Anode active material and lithium-ion secondary battery and lithium-ion capacitor containing the same

Transparent Substrate Anode Promoting Lithium Intercalation via Photoelectric Effect of Photosensitive Materials

This technology involves forming an anode active material layer containing photosensitive materials such as TiO2, WO3, or PANI on a transparent conductive substrate. When exposed to light, the photoelectric effect increases conductivity and electron density, facilitating the intercalation of lithium ions and thereby enhancing battery capacity.

Conventional graphite-based anode active materials are limited by a theoretical capacity of approximately 372 mAh/g. While alloy-based anodes using Si or Sn have been explored to overcome this, they suffer from structural degradation and poor cycle performance due to volume expansion.

This technology utilizes a composition consisting of 80–90 wt% photosensitive material, 3–5 wt% conductive agent, and 5–15 wt% binder, applied to a transparent conductive substrate. The photo-charges generated by light energy assist in lithium-ion transport and increase charge-discharge capacity. It can be applied to self-charging power sources integrated with solar energy, transparent display-integrated batteries, and lithium-ion capacitors, enabling a new design approach that leverages external light as auxiliary energy to improve battery performance.

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Key Features:

• Lithium-ion secondary battery comprising a transparent conductive substrate and an anode active material layer formed thereon
• Anode active material layer containing 80 to 90 wt% of photosensitive material based on 100 wt% of the anode active material
• Anode active material composed of photosensitive material, 3 to 5 wt% of conductive agent, and 5 to 15 wt% of binder
• Lithium-ion capacitor equipped with an anode based on photosensitive materials including any one of titanium dioxide, tungsten oxide, or polyaniline

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