47results about How to "Raise the discharge potential" patented technology

A power storage device including a positive electrode in which a positive electrode active material is formed over a positive electrode current collector and a negative electrode which faces the positive electrode with an electrolyte interposed therebetween is provided. The positive electrode active material includes a first region which includes a compound containing lithium and one or more of manganese, cobalt, and nickel; and a second region which covers the first region and includes a compound containing lithium and iron. Since a superficial portion of the positive electrode active material includes the second region containing iron, an energy barrier when lithium is inserted into and extracted from the surface of the positive electrode active material can be decreased.

A F-type electrochemical cell, which is a lithium air battery, includes a positive electrode facing a negative electrode composed of metallic lithium with a separator provided therebetween in a casing. Air is capable of flow to the positive electrode. A nonaqueous electrolytic solution is charged into a space between the positive electrode and the negative electrode. At least one of the positive electrode and the nonaqueous electrolytic solution of the lithium air battery contains a compound having a stable radical skeleton. The compound also serves as a redox catalyst for oxygen.

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.

The invention provides a preparation method of a lithium ion battery cathode. The active substances of the cathode comprise a first active substance, a second active substance and a third active substance, the first active substance is LiNi0. 8Co0. 1Mn0. 1O2, and D50 is 1.5-1.7 [mu] m; the second active substance is LiNi0. 4Co0. 3Mn0. 3O2, and the D50 is 600 to 650 nm; the third active substance is LiCo0. 5Mn0. 47Al0. 03O2, and D50 is 2.5 to 2.8 [mu] m. The preparation method comprises the steps of preparing the first active substance, the second active substance and the third active substanceinto the first slurry, the second slurry and the third slurry respectively, then mixing the first slurry and the second slurry in proportion to obtain the fourth slurry, and mixing the second slurryand the third slurry in proportion to obtain the fifth slurry; coating and drying the first slurry, the fourth slurry, the second slurry, the fifth slurry and the third slurry in sequence to obtain acathode active material layer, and then coating the surface of the active material layer with a nano Al2O3 passivation layer to obtain the battery cathode. The cathode prepared by the preparation method of the invention has the relatively higher high-temperature rate capability and high-temperature cycle performance.

The invention relates to a Cu<2+>, Ce<4+>, Ag<+> doping modified iron fluoride positive pole material and a preparation method thereof. The method comprises the following step: performing ball milling on copper salt, cerium salt, silver salt and synthesis raw materials in a high-energy ball mill for a certain time, and performing heat treatment to obtain the FeF3 positive pole material. The Cu<2+> partially occupies iron ions of FeF3 for coordination, thereby being beneficial to increase the discharge potential and improve the energy density; the high-valence Ce<4+> is doped, thereby being beneficial to increase the specific capacity of the material; and the Ag<2+> is doped, thereby reducing the conversion reaction activation energy during charge. Thus, the invention is beneficial to improve the rate characteristic and energy density, thereby improving the comprehensive electrochemical property of the material.