Voltage fade mitigation in the cationic dominant lithium-rich NCM cathode

Chandan, Prem; Chang, Chung-Chieh; Yeh, K. C.; Chiu, Chui-Chang; Dongze, Wu; Huang, Tzu-Wen; Wu, Phillip M.; Chi, Po‐Wei; Hsu, Wei-Fan; Su, Kai-Han; Lee, Yu-Wen; Chang, Hua-Shu; Wang, Ming-Jye; Wu, Heng‐Liang; Tang, Hung-Jie; Wu, Maw–Kuen

doi:10.1038/s42004-019-0223-3

Cited by 15 publications

(11 citation statements)

References 36 publications

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“…Initial gels have longer mesh links while mature gels exhibit submicron mesh sizes ( 12 ). Detailed characterizations of pectin’s optical, magnetic, and electrochemical properties, both the pristine and Fe-doped materials ( 11–14 , 21–23 ), are investigated for lithium batteries performance.…”

Section: Introductionmentioning

confidence: 99%

Vibrational and electrochemical studies of pectin—a candidate towards environmental friendly lithium-ion battery development

Chung

Chen

et al. 2022

PNAS Nexus

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Pectin polymers are considered for lithium ion battery electrodes. To understand the performance of pectin as an applied buffer layer, the electrical, magnetic and optical properties of pectin films are investigated. This work describes a methodology for creating pectin films, including both pristine pectin and Fe-doped pectin, which are optically translucent, and explores their potential for lithium-ion battery application. The transmission response is found extended in optimally Fe doped pectin, and prominent modes for cation bonding are identified. Fe doping enhances the conductivity observed in electrochemical impedance spectroscopy (EIS), and from the magnetic response of pectin evidence for Fe3+ is identified. The Li-ion half-cell prepared with pectin as binder for anode materials such as graphite shows stable charge capacity over long cycle life, and with slightly higher specific capacity compare with the cell prepared using PVDF as binder. A novel enhanced charging specific capacity at high C-rate is observed in cells with pectin binder suggesting within a certain rate (∼5C) pectin has higher capacity at faster charge rates. The pectin system is found as a viable base material for organic-inorganic synthesis studies.

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Section: Introductionmentioning

confidence: 99%

Vibrational and electrochemical studies of pectin—a candidate towards environmental friendly lithium-ion battery development

Chung

Chen

et al. 2022

PNAS Nexus

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“…Electrochemical impedance spectroscopy (EIS) is useful to separate contributions of different electrochemical phenomena related to polarization losses, basic ion transport and kinetic parameters of various electrochemical cells, and batteries 1 – 6 . EIS is often analyzed with complex non-linear least squares fit, which is computed by equivalent circuit modelling.…”

Section: Introductionmentioning

confidence: 99%

Computation of distribution of relaxation times by Tikhonov regularization for Li ion batteries: usage of L-curve method

Paul

et al. 2021

Sci Rep

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In this paper, the distribution of relaxation times (DRTs) functions are calculated numerically in Matlab for synthetic impedance data from single parallel $$RC$$ RC circuit and two parallel $$RC$$ RC circuits connected in series, experimental impedance data from supercapacitors and α-LiFeO2 anode based Li ion batteries. The quality of the impedance data is checked with the Kramers–Krönig (KK) relations. The DRTs are calculated within the KK compatible regime for all the systems using Tikhonov regularization (TR) method. Here we use a fast and simple L-curve method to estimate the TR parameter (λ) for regularization of the Fredholm integral equations of first kind in impedance. Estimation of the regularization parameters are performed effectively from the offset of the global corner of the L-curve rather than simply using the global corner. The physical significances of DRT peaks are also discussed by calculating the effective resistances and capacitances coupled with peak fitting program. For instance, two peaks in the DRTs justify the electrical double layer capacitance and ion diffusion phenomena for supercapacitors in low to intermediate frequencies respectively. Moreover, the surface film effect, Li/electrolyte and electrode/electrolyte charge transfer related processes are identified for α-LiFeO2 anode based Li-ion batteries. This estimation of the offset of the global corner extends the L-curve approach coupled with the Tikhonov regularization in the field of electrochemistry and can also be applied in similar process detection methods.

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“…Particular attention has been attracted to Li-rich layered metal oxides with the general formula x Li 4/3 Mn 4+ 2/3 O 2 + (1 – x )LiMO 2 (M = y Ni 2+ 1/2 Mn 4+ 1/2 + (1 – y )Co 3+ ), further referred to as Li-rich NMC, obtained by partial substitution of transition metals (TMs) with lithium. , These materials are capable of delivering a reversible capacity up to 280 mAh/g at an average discharge potential above 3.5 V versus Li + /Li and low cycling rates (<0.2 C), substantially surpassing widely used NMC and NCA cathode materials. However, Li-rich NMCs possess a number of serious drawbacks preventing their industrial deployment: (1) large voltage hysteresis, − (2) rapid voltage fade, , and (3) poor rate capability. , …”

Section: Introductionmentioning

confidence: 99%

“…3,4 These materials are capable of delivering a reversible capacity up to 280 mAh/g at an average discharge potential above 3.5 V versus Li + /Li and low cycling rates (<0.2 C), substantially surpassing widely used NMC and NCA cathode materials. However, Li-rich NMCs possess a number of serious drawbacks preventing their industrial deployment: (1) large voltage hysteresis, 5−7 (2) rapid voltage fade, 8,9 and (3) poor rate capability. 5,10 The first charge of Li-rich NMCs typically proceeds through two sloped plateaus centered at ∼4.1 and ∼4.5 V versus Li + /Li.…”

Section: ■ Introductionmentioning

confidence: 99%

Cycling-Driven Electrochemical Activation of Li-Rich NMC Positive Electrodes for Li-Ion Batteries

Luchkin

Kirsanova

Aksyonov

et al. 2022

ACS Appl. Energy Mater.

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For over a decade, Li-rich layered metal oxides have been intensively investigated as promising positive electrode materials for Li-ion batteries. Despite substantial progress in understanding of their electrochemical properties and (de)intercalation mechanisms, certain aspects of their chemical and structural transformations still remain unclear. In this work, we investigated the so-called cycling-driven electrochemical activation, which manifests itself as a gradual increase of reversible capacity upon cycling when the Li-to-transition metal atomic ratio exceeds 1.5 in the Li(Li x Mn1–x–y–z Ni y Co z )O2 formula. We found that initially, transition metals in this material are in high oxidation states and cannot be further oxidized during charge, which explains low initial capacity. The cycling-driven activation process proceeds through partial O2–/n– oxidation on charge, followed by reduction of oxygen and transition metals on discharge. The activated area gradually advances from the surface to the center of secondary Li-rich NMC particles through evolution of a core–shell structure. In this model, the slow anionic redox is a rate-limiting step, which also explains substantial dependence of the cycling-driven electrochemical activation on cycling rate.

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Voltage fade mitigation in the cationic dominant lithium-rich NCM cathode

Cited by 15 publications

References 36 publications

Vibrational and electrochemical studies of pectin—a candidate towards environmental friendly lithium-ion battery development

Vibrational and electrochemical studies of pectin—a candidate towards environmental friendly lithium-ion battery development

Computation of distribution of relaxation times by Tikhonov regularization for Li ion batteries: usage of L-curve method

Cycling-Driven Electrochemical Activation of Li-Rich NMC Positive Electrodes for Li-Ion Batteries

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