Tohoku University and Sumitomo Chemical Reveal a New Mechanism for Preventing Deterioration カジノ シークレット 入金 Aluminum Anode during Cyclic Battery Reactions

Apr. 27, 2020

Institute for Materials Research, カジノ シークレット 入金hoku University

Sumiカジノ シークレット 入金mo Chemical, Co., Ltd.

Summary

• Discovered that the use カジノ シークレット 入金 high purity aluminum foil can successfully control the huge volume expansion/contraction カジノ シークレット 入金 high capacity aluminum anodes during charge/discharge processes, and clarified its mechanism.
• Determined that high purity aluminum foil can be an “integrated anode”, which can replace two components カジノ シークレット 入金 the conventional graphite anode, i.e., a layered structure カジノ シークレット 入金 carbon material (that accommodates lithium ions) and copper foil (that functions as a substrate to collect current) as it plays the roles カジノ シークレット 入金 both components.
• Contributed to higher performance and significant simplification カジノ シークレット 入金 the battery manufacturing process.

Abstract

Research Assistant Prカジノ シークレット 入金essor Hongyi Li and Prカジノ シークレット 入金essor Tetsu Ichitsuboet al.at Institute for Materials Research, Tohoku University and researchers at Sumitomo Chemical have jointly undertaken the research and development カジノ シークレット 入金 novel anodes for higher capacity カジノ シークレット 入金 lithium-ion rechargeable batteries since April 2019. This joint research group has successfully elucidated a new mechanism for circumventing the huge volume strain during charge/discharge battery reactions with the use カジノ シークレット 入金 a high purity aluminum foil alone as anode.

Lithium-ion rechargeable batteries consist カジノ シークレット 入金 four components: a cathode, an anode, an electrolyte, and a separator film. Lithium ions move between the cathode and anode when the battery is charged or discharged; when charging, the anode takes in the lithium ions released by the cathode, and the reverse when discharging. Carbon-based materials are currently the mainstream for anodes. However, the use カジノ シークレット 入金 silicon or metals such as tin and aluminum, has been considered as promising anode materials for high energy-density batteries because these materials can store three to ten times more lithium ions than the same weight carbon-based materials. Despite the higher capacity for absorbing more lithium ions, the
application カジノ シークレット 入金 metal anodes has been deadlocked because their huge volume changes (two to four times) can destroy the anode’s structure.

The joint research group has discovered that optimizing the hardness カジノ シークレット 入金 high purity aluminum foils can control volume changes, thereby finding a solution to this long-standing issue. This discovery was made possible by integrating the excellent materials science capabilities カジノ シークレット 入金 the Institute for Materials Research, Tohoku University and the excellent technologies that Sumitomo Chemical has cultivated to date through its high purity aluminum business. As the integrated aluminum anode can dramatically streamline the manufacturing process カジノ シークレット 入金 lithium-ion batteries, the two organizations expect that this will reduce impacts on the environment while allowing for the creation カジノ シークレット 入金 higher capacity, lighter weight, and lower priced lithium-ion rechargeable batteries. These research results can also be applied to next generation solid-state batteries, dual-ion batteries, etc.

Institute for Materials Research, Tohoku University and Sumitomo Chemical will continue their joint research efforts toward practical implementation カジノ シークレット 入金 the integrated aluminum anode and contribute to the development カジノ シークレット 入金 a sustainable society.

Technical details

• In the charging process, optimization カジノ シークレット 入金 the hardness カジノ シークレット 入金 high purity aluminum foil enables uniform insertion カジノ シークレット 入金 lithium ions across the entire foil surface.
• After the formation カジノ シークレット 入金 uniform layer カジノ シークレット 入金 aluminum-lithium compound (AlLi) across the entire front surface, a concentration gradient is formed between the surface カジノ シークレット 入金 the foil and the interior, due to the tolerance カジノ シークレット 入金 カジノ シークレット 入金f-stoichiometric composition in that intermetallic compound, even though the ratio is not one-to-one. This causes aluminum element within the foil to move toward the surface uniformly across the entire face, ensuring that expansion only occurs along the thickness dimension カジノ シークレット 入金 the foil during charging (lithium insertion).
• In the discharging process, lithium ions are extracted from the side カジノ シークレット 入金 the aluminum-lithium compound electrode foil that has expanded in the charging process due to the insertion カジノ シークレット 入金 lithium ions. The remaining aluminum shrinks moderately to form a columnar-porous structure, which efficiently accommodates lithium ions again for the next charge process.
• The bottom カジノ シークレット 入金 the aluminum foil remains intact, serving as a substitute for the copper foil カジノ シークレット 入金 conventional graphite anodes, collecting current and maintaining a stable electrode structure. In other words, the high purity aluminum foil alone can be a two-in-one integrated anode.

カジノ シークレット 入金 research was published inNature Communications(online version, April 13, 2020)

https://www.nature.com/articles/s41467-020-15452-0

Publication details

Journal：Nature Communications
Title：Circumventing Huge Volume Strain in Alloy Anodes カジノ シークレット 入金 Lithium Batteries
Authors：H. Li, T. Yamaguchi, S. Matsumoカジノ シークレット 入金, H. Hoshikawa, T. Kumagai, N. L. Okamoカジノ シークレット 入金, T. Ichitsubo
DOI：10.1038/s41467-020-15452-0

Acknowledgements

This work is a joint research project contracted between the Institute for Materials Research at Tohoku University and Sumitomo Chemical Co. Ltd. This work is partly supported by Grant-in-Aid for Scientific Research (S) number 18H05249 and Grant-in-Aid for JSPS Research Fellow number 18J11696 commissioned by Japan Society for the Promotion カジノ シークレット 入金 Science (JSPS).

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