Realizing simultaneously enhanced energy and power density full-cell construction using mixed hard carbon/
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Rare Met. https://doi.org/10.1007/s12598-019-01312-4
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Realizing simultaneously enhanced energy and power density fullcell construction using mixed hard carbon/Li4Ti5O12 electrode Shi-Fei Huang, Yao Lv, Da Tie, Yang Yu, Yu-Feng Zhao*
Received: 26 October 2018 / Revised: 18 January 2019 / Accepted: 28 June 2019 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract Practical applications of lithium-ion batteries (LIBs) with both high energy and power density are urgently demanded, which require suitable charge/discharge platform, fast charge-transfer kinetics, as well as optimal solid electrolyte interphase (SEI) layer of electrode materials. In this work, a high-performance lithium-ion battery (LIB) full cell was assembled by using commercial LiNi0.33Co0.33Mn0.33O2 (NCM111) as the positive electrode and mixed Li4Ti5O12 (LTO)/hard carbon (HC) as the negative electrode. It reveals that the component ratio between LTO and HC plays a critical role in manipulating the electric conductivity and the electro-reaction platform. The electrochemical test results show that when the content of HC is 10 wt%, the as-constructed full cell demonstrates the best electrochemical, with a maximum energy density of 149.2 Whkg-1 and a maximum power density of 2195 Wkg-1 at 10 Ag-1 (30C). This outperforms all the assembled systems within our work range and the state-ofthe-art literatures. The NCM//Li4Ti5O12 ? 10 wt% HC battery system also exhibits a good capacity retention after 1000 cycles at the current density of 1 Ag-1. This work
Shi-Fei Huang and Yao Lv have contributed equally to this work.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12598-019-01312-4) contains supplementary material, which is available to authorized users. S.-F. Huang, Y. Lv, D. Tie, Y. Yu, Y.-F. Zhao* State Key Laboratory of Metastable Materials Science and Technology, Key Laboratory of Applied Chemistry, Yanshan University, Qinhuangdao 066004, China e-mail: [email protected] Y.-F. Zhao Institute of Sustainable Energy, Shanghai University, Shanghai 200444, China
provides a new approach to enhance the full-cell performance by mixing electrode materials with different charge potentials and reaction kinetics. Keywords Hard carbon; NCM111; LTO/HC; Lithium-ion battery
1 Introduction Li-ion batteries (LIBs) are the mainstream energy storage devices for today’s electric/hybrid vehicles and portable devices [1–14]. LIBs with graphite anode and the traditional cathode electrode (LiMn2O4, LiCoO2, LiFePO4) typically demonstrate a high energy density (150–200 Whkg-1). However, the application is limited to a relatively low power density (\ 500 Wkg-1) and poor cycle performance (\ 1000 cycles) [15–18]. Thus, new type lithium-ion battery systems with high power density and high energy density are urgently demanded. As a branch of anode materials of LIBs, Li4Ti5O12 (LTO) is a ‘‘zero-strain’’ insertion electrode material (only
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