Deterioration of lithium iron phosphate/graphite power batteries under high-rate discharge cycling

Zheng, Yong; He, Yan‐Bing; Qian, Kun; Li, Baohua; Wang, Xindong; Li, Jianling; Chiang, Sum Wai; Cui, Miao; Kang, Feiyu; Zhang, Jianbo

doi:10.1016/j.electacta.2015.06.096

Cited by 63 publications

(30 citation statements)

References 38 publications

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“…In the particular case of batteries, EIS provides information about the kinetic and mass transport properties of the cells and allows the relation of these electrical measurements to the physical processes. One of the advantages of EIS is that the measured effects can be easily translated into equivalent electrical circuits, which are commonly based on combinations of resistive, capacitive, and inductive elements along with constant phase elements (CPEs) [20][21][22][23][24]. In the literature, it is common to find the evolution of the resistive parts with state-of-charge (SoC) [9,18,22,25,26] but less information is available about the evolution of capacitance or characteristic frequency [20,26].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the impedance of a cell is influenced by the contributions of both positive and negative electrodes and it is not straightforward to determine which electrode is causing each of the physical processes. In the literature, two different approaches are commonly considered to overcome this: on the one hand, cells are disassembled and half-cells or symmetrical cells are built and tested [7,[16][17][18]24,25], on the other hand, full cells are directly measured but in a three-electrode configuration by adding a reference electrode [10,[29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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Impedance Characterization of an LCO-NMC/Graphite Cell: Ohmic Conduction, SEI Transport and Charge-Transfer Phenomenon

Ovejas

Cuadras

2018

Batteries

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Currently, Li-ion cells are the preferred candidates as energy sources for existing portable applications and for those being developed. Thus, a proper characterization of Li-ion cells is required to optimize their use and their manufacturing process. In this study, the transport phenomena and electrochemical processes taking place in LiCoO2-Li(NiMnCo)O2/graphite (LCO-NMC/graphite) cells are identified from half-cell measurements by means of impedance spectroscopy. The results are calculated from current densities, instead of absolute values, for the future comparison of this data with other cells. In particular, impedance spectra are fitted to simple electrical models composed of an inductive part, serial resistance, and various RQ networks—the parallel combination of a resistor and a constant phase element—depending on the cell. Thus, the evolution of resistances, capacitances, and the characteristic frequencies of the various effects are tracked with the state-of-charge (SoC) at two aging levels. Concretely, two effects are identified at the impedance spectrum; one is clearly caused by the charge transfer at the positive electrode, whereas the other one is presumably caused by the transport of lithium ions across the solid electrolyte interphase (SEI) layer. Moreover, as the cells age, the characteristic frequency of the charge transfer is drastically reduced by a factor of around 70%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impedance Characterization of an LCO-NMC/Graphite Cell: Ohmic Conduction, SEI Transport and Charge-Transfer Phenomenon

Ovejas

Cuadras

2018

Batteries

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“…To improve the stabilization and performance of SEI films at elevated temperatures, vinylene carbonate (VC) as a successful electrolyte additive has been widely used for 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 3 graphite anodes of cells [23][24][25][26][27]. VC is proved to be an effective SEI-forming additive in EC/PC based electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Effect of vinylene carbonate on electrochemical performance and surface chemistry of hard carbon electrodes in lithium ion cells operated at different temperatures

Xiang

Fan

Xiao

et al. 2016

Electrochimica Acta

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Due to wide uses of lithium ion batteries and emerging researches on sodium ion batteries, hard carbon (HC) as an anode material comes into sights of research fellows recently. HC anode delivers a considerable reversible capacity at room temperature and increasing capacities at elevated temperatures. However, the electrolyte and solid electrolyte interphase (SEI) formed on the electrode surface tend to become instable at elevated temperatures, though the appreciable reservoir ability of HC is alluring. Herein, we report that vinylene carbonate (VC) is a desirable electrolyte additive for HC electrodes especially at elevated temperatures. The influence of VC on electrochemical performance and surface chemistry of HC electrodes at both 25 °C and 50 °C is investigated in detail using Cyclic voltammograms (CVs), electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). In the presence of VC additive, a stable SEI film is formed upon cycling, which contains increased amounts of Li 2 CO 3 and decreased F species contents. It demonstrates that the SEI formed in the presence of VC helps suppress salt anion (PF 6 -) decomposition as well as SEI transformation occurred at 50 °C.

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“…Depending on the application, an optimal crystal size may exist, where performance may even decline if the crystal is made too small. While the above asserts that inactive layer formation may have a negative effect on capacity for nanoparticles, it is well documented that SEIs (a type of surface layer) have an important role in improving stability, cyclability, rate capability, and safety in lithium ion batteries [13,14,[30][31][32][33][34][35].…”

Section: Resultsmentioning

confidence: 99%

Galvanostatic interruption of lithium insertion into magnetite: Evidence of surface layer formation

Brady

Knehr

Cama

et al. 2016

Journal of Power Sources

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Magnetite is a known lithium intercalation material, and the loss of active, nanocrystalline magnetite can be inferred from the open-circuit potential relaxation. Specifically, for current interruption after relatively small amounts of lithium insertion, the potential first increases and then decreases, and the decrease is hypothesized to be due to a formation of a surface layer, which increases the solid-state lithium concentration in the remaining active material. Comparisons of simulation to experiment suggest that the reactions with the electrolyte result in the formation of a thin layer of electrochemically inactive material, which is best described by a nucleation and growth mechanism. Simulations are consistent with experimental results observed for 6, 8 and 32-nm crystals. Furthermore, simulations capture the experimental differences in lithiation behavior between the first and second cycles.

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Deterioration of lithium iron phosphate/graphite power batteries under high-rate discharge cycling

Cited by 63 publications

References 38 publications

Impedance Characterization of an LCO-NMC/Graphite Cell: Ohmic Conduction, SEI Transport and Charge-Transfer Phenomenon

Impedance Characterization of an LCO-NMC/Graphite Cell: Ohmic Conduction, SEI Transport and Charge-Transfer Phenomenon

Effect of vinylene carbonate on electrochemical performance and surface chemistry of hard carbon electrodes in lithium ion cells operated at different temperatures

Galvanostatic interruption of lithium insertion into magnetite: Evidence of surface layer formation

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