Design-Considerations regarding Silicon/Graphite and Tin/Graphite Composite Electrodes for Lithium-Ion Batteries

被引：31
作者：
Otero, Manuel [1 ,2 ]
Heim, Christopher [3 ]
Leiva, Ezequiel P. M. [2 ]
Wagner, Norbert [3 ]
Friedrich, Andreas [3 ,4 ]
机构：
[1] Univ Nacl Cordoba, Fac Matemat Astron & Fis, IFEG, Cordoba, Argentina
[2] Univ Nacl Cordoba, Fac Ciencias Quim, Dept Quim Teor & Computac, INFICQ, Cordoba, Argentina
[3] German Aerosp Ctr DLR, Inst Engn Thermodynam, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
[4] Univ Stuttgart, Inst Energy Storage, Pfaffenwaldring 6, D-70550 Stuttgart, Germany
来源：
SCIENTIFIC REPORTS | 2018年 / 8卷
关键词：
ENERGY DENSITY; NEGATIVE ELECTRODES; SILICON NANOWIRES; FACILE SYNTHESIS; SI; ANODE; CAPACITY; NANOPARTICLES; SHEETS;
D O I：
10.1038/s41598-018-33405-y
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
An analytical model is proposed to investigate properties of composite electrodes that utilize more than one active material. We demonstrate how the equations can be applied to aid in the design of electrodes by comparing silicon-graphite and tin-graphite composite negative electrodes as examples with practical relevance. Based on simple assumptions, the results show how volume expansion tolerance and initial porosity are important factors for the achievable gravimetric and volumetric capacities as well as volumetric energy density. A Si-alloy/graphite composite electrode is used as an experimental system to corroborate the formulated analysis. Kinetic limitations are also addressed based on a novel heuristic approach.
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页数：10
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