Compound having olivine-type structure, positive electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

具有橄榄石型结构的化合物、非水电解质二次电池用正极、非水电解质二次电池

Abstract

本发明提供可以制造高容量、高输出功率、速率特性优异的电池的具有橄榄石型结构的化合物,使用该化合物制造的非水电解质二次电池用正极,具有该正极的非水电解质二次电池。本发明的化合物是至少含有锂、过渡金属、磷和氧,具有橄榄石型结构,几乎不含有橄榄石型结构以外的晶相,比表面积为4m<sup>2</sup>/g以上的LiFePO<sub>4</sub>等的化合物,可以作为非水电解质二次电池用正极活性物质。
The invention discloses a compound having an olivine-type structure, which enables to produce a battery having high capacity, high output and excellent rate characteristics. Also disclosed are a positive electrode for nonaqueous electrolyte secondary batteries, which is produced by using such a compound, and a nonaqueous electrolyte secondary battery comprising such a positive electrode. Specifically disclosed is a compound containing at least lithium, a transition metal, phosphorus and oxygen, such as LiFePO4. The compound has an olivine-type structure and hardly contains a crystal phase other than one with olivine-type structure, while having a specific surface area of not less than 4 m<2>/g. This compound is useful as a positive electrode active material for nonaqueous electrolyte secondary batteries.

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    Publication numberPublication dateAssigneeTitle
    CN-103080000-AMay 01, 2013昭和电工株式会社锂金属磷酸盐的制造方法
    CN-103080000-BJune 10, 2015昭和电工株式会社Method for producing lithium metal phosphate