To provide positive electrode active substance composed of lithium iron phosphoric acid compound demonstrating high capacity and output even when charging/recharging is repeatedly carried out, its manufacturing method, and a lithium ion secondary battery using the positive electrode active substance.
The positive electrode active substance is composed of lithium iron phosphoric acid compound of olivine structure expressed by a general formula Li1-xFe1-yMyPO4. The active substance is composed of deformed particles provided with a plurality of particle-like projections with particle diameters of 1 μm or less. Furthermore, the manufacturing method is for the positive electrode active substance provided with a material dispersing process and an annealing process. In the material dispersing process, material slurry is obtained by having phosphoric acid lithium compound, phosphoric acid iron (II) compound, and a compound containing metallic element M dispersed in a polar solvent. In the annealing process, the material slurry is heated. In addition, the lithium ion secondary battery uses the positive electrode substance composed of deformed particles provided with a plurality of particle-like projections with particle diameters of 1 μm or less on their surfaces.
SASAKI ITSUKI
OKUDA NARUAKI
HIRUTA OSAMU
TAKEUCHI YOJI
ITO YUICHI
UKIYOU YOSHIO
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Tamiwa Iwakura
Takahashi Shoki
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