LiFePO4/carbon nanowires with 3D nano-network structure as potential high performance cathode for lithium ion batteries

Abstract

, LiFePO4/carbon nanowires with 3D nano-network structure as potential high performance cathode for lithium ion batteries, Electrochimica Acta http://dx.doi.org/10. 1016/j.electacta.2016.01.019 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights  LiFePO4/C nanowires with 3D nano-network structure have been successfully synthesized via a facile and controllable induced evaporative self-assembly method. Amylose with a unique spiral structure and short branched chains, not only acts as carbon source, but also play a significant role on inducing the self-assembly of the precursors' ions confined along core axis of spiral structural amylose. LiFePO4/C nanowires are connected to a three-dimensional nano-network structure by the amorphous carbon pyrolyzed from the short branched chains of amyloses. LiFePO4/C nanowires deliver high capacity of 167 at 0.1 C and capacity retention of 92.8 % (128 mA h g -1 ) after 100 cycles at 50 C rate. AbstractLiFePO4/carbon nanowires with three-dimensional (3D) nano-network structure were successfully synthesized via evaporative self-assembly method induced by amylose. The morphologies and structures are investigated by X-ray diffractometer, scanning electron microscope and transmission electron microscope. The co-axis one-dimensional LiFePO4/C nanowires, which are 50 nm in diameter and between 400 nm and 1 μm in length, are tightly connected into 3D nano-network structure by the amorphous carbon from the short branched chains of amylase. They deliver high capacities of 167 and 138 mA h g -1 at 0.1 C and 50 C respectively. After 100 cycles at 50 C rate, the capacity retention of the composite can still maintain 92.8% (128 mA h g -1 ).The unique 3D nano-network structure can effectively increase the contact between active materials and electrolyte, and improve the poor electronic and ionic conductivity.

Sustainable and facile synthesis of high-performance nitrogen-doped carbon/graphene@LiFePO4 cathode materials from spent LiFePO4

“…43 In addition to LiFePO 4 peaks, other weak peaks of impurities (such as FePO 4 and P 2 O 5 ) were also observed in S-LPF, which may have resulted from the breakdown of partial LiFePO 4 particles following many charge/discharge cycles. 44,45 Loss of lithium and the presence of FePO 4 are in accordance with LFP's fading mechanism. 15 The N-DC@LPF as well as N-DC/G@LPF cathode materials were regenerated after calcination in Ar (Fig.…”

Recent progress of surface coating on cathode materials for high-performance lithium-ion batteries

“…In particular, the low cost and eco-friendliness of carbon materials have advantages for large-scale commercial production. Common carbon coating materials include porous carbon [138] , carbon nanowires [139] , graphene [140] and carbon nanotubes [141] .…”

Structure Design and Composition Engineering of Carbon‐Based Nanomaterials for Lithium Energy Storage

“…These 3D structures smooth migration of Li + and electrons around the embedded LiFePO 4 , improving rate capability and cycle stability. For example, Bai et al encapsulated LiFePO 4 into 3D carbon nanowires network as the cathode for LIBs via an evaporative self‐assembly method . The 3D conductive network connections attributed to a low electrode polarization and outstanding cycling performance.…”