COMPOSITE PARTICLE, MANUFACTURING METHOD THEREOF, ELECTRODE MATERIAL FOR SECONDARY BATTERY, AND SECONDARY BATTERY

• Main Authors: KAWASAKI TAKU, SAWAI TAKEHIKO, YOSHINO NOBUYUKI, URAO KAZUNORI, MURATA HIROSHI, SAITO SHINJI
• Format: Patent
• Language: English; Japanese
• Published: 06.09.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a positive electrode material for a highly safe lithium ion secondary battery that can charge and discharge a large current while having long service life.SOLUTION: A composite particle comprises: one or more carbon materials selected from the group consisting of (i) a fibrous carbon material, (ii) a chain-like carbon material, and (iii) a carbon material produced by linking together a fibrous carbon material and a chain-like carbon material; and lithium-containing phosphate. At least one fine pore originating from the one or more carbon materials selected from the group is a fine pore that opens to the outside of the composite particle, and the fine pore that opens to the outside of the composite particle has a diameter of 0.5-12 nm.SELECTED DRAWING: None 【課題】安全性が高く、大電流充放電が可能で、しかも長寿命なリチウムイオン二次電池用正極材料の提供。【解決手段】（i）繊維状炭素材料、(ii)鎖状炭素材料、および（iii）繊維状炭素材料と鎖状炭素材料とが相互に連結してなる炭素材料からなる群より選ばれた１種以上の炭素材料と、リチウム含有リン酸塩を含む複合粒子であり、前記の群より選ばれた１種以上の炭素材料を起点とした細孔の少なくとも一つが複合粒子外へ通じる細孔であり、前記複合粒子外へ通じる細孔の径が０．５〜１２ｎｍである複合粒子。【選択図】なし