发明名称 |
POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES AND MANUFACTURING METHOD THEREOF, AND LITHIUM SECONDARY BATTERY ARRANGED BY USE OF SUCH POSITIVE ELECTRODE ACTIVE MATERIAL |
摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lithium secondary battery having both of a high level of safety and a high capacity and superior in cycle life by use of a fine and high-performance positive electrode active material for lithium secondary batteries which can offer a high capacity, and to provide a precursor used to obtain the positive electrode active material for lithium secondary batteries and a manufacturing method thereof, and a manufacturing method thereof suitable for industrial production.SOLUTION: A positive electrode active material for lithium secondary batteries comprises a metal lithium silicate salt expressed by the general formula, LiMSiO(1.90≤x≤2.15; 0.90≤y≤1.10; and M is at least one element selected from Mn, Fe, Ni and Co). The positive electrode active material includes: metal lithium silicate salt particles consisting of primary particles and secondary particles composed of agglomerations of the primary particles. The primary particles have diameters of 10-300 nm according to measurement by SEM observation. The positive electrode active material has a specific surface area of 25-35 m/g, and a carbon content of 3-7 mass%. Contact faces through which the metal lithium silicate salt particles contact an electrolyte are at least partially covered with a carbonaceous material having conductivity.</p> |
申请公布号 |
JP2014082219(A) |
申请公布日期 |
2014.05.08 |
申请号 |
JP20140015302 |
申请日期 |
2014.01.30 |
申请人 |
SUMITOMO METAL MINING CO LTD |
发明人 |
IKEUCHI KENJI;OSAKO TOSHIYUKI |
分类号 |
H01M4/58;C01B33/32;H01M4/36 |
主分类号 |
H01M4/58 |
代理机构 |
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代理人 |
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地址 |
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