

Abstract

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 m2 g−1). 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−1 after 100 cycles at 100 mA g−1, while it is 312.5 mAh g−1 for pure Mil-88B(Fe). Furthermore, the kinetic analysis on i=avb 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−1, respectively, demonstrating a capacitance-dominated charge storage process at fast charging rates.

Highlights

With the increasing popularity of portable electronic products and grid energy storage systems, the lithium ion battery (LIB) with high energy density and power density is of great importance (Du et al, 2020; Wei et al, 2020; Zhang et al, 2021a; Chang et al, 2021)
The metal–organic frameworks (MOFs), a self-assembled organic–inorganic hybrid (Yang et al, 2018; Wang et al, 2019a; Wang et al, 2019b), are regarded as promising materials that are applied in the domains of catalysis (Rao and Mandal, 2019; Wang et al, 2020), energy storage (Xu et al, 2018a; Dou et al, 2019), and gas storage (Xu et al, 2018b) due to high chemical stability (Chen et al, 2015), huge specific surface areas (Luo et al, 2016), controllable structure (Hu et al, 2021), and abundant resource (Du et al, 2011)
The b-value is 0.888 for the H-Mil-88B(Fe) electrode, demonstrating that the majority charge storage process is relating to capacitive characteristics (Ma et al, 2013; Shen et al, 2018), The total capacitive contribution to the current response can be calculated by Eq 2

Summary

INTRODUCTION

With the increasing popularity of portable electronic products and grid energy storage systems, the LIB with high energy density and power density is of great importance (Du et al, 2020; Wei et al, 2020; Zhang et al, 2021a; Chang et al, 2021). The low conductivity restricts the LIB performance of pure Mil-88B(Fe) electrode (Zhang et al, 2017). To solve this issue, Zhang et al synthesized Mil-53@ reduced graphene oxide composite for LIB anode. Zhang et al synthesized Mil-53@ reduced graphene oxide composite for LIB anode It exhibited high specific capacity of 550 mAh g−1 at 100 mA g−1 after 100 cycles. Shen et al developed a polyhedral nanorod structure, which was derived from Mil88B(Fe) for LIB anode It exhibited reversible capacity of 744.5 mAh g−1 at 60 mA g−1 after 400 cycles. The sediments were washed with DMF and ethanol It was collected by centrifugation at 8,000 rpm/min for 5 min, and dried at 80°C in a vacuum oven overnight. Where k1 and k2 are constants at a particular voltage, and the value of k1v represent the capacitance contribution

DISCUSSION

Findings

CONCLUSION

DATA AVAILABILITY STATEMENT