Enabling scale-up of mesoporous silicon for lithium-ion batteries: a systematic study of a thermal moderator.
Enabling scale-up of mesoporous silicon for lithium-ion batteries: a systematic study of a thermal moderator.
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DOI：
10.1039/d0ra09000j
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发表时间：
2021-01-19
期刊：
影响因子：
3.9
通讯作者：
Patwardhan SV
中科院分区：
文献类型：
--
作者：
Entwistle JE;Patwardhan SV
锂离子电池(LiB)在循环过程中硅的体积膨胀会导致电池的退化和容量损失。多孔硅可以解决硅活性材料面临的许多问题，并且以前被证明具有良好的循环性能。最近，我们发现了硅石镁热还原(MGTR)中孔演化的机制，并进一步证明了它有可能以可扩展和经济的方式生产多孔硅[J.Mater]。化学。A，2020，8,4938]。然而，反应过程中产生的大量过剩热影响了镁催化剂的可扩展性。虽然以前的研究表明，可以使用氯化钠作为热慢化剂来缓解这一问题，但这还没有得到系统的研究，导致对镁钛矿渣的可扩展性缺乏了解。在这里，通过对氯化钠作用的仔细研究，我们发现氯化钠的比例和还原温度是控制放大和产品性能的关键因素。我们确定了氯化钠的温度上限是一种热慢化剂。此外，我们系统地展示了氯化钠加入量和还原温度对产物硅的多孔性的影响。我们的结果为这种方法的放大奠定了基础，这样它现在就可以被用于靶向特定的多孔硅特性。通过确定关键的控制因素，这篇手稿提供了第一份能够放大介孔硅的报告，由于产生了大量的过剩热量，这是不平凡的。
The volume expansion of silicon during cycling of a lithium-ion battery (LIB) leads to degradation and capacity loss. Porous silicon can address many of the issues faced by silicon active materials and has previously been shown to have excellent cyclability. Recently we have uncovered the mechanisms underpinning the pore evolution in magnesiothermic reduction (MgTR) of silica and further demonstrated that it has the potential to produce porous silicon in a scalable and economic manner [J. Mater. Chem. A, 2020, 8, 4938]. However, the scalability of MgTR is affected by the large excess heat produced during reaction. Although previous studies have shown that NaCl can be used as a thermal moderator to mitigate this issue, this has not been systematically investigated, leading to a lack of knowledge on scalability of MgTR. Here, by carefully investigating the roles of NaCl, we show that the NaCl ratio and reduction temperature are the critical factors for controlling scale-up and the product properties. We identified the upper temperature limit of NaCl as a thermal moderator. Further, we systematically showed how the amount of NaCl and the reduction temperature affect the porous properties of the product silicon. Our results have established pathways for scaling-up this method such that it can now be taken forward to target specific porous silicon properties. By identifying the critical controlling factors, this manuscript provides the first report enabling scale-up of mesoporous silicon, which is non-trivial due to the large excess heat produced.
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DOI：
10.1007/978-981-10-5681-9
发表时间：
2017-01-01
期刊：
NOT-SO-SIMPLE STELLAR POPULATIONS IN STAR CLUSTERS
影响因子：
--
作者：
Li, C.
通讯作者：
Li, C.
影响因子：
3.4
作者：
Batchelor, L.;Loni, A.;Coffer, J. L.
通讯作者：
Coffer, J. L.
影响因子：
3.5
作者：
Barati, M.;Sarder, S.;Roy, R.
通讯作者：
Roy, R.
影响因子：
0.9
作者：
Larbi, K. K.;Barati, M.;McLean, A.
通讯作者：
McLean, A.
影响因子：
32.5
作者：
Thackeray, Michael M.;Wolverton, Christopher;Isaacs, Eric D.
通讯作者：
Isaacs, Eric D.