Method for preparing lithium battery from garlic or onions

The invention discloses a method for preparing a lithium battery from garlic or onions. As the garlic and/or onions is/are used as a raw material, the method comprises the following steps: performing high-temperature carbonization on garlic and/or onion peel to obtain activated carbon used as an electrode conductive material; performing ethanol extraction on pulp of the garlic and/or onions to obtain essential oil used as an electrode binder and/or liquid-state electrolyte; performing further addition reaction between the essential oil and polymethyl hydrogen-containing siloxane to obtain modified polysiloxane used as a solid electrolyte material, or performing crosslinking curing to obtain a cured object used as an electrode active material; and adding one or more of the activated carbon, the essential oil, the modified siloxane and the cured object prepared from the raw material- the garlic and/or onions into other basic materials for preparing the lithium battery to obtain a solid-state or liquid-state lithium battery. The preparation method is simple and low in cost, the prepared lithium battery has the large capacity and the good cycle performance, and the selection range and application field of a lithium ion battery material are expanded.