Positive electrode material and battery using the same
AssigneeSony Corporation
InventorGuohua Li
Life of this patent
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Abstract
The invention provides a positive electrode material and a battery using the same which can achieve a higher discharge voltage and which can obtain excellent charge-and-discharge properties, without reducing the capacity. A positive electrode (12) and a negative electrode (14) are configured through a separator (15) in between. The positive electrode (12) contains a compound expressed by a general formula Li1+xMnyFezPO4 (wherein x, y and z are values within ranges of 0<x<0.1, 0.5<y<0.95, and 0.9<y+z≦1, respectively). According to the compound, the higher discharge voltage can be obtained due to Mn, the Jahn Teller effect of Mn3+ can be attenuated and furthermore distortion of the crystal structure and the reduction of the capacity can be inhibited due to Fe and the excess Li.
Claims15
A positive electrode material containing a compound expressed by a general formula Li1+xMnyFezPO4 (wherein x, y and z are values within ranges of 0<x<0.1, 0.5<y<0.95, and 0.9<y+z≦1, respectively).
A battery comprising an electrolyte as well as a positive electrode and a negative electrode, wherein the positive electrode contains a compound expressed by a general formula Li1+xMnyFezPO4 (wherein x, y and z are values within ranges of 0<x≦0.1, 0.5<y<0.95, and 0.9<y+z<1, respectively).
A battery comprising an electrolyte as well as a positive electrode and a negative electrode, wherein the positive electrode contains a compound containing excess lithium and expressed by a general formula Li1+xMnyFezPO4, with x, y, and z being values within the ranges of 0<x≦0.1, 0.5<y<0.95, and 0.9<y+z<1, respectively,
- wherein,
- the negative electrode contains at least one material selected from the group consisting of lithium metals, lithium alloys, and a material capable of insertion and extraction of lithium, and
- the electrolyte contains at least one material selected from the group consisting of LiPF6, LiClO4, LiAsF6, LiBF4, LiCF3SO3 and LiN(CF3SO2)2.
A positive electrode material containing (a) an olivine compound having excess lithium, the olivine compound being expressed by general formula Li1+xMnyFezPO4, wherein x, y, and z are values within the ranges of 0<x<0.1, 0.5<y<0.95, and 0.9<y+z<1, respectively;
- and (b) LiCoO2, LiNiO2, LiMnO2, LiMn2O4, a lithium sulfide, or a polymeric material.
A battery comprising an electrolyte as well as a positive electrode and a negative electrode, wherein the positive electrode contains (a) a compound containing excess lithium and expressed by general formula Li1+xMnyFezPO4, with x, y, and z being values within the ranges of 0<x≦0.1, 0.5<y<0.95, and 0.9<y+z<1, respectively;
- and (b) (b) LiCoO2, LiNiO2, LiMnO2, LiMn2O4, a lithium sulfide, or a polymeric material.
Dependencies are inferred from the claim text.