I tried to make my own iron-air battery and charge and discharge it before.The problem was poor adhesion with the kitchen paper that divides the electrodes.
Binchotan is crushed into powder and hardened with glue or agar throughout both electrodes on both sides of the kitchen paper.The iron electrode is a sponge with iron powder deposited on it.I will try again with copper plate or sponge with copper powder deposited on the opposite electrode.
A coffee milling machine will be useful to crush the charcoal.For the glue, I will try gelatin, agar, arabic glue, wood glue, and salt water.
The sponge is 1 cm thick with large holes throughout.Cut and trim with scissors.
The iron source is disposable body warmer.
Copper source is copper sulfate.Or use a copper salt solution made by oxidizing and dissolving a copper plate in Sampol hydrochloric acid.
Charge-discharge and cycle characteristics are also measured.We have confirmed that the first three discharges are at a high voltage and current, and we would like to try more than 20 charge-discharge cycles.
Examine the weight and electric energy before and after charging and discharging.Measure the amount of electricity discharged in relation to the amount of electricity charged.
Use vinegar and salt as electrolyte.Add Sampol hydrochloric acid and measure the PH.Compare before and after charging/discharging and before and after cycle characteristic measurement.
We will also compare the battery characteristics when the electrolyte solution is shaken and the liquid flows in the electrolyte solution.
Install electrical wires in multiple locations to check electrical characteristics.Compare the electromotive force at each electrode position.
鉄空気電池の自作と充電と放電を以前試しました。電極を仕切るキッチンペーパーとの密着が悪いのが課題でした。
備長炭を砕いて粉にしてキッチンペーパーの両面の両電極全体を糊や寒天で固める。鉄電極はスポンジに鉄粉を析出させた物。対極を銅板かスポンジに銅粉を析出させた物で再度トライする予定。
炭を砕くのはコーヒーミルサーが役立ちそう。糊はゼラチン、寒天、アラビック糊、木工ボンドに食塩水を加えてみる。
スポンジは１センチ厚で全体の穴の大きなスポンジ。ハサミで切り整える。
鉄源は使い捨てカイロ。
銅源は硫酸銅。または銅板をサンポール塩酸のなかで酸化溶解させて作る銅塩の液を使う。
充放電特性、サイクル特性も測る。最初の３回ぐらいは高い電圧電流の放電が出来るのは確認できている。20回以上の充放電サイクルを試したい。
充放電前後の重量や電気量を調べる。充電電気量に対して放電電気量がどの程度か、を実測する。
電解液に食酢と食塩を使う。サンポール塩酸も追加してみる。PHも測る。充放電前後やサイクル特性測定前後で比べる。
また電解質液のなかで揺らして液をフローさせた時の電池特性も。
電気特性を調べるための電線を複数箇所に仕込んでおく。電極の位置ごとの起電力を比べる。