Capacity fade of LiFePO4/graphite cell at elevated temperature

Song, Haishen; Cao, Zheng; Chen, Xiong; Lu, Hai; Wang, Tingyun; Zhang, Zhian; Lai, Yanqing; Li, Jie; Liu, Yexiang

doi:10.1007/s10008-012-1893-2

Cited by 66 publications

(34 citation statements)

References 14 publications

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“…[3,[5][6][7][8][9][10][11] Among these candidates, Graphite-LiFeO 4 is one of the most widely used systems of commercial LIBs, owing to its superb safety feature and prolonged cycle life. [12][13][14] The long-term failure and degradation mechanism of the Graphite-LiFeO 4 batteries are mainly due to the degradation of the graphite anode, although the detailed mechanisms have not been fully identified. To be noted, understanding the degradation mechanisms of LIBs is beneficial to address the life time and safety challenges, to make precise lifetime predictions, and to improve the battery performance.…”

Section: Introductionmentioning

confidence: 99%

Understanding the crack formation of graphite particles in cycled commercial lithium-ion batteries by focused ion beam - scanning electron microscopy

Lin

Jia

Wang

et al. 2017

Journal of Power Sources

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The structure degradation of commercial Lithium-ion battery (LIB) graphite anodes with different cycling numbers and charge rates was investigated by focused ion beam (FIB) and scanning electron microscopy (SEM). The cross-section image of graphite anode by FIB milling shows that cracks, resulted in the volume expansion of graphite electrode during long-term cycling, were formed in parallel with the current collector. The crack occurs in the bulk of graphite particles near the lithium insertion surface, which might derive from the stress induced during lithiation and de-lithiation cycles. Subsequently, crack takes place along grain boundaries of the polycrystalline graphite, but only in the direction parallel with the current collector. Furthermore, fast charge graphite electrodes are more prone to form cracks since the tensile strength of graphite is more likely to be surpassed at higher charge rates. Therefore, for LIBs long-term or high charge rate applications, the tensile strength of graphite anode should be taken into account.

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Section: Introductionmentioning

confidence: 99%

Understanding the crack formation of graphite particles in cycled commercial lithium-ion batteries by focused ion beam - scanning electron microscopy

Lin

Jia

Wang

et al. 2017

Journal of Power Sources

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“…According to many research results [19][20][21][22][23][24], it was clearly indicated that the HF generated from the LiPF 6 electrolyte was responsible for the dissolution of Fe during cycling. The uncoated LFP/C cathode material in the LiPF 6 electrolyte reacted with the HF and thus led to a gradual capacity loss.…”

Section: Resultsmentioning

confidence: 97%

“…It is well accepted [19][20][21][22][23][24] that the high concentration Fe 2+ dissolving from LFP/C material at elevated temperature is one of the main reasons for the occurrence of a capacity-fading mechanism. According to many research results [19][20][21][22][23][24], it was clearly indicated that the HF generated from the LiPF 6 electrolyte was responsible for the dissolution of Fe during cycling.…”

Section: Resultsmentioning

confidence: 99%

“…The lithium chemical diffusion coefficients (D i ) of the electrode were calculated based on Eq. (1) [19][20][21][22][23][24]:…”

Section: Resultsmentioning

confidence: 99%

“…A spray dry (SP) method has been widely used to prepare spherical LiFePO 4 /C cathode materials to enhance the electrochemical performance [15][16][17][18][19]. The low-and high-temperature performance and capacity fading mechanism of LiFePO 4 /C materials have recently been intensively explored [20][21][22][23][24]. Surface coating is an effective method of solving the problems of high-temperature metal dissolution and cycling deterioration.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of electrochemical performances of lithium titanium oxide–coated LiFePO4/C cathode composite at low and high temperatures

2016

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Capacity Fade Analysis of the Lithium‐Ion Power Battery Cycling Process Based on an Electrochemical‐Thermal Coupling Model

Tang

Ai²,

Yin³

et al. 2015

Energy Tech

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An electrochemical‐thermal model is developed to simulate the capacity fade of a lithium‐ion battery. Capacity fade is based on the loss of active lithium ions and the solid electrolyte interface (SEI) increase in an anode film caused by solvent reduction at the anode–electrolyte interface. This model incorporates a solvent reduction reaction at the anode. The reliability of the model is verified in terms of electrochemical properties, thermal properties, and capacity fade. Quantitative analysis is conducted to study the evolution of the distribution of the side‐reaction rate in the electrode thickness direction with the charging time. Moreover, the effect of temperature change on the current density of side‐reactions is also considered. The results indicate that during high‐rate charge and discharge cycles, the temperature of a lithium‐ion power battery increases significantly, and the temperature effect improves the accuracy of the model prediction.

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Capacity fade of LiFePO4/graphite cell at elevated temperature

Cited by 66 publications

References 14 publications

Understanding the crack formation of graphite particles in cycled commercial lithium-ion batteries by focused ion beam - scanning electron microscopy

Understanding the crack formation of graphite particles in cycled commercial lithium-ion batteries by focused ion beam - scanning electron microscopy

Study of electrochemical performances of lithium titanium oxide–coated LiFePO4/C cathode composite at low and high temperatures

Capacity Fade Analysis of the Lithium‐Ion Power Battery Cycling Process Based on an Electrochemical‐Thermal Coupling Model

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