Fast- chargeable lithium- ion batteries by μ- Si anode- tailored full- cell design

• 成果类型: Article
• 署名作者: Lee, Taeyong; Seong, Min Ji; Ahn, Hyo Chul; Baek, Minsung; Park, Kiho; Oh, Jihoon; Choi, Taehoon; Choi, Jang Wook
• 署名单位: Seoul National University (SNU); Seoul National University (SNU)
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13878
• DOI: 10.1073/pnas.2417053121
• 发表日期: 2024-12-23
• 关键词: silicon; enables

摘要

Silicon (Si) anodes have long been recognized to significantly improve the energy density and fast- charging capability of lithium- ion batteries (LIBs). However, the implementation of these anodes in commercial LIB cells has progressed incrementally due to the immense volume change of Si across its full state- of- charge (SOC) range. Here, we report an anode- tailored full- cell design (ATFD), which incorporates micrometer- sized silicon (mu- Si) alone, for operation over a limited, prespecified SOC range identified as 30-70%. This range allows homogeneous (de)lithiation throughout the electrode, accompanied by an acceptable level of volume change. The ATFD-based cell exhibits 21.3% higher gravimetric energy density than that of its graphite- based counterpart in a commercial 18650 cylindrical cell and 84.6% capacity retention after 500 cycles even at a fast- charging rate of 3 C. This study indicates that the partial, intermediate SOC operation of the mu- Si anode can markedly increase the energy density and boost the fast- charging capability of a LIB cell, a challenging task in traditional cell engineering.