An Empirical Model for the Design of Batteries with High Energy Density
Alshareef, Husam N.
KAUST DepartmentFunctional Nanomaterials and Devices Research Group
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2020-02-13
Print Publication Date2020-03-13
Embargo End Date2021-02-13
Permanent link to this recordhttp://hdl.handle.net/10754/661575
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AbstractThe development of rechargeable batteries beyond 300 Wh kg−1 for electric vehicles remains challenging, where low-capacity electrode materials (especially a graphite anode, 372 Ah kg−1) remain the major bottleneck. Although many high-capacity alternatives (e.g., Si-based alloys, metal oxides, or Li-based anode) are being widely explored, the achieved energy density has not exceeded 300 Wh kg−1. Herein, we present a new empirical model that considers multiple design parameters, besides electrode capacities, including areal loading density, voltage difference, initial capacity balance between the anode and cathode, and initial Coulombic efficiency, to estimate the achievable energy density. This approach is used to predict battery design that can achieve an energy density of >300 Wh kg−1. The model reveals that the lithium storage capacity of electrode materials is only one of several important factors affecting the ultimate battery energy density. Our model provides a new way to review the current battery systems beyond the prism of the electrode capacity and also presents a straightforward guideline for designing batteries with higher energy densities.
CitationWu, Y., Xie, L., Ming, H., Guo, Y., Hwang, J.-Y., Wang, W., … Ming, J. (2020). An Empirical Model for the Design of Batteries with High Energy Density. ACS Energy Letters, 807–816. doi:10.1021/acsenergylett.0c00211
SponsorsThis work is supported by the National Natural Science Foundation of China (21978281, 21703285, and 21975250) and the National Key R&D Program of China (SQ2017YFGH001474). The authors also thank the Independent Research Project of the State Key Laboratory of Rare Earth Resources Utilization (110005R086), Changchun Institute of Applied Chemistry, Chinese Academy of Sciences. The research was also supported by King Abdullah University of Science and Technology (KAUST) and Hanyang University. The authors also acknowledge fruitful discussions with the research scientists at Huzhou Kunlun Power Battery Materials Co., Ltd.
PublisherAmerican Chemical Society (ACS)
JournalACS Energy Letters