LITHIUM SECONDARY BATTERY

To reduce the number of formation steps in a formation process of an electrode, and suppress destruction of the electrode, and provide a highly reliable lithium secondary battery by the suppression of destruction of the electrode.SOLUTION: In production of a negative electrode, graphene oxide, a plurality of particulate negative electrode active materials, and a precursor of polyimide are mixed to form slurry; the slurry is applied onto a negative electrode current collector; the slurry applied onto the negative electrode current collector is heated at a temperature from 200°C to 400°C inclusive, so that the precursor of the polyimide is imidized; and the heating to imidize the precursor of the polyimide reduces the graphene oxide. The invention also relates to production of a lithium secondary battery including the negative electrode.SELECTED DRAWING: Figure 1 【課題】電極作製工程において作製工程数を削減する、また当該電極の破壊を抑制する、また当該電極の破壊を抑制することにより、信頼性の高いリチウム二次電池を得る。【解決手段】酸化グラフェン、複数の粒子状の負極活物質、及びポリイミドの前駆体を混合して、スラリーを形成し、当該スラリーを負極集電体上に塗布し、当該負極集電体上に塗布されたスラリーを２００℃以上４００℃以下の温度で加熱して、当該ポリイミドの前駆体をイミド化し、当該ポリイミドの前駆体をイミド化するための加熱により、当該酸化グラフェンの還元を行う負極の作製、及び当該負極を有するリチウム二次電池の作製に関する。【選択図】図１