Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/81078
Title: Improving the electrochemical performance of Si-based anode via gradient Si concentration
Authors: Guo, ZB 
Zhou, LM 
Yao, HM 
Keywords: Delamination
Functionally graded materials
Energy materials
Heterogeneity
Lithium-ion batteries
Issue Date: 2019
Publisher: Elsevier
Source: Materials and design, 5 Sept. 2019, v. 177, no. 5, 107851, p. 1-7 How to cite?
Journal: Materials and design 
Abstract: Silicon (Si) has long been regarded as one of the most promising anode materials for the next-generation lithiumion batteries (LIBs) due to its exceptional specific capacity and apt working voltage. However, the drastic volume change of Si during lithiation/delithiation processes tends to cause various mechanical failure problems including the delamination between current collector and electrode materials, resulting in poor stability and degradation of LIBs. Inspired by the functional graded design in natural biomaterials, we propose to solve the interfacial delamination problem by reallocating the Si in the electrode in a graded manner. The prepared graded electrodes especially those after gradient optimization are found quite successful in alleviating the interfacial delamination, resulting in higher capacity and capacity retention, higher coulombic efficiency, higher effective mass loading in comparison to the traditional ones. Specifically, the optimal graded electrode shows a charge capacity of 1299 mAh g(-1) after 50 cycles, which is much higher than that of the homogeneous electrode (66 mAh g(-1)). Such a graded electrode can be easily implemented by existing manufacturing techniques and synergize with other strategies for solving the large-volume-change problem of Si. Our work provides a guideline for the design and manufacture of the graded Si-based electrodes for LIBs.
URI: http://hdl.handle.net/10397/81078
ISSN: 0264-1275
EISSN: 1873-4197
DOI: 10.1016/j.matdes.2019.107851
Rights: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0).
The following publication Guo, Z. B., Zhou, L. M., & Yao, H. M. (2019). Improving the electrochemical performance of Si-based anode via gradient Si concentration. Materials and design, 177(5), 107851, 1-7 is available at https://dx.doi.org/10.1016/j.matdes.2019.107851
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