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活动简介
近年来，中澳两国的研究人员在材料、物理、化学、生物等研究领域始终保持着密切、广泛的合作。双方密切的国际合作已经取得了大量的重要研究成果，积极的促进了相关科学领域的发展。
中澳量子科学与先进材料系列讲座是由中澳学者联合会发起，北航-伍伦贡联合研究中心与邃瞳科学云承办的前沿学术交流，旨在促进中国与澳大利亚的量子科学与先进材料以及相关领域的学术交流合作，并以此次系列讲座作为一个契机给国内外的研究学者提供展示交流的平台。系列讲座将邀请多名中澳知名学者、研究人员分享最新的研究成果，传播科学知识，探讨领域研究方向。
Introduction
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In recent years, Chinese and Australian researchers have maintained close and extensive cooperation in the fields of material science, physics, chemistry, biology and the others. The close international cooperation between the two sides has yielded a large number of important research results and actively promoted the development of relevant scientific fields.
China-Australia Quantum Science and Advanced Materials Series of Lectures are sponsored by China-Australia Scholars Federation and held by Sui Tong Science Cloud. This cutting-edge academic communication aims at promoting academic exchanges and cooperation between China and Australia in quantum science, advanced materials and other related fields.
These series of lectures, as an great opportunity, will provide a platform for further communication between domestic and foreign researchers. we will invite many renowned Chinese and Australian scholars and researchers to share the latest research results, disseminate scientific knowledge and discuss the research direction.
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讲座嘉宾
郭再萍目前是澳大利亚阿德莱德大学教授，伍伦贡大学荣誉教授。其课题组主要从事储能材料的研究，致力于探究低耗高效的方式合成二次电池电极材料，开发高性能电池，解决可充电池以及其他储能设备中的关键问题。郭教授在 Nat. Common., Sci. Adv., J. Am. Chem. Soc., Joule, Angew. Chem. Int. Ed., Adv. Mater.等国际著名期刊发表科研论文500多篇。论文被引次数超过38,000次，H-index为105，并且已在高压锂电池，水系锌电池，功能电解液等方面申请了多项国际专利。
郭教授在2021年荣获澳大利亚研究委员会桂冠学者，2020年获新南威尔士州州长奖，2019年获伍伦贡大学校长奖，2015年荣获澳大利亚研究委员会未来学者, 2010年获澳大利亚伊丽莎白女王基金奖, 澳大利亚青年科学家奖等。她连续四年成为汤姆森路透高被引学者（2018-2021）。郭教授目前担任英国皇家化学会Chemical Science副主编。
Short Biography
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Professor Zaiping Guo is an Australian Laureate Fellow at School of Chemical Engineering & Advanced Materials, The University of Adelaide. She is also an Associate Editor for Chemical Science, a flagship journal of the RSC. Her research focuses on the design and application of electrode materials and electrolyte for energy storage and conversion, including rechargeable batteries, hydrogen storage, and fuel cells. Her research achievements have been recognized through numerous awards, including an ARC Queen Elizabeth II Fellowship in 2010, an ARC Future Professorial Fellowship in 2015, an ARC Laureate Fellowship (2021), and the Clarivate Analytics Highly Cited Researcher Award in 2018, 2019, 2020, and 2021. She was also awarded 2020 NSW Premier's Prizes for Science & Engineering for Excellence in Engineering or Information and Communications Technology.
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讲座摘要
锂离子电池（LIBs）已经成为我们日常生活中不可或缺的一部分，为各种便携式设备和电动汽车提供动力。然而，目前锂离子电池由于其有限的能量密度而无法满足日益增长的技术需求。近些年，大量研究工作以探索具有更高能量密度的电极材料作为目标，尤其是阴极材料设计和制备。这主要是因为锂离子电池的能量密度由工作电压和电池容量决定，而发展新的阴极材料是提高电池性能的最有效手段之一。在本讲座中，我将向大家介绍我们在高工作电压或高电池容量的锂离子电池高性能阴极材料方面的最新进展，包括高电压尖晶石LiNi0.5Mn1.5O4（LNMO）和高容量富锂层状氧化物Li1+xTM1-xO2（LLO）等材料。LNMO阴极材料相对于Li来说有着4.7 V的高电压，这对材料结构的稳定性提出了挑战并导致容量的快速衰减。我们成功稳定了尖晶石结构，并通过特定晶体位点的结构工程策略实现了长的电池循环寿命，这包括最初尝试在Fd-3m 8a（四面体）和16c（八面体）位点进行元素掺杂，随后在八面体16d和16c位点进行优化，以及在尖晶石结构中引入一个新的稳定轨道相互作用。虽然LLO材料可以提供280 mAh g-1的高容量和900 Wh kg-1的能量密度，但它存在由于颗粒表面引起的电压衰减和容量退化的问题。因此，我们在材料颗粒上采用了高相兼容的表面涂层，这不仅减轻了有害的副反应，而且有助于调节可逆氧还原化学。相信我们的研究成果将为下一代锂离子电池的高能密度阴极材料的设计提供有益的指导和新的见解。
Abstract
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Lithium-ion batteries (LIBs) now become an indispensable part of our daily lives, powering various portable devices and electric vehicles. However, current LIBs fail to meet the increasing demands of developing technologies due to their limited battery energy densities, therefore stimulating intensive research efforts to explore new candidates with higher energy densities. Cathode material is one of the battery performance limitations, of which the energy density is determined by its working voltage and battery capacity. In this talk, I will brief you our recent progress on the high-performance cathode materials with either high operating voltage or high battery capacity for LIBs, including high-voltage spinel LiNi0.5Mn1.5O4 (LNMO) and high-capacity Li-rich layered oxide Li1+xTM1-xO2 (LLO) materials.
LNMO cathodes have high voltage of 4.7 V vs. Li, which challenges the stability of material structure and results in rapid capacity decay. We successfully stabilize the spinel structure and achieving long battery cycle life via strategy of crystallographic-site-specific structural engineering, which involves initial attempt of elemental doping at Fd-3m 8a (tetrahedral) and 16c (octahedral) sites, followed by subsequent optimization at octahedral 16d and 16c sites as well as introducing a novel stable orbital interaction into the spinel structure. Although LLO materials could deliver high capacities of 280 mAh g-1 and energy density of 900 Wh kg-1, it suffers issues of voltage decay and capacity degradation, originating from the particle surface.
We therefore employ highly phase-compatible surface coating on the material particles, which not only relieves hazardous side reactions, but also contributes to regulated reversible oxygen redox chemistry. We believe our efforts could offer helpful guidance and new insights into the design of the high-energy-density cathode materials for next-generation LIBs.
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