On the direct correlation between the copper current collector surface area and ‘dead Li’ formation in zero-excess Li metal batteries

Adhitama, Egy; Refino, Andam Deatama; Brake, Tobias; Pleie, Jan; Schmidt, Christina; Demelash, Feleke; Neuhaus, Kerstin; Bornemann, Steffen; Wiemers‐Meyer, Simon; Peiner, Erwin; Winter, Martin; Wasisto, Hutomo Suryo; Placke, Tobias

doi:10.1039/d3ta00097d

Cited by 8 publications

(1 citation statement)

References 54 publications

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“…Through an insightful analysis of the correlation between surface area of 3D Cu current collectors and dead lithium, Adhitama et al elucidated the relationship between surface area and charge flux concentration, underlining the potential of larger surface areas to alleviate inhomogeneous lithium plating. 88 They compared three types of Cu current collectors (Fig. 12a) and found that the modified 3D Cu CC with a high-depth microstructure or large surface area can induce better electrochemical properties, displayed in Fig.…”

Section: Development Of Current Collectors Towards Homogeneity Of Lit...mentioning

confidence: 99%

Anode-free lithium metal batteries: a promising flexible energy storage system

Tang,

Tian,

Zhang

et al. 2024

J. Mater. Chem. A

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Section: Development Of Current Collectors Towards Homogeneity Of Lit...mentioning

confidence: 99%

Anode-free lithium metal batteries: a promising flexible energy storage system

Tang,

Tian,

Zhang

et al. 2024

J. Mater. Chem. A

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Assessing Key Issues Contributing to the Degradation of NCM‐622 || Cu Cells: Competition Between Transition Metal Dissolution and “Dead Li” Formation

Adhitama,

Demelash,

Brake

et al. 2024

Advanced Energy Materials

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Combining LiNixCoyMn1−x−yO2 (NCM) as cathode with bare Cu as anode will potentially lead to next‐generation batteries that are smaller, lighter, and can run for longer periods on a single charge. However, maintaining high performance and a long lifespan of NCM || Cu cells is challenging as it can be affected by various factors from both the cathode and the anode. From the cathode, it is well‐known that transition metal (TM) dissolution accelerates cell degradation. From the anode, one of the main challenges is the formation of high surface area Li deposits which later transform into “inactive Li” or “dead Li”. In this study, a comprehensive assessment regarding these competing factors (i.e., TM deposits and “dead Li”) is discussed. Accelerated TM dissolution is accomplished by introducing TM‐containing additives into the electrolyte. The effects of these competing factors and their degradation mechanism are studied quantitatively and qualitatively through inductively coupled plasma, i.e., optical emission spectroscopy and mass spectrometry. The “dead Li” influence is analyzed quantitatively using gas chromatography. The results demonstrate the obvious deleterious impact of dissolved TM ions on cell performance. At the same time, “dead Li” has also become a notable factor for a sudden capacity drop.

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Self‐Supporting Solid Electrolyte Based on Supramolecular Interaction for Stable Li Metal Batteries

Guan,

Xiao,

Bai

et al. 2024

Batteries & Supercaps

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Li metal batteries based on solid polymer electrolytes offer the benefits of high energy density and safety, as well as extended cycling life, making them an excellent candidate for the next‐generation battery system. However, current solid polymer electrolytes still suffer from low ion conductivity and Li+ transfer number, which seriously restricts its practical application. Herein, a self‐supporting composite solid polymer electrolyte was prepared, where phenolic resin rich in hydroxyl groups (BR) and polyethylene oxide (PEO) are mixed evenly and poured onto a cellulose membrane in one step. In such an electrolyte, PEO and BR combine to form intermolecular hydrogen bonds, lowering the crystallinity of PEO and increasing the Li+ transfer number. Lastly, the obtained solid electrolytes exhibited a high ion conductivity (1.1×10‐4 S cm‐1) and Li+ transfer number (0.53), as well as improved electrochemical window. Consequently, Li || Li symmetrical cells can run stably for more than 700 h at 0.1 mA cm‐2/0.25 mAh cm‐2. And full cells with LiFePO4 cathode can also demonstrate high discharge capacity of 152.12 mAh g‐1 and rate performance. We believe that such a design based on supramolecular interaction offer a new avenue to advanced solid polymer electrolytes.

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On the direct correlation between the copper current collector surface area and ‘dead Li’ formation in zero-excess Li metal batteries

Abstract: The direct correlation between the surface area of the current collector (CC) and the ‘dead Li’ is evaluated in this study.

Cited by 8 publications

References 54 publications

Anode-free lithium metal batteries: a promising flexible energy storage system

Anode-free lithium metal batteries: a promising flexible energy storage system

Assessing Key Issues Contributing to the Degradation of NCM‐622 || Cu Cells: Competition Between Transition Metal Dissolution and “Dead Li” Formation

Self‐Supporting Solid Electrolyte Based on Supramolecular Interaction for Stable Li Metal Batteries

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