The results are listed in Table 1.Regarding the product phase of the lithium sulfide powders thus obtained, in Examples 1, 2 and 4 to 9, only the peaks attributable to lithium sulfide (LiFurthermore, regarding the Li/S molar ratio of lithium sulfide thus obtained, it was found that in Examples 1, 2 and 4 to 9, nearly stoichiometric compositions were achieved. When the concentration of the S-containing gas is 10 vol % or more, the contact reaction with lithium carbonate occurs sufficiently, lithium sulfide can be produced, and the presence of residual lithium carbonate can be prevented. A lithium ion battery comprising the solid electrolyte according to claim 11.15. 9 27
Provided is a method for producing lithium sulfide based on a new dry method, by which lithium sulfide can be produced more easily at lower cost, and fine pulverization of lithium sulfide can be attempted. 0000003766 00000 n
A lithium ion battery comprising the solid electrolyte according to claim 13. 0000005359 00000 n
This compares with Li-ion batteries which are only used across 80% (or less) of their available discharge range. By regulating the particle size of lithium carbonate powder as a raw material, the particle size of lithium sulfide (LiIn order to obtain finely particulate lithium sulfide having an average particle size (DMore specifically, for example, when lithium carbonate powder having an average particle size (DExamples of the S-containing gas include hydrogen sulfide gas (HMeanwhile, when lithium carbonate is decomposed, lithium oxide (LiThe reaction between lithium carbonate and the S-containing gas is a dry reaction (solid-gas reaction). Sulfur) and high energy density (less material required for same energy). 0000000836 00000 n
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In other words, it is a method of bringing solid lithium carbonate into contact with a gas in a dry state and thereby causing lithium carbonate and the gas to react, without using a solvent such as water.Furthermore, the reaction formula in the case of using CSWhen the S-containing gas is supplied while lithium carbonate is heated, lithium carbonate is decomposed and reacts with the S-containing gas. Provided is a method for producing lithium sulfide based on a new dry method, by which lithium sulfide can be produced more easily at lower cost, and fine pulverization of lithium sulfide can be attempted. Thanks to its two key mechanisms, a ceramic lithium sulfide passivation layer and a non-flammable electrolyte, our cells can withstand extreme abuse situations such as bullet and nail penetrations with no adverse reaction. The method for producing lithium sulfide (Li2S) according to claim 1, wherein the lithium carbonate powder is heated to a temperature equal to or higher than the temperature at which lithium carbonate is decomposed, and to a temperature range at which lithium carbonate does not melt.3. From the results of this analysis, the average particle size (DFor the samples obtained in Examples 1 to 9, the product phase was measured by an X-ray diffraction method, and the Li/S molar ratio and the purity were measured by an ICP emission analysis method, while the carbon concentration was measured by a combustion-infrared absorption method. A carbon paste was applied on the upper and lower surfaces of the pellet as electrodes, and then the pellet was subjected to a heat treatment for 30 minutes at 180° C. Thus, a sample for ion conductivity measurement was produced. Lithium/sulfur rechargeable batteries offer a remarkably large capacity for energy storage, mainly because two electrons are produced each time a molecule is processed through the battery's chemistry.