Abstract

The application of three-dimensional collector and inorganic binder for silicon anodes was investigated with a view to raising the energy density of lithium-ion secondary batteries to a high level. In connection with testing, simulations with compact cells were conducted and confirmed the advantage over conventional electrodes in terms of energy density.The effectiveness of inorganic binder was confirmed using electrodes (density 0.05 g/cm3) fabricated with a loading mass of about 6.0 mg/cm2. It was found that the capacity retention of items without inorganic binder diminished to 25% or less up to the second cycle of the aging process, but the capacity retention of items that included inorganic binder was 78% at 50 cycles. Next, electrode pressing was carried out in order to raise the energy density to a high level. The electrodes obtained in this way (density 0.17 g/cm3 and 0.59 g/cm3) were used to perform the same kind of cycle testing, with the result that while the 0.17 g/cm3 item had the same capacity retention as the unpressed item, the capacity retention of the 0.59 g/cm3 item diminished to 46%. The results from cross-sectional observation of the electrode after testing showed that while the expansion and shrinking of the electrode had been successfully suppressed as anticipated, there were cracks between the interfaces of the composite layer and the collector foil, and the amount of that cracking was confirmed to be greater in the 0.59 g/cm3 item.

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Author (organization or company)

• Toshimitsu TANAKA（Innovative Research Excellence）
• Kiyoshi TANAAMI（Innovative Research Excellence）
• Yuji ISOGAI（Innovative Research Excellence）
• Takashi MUKAI（ATTACCATO Limited Liability Company）
• Yuta IKEUCHI（ATTACCATO Limited Liability Company）

Publication Information

Article of Honda R&D Technical Review Vol.34 No.1 (65 - 73)

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