A sulfide-based solid electrolyte particle having a crystal phase of a cubic argyrodite-type crystal structure composed of Li, P, S and a halogen (Ha. The proposed sulfide-based solid electrolyte particle has a feature such that the ratio (Z.sub.Ha2/Z.sub.Ha1) of an element ratio Z.sub.Ha2 of the halogen (Ha) at the position of 5 nm in depth from the particle surface to an element ratio Z.sub.Ha1 of the halogen (Ha) at the position of 100 nm in depth from the particle surface is 0.5 or lower, as measured by XPS; and the ratio (Z.sub.O2/Z.sub.A2) of an element ratio Z.sub.O2 of oxygen to the total Z.sub.A2 of element ratios of phosphorus (P), sulfur (S), oxygen (O) and the halogen (Ha) at the position of 5 nm in depth from the particle surface is 0.5 or higher, as measured by XPS.

The invention relates to lithium 1-trifluoromethoxy-1,2,2,2-tetra-fluoroethanesulphonate, the use of lithium 1-trifluoromethoxy-1,2,2,2-tetra-fluoroethanesulphonate as electrolyte salt in lithium-based energy stores and also ionic liquids comprising 1-trifluoro-methoxy-1,2,2,2-tetrafluoro-ethanesulphonate as anion.

The invention relates to lithium 1-trifluoromethoxy-1,2,2,2-tetra-fluoroethanesulphonate, the use of lithium 1-trifluoromethoxy-1,2,2,2-tetra-fluoroethanesulphonate as electrolyte salt in lithium-based energy stores and also ionic liquids comprising 1-trifluoro-methoxy-1,2,2,2-tetrafluoro-ethanesulphonate as anion.

A novel hydrogen absorption material is provided comprising a mixture of a lithium hydride with a fullerene. The subsequent reaction product provides for a hydrogen storage material which reversibly stores and releases hydrogen at temperatures of about 270° C.

A novel hydrogen absorption material is provided comprising a mixture of a lithium hydride with a fullerene. The subsequent reaction product provides for a hydrogen storage material which reversibly stores and releases hydrogen at temperatures of about 270° C.

A solid electrolyte includes a compound having an argyrodite crystal structure represented by Formula 1,
Li.sub.aM.sub.xPS.sub.bBr.sub.cX.sub.d.  Formula 1
wherein Formula 1, M is Na, K, Fe, Mg, Ca, Ag, Cu, Zr, Zn, or a combination thereof; X is Cl, I, or a combination thereof; and 0≤x<1, 5≤(a+x)<7, 5≤a≤6, 4≤b≤6, 0<(c+d)≤2, and (c/d)>4.

A solid electrolyte includes a compound having an argyrodite crystal structure represented by Formula 1,
Li.sub.aM.sub.xPS.sub.bBr.sub.cX.sub.d.  Formula 1
wherein Formula 1, M is Na, K, Fe, Mg, Ca, Ag, Cu, Zr, Zn, or a combination thereof; X is Cl, I, or a combination thereof; and 0≤x<1, 5≤(a+x)<7, 5≤a≤6, 4≤b≤6, 0<(c+d)≤2, and (c/d)>4.

A Li ion recovery member and a Li recovery device may prevent occurrence of breakage of a permselective membrane and implement stable Li ion recovery for a long period of time even when a size of a Li recovery device is increased. The Li ion recovery member may include: a permselective membrane including a Li ion conductor made of an inorganic substance; electrodes; and a reticular elastic body, in which the electrodes are provided on at least one main surface side of the permselective membrane, at least one electrode of the electrodes is a porous electrode or a membrane electrode, and the porous electrode or the membrane electrode is sandwiched between the reticular elastic body and the permselective membrane. The Li recovery device may include a Li ion recovery electrolytic cell including the Li ion recovery member and configured to recover Li ions by electrodialysis.

Disclosed are a secondary battery comprising a negative electrode composed of two or more negative electrode plates and a method of manufacturing the secondary battery, wherein each of the negative electrode plates includes a lithium by-product layer formed through pre-lithiation reaction on a negative electrode current collector coated with a negative electrode active material, wherein an inorganic substance layer is formed on a negative electrode tab that is extended from an end at one side of the negative electrode current collector and is composed of an active material-non-coated portion not coated with the negative electrode active material, and negative electrode tabs of the negative electrode plates are electrically connected with one negative electrode lead to form a negative electrode terminal.

A lithium-ion battery with high safety is provided. A lithium-ion battery 20 includes an electrode group 6, an electrolyte, and a battery container 5 that contains the electrode group 6 and the electrolyte. The electrode group 6 is formed by stacking a positive electrode and a negative electrode via a separator. The positive electrode contains a composite oxide of lithium, nickel, manganese, and cobalt as a main positive active material. The negative electrode contains amorphous carbon as a main negative active material. The lithium-ion battery 20 has a discharge capacity of 20 Ah or more. The ratio (the value of Y/X) of a volume Y occupied by the electrolyte to a volume X of a void space in the battery container 5 is 0.65 or more.