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Creators/Authors contains: "Ramasubramanian, Ajaykrishna"

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  1. ; ; ; ; (, Journal of Power Sources)
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  2. ; ; ; ; ; (, ACS Applied Energy Materials)
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  3. ; ; ; ; ; (, Journal of The Electrochemical Society)
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  4. ; ; ; ; ; (, The Journal of Physical Chemistry C)
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  5. ; ; ; ; ; ; (, International Journal of Solids and Structures)
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  6. ; ; ; ; (, MRS Communications)
    Abstract Lithium (Li) dendrite formation in Li-metal batteries (LMBs) remains a key obstacle preventing LMBs from their widespread application. This study focuses on the role of the stress field in the Li electrodeposits formation and growth. Coupled electrochemical and mechanical phase-field model (PFM) is used to investigate electrodeposited Li evolution under different conditions. The PFM results, using both the anisotropic elastic properties of Li and the random delivery of Li-ions through the solid electrolyte interface, show a significant local stress development indicating a direct correlation between the stress field and the origin of the undesired Li filaments initiation. 
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  7. ; ; ; ; ; ; ; ; ; ; et al (, Advanced Functional Materials)
    Abstract Proper distribution of thermally conductive nanomaterials in polymer batteries offers new opportunities to mitigate performance degradations associated with local hot spots and safety concerns in batteries. Herein, a direct ink writing (DIW) method is utilized to fabricate polyethylene oxide (PEO) composite polymers electrolytes (CPE) embedded with silane‐treated hexagonal boron nitride (S‐hBN) platelets and free of any volatile organic solvents. It is observed that the S‐hBN platelets are well aligned in the printed CPE during the DIW process. The in‐plane thermal conductivity of the printed CPE with the aligned S‐hBN platelets is 1.031 W−1K−1, which is about 1.7 times that of the pristine CPE with the randomly dispersed S‐hBN platelets (0.612 W−1K−1). Thermal imaging shows that the peak temperature (°C) of the printed electrolytes is 24.2% lower than that of the CPE without S‐hBN, and 10.6% lower than that of the CPE with the randomly dispersed S‐hBN, indicating a superior thermal transport property. Lithium‐ion half‐cells made with the printed CPE and LiFePO4cathode displayed high specific discharge capacity of 146.0 mAh g−1and stable Coulombic efficiency of 91% for 100 cycles at room temperature. This work facilitates the development of printable thermally‐conductive polymers for safer battery operations. 
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