Thickness evolution of commercial Li-ion pouch cells with silicon-based composite anodes and NCA cathodes

Zhang, Xingyu; He, Jie; Zhou, Jiang; Chen, Haosen; Song, Wei‐Li; Fang, Daining

doi:10.1007/s11431-020-1709-y

Cited by 16 publications

(9 citation statements)

References 39 publications

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“…The results revealed the fact that the addition of 13 wt% SiO x into the Gr anode had a remarkable effect on cell thickness deformation behavior. [ 24 ] What breaks the conventional perception was that the maximum thickness of the cell emerged at the moment of being discharged to about 80% SOC.…”

Section: Resultsmentioning

confidence: 99%

Insight into the Electrochemical Behaviors of NCM811|SiO‐Gr Pouch Battery through Thickness Variation

Wang

Song

Cui

et al. 2023

Energy & Environ Materials

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LiNi0.8Co0.1Mn0.1O2 (NCM811) | SiOx‐graphite (SiO‐Gr.) battery chemistry is of intensive attention because its achievable practical energy density is approaching impressively 300 Wh Kg−1. However, it still suffers rapid capacity fades during repeated cycles, both chemical, electrochemical and mechanical irreversibility contribute. A comprehensive understanding behind the fading behavior of the cell chemistry is required before fully realize the benefits of this chemistry. Herein, the in‐situ thickness variation is introduced as a diagnostic technique and is performed on 5–55 Ah NCM811|SiO‐Gr cells. With the help of Li reference electrode and in‐situ X‐ray diffraction device, the correspondence between thickness variation and the electrode potential is carefully investigated. Firstly, the NCM811|SiO‐Gr cell is characterized with the maximum cell thickness at around 80% state‐of‐charge (SOC) in the discharge process, rather than at 100% SOC. Secondly, the electrochemical behaviors during rate charge/discharge are diagnosed, and a Li platting signal is resolved from thickness variation profile at 2C. This work confirms that the thickness monitoring is a nondestructive and informative complement to conventional diagnostic techniques for failure analysis of pouch cells.

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Section: Resultsmentioning

confidence: 99%

Insight into the Electrochemical Behaviors of NCM811|SiO‐Gr Pouch Battery through Thickness Variation

Wang

Song

Cui

et al. 2023

Energy & Environ Materials

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“…The specific capacity of NMC as cathode material is 160 mAh/g to 175 mAh/g [46]. The swelling and contraction of the cathode due to intercalation is typically at least 1 % to 3 % [47] and up to 4.5 % [48] of the initial volume, for NMC and NCA respectively. NMC cathodes are advantageous due to their enhanced specific capacity, thermal stability and the possibility to have different quantity shares of individual materials (x,y) [49].…”

Section: Cathodementioning

confidence: 99%

Methods for Quantifying Expansion in Lithium-Ion Battery Cells Resulting from Cycling: A Review

Krause,

Nusko,

Pitta Bauermann

et al. 2024

Preprint

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Significant efforts are being made across academia and industry to better characterize lithium-ion battery cells as reliance on the technology for applications ranging from green energy storage to electric mobility increases. The measurement of short-term and long-term volume expansion in lithium-ion battery cells is relevant for several reasons. For instance, it provides information about the quality and homogeneity of battery cells during charge and discharge cycles, as well as aging over it’s lifetime. The expansion measurements are useful for the evaluation of new materials and the improvement of end-of-line quality tests during cell production. These measurements may also indicate the safety of battery cells by aiding in predicting state of charge and state of health over the lifetime of the cell. Expansion measurements can also assess inhomogeneities on the electrodes and defects such as gas accumulation and lithium plating. In this review, we first establish the known mechanisms through which short term and long term volume expansion in lithium-ion battery cells occurs. We then explore the current state-of-the-art for both contact and non-contact measurements of volume expansion. This review compiles existing literature to outline the various options available to researchers aiming to make ex situ volume expansion measurements by doing post mortem analyses on individual components and in operando measurements on entire battery cells. Finally, we discuss the different considerations when selecting an appropriate measurement technique. The selection of the optimal method for measuring battery cell expansion depends on the objective of the characterization, duration, required resolution, and repeatability of results. Costs and required space for the measurement equipment are also considered.

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“…Furthermore, the maximum volume expansion of most commercial Li-ion pouch cells is >1%. [62][63][64][65] Therefore, our microfiber sensors can be applied to monitor the volume expansion of commercial Li-ion cells.…”

Section: Microfiber Strain Sensors In Battery Thickness Monitoringmentioning

confidence: 99%

Piezoresistive Free‐standing Microfiber Strain Sensor for High‐resolution Battery Thickness Monitoring

Nazari

Bäuerle

Zimmermann³

et al. 2023

Advanced Materials

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from green electric mobility to all sorts of daily-life personal electronic gadgets. Increasing the lifetime of the Li-ion battery is of utmost importance, not only to prohibit premature capacity fade but also to effectively reduce the hazardous waste stemming from these devices. During the battery operation, several inevitable electrochemical reactions occur between the electrodes and the electrolyte due to Li-ion de/intercalation. On the one hand, lattice expansion, and contractions during charging and discharging, known as breathing cause reversible volume expansion, in the long run leading to gradual structural aging. [1] On the other hand, parasitic reactions such as lithiumplating, gas generation, and solid electrolyte interphase growth, decrease capacity retention over time and cause irreversible expansions known as swelling, leading to lithium inventory loss. [2,3] These reactions, depending on the used electrode and electrolyte chemistry cause relative volume changes ranging from 1% up to 10%. [3] Thus, in a battery management system, real-time monitoring of the volume changes Highly sensitive microfiber strain sensors are promising for the detection of mechanical deformations in applications where limited space is available. In particular for in situ battery thickness monitoring where high resolution and low detection limit are key requirements. Herein, the realization of a highly sensitive strain sensor for in situ lithium-ion (Li-ion) battery thickness monitoring is presented. The compliant fiber-shaped sensor is fabricated by an upscalable wet-spinning method employing a composite of microspherical core-shell conductive particles embedded in an elastomer. The electrical resistance of the sensor changes under applied strain, exhibiting a high strain sensitivity and extremely low strain detection limit of 0.00005 with high durability of 10 000 cycles. To demonstrate the accuracy and ease of applicability of this sensor, the real-time thickness change of a Li-ion battery pouch cell is monitored during the charge and discharge cycles. This work introduces a promising approach with the least material complexity for soft microfiber strain gauges.

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Thickness evolution of commercial Li-ion pouch cells with silicon-based composite anodes and NCA cathodes

Cited by 16 publications

References 39 publications

Insight into the Electrochemical Behaviors of NCM811|SiO‐Gr Pouch Battery through Thickness Variation

Insight into the Electrochemical Behaviors of NCM811|SiO‐Gr Pouch Battery through Thickness Variation

Methods for Quantifying Expansion in Lithium-Ion Battery Cells Resulting from Cycling: A Review

Piezoresistive Free‐standing Microfiber Strain Sensor for High‐resolution Battery Thickness Monitoring

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