First fluorescent probe for graphite anodes of lithium-ion battery

Wang, Mengshi; Song, Yaqin; Wei, Wenjuan; Liang, Hong; Yi, Yanyan; Wang, Xiaolin; Ren, Dongsheng; Wang, Li; Wang, Jianlong; Wei, Yen; He, Xiangming; Yang, Yang

doi:10.1016/j.matt.2022.12.014

Cited by 14 publications

(5 citation statements)

References 42 publications

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“…[ 22,25 ] For batteries where operando or in situ characterizations are difficult to carry out, the electrode state can be identified after disassembling the batteries using ex situ techniques such as ex situ XRD, TEM, fluorescence probe, etc. [ 23,26 ]…”

Section: Discussionmentioning

confidence: 99%

Operando X‐Ray Diffraction Boosting Understanding of Graphite Phase Evolution in Lithium‐Ion Batteries

Wang,

Gao,

Liu

et al. 2023

Small Methods

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The fast charging/discharging performance of lithium‐ion batteries is closely related to the properties of electrode materials, especially the phase evolution and Li+ diffusion kinetics. The phase evolution and intrinsic properties of an electrode material under different C‐rates can be investigated by applying operando X‐ray diffraction (XRD). In this study, a transmission X‐ray diffractometer is used in operando monitoring the behaviors of NCM811/Graphite pouch cells during charging/discharging at low rate (0.1C) and high rate (2.5C), especially the structure changes, phase evolution, and relaxation of graphite anode. The variations in XRD patterns, as well as and the inconsistency between the state of charge (SOC) of full cells and the SOC of electrodes, are explained based on genetic algorithm and shrinking annuli model. Furthermore, from the perspectives of monitoring and identification of electrode state, structural design of materials and electrodes, and optimization of charging/discharging protocols, practical suggestions for understanding the state and improving the performance of electrodes are proposed.

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Section: Discussionmentioning

confidence: 99%

Operando X‐Ray Diffraction Boosting Understanding of Graphite Phase Evolution in Lithium‐Ion Batteries

Wang,

Gao,

Liu

et al. 2023

Small Methods

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“…They are now widely employed in portable electronics and electric vehicles 1–3 . Graphite currently dominates the market for commercial LIBs with its abundant reserves and excellent electrochemical properties 4,5 . And their increasing demand is estimated to generate more than 1.16 million tons of spent LIBs by 2023, leading to many LIBs falling into end‐of‐life, recycling, and reuse 6,7 .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Graphite currently dominates the market for commercial LIBs with its abundant reserves and excellent electrochemical properties. 4,5 And their increasing demand is estimated to generate more than 1.16 million tons of spent LIBs by 2023, leading to many LIBs falling into end-of-life, recycling, and reuse. 6,7 Decommissioned LIBs contain large amounts of hazardous substances, which pose severe environmental safety issues and human health risks.…”

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confidence: 99%

Regeneration of graphite from spent lithium‐ion batteries as anode materials through stepwise purification and mild temperature restoration

Ji,

Zhang,

Hua

et al. 2024

Battery Energy

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Graphite is one of the most widely used anode materials in lithium‐ion batteries (LIBs). The recycling of spent graphite (SG) from spent LIBs has attracted less attention due to its limited value, complicated contaminations, and unrestored structure. In this study, a remediation and regeneration process with combined hydrothermal calcination was proposed to remove different impurities as value‐added resources from SG. This study focuses on the application of different removal methods for different impurity metals by hydrothermal and acid leaching under different conditions for the removal of Cu, Li, Co, Mn, and Ni from SG. Then, mild‐tempreture calcination of SG was performed to remove residual organic compounds. The regenerated graphite (RG) was found to have a better morphology structure and increased pore volume, which is more favorable for the embedding and desorption of lithium (Li) in graphite. In terms of electrochemical performance, the first discharge‐specific capacity of RG at 0.5 C is 359.40 mAh/g, with a retention of 353.49 mAh/g after 100 cycles (retention rate of 98.36%). This study can be a green and efficient candidate for the regeneration of graphite from spent lithium‐ion batteries as anode material by reduced restoration temperature, with different metal resources as by‐products.

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“…According to the intrinsic fluorescence signal of AIE fluorescent tracer, [37,38] it is accessible to directly observe and quantitate the distribution, relative abundance, and macro morphology of the SEI. In our previous works, [39,40] we had successfully developed the AIE (a solid-state fluorescence phenomenon) fluorescent probe to visualize and characterize the interfaces of lithium anodes or graphite anodes. But above fluorescent probe were exogenous probes that did not participate in the charge/discharge cycles.…”

Section: Introductionmentioning

confidence: 99%

Can We See SEI Directly by Naked Eyes?

Wang,

Liang,

Wang

et al. 2023

Advanced Materials

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Stable solid electrolyte interface (SEI) is the key to improve the electrochemical performance of lithium metal batteries. However, there are still many puzzles about SEI film that have not been well explained, due to the complexity of electrochemical reactions involving in SEI formation and the absence of direct observation methods for SEI. Here we realize the direct observation of SEI by skillfully designed fluorescent tracers acting as an SEI film‐forming additive for electrolytes. These fluorescent tracers have three important moieties: an olefin group for polymerization on anode surface so as to participate in SEI film formation during charge/discharge cycles, a polar group for Li‐ion conduction, and an AIEgen for fluorescent tracing. Therefore, the tracers participate in SEI film‐forming and result in a shining SEI film. This shining SEI film with intrinsic fluorescence signal allows direct observation and quantification on the distribution, relative abundance, and macro morphology of SEI. These fluorescent tracers can also reveal the SEI formation‐growth‐destruction regularity during charge/discharge cycles. Several summarized typical macro morphologies and evolution stages of SEI would enrich our knowledge and understanding of SEI, and help us to gain insight into the interaction between electrolyte and anode, electrochemical performance and cycle life of batteries.This article is protected by copyright. All rights reserved

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First fluorescent probe for graphite anodes of lithium-ion battery

Cited by 14 publications

References 42 publications

Operando X‐Ray Diffraction Boosting Understanding of Graphite Phase Evolution in Lithium‐Ion Batteries

Operando X‐Ray Diffraction Boosting Understanding of Graphite Phase Evolution in Lithium‐Ion Batteries

Regeneration of graphite from spent lithium‐ion batteries as anode materials through stepwise purification and mild temperature restoration

Can We See SEI Directly by Naked Eyes?

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