With a view to constructing a resource circulation system for lithium ion batteries, we attempted to recover lithium and cobalt ions by hydrothermal citric acid leaching into water. Under reaction conditions in the range of 100–200°C, 5–30 min, and 0.1–1.0 M citric acid, leaching efficiency of lithium and cobalt was found to increase with reaction temperature, time and citric acid concentration, and recovery of both metals exceeded 80%. To elucidate the reaction mechanism, leaching rate constants of lithium and cobalt were calculated based on the unreacted core or shrinking core model. It was found that the leaching behavior was expressed by the product layer controlled model in the unreacted core model, and the leaching rate constants of lithium and cobalt are approximately linearly dependent on the proton concentration.
"},{"@language":"ja","@value":"リチウムイオン電池を対象とした資源循環システムの構築を目的とし，正極材料であるLiCoO2からLiおよびCoを回収する湿式精錬プロセスにおいて，反応挙動の把握とそのメカニズム解明を図った．LiCoO2 1 wt%，0.1–1.0 Mクエン酸水溶液を100–200°Cの水熱条件で，反応時間5–30 minにて処理を行い，クエン酸濃度，反応温度，反応時間の影響について検討した．クエン酸濃度，反応温度の増大と共にLiおよびCoの浸出率は増大し，クエン酸濃度0.5 M, 150°C, 30 minの条件で80%以上の浸出率を得た．反応機構を解明すべく，固体–流体間の反応モデル，すなわち未反応核もしくは収縮核モデルを用いて反応メカニズムに関する考察を行うとともに，実験結果を良好に再現した反応モデルにより速度定数を求めた．その結果，LiおよびCoの水熱クエン酸浸出反応はいずれも生成物層拡散律速であり，速度定数はいずれも反応場のプロトン濃度のおよそ1次に依存した．
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