In Situ Stress Evolution in Li1+xMn2O4Thin Films during Electrochemical Cycling in Li-Ion Cells

Sheth, Jay; Karan, Naba K.; Abraham, Daniel P.; Nguyen, Cao Cuong; Lucht, Brett L.; Sheldon, Brian W.; Guduru, Pradeep R.

doi:10.1149/2.0161613jes

Cited by 31 publications

(25 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among them, the doping strategy usually choses other heterogeneous ions (Li + , Mg 2+ , Zn 2+ , Al 3+ , Cr 3+ , Si 4+ , etc.) to replace a small amount of manganese ions [2,9,22,23,24,25]. As a result, the Jahn–Teller distortion effect can be decreased, which enhances the structural stability of LiMn 2 O 4 .…”

Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Zhao

Nie

Que³

et al. 2019

Materials

View full text Add to dashboard Cite

In this work, the spinel LiMn2O4 cathode material was prepared by high-temperature solid-phase method and further optimized by co-modification strategy based on the Mg-doping and octahedral morphology. The octahedral LiMn1.95Mg0.05O4 sample belongs to the spinel cubic structure with the space group of Fd3m, and no other impurities are presented in the XRD patterns. The octahedral LiMn1.95Mg0.05O4 particles show narrow size distribution with regular morphology. When used as cathode material, the obtained LiMn1.95Mg0.05O4 octahedra shows excellent electrochemical properties. This material can exhibit high capacity retention of 96.8% with 100th discharge capacity of 111.6 mAh g−1 at 1.0 C. Moreover, the rate performance and high-temperature cycling stability of LiMn2O4 are effectively improved by the co-modification strategy based on Mg-doping and octahedral morphology. These results are mostly given to the fact that the addition of magnesium ions can suppress the Jahn–Teller effect and the octahedral morphology contributes to the Mn dissolution, which can improve the structural stability of LiMn2O4.

show abstract

Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Zhao

Nie

Que³

et al. 2019

Materials

View full text Add to dashboard Cite

show abstract

“…Then, it experienced an anomalous drop and became compressive upon full delithiation . The first cycle anomalous stress drop has also been reported for LiMn 2 O 4 , being ascribed to electrochemical reaction‐triggered structural changes such as oxygen loss and cation reordering. However, such a case merely takes place in the first cycle, and the stress response would be reversible in the following cycles.…”

Section: Stress Development In the Asslibsmentioning

confidence: 66%

“…Energy Mater. [329] The first cycle anomalous stress drop has also been reported for LiMn 2 O 4 , [330] being ascribed to electrochemical reaction-triggered structural changes such as oxygen loss and cation reordering. Reproduced with permission.…”

