PRODUCTION METHOD FOR LITHIUM SECONDARY BATTERY POSITIVE ELECTRODE ACTIVE MATERIAL, LITHIUM SECONDARY BATTERY POSITIVE ELECTRODE ACTIVE MATERIAL, ELECTRODE, AND SOLID LITHIUM SECONDARY BATTERY

To provide a production method for a lithium secondary battery positive electrode active material that is high in coverage and less in generation of fine particles.SOLUTION: Provided is a production method for a lithium secondary battery positive electrode active material that includes a lithium metal composite oxide and a coating layer for coating at least a part of one particle of the lithium metal composite oxide. The production method includes a coating step for bringing the lithium metal composite oxide into contact with a coating liquid for forming the coating layer by using a coating device equipped with a two-fluid nozzle. The lithium metal composite oxide satisfies (A). The coating device jets each of the coating liquid and a high-pressure air flow from the coating device in the coating step, the high-pressure air flow satisfying (B).SELECTED DRAWING: None 【課題】被覆率が高く、微粒子の発生が少ないリチウム二次電池用正極活物質の製造方法の提供。【解決手段】リチウム金属複合酸化物と、前記リチウム金属複合酸化物の一粒子の少なくとも一部を被覆する被覆層と、を有するリチウム二次電池用正極活物質の製造方法であって、前記リチウム金属複合酸化物に、二流体ノズルを備える被覆装置を用いて、前記被覆層を形成するための被覆コート液を接触させる被覆工程を備え、前記リチウム金属複合酸化物は、（Ａ）を満たし、前記被覆工程は、前記被覆装置から、前記被覆コート液と高圧気流をそれぞれ噴射し、前記高圧気流は（Ｂ）を満たす、リチウム二次電池用正極活物質の製造方法。【選択図】なし