Electrolyte additive and surface coating approaches to enable high-performance graphite/Si anode for Li-ion batteries

电解质添加剂和表面涂层方法可实现锂离子电池的高性能石墨/硅负极

• 批准号: 530684-2018
• 负责人: Liu, Jian
• 金额: $ 1.82万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=657754
• 关键词: Electrolyte; additive; surface; coating; approaches

The rising level of greenhouse gases caused by fossil fuels is known to be one of the foremost drivers of**climate change. In Canada, the transportation sector was the second largest source of greenhouse gases,**accounting for 23% of total emissions in 2014. In this context, electric vehicles (EVs) are gaining widespread**interests in order to realize clean transportation. Li-ion batteries have been widely used to power today's EVs,**but suffer from limited energy density, resulting in inferior EV driving range (~200 km or less) per battery**charge. Therefore, It is imperative to devleop Li-ion batteries with higher energy density.**Graphite/Si anode holds great promise for next-genertion Li-ion batteries, due to its higher capacity than**commecial graphite anode. Springpower International Inc. (SPI), an Ontario-based clean technology company,**has developed patented graphite/Si composite anode. However, one critical challenge that SPI faces is the**relatively low efficiency and capacity retention of graphite/Si anode during long cycling, which hinder its**practical application in vehicular batteries. In this project, Prof. Jian Liu at UBC Okanagan, in partnership with**SPI, will use two interface-engineering approaches (electrolyte additive and surface coating) to address this**challenge. It is expected that these two approaches will enable the formation of robust solid electrolyte**interphases on graphite/Si anode, and significantly improve its efficiency and capacity retention.**Success of this project will deliver high-performance graphite/Si anode materials that will put SPI in a leading**position in key battery material supply. Moreover, lithium-ion battery research will have great impacts on**economic and environmental sectors of Canada. The global market for vehicular batteries is anticipated to**reach $93.94 Billion by 2026. This presents an unprecedented opportunity for Canadian battery industries**(such as SPI, E-One Moli, Corvus), and create new economic venue in the next decade.

由化石燃料引起的温室气体水平的上升被认为是气候变化的主要驱动力之一。在加拿大，交通运输部门是第二大温室气体排放源，** 占2014年总排放量的23%。在这种背景下，电动汽车（EV）正在获得广泛的利益，以实现清洁运输。锂离子电池已被广泛用于为当今的电动汽车提供动力，** 但其能量密度有限，导致每次电池充电的电动汽车行驶里程较低（约200公里或更少）。因此，开发具有更高能量密度的锂离子电池势在必行。石墨/硅负极由于其比普通石墨负极容量高，在下一代锂离子电池中具有广阔的应用前景。Springpower International Inc. (SPI)一家位于安大略省的清洁技术公司，** 开发了获得专利的石墨/硅复合阳极。然而，SPI面临的一个关键挑战是石墨/Si阳极在长时间循环期间的效率和容量保持率相对较低，这阻碍了其在车用电池中的实际应用。在这个项目中，UBC Okanagan的Jian Liu教授与 **SPI合作，将使用两种界面工程方法（电解质添加剂和表面涂层）来解决这一挑战。预计这两种方法将能够在石墨/Si阳极上形成坚固的固体电解质 ** 界面，并显着提高其效率和容量保持率。该项目的成功将提供高性能石墨/硅阳极材料，使SPI在关键电池材料供应中处于领先地位。此外，锂离子电池的研究将对加拿大的经济和环境部门产生重大影响。到2026年，全球车载电池市场预计将 ** 达到939.4亿美元。这为加拿大电池行业 **（如SPI，E-One Moli，Corvus）提供了前所未有的机会，并在未来十年创造新的经济场所。