Characteristics of lithium iron phosphate mixed with nano-sized acetylene black for rechargeable lithium-ion batteries

Abstract

Lithium iron phosphate mixed with nano-sized acetylene black (LiFePO 4 -AB) was synthesized by a hydrothermal method and subsequent high-energy ball-milling process. Different contents of AB were added to improve the electronic conductivity of LiFePO 4 . The structural and morphological performance of LiFePO 4 -AB was investigated by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscope, and high-resolution transmission electron microscope. LiFePO 4 -AB/Li batteries were fabricated in an argon-filled glove box, and their electrochemical performance was analyzed by cyclic voltammetry and charge/discharge tests. The XRD results demonstrate that LiFePO 4 -AB has an olivine-type structure indexed to the orthorhombic Pnma space group. LiFePO 4 -AB/Li battery with 10 wt% AB shows the best high-rate discharge properties with the discharge capacities of 116 mAh g -1 at 1 C and 85 mAh g -1 at 10 C at room temperature.

Impact of separator's solid‐phase ion conductivity parameter on convection battery performance and modeling

“…The modeled voltage behavior summarized by Figure is consistent with the experimental findings of Sun et al as well as the findings of this study.…”

“…The optimal fit was based on both the voltage profile (after 300 s) and the total mA-h capacity realized until reaching the lower cutoff voltage. The modeled voltage behavior summarized by Figure 4 is consistent with the experimental findings of Sun et al 18 as well as the findings of this study.…”

Understanding and recent development of carbon coating on LiFePO4cathode materials for lithium-ion batteries

“…13 Nanosize pristine LiFePO 4 has been synthesized by hydrothermal reaction under mild conditions, which indeed shows desirable electrochemical properties when the nanoparticles are well connected with the current collectors by using a large amount of carbon particle additives. [33][34][35] The carbon particles play the role of forming a conductive network in the cathode coating to improve the electron transport.…”

A comparative investigation of carbon black (Super-P) and vapor-grown carbon fibers (VGCFs) as conductive additives for lithium-ion battery cathodes

“…This can be achieved in two ways: (1) by controlling the physical properties of the electrodes, such as the density and thickness and (2) by using conductive additives. [15][16][17][18][19][20][21][22][23][24][25][26] Constructing a well-distributed conductive network that connects each active material particle is a highly important approach to overcoming the inherent limits in the performance of the active materials; even more so when the electrode composites become thicker. 24 A range of carbon materials such as amorphous carbon, carbon nanotubes (CNTs), graphene, vapor-grown carbon bers (VGCFs), and carbon black (Super-P) have been studied as conductive additives, [15][16][17]19,23,25,27,28 among which, the well-distributed network-like carbon bers such as CNTs and VGCFs help reduce the electron conducting resistance.…”