Inexpensive thermochemical energy storage utilising additive enhanced limestone
Inexpensive thermochemical energy storage utilising additive enhanced limestone
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DOI：
10.1039/d0ta03080e
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发表时间：
2020-05
影响因子：
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通讯作者：
Kasper T. Møller;Ainee Ibrahim;C. Buckley;M. Paskevicius
中科院分区：
文献类型：
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作者：
Kasper T. Møller;Ainee Ibrahim;C. Buckley;M. Paskevicius
储能是我们社会实现向可再生能源过渡的关键挑战之一。石灰石吸热分解成石灰和CO2是最具成本效益的储能系统之一，但它在重复能量循环时会显着降低（低于10%容量）。这项研究提出了第一个CaCO 3系统在物理条件下运行，模拟现实生活中的“热电池”在延长的循环寿命。这些重要的结果表明，基于CaCO 3的热能储存装置将适用于一系列应用，例如集中式太阳能发电厂、风力发电场、光伏发电和过剩电网能源。900 °C的工作温度确保了比最先进技术更高的卡诺效率，而材料成本仅为一小部分。纯CaCO 3作为煅烧/碳酸化循环的函数的容量退化通过添加ZrO 2（40重量%）或Al 2 O3（20重量%）来克服，这导致在超过80%容量下的500次能量存储循环。添加剂导致三元化合物的形成，例如CaZrO 3和Ca 5Al 6 O 14，其限制烧结并允许Ca 2+和O2−离子传输到反应位点。
Energy storage is one of the key challenges in our society to enable a transition to renewable energy sources. The endothermic decomposition of limestone into lime and CO2 is one of the most cost-effective energy storage systems but it significantly degrades on repeated energy cycling (to below 10% capacity). This study presents the first CaCO3 system operating under physical conditions that mimic a real-life ‘thermal battery’ over an extended cycling life. These important results demonstrate that a thermal energy storage device based on CaCO3 will be suitable for a range of applications, e.g. concentrated solar power plants, wind farms, photovoltaics, and excess grid energy. The operating temperature of 900 °C ensures a higher Carnot efficiency than state-of-the-art technologies at a fraction of the material cost. The capacity degradation of pure CaCO3 as a function of calcination/carbonation cycling is overcome by the addition of either ZrO2 (40 wt%) or Al2O3 (20 wt%), which results in 500 energy storage cycles at over 80% capacity. The additives result in the formation of ternary compounds, e.g. CaZrO3 and Ca5Al6O14, which restrict sintering and allow for the transmission of Ca2+ and O2− ions to reaction sites.