METHOD FOR PRODUCING LITHIUM METAL COMPOSITE OXIDE

PROBLEM TO BE SOLVED: To provide a method for producing a lithium composite metal oxide capable of removing moisture and suppressing generation of nickel oxide.SOLUTION: There is provided a method for producing a lithium metal composite oxide containing at least nickel where lithium ions can be doped/dedoped, which comprises: a mixing step of mixing a metal composite compound containing at least nickel and a lithium compound to obtain a mixture; a calcination step of calcining the mixture in an oxygen-containing atmosphere to obtain a calcined product; a washing step of washing the calcined product to obtain a washed product; and a heat treatment step of heat-treating the washed product, in which in the mixing step, the mixing is performed so that the ratio (molar ratio) of lithium in the lithium compound to metal elements in the metal composite oxide exceeds 1 and the heat treatment step is performed at a rate of temperature increase of 100°C/hr or more and a retention temperature of more than 550°C and 900°C or less.SELECTED DRAWING: None 【課題】水分を除去し、かつ、酸化ニッケルの生成を抑制できるリチウム複合金属酸化物の製造方法の提供。【解決手段】リチウムイオンをドープ・脱ドープ可能な、少なくともニッケルを含むリチウム金属複合酸化物の製造方法であって、少なくともニッケルを含む金属複合化合物とリチウム化合物とを混合し、混合物を得る混合工程と、前記混合物を酸素含有雰囲気で焼成し、焼成物を得る焼成工程と、前記焼成物を洗浄し、洗浄物を得る洗浄工程と、前記洗浄物を熱処理する熱処理工程と、を有し、前記混合工程において、前記金属複合化合物中の金属元素に対する、前記リチウム化合物中のリチウムの比（モル比）が１を超える比率となるように混合し、前記熱処理工程を、昇温速度１００℃／ｈｒ以上、かつ、保持温度が５５０℃を超え、９００℃以下で行うことを特徴とするリチウム金属複合酸化物の製造方法。【選択図】なし