2022
DOI: 10.1021/acsnano.2c03922
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A Figure of Merit for Fast-Charging Li-ion Battery Materials

Abstract: Rate capability is characterized necessarily in almost all battery-related reports, while there is no universal metric for quantitative comparison. Here, we proposed the characteristic time of diffusion, which mainly combines the effects of diffusion coefficients and geometric sizes, as an easy-to-use figure of merit (FOM) to standardize the comparison of fast-charging battery materials. It offers an indicator to rank the rate capabilities of different battery materials and suggests two general methods to impr… Show more

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Cited by 59 publications
(35 citation statements)
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“…The galvanostatic intermittent titration technique (GITT) measurement showed the increased D Li + of S-NCM@5La compared with the pristine NCM0.83, indicating the enhanced diffusion capability which determines the kinetics of the charge/discharge process, thus achieving superior rate performance (Figure S11). 44,45 As the surface delithiation went deeper, and the Ni 2+ tended to dominate the surface, a much-deteriorated rate performance of the S-NCM@20La electrode was observed (Figure S12), reflecting not only the deleterious nature of the deep-delithiated structure in jeopardizing Li + transfer but also the essential role of lattice modulation to satisfy the need in both cyclability and rate capability. Electrochemical impedance spectroscopy (EIS) was then used to probe the cathode−electrolyte interface during the cycling (Figures 4g and S13).…”
Section: ■ Results and Discussionmentioning
confidence: 97%
“…The galvanostatic intermittent titration technique (GITT) measurement showed the increased D Li + of S-NCM@5La compared with the pristine NCM0.83, indicating the enhanced diffusion capability which determines the kinetics of the charge/discharge process, thus achieving superior rate performance (Figure S11). 44,45 As the surface delithiation went deeper, and the Ni 2+ tended to dominate the surface, a much-deteriorated rate performance of the S-NCM@20La electrode was observed (Figure S12), reflecting not only the deleterious nature of the deep-delithiated structure in jeopardizing Li + transfer but also the essential role of lattice modulation to satisfy the need in both cyclability and rate capability. Electrochemical impedance spectroscopy (EIS) was then used to probe the cathode−electrolyte interface during the cycling (Figures 4g and S13).…”
Section: ■ Results and Discussionmentioning
confidence: 97%
“…Given an external circuit connecting the two electrodes, electrons are transported from the anode to the cathode reversibly, and the electrolyte ions are transferred in the same direction to equalize the potential difference. 41 At a high charging rate, the amount of electrolyte ions shiing from cathode to anode increases per unit time in the chargetransfer process. 42 At the anode side, the restricted factors for fast charging are the formation of dendrites, generated side reactions, and sluggish ion diffusion or low conductivity.…”
Section: Influence Factors Of High-rate Performancementioning
confidence: 99%
“…Nanopores are pore gaps in the separator, which are formed by interweaving and overlapping countless fibers with diameters of micrometers or nanometers [56] . These pore gaps allow the migration of Li + during the charging and discharging process [57] . Porosity is defined as the ratio of the volume of micropores to the total volume of the separator [58] .…”
Section: General Requirements and Characterization Of Lib Separatorsmentioning
confidence: 99%
“…[56] These pore gaps allow the migration of Li + during the charging and discharging process. [57] Porosity is defined as the ratio of the volume of micropores to the total volume of the separator. [58] High porosity results in poor thermal shutdown when the separator experiences high temperature and unsatisfactory mechanical properties.…”
Section: Chemsuschemmentioning
confidence: 99%