{"id":2261,"date":"2023-07-08T11:44:24","date_gmt":"2023-07-08T11:44:24","guid":{"rendered":"https:\/\/thisbiginfluence.com\/?p=2261"},"modified":"2023-07-08T11:44:24","modified_gmt":"2023-07-08T11:44:24","slug":"new-priming-method-improves-battery-life-by-up-to-44","status":"publish","type":"post","link":"https:\/\/thisbiginfluence.com\/?p=2261","title":{"rendered":"New Priming Method Improves Battery Life by Up to 44%"},"content":{"rendered":"


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Rice College researchers have developed a scalable methodology to reinforce lithium-ion batteries\u2019 lifespan utilizing prelithiation, a course of that coats silicon anodes with stabilized lithium steel particles, enhancing battery life by as much as 44%.<\/p>\n

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Engineers from Rice College make developments in prelithiation and unravel the mechanism of lithium trapping.<\/h3>\n

The potential of silicon anode batteries to remodel power storage options is pivotal in addressing local weather aims and totally realizing the capabilities of electrical automobiles.<\/p>\n

Nonetheless, the persistent lack of lithium ions in silicon anodes is a big hindrance to the\u00a0growth of next-generation lithium-ion batteries.<\/p>\n

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Scientists at Rice University\u2019s<\/a> George R. Brown Faculty of Engineering have developed a readily scalable methodology to optimize prelithiation, a course of that helps mitigate lithium loss and improves battery life cycles by coating silicon anodes with stabilized lithium steel particles (SLMPs).<\/p>\n

\"Quan<\/p>\n

Quan Nguyen (left), Sibani Lisa Biswal, and collaborators developed a prelithiation method that helps enhance the efficiency of lithium-ion batteries with silicon anodes. Credit score: Jeff Fitlow\/Rice College<\/p>\n

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The Rice lab of chemical and biomolecular engineer Sibani Lisa Biswal discovered that spray-coating the anodes with a mix of the particles and a surfactant improves battery life by 22% to 44%. Battery cells with a higher quantity of the coating initially achieved a better stability and cycle life. Nevertheless, there was a downside: When cycled at full capability, a bigger quantity of the particle coating led to extra lithium trapping, inflicting the battery to fade extra quickly in subsequent cycles.<\/p>\n

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The research is printed in ACS Utilized Power Supplies.<\/p>\n

Changing graphite with silicon in lithium-ion batteries would considerably enhance their power density \u23af the quantity of power saved relative to weight and measurement \u23af as a result of graphite, which is product of carbon, can pack fewer lithium ions than silicon. It takes six carbon atoms for each single lithium-ion, whereas only one silicon atom<\/span> can bond with as many as four lithium ions<\/a>.<\/p>\n

\"Quan<\/p>\n

Quan Nguyen is a chemical and biomolecular engineering doctoral alum and lead author on the study. Credit: Jeff Fitlow\/Rice University<\/p>\n

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\u201cSilicon is one of those materials that has the capability to really improve the energy density for the anode side of lithium-ion batteries,\u201d Biswal said. \u201cThat\u2019s why there\u2019s currently this push in battery science to replace graphite anodes with silicon ones.\u201d<\/p>\n

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However, silicon has other properties that present challenges.<\/p>\n

\u201cOne of the major problems with silicon is that it continually forms what we call a solid-electrolyte interphase or SEI layer that actually consumes lithium,\u201d Biswal said.<\/p>\n

The layer is formed when the electrolyte in a battery cell reacts with electrons and lithium ions, resulting in a nanometer-scale layer of salts deposited on the anode. Once formed, the layer insulates the electrolyte from the anode, preventing the reaction from continuing. However, the SEI can break throughout the subsequent charge and discharge cycles, and, as it reforms, it irreversibly depletes the battery\u2019s lithium reserve even further.<\/p>\n

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Quan Nguyen (left) and Sibani Lisa Biswal. Credit: Jeff Fitlow\/Rice University<\/p>\n

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\u201cThe volume of a silicon anode will vary as the battery is being cycled, which can break the SEI or otherwise make it unstable,\u201d said Quan Nguyen, a chemical and biomolecular engineering doctoral alum and lead author on the study. \u201cWe want this layer to remain stable throughout the battery\u2019s later charge and discharge cycles.\u201d<\/p>\n

The prelithiation method developed by Biswal and her team improves SEI layer stability, which means fewer lithium ions are depleted when it is formed.<\/p>\n

\u201cPrelithiation is a strategy designed to compensate for the lithium loss that typically occurs with silicon,\u201d Biswal said. \u201cYou can think of it in terms of priming a surface, like when you\u2019re painting a wall and you need to first apply an undercoat to make sure your paint sticks. Prelithiation allows us to \u2018prime\u2019 the anodes so batteries can have a much more stable, longer cycle life.\u201d<\/p>\n

While these particles and prelithiation are not new, the Biswal lab was able to improve the process in a way that is readily incorporated into existing battery manufacturing processes.<\/p>\n

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\"Quan<\/p>\n

Quan Nguyen holds one of the batteries assembled using the prelithiation protocol described in the study. Credit: Jeff Fitlow\/Rice University<\/p>\n

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\u201cOne aspect of the process that is definitely new and that Quan developed was the use of a surfactant to help disperse the particles,\u201d Biswal said. \u201cThis has not been reported before, and it\u2019s what allows you to have an even dispersion. So instead of them clumping up or building up into different pockets within the battery, they can be uniformly distributed.\u201d<\/p>\n

Nguyen explained that mixing the particles with a solvent without the surfactant will not result in a uniform coating. Moreover, spray-coating proved better at achieving an even distribution than other methods of application onto anodes.<\/p>\n

\u201cThe spray-coating method is compatible with large-scale manufacturing,\u201d Nguyen said.<\/p>\n

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Controlling the cycling capacity of the cell is crucial to the process.<\/p>\n

\u201cIf you do not control the capacity at which you cycle the cell, a higher amount of particles will trigger this lithium-trapping mechanism we discovered and described in the paper,\u201d Nguyen said. \u201cBut if you cycle the cell with an even distribution of the coating, then lithium trapping won\u2019t happen.<\/p>\n

\u201cIf we find ways to avoid lithium trapping by optimizing cycling strategies and the SLMP amount, that would allow us to better exploit the higher energy density of silicon-based anodes.\u201d<\/p>\n

Reference: \u201cPrelithiation Effects in Enhancing Silicon-Based Anodes for Full-Cell Lithium-Ion Batteries Using Stabilized Lithium Metal Particles\u201d by Quan Anh Nguyen, Anulekha K. Haridas, Tanguy Terlier and Sibani Lisa Biswal, 1 May 2023, ACS Applied Energy Materials<\/em>.
DOI: 10.1021\/acsaem.3c00713<\/a><\/p>\n

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Biswal is Rice\u2019s William M. McCardell Professor in Chemical Engineering, a professor of materials science and nanoengineering, and associate dean for faculty development.<\/p>\n

The study was funded by Ford Motor Co.\u2019s University Research Program, the National Science Foundation, and the Shared Equipment Authority at Rice.<\/p>\n

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