Theoretical and Experimental Investigations of Coupled Mechanics and Electrochemistry in Silicon Anodes Lithium Ion Batteries

Project: Research project

Description

The development of high-energy storage devices is one of top most important research areas in recent years and rechargeable batteries are anticipated to be the primary sources of power for modern-day requirements. Lithium (Li) ion battery is one such rechargeable batteries that has been investigated because of their high energy density, no memory effect, reasonable life cycle, and one of the best energy-to-weight ratios and has applications in portable electronic devices, satellites, and potentially electric vehicles. Silicon is an attractive anode material being closely scrutinized for use in Li-ion batteries because of its highest-known theoretical charge capacity of 4,200 mAh/g. However, the development of Si-anode Li-ion batteries has lagged behind because of their large mechanical deformation, i.e., up to 400% volumetric change, during electrochemical reactions, which results in fracture, pulverization and early capacity fading. In other words, this coupled mechanics (e.g., volumetric change) and electrochemistry problem is the bottleneck on the development of Si anode Li-ion batteries. Therefore, a fundamental understanding of this coupled behavior of mechanics and electrochemistry will not only advance our knowledge on the failure of Si under lithiation, but also provide a basis to resolve this bottleneck in the development of the promising Si-anode Li-ion batteries.
StatusFinished
Effective start/end date9/1/128/31/14

Funding

  • National Science Foundation (NSF): $75,000.00

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Electrochemistry
Silicon
Mechanics
Anodes
Secondary batteries
Electric vehicles
Energy storage
Life cycle
Lithium-ion batteries
Satellites
Data storage equipment