Development of a LiFePO 4 -based high power lithium secondary battery for HEVs applications
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Rare Met. DOI 10.1007/s12598-014-0316-1
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Development of a LiFePO4-based high power lithium secondary battery for HEVs applications Long-Zheng Deng, Feng Wu*, Xu-Guang Gao, Wei-ping Wu
Received: 9 September 2013 / Revised: 21 October 2013 / Accepted: 16 May 2014 Ó The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2014
Abstract A LiFePO4-type lithium secondary battery cell of 8 Ah capacity with a high energy density and power density was developed for hybrid electric vehicle (HEV) applications by optimizing the key raw materials and process design. The 8 Ah class LiFePO4 cell with an energy density of 77.2 Whkg-1 exhibits a power density of 2818 Wkg-1 at 50 % SOC (state of charge). The battery shows good cyclic capability with the capacity retention of 81.1 % after 1,870 cycles at 5C charge and 10C discharge rates. It is demonstrated that the cells have an excellent balance of high-power, high-energy, low temperature, and long-life performance for meeting the requirements of HEV. Keywords Li-ion battery; Lithium iron phosphate; High-power; Long-life; Hybrid electric vehicle
Electronic supplementary material The online version of this article (doi:10.1007/s12598-014-0316-1) contains supplementary material, which is available to authorized users. L.-Z. Deng, F. Wu* Beijing Key Laboratory of Environmental Science and Engineering, School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, China e-mail: [email protected] X.-G. Gao, W. Wu National & Local United Engineering Laboratory for Power Battery, Department of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, Changchun 130024, China
1 Introduction The worldwide demand for clean, low-fuel-consuming transport is promoting the development of safe, high energy and power electrochemical storage and conversion systems [1, 2]. Lithium ion batteries (LIBs) are nowadays considered as the best technology for these applications [3, 4]. So, research and development of electric vehicle (EV) and hybrid electric vehicle (HEV) are an effective way for energy conservation and emissions reduction. However, as the key components of HEV, power battery performance is an important factor that determines the automobile performance. Meanwhile, safety now represents the main challenge holding up the lithium-ion technology from wide application in HEVs. In all types of LIBs, lithium iron phosphate (LiFePO4)-based LIBs with the advantages of low cost, good safety, environmental friendly, and long cycle life were investigated intensively [5, 6]. Many countries invested heavily in researching and developing this technology. The objective of this work is to develop HEV used LiFePO4-type lithium ion secondary batteries in order to improve the energy density and the power density of the battery and optimize the performance using selected key raw materials including cathode materials, anode materials, membrane, electrolyte, etc. In this paper, it was repor
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