Section: Multibeam Optical Stress Sensor (Moss) Techniquementioning

confidence: 83%

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Liu

et al. 2019

Advanced Energy Materials

View full text Add to dashboard Cite

The continuous depletion of fossil fuels, the increase of oil prices, and the need to decrease CO 2 emissions have stimulated intensive research on developing alternative renewable and clean energy sources. [1] Among these alternative energy sources, rechargeable Li-ion batteries (LIBs) are one of the promising candidates. To date, the LIBs basically consisting of a positive electrode (cathode), an electrolyte, and a negative electrode (anode) have widespread applications, such as portable electronic devices, pure electric vehicles (PEVs), and hybrid electric vehicles (HEVs). [2] The state-of-the-art electrolytes are usually the lithium salts (LiPF 6 , LiBF 4 , and LiCF 3 SO 3 ) dissolved in organic solvents, i.e., ethylene carbonate, propylene carbonate, polyethylene oxide, and dimethyl carbonate, [3] which exhibit excellent wetting of the electrodes and produce a fast transfer of Li + ions upon charging and discharging. However, they suffer from flammability, poor electrochemical stability, limited temperature range of operation, and low power density. [4] There is an ever-increasing demand for batteries with a higher energy and power density, although current LIBs offer volumetric and gravimetric energy densities up to 770 Wh L −1 and 260 Wh kg −1 , respectively. [5] To improve the energy/power density of LIBs, one way is to adopt high-potential cathode materials such as LiNi 0.5 Mn 1.5 O 4 (LNMO). The high-voltage plateau of LNMO (≈4.7 V vs Li/Li + ) makes its energy density 20-30% higher than the energy density of commercial LiCoO 2 and LiFePO 4 . [6] However, successful commercialization of the LNMO is restricted in high-energy LIBs due to electrolyte decomposition and side reaction of the cathodes and liquid electrolytes when operating at high voltages. [7,8] The other way to improve the energy/power density is to replace the conventional graphite anode with Li metal. The Li metal, with a low anode potential (−3.04 V vs standard hydrogen electrode) and high specific capacity (3862 mAh g −1 for the Li anode versus 372 mAh g −1 for the graphite anode), [9][10][11] has been considered as the "Holy Grail" of battery technologies. When paired with sulfur and oxygen, the theoretical energy density of Li-S (≈2567 Wh kg −1 ) and Li-O 2 (≈3505 Wh kg −1 ) batteries is far higher than the theoretical energy density of conventional LIBs (≈387 Wh kg −1 ). [12][13][14][15] When Li metal approaches the liquid electrolytes, however, unstable Li/electrolyte interface Rechargeable Li-ion batteries (LIBs) are electrochemical storage device widely applied in electric vehicles, mobile electronic devices, etc. However, traditional LIBs containing liquid electrolytes suffer from flammability, poor electrochemical stability, and limited operational temperature range. Replacement of the liquid electrolytes with inorganic solid-state electrolytes (SSEs) would solve this problem. However, several critical issues, such as poor interfacial compatibility, low ionic conductivity at ambient temperatures, etc., need to be surmounted befor...

show abstract

“…[35] The values of compressive or tensile stresses in different electrodes or of various thicknesses exhibited great differences and showed different trends with capacity. [13,[31][32][33][34][35] However, this technology requires a thick wafers about 500~1000 um as a measurement basis, therefor fails to characterize the stress in a current collector which is also important. And in this method the calculated stress by Stoney equation ignores bending stress and, more importantly, ignores the already confirmed concentration-dependent elastic modulus of the active material.…”

Section: Introductionmentioning

confidence: 99%

“…These investigators applied MOSS to measure the deformation and stress of various electrodes during electrochemical lithiation and delithiation cycles, such as those of Si, graphite, Ge, Sn, and Li 1+ x Mn 2 O 4 . The values of compressive or tensile stresses in different electrodes or of various thicknesses exhibited great differences and showed different trends with capacity ,. However, this technology requires a thick wafers about 500∼1000 um as a measurement basis, therefor fails to characterize the stress in a current collector which is also important.…”

Section: Introductionmentioning

confidence: 99%

Modified Stoney Model and Optimization of Electrode Structure Based on Stress Characteristics

et al. 2019

View full text Add to dashboard Cite

Stress in electrodes is inherently linked to mechanical failure that leads to degradation of cycle performance. To optimize battery performance, we propose a modified Stoney model to study the deformation and stress of a bilayer electrode. This model couples bending deformation and electrochemical‐dependent elastic modulus of active layer, and we apply the model to systematically analyze how thickness ratio l, modulus ratio m, bending, and electrochemical‐dependent elastic modulus impact stresses across a wide range. Results show that stresses non‐monotonously vary with l and m. Surface stress of active material transforms from a trend of first decrease and then increase to monotonous increase with m, and first increases and then decreases with l. Therefore, Li‐induced softening and stiffening as well as Li‐induced‐increased thickness relieve stresses within a certain range. Based on stress characterization, some electrode structures are suggested to improve battery performance. For a constant elastic modulus of active layer, l and m should be smaller or make stress factor close to 0. And l and m should be selected on the left (right or near) of extreme points for softening (stiffening) of active layer. This work provides a comprehensive stress analysis to guide the optimization of electrode structures.

show abstract

In Situ Stress Evolution in Li_1+xMn₂O₄Thin Films during Electrochemical Cycling in Li-Ion Cells

Cited by 31 publications

References 58 publications

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Modified Stoney Model and Optimization of Electrode Structure Based on Stress Characteristics

Contact Info

Product

Resources

About