【国际学者无界讲堂】香港理工大学徐正龙副教授：Calcium ion batteries: new insight in multivalent metal ion electrochemistry

The growing demand for electric vehicles and stationary energy storage systems calls for developing next generation batteries that combine high energy, high power and low cost. Among many post lithium-ion batteries, calcium rechargeable batteries utilizing divalent Ca2+ ion charge carriers are expected to offer clear benefits in affordability and potentially high energy density, due to the abundance of calcium in the Earth’s crust (46600 ppm versus 20 ppm for lithium) and the low redox potential of Ca/Ca2+ (-2.9 V vs. standard hydrogen electrode). However, the lack of suitable electrodes is the Achille’s heel of the calcium rechargeable battery technology. The relatively large ionic radius and divalent nature of Ca ions make the insertion kinetics generally sluggish in intercalation hosts. Moreover, a large Ca2+ intercalation is supposed to cause extended volume changes, triggering a premature degradation of electrode structures. In this talk, I would like to present our recent work in exploring conventional or established electrode materials as high-performance calcium battery electrodes through new electrochemical reactions and discuss on the outlook of non-aqueous calcium rechargeable batteries. 徐正龙博士，香港理工大学工业与系统工程学系副教授，博士生导师，香港理工大学智慧能源研究院、超精密加工国家重点实验室核心成员，深空探测研究中心管委会成员。课题组致力于先进能源材料和电化学机理研究，聚焦于钙离子电池、钠离子电池、锂硫电池等领域，在Chem. Soc. Rev., Nat. Commun., Angew Chem. Int. Ed., Adv. Mater., Energy Environ. Sci., Adv. Energy Mater., Prog. Mater. Sci., Nano Today等国内外权威期刊上发表研究论文100余篇，他引用超过8000次，H因子46，获得J. Mater. Chem. A新锐科学家称号（2022）、Korea Research Fellowship Award (韩国自然科学基金委，2017)、The World’s Top 2% Scientists by Stanford University（2021-2023）、Best Youth Scholar by Microstructures (2024) 等。作为负责人主持国家自然科学基金、香港研究资助局基金、香港创新与科技基金、香港环保署基金、深圳市自然科学基金等20余项。在EcoMat、J. Energy Chem.、Battery Energy、Materials Futures等多个电化学储能领域期刊任（青年）编委。