In situ Measurement of Biaxial Modulus of Si Anode for Li-ion Batteries

Details In situ Measurement of Biaxial Modulus of Si Anode for Li-ion Batteries In situ Measurement of Biaxial Modulus of Si Anode for Li-ion Batteries

2011-08-02

arxiv.org/abs/1108.0567v1

Electrochemistry Communications, 12(11), 1614-1617, 2010

Physics

Condensed Matter

Materials Science

8 pages, 3 figures

Scientific paper

10.1016/j.elecom.2010.09.008

We report in situ measurement of biaxial moduli of a Si thin-film electrode as a function of its lithium concentration. During lithiation, biaxial compressive stress is induced in the Si film and it undergoes plastic flow. At any state-of-charge (SOC), a relatively small delithiation-relithiation sequence unloads and reloads the film elastically. From the stress and strain changes during a delithiation-relithiation cycle, the biaxial modulus of the film is calculated. Stress change is obtained by measuring the change in substrate curvature using a Multi-beam Optical Sensor; the elastic strain change is obtained from the change in SOC. By repeating these measurements at several different values of SOC, the biaxial modulus was seen to decrease from ca. 70 GPa for Li0.32Si to ca. 35 GPa for Li3.0Si. Such a significant reduction in elastic modulus has important implications for modeling stress evolution and mechanical degradation in Si-based anodes.

Affiliated with

Also associated with

No associations

Rating

In situ Measurement of Biaxial Modulus of Si Anode for Li-ion Batteries does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with In situ Measurement of Biaxial Modulus of Si Anode for Li-ion Batteries, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In situ Measurement of Biaxial Modulus of Si Anode for Li-ion Batteries will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-510005