A combining electrochemical model for LiFePO 4 ‐graphite lithium‐ion battery considering cathode heterogeneous solid phase phenomenon

International Journal of Energy ResearchVolume 46, Issue 11 p. 15231-15243 RESEARCH ARTICLE A combining electrochemical model for LiFePO4-graphite lithium-ion battery considering cathode heterogeneous solid phase phenomenon Bangjun Guo, Bangjun Guo orcid.org/0000-0001-6353-5190 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSearch for more papers by this authorChenghao Liu, Chenghao Liu School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSearch for more papers by this authorYizhao Gao, Yizhao Gao School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSearch for more papers by this authorChong Zhu, Chong Zhu School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSearch for more papers by this authorXi Zhang, Corresponding Author Xi Zhang braver1980@sjtu.edu.cn School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China Correspondence Xi Zhang, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China. Email: braver1980@sjtu.edu.cn Fang Wang, China Automotive Technology and Research Center Co., Ltd., Tianjin, China. Email: wangfang2011@catarc.ac.cnSearch for more papers by this authorXiaole Ma, Xiaole Ma CATARC New Energy Vehicle Test Center(Tianjin)Co., Ltd., Tianjin, ChinaSearch for more papers by this authorFang Wang, Corresponding Author Fang Wang wangfang2011@catarc.ac.cn China Automotive Technology and Research Center Co., Ltd., Tianjin, China Correspondence Xi Zhang, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China. Email: braver1980@sjtu.edu.cn Fang Wang, China Automotive Technology and Research Center Co., Ltd., Tianjin, China. Email: wangfang2011@catarc.ac.cnSearch for more papers by this author Bangjun Guo, Bangjun Guo orcid.org/0000-0001-6353-5190 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSearch for more papers by this authorChenghao Liu, Chenghao Liu School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSearch for more papers by this authorYizhao Gao, Yizhao Gao School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSearch for more papers by this authorChong Zhu, Chong Zhu School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, ChinaSearch for more papers by this authorXi Zhang, Corresponding Author Xi Zhang braver1980@sjtu.edu.cn School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China Correspondence Xi Zhang, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China. Email: braver1980@sjtu.edu.cn Fang Wang, China Automotive Technology and Research Center Co., Ltd., Tianjin, China. Email: wangfang2011@catarc.ac.cnSearch for more papers by this authorXiaole Ma, Xiaole Ma CATARC New Energy Vehicle Test Center(Tianjin)Co., Ltd., Tianjin, ChinaSearch for more papers by this authorFang Wang, Corresponding Author Fang Wang wangfang2011@catarc.ac.cn China Automotive Technology and Research Center Co., Ltd., Tianjin, China Correspondence Xi Zhang, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China. Email: braver1980@sjtu.edu.cn Fang Wang, China Automotive Technology and Research Center Co., Ltd., Tianjin, China. Email: wangfang2011@catarc.ac.cnSearch for more papers by this author First published: 16 June 2022 https://doi.org/10.1002/er.8220 Funding information: National Key Special Projects for International Cooperation in Science and Technology Innovation, Grant/Award Number: 2019YFE0100200; National Natural Science Foundation of China, Grant/Award Numbers: 52007119, 52177218 Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Summary The mounting requirement for advanced lithium-ion batteries (LIBs) is based on the enhancement of their whole work life. The application of battery models is vital to improve the control and management ability of sophisticated battery system. Latest work has demonstrated that the open-circuit potential (OCP) of a full LiFePO4-graphite battery (LFP) which is critical to model accuracy. But the OCP is inconsistent along with the charge and discharge cycles, which also varies with different discharge C-rates. In this study, to simulate the special discharge voltage of a commercial LiFePO4-graphite cell, a mesoscopic model for LFP cathode solid particles is proposed, which is considering the dynamical reaction in the positive region by introducing of many-particle model. Different with the conventional way to capture the OCP by experimental measurement or empirical function, the mesoscopic model divides the electrode solid phase into several units possessing the non-monotonic reference potential which is employed the Margules equation. In this way, the potential can be integrally calculated, which is much approaching to the true OCP. Besides, the charge reaction resistance is regarded as equivalent direct current resistances assumed to be in line with the Gauss distribution law. We also considered the appearance and vanishment of the discharging platform during the high C-rates discharge cycles, which can be explained by the phase changing phenomenon of LFP OCP. And for the calculation of a full cell voltage, the electrolyte and anode part of model are retained from single-particle model with electrolyte dynamics (SPMe), so that it can be processed by Laplace transformation and followed by Padé approximation for the simplicity. The SPMe combined with our many-particle mesoscopic model is capable to ultimately simulate the characteristic of a full LiFePO4-graphite battery discharge voltage. Volume46, Issue11September 2022Pages 15231-15243 RelatedInformation