High‐Rate and Long‐Life Au Nanorods/LiFePO 4 Composite Cathode for Lithium‐Ion Batteries

Wang

ACS Appl. Mater. Interfaces

et al. 2022

A fluoride-ion battery (FIB) is a novel type of energy storage system that has a higher volumetric energy density and low cost. However, the high working temperature (>150 °C) and unsatisfactory cycling performance of cathode materials are not favorable for their practical application. Herein, fluoride ion-intercalated CoFe layered double hydroxide (LDH) (CoFe-F LDH) was prepared by a facile co-precipitation approach combined with ion-exchange. The CoFe-F LDH shows a reversible capacity of ∼50 mAh g–1 after 100 cycles at room temperature. Although there is still a big gap between FIBs and lithium-ion batteries, the CoFe-F LDH is superior to most cathode materials for FIBs. Another important advantage of CoFe-F LDH FIBs is that they can work at room temperature, which has been rarely achieved in previous reports. The superior performance stems from the unique topochemical transformation property and small volume change (∼0.82%) of LDH in electrochemical cycles. Such a tiny volume change makes LDH a zero-strain cathode material for FIBs. The 2D diffusion pathways and weak interaction between fluoride ions and host layers facilitate the de/intercalation of fluoride ions, accompanied by the chemical state changes of Co2+/Co3+ and Fe2+/Fe3+ couples. First-principles calculations also reveal a low F– diffusion barrier during the cyclic process. These findings expand the application field of LDH materials and propose a novel avenue for the designs of cathode materials toward room-temperature FIBs.

Section: Resultssupporting

confidence: 64%

A Zero-Strain Insertion Cathode Material for Room-Temperature Fluoride-Ion Batteries

Wang

ACS Appl. Mater. Interfaces

et al. 2022

“…This is mainly due to the unique structure of LFP/rGO-300 composite materials. As shown in Table S1, the Li-ion storage of the LFP/rGO-300 composite is better than or comparable to other LFP-based electrodes in previous literature reports [8,10,12,13,17,19,[54][55][56][57][58][59][60][61][62][63][64][65][66][67]. The layered rGO matrix and carbon coating ensure the high structural stability and electrical conductivity of the composite material.…”

Section: Resultsmentioning

confidence: 53%

Reduced Graphene Oxide Coating LiFePO4 Composite Cathodes for Advanced Lithium-Ion Battery Applications

Zhang,

Zhou,

Tong

et al. 2023

IJMS

Recently, the application of LiFePO4 (LFP) batteries in electric vehicles has attracted extensive attention from researchers. This work presents a composite of LFP particles trapped in reduced graphene oxide (rGO) nanosheets obtained through the high-temperature reduction strategy. The obtained LiFePO4/rGO composites indicate spherical morphology and uniform particles. As to the structure mode of the composite, LFP distributes in the interlayer structure of rGO, and the rGO evenly covers the surface of the particles. The LFP/rGO cathodes demonstrate a reversible specific capacity of 165 mA h g−1 and high coulombic efficiency at 0.2 C, excellent rate capacity (up to 10 C), outstanding long-term cycling stability (98%) after 1000 cycles at 5 C. The combined high electron conductivity of the layered rGO coating and uniform LFP particles contribute to the remarkable electrochemical performance of the LFP/rGO composite. The unique LFP/rGO cathode provides a potential application in high-power lithium-ion batteries.

“…LFP finds extensive applications in power systems, notably in automobiles, aerospace, power tools, and uninterruptible power supplies (UPS), where its exceptional stability, safety, and longevity make it highly desirable. However, LFP currently faces significant drawbacks, including poor batch reproducibility, low lithium ion diffusion coefficient, − and limited electrical conductivity. − …”

Section: Introductionmentioning

confidence: 99%

A Robust and Scalable N-Doped Carbon Coating Strategy for the High-Performance LiFePO₄ Cathode

Xu,

Feng,

et al. 2024

Ind. Eng. Chem. Res.

While the stable long-cycle performance of LiFePO 4 (LFP) cathodes holds significant promise for lithium-ion batteries (LiBs), their specific capacity and rate performance still fall short in market applications. In this study, we investigate surface modification of LFP using a cost-effective and highly conductive polyacrylonitrile (PAN)-induced carbon coating. Our findings indicate that 2 wt % of PAN can form a stable N−C layer on the surface of LFP particles, enhancing the Li + storage performance. Specifically, the initial discharge capacity reaches 153.9 mAh g −1 at 0.5 C, with LFP-2 maintaining 148.8 mAh g −1 after 150 cycles, significantly outperforming their counterparts LFP-0, LFP-1, and LFP-3. Under 1 C, the LFP-2 cathode exhibits an initial discharge specific capacity of 143.2 mAh g −1 and excellent cycle stability, retaining 84.32% of its capacity after 500 cycles. Additionally, LFP-2 demonstrates stable rate performance at 0.