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yexuqing木蟲之王 (文學(xué)泰斗)
太陽系系主任
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[交流]
層狀陰極中溶劑介導(dǎo)的氧化物氫化
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層狀陰極中溶劑介導(dǎo)的氧化物氫化 ▲ 作者:GANG WAN, TRAVIS P. POLLARD, LIN MA, MARSHALL A. SCHROEDER, CHIA-CHIN CHEN, ZIHUA ZHU, ET AL. ▲鏈接: https://www.science.org/doi/10.1126/science.adg4687 ▲摘要: 自放電和化學(xué)誘導(dǎo)的機械效應(yīng)降低了嵌入式電致變色和電化學(xué)儲能裝置的日歷壽命和循環(huán)壽命。在可充電鋰離子電池中,陰極的自放電會隨著時間的推移導(dǎo)致電壓和容量損失。主流自放電模型聚焦于鋰離子從電解液擴(kuò)散至陰極的過程。 研究組展示了另一種途徑,其中層狀過渡金屬氧化物陰極的氫化通過氫從碳酸鹽溶劑轉(zhuǎn)移到脫鋰氧化物誘導(dǎo)自放電。在自放電陰極中,他們進(jìn)一步觀察到質(zhì)子和鋰離子濃度梯度負(fù)相關(guān),這有助于脫鋰陰極中化學(xué)和結(jié)構(gòu)的異質(zhì)性,從而加速降解。 在脫鋰陰極中發(fā)生的氫化會影響層狀陰極的化學(xué)-機械耦合以及鋰離子電池的日歷壽命。 ▲ Abstract: Self-discharge and chemically induced mechanical effects degrade calendar and cycle life in intercalation-based electrochromic and electrochemical energy storage devices. In rechargeable lithium-ion batteries, self-discharge in cathodes causes voltage and capacity loss over time. The prevailing self-discharge model centers on the diffusion of lithium ions from the electrolyte into the cathode. We demonstrate an alternative pathway, where hydrogenation of layered transition metal oxide cathodes induces self-discharge through hydrogen transfer from carbonate solvents to delithiated oxides. In self-discharged cathodes, we further observe opposing proton and lithium ion concentration gradients, which contribute to chemical and structural heterogeneities within delithiated cathodes, accelerating degradation. Hydrogenation occurring in delithiated cathodes may affect the chemo-mechanical coupling of layered cathodes as well as the calendar life of lithium-ion batteries. |

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