Lithium Rechargeable Batteries as Electromechanical Actuators

Chin, Timothy; Rhyner, Urs; Koyama, Yukinori; Hall, Steven R.; Chiang, Yet‐Ming

doi:10.1149/1.2161523

Cited by 34 publications

(24 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While electrochemically induced volume changes leading to fracture of storage materials have been widely postulated as a cause of capacity loss and poor cycle life (these strains have also recently been used to advantage for mechanical actuation [24,25] ), to our knowledge the thermodynamic effects of mechanical strain energy have not been treated. Interfacial energy terms may also be important in opposing or promoting phase transformation, especially in nanoscale materials.…”

Section: Thermodynamic Modelmentioning

confidence: 99%

Strain Accommodation during Phase Transformations in Olivine‐Based Cathodes as a Materials Selection Criterion for High‐Power Rechargeable Batteries

Meethong

Huang

Speakman

et al. 2007

Adv Funct Materials

419

423

View full text Add to dashboard Cite

High energy lithium‐ion batteries have improved performance in a wide variety of mobile electronic devices. A new goal in portable power is the achievement of safe and durable high‐power batteries for applications such as power tools and electric vehicles. Towards this end, olivine‐based positive electrodes are amongst the most important and technologically enabling materials. While certain lithium metal phosphate olivines have been shown to be promising, not all olivines demonstrate beneficial properties. The mechanisms allowing high power in these compounds have been extensively debated. Here we show that certain high rate capability olivines are distinguished by having extended lithium nonstoichiometry (up to ca. 20 %), with which is correlated a reduced lattice misfit as the material undergoes an electrochemically driven, reversible, first‐order phase transformation. The rate capability in several other intercalation oxides can also be correlated with lattice strain, and suggests that nanomechanics plays an important and previously unrecognized role in determining battery performance.

show abstract

Section: Thermodynamic Modelmentioning

confidence: 99%

Strain Accommodation during Phase Transformations in Olivine‐Based Cathodes as a Materials Selection Criterion for High‐Power Rechargeable Batteries

Meethong

Huang

Speakman

et al. 2007

Adv Funct Materials

419

423

View full text Add to dashboard Cite

show abstract

“…Previous work has used a similar effect in intercalated graphite for electrochemical actuator applications because of the low coupling factor it provides (i.e., high voltage-induced stress, contrary to piezoelectrics which have low voltage-induced strain). [15][16][17] The possibility to harvest and store energy in a single device has also been demonstrated using piezo-electric materials as separator in a lithium-ion battery coin cell, where an external alternating mechanical load was used for charging the battery. 19,20 The aim of this paper is to demonstrate the possibility to harvest energy using lithium intercalated load carrying carbon fibre electrodes.…”

Section: Introductionmentioning

confidence: 99%

Piezo-Electrochemical Energy Harvesting with Lithium-Intercalating Carbon Fibers

Jacques

Lindbergh

Zenkert

et al. 2015

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The mechanical and electrochemical properties are coupled through a piezo-electrochemical effect in Li-intercalated carbon fibres. It is demonstrated that this piezo-electrochemical effect makes it possible to harvest electrical energy from mechanical work. Continuous polyacrylonitrile-based carbon fibres that can work both as electrodes for Li-ion batteries and structural reinforcement for composites materials are used in this study. Applying a tensile force to carbon fibre bundles used as Li-intercalating electrodes results in a response of the electrode potential of a few mV which allows, at low current densities, lithiation at higher electrode potential than delithiation. More electrical energy is thereby released from the cell at discharge than provided at charge, harvesting energy from the mechanical work of the applied force. The measured harvested specific electrical power is in the order of 1 µW/g for current densities in the order of 1 mA/g, but this has a potential of being increased significantly.

show abstract

“…18 This previous work was followed up by a study of actuators fabricated from intercalation materials, 19 which benefited from a strong coupling between electrochemistry and mechanics (i.e. relatively small voltages can produce very large stresses).…”

Section: Introductionmentioning

confidence: 99%

On the coupling between stress and voltage in lithium-ion pouch cells

2014

View full text Add to dashboard Cite

This paper studies the coupling between stress and open circuit voltage in a commercial lithium-ion pouch cell. This coupling is characterized through measurements of a coupling factor, which is defined as the rate of change in voltage with respect to applied mechanical stress. Based on a simple thermodynamic model, this coupling factor is expected to be related to the expansion characteristics of the pouch cell during charging. The expansion characteristics of the pouch cell are compared with measurements of the coupling factors at different states of charge, and are found to be in agreement with the simple thermodynamic model. This work opens the door for the development of mechanical force sensors based on intercalation materials.

show abstract

Lithium Rechargeable Batteries as Electromechanical Actuators

Cited by 34 publications

References 6 publications

Strain Accommodation during Phase Transformations in Olivine‐Based Cathodes as a Materials Selection Criterion for High‐Power Rechargeable Batteries

Strain Accommodation during Phase Transformations in Olivine‐Based Cathodes as a Materials Selection Criterion for High‐Power Rechargeable Batteries

Piezo-Electrochemical Energy Harvesting with Lithium-Intercalating Carbon Fibers

On the coupling between stress and voltage in lithium-ion pouch cells

Contact Info

Product

Resources

About