A lithium secondary battery is disclosed herein. In some embodiments, a lithium secondary battery which includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution, wherein the positive electrode includes a positive electrode active material represented by Formula 1, and the non-aqueous electrolyte solution includes a non-aqueous organic solvent, a first lithium salt, lithium bis(fluorosulfonyl)imide as a second lithium salt, and an additive, wherein a molar ratio of the first lithium salt to the second lithium salt is in a range of 1:0.01 to 1:1, and the additive is a mixed additive which includes fluorobenzene, tetravinylsilane, and tertiary butylbenzene in a weight ratio of 1:0.05:0.1 to 1:1:1.5.
Li(Ni.sub.aCo.sub.bMn.sub.c)O.sub.2  [Formula 1] (in Formula 1, 0.65<a≤0.9, 0.05≤b<0.2, 0.05≤c<0.2, and a+b+c=1.)

Novel, rechargeable magnesium/magnesium sulfide batteries are disclosed therein, having energy density competitive with lithium batteries, high cycle life, land lower cost. Production method of stabilized MgS is also described, as well as various cells' constructions.

A novel electrode is provided. A novel power storage device is provided. A conductor having a sheet-like shape is provided. The conductor has a thickness of greater than or equal to 800 nm and less than or equal to 20 μm. The area of the conductor is greater than or equal to 25 mm.sup.2 and less than or equal to 10 m.sup.2. The conductor includes carbon and oxygen. The conductor includes carbon at a concentration of higher than 80 atomic % and oxygen at a concentration of higher than or equal to 2 atomic % and lower than or equal to 20 atomic %.

The present invention relates to a silicon powder, where the size of the silicon powder particles are between 3 and 30 μm, a particle size fraction D10 of the silicon powder particles is between 3 and 9 μm, and where the silicon powder particles have no, or substantially no, silicon particles with a size smaller than D10 attached to the surface. The silicon powder according to the present invention is produced by wet classifying produced silicon powders.

Provided is a negative electrode active material that contains silicon clathrate II and that is suitable for a negative electrode of a lithium ion secondary battery. The negative electrode active material includes a silicon material in which silicon clathrate II represented by composition formula Na.sub.xSi.sub.136 (0≤x≤10) is contained and a volume of a pore having a diameter of not greater than 100 nm is not less than 0.025 cm.sup.3/g.

A flexible secondary battery includes: a first electrode including a first electrode current collector extended longitudinally, a first electrode active material layer formed on the outside of the first electrode current collector, and a first insulation coating layer formed on the outside of the first electrode active material layer; and a second electrode including a second electrode current collector extended longitudinally, a second electrode active material layer formed on the outside of the second electrode current collector, and a second insulation coating layer formed on the outside of the second electrode active material layer, wherein the first electrode and the second electrode are wound in such a manner that they are disposed alternately in contact with each other.

The present application provides a negative electrode plate, a secondary battery, a battery module, a battery pack, and a power consuming device. The negative electrode plate may include a main body region and at least one low-thermal-conductivity edge region; and the low-thermal-conductivity edge region and the main body region respectively may have thermal conductivities of λ.sub.2 and λ.sub.1, where λ.sub.2<λ.sub.1.

A positive electrode active material precursor is provided, which includes a transition metal hydroxide particle represented by Formula 1 and a cobalt oxide particle and a manganese oxide particle attached to the surface of the transition metal hydroxide particle. A preparation method thereof, a positive electrode active material prepared using the same, a positive electrode including the positive electrode active material, and a secondary battery including the positive electrode are also provided.

A method of manufacturing a secondary battery including a joining step of clamping a negative electrode core body stacked part and a negative electrode current collector by a horn and an anvil, and in a state where the anvil is in contact with the negative electrode current collector, ultrasonically joining the negative electrode core body stacked part and the negative electrode current collector to form a joint part; and an oxidation treatment step of oxidizing a portion, in contact with the anvil, of the negative electrode current collector in the joining step.

An all-solid secondary battery includes a cathode layer; an anode layer; and a solid electrolyte layer disposed between the cathode layer and the anode layer. The cathode layer includes a cathode current collector and a cathode active material layer disposed on the cathode current collector, the anode layer includes an anode current collector and a first anode active material layer disposed on the anode current collector, the cathode active material layer includes a porous oxide-based composite solid electrolyte, and the solid electrolyte layer includes a sulfide-based solid electrolyte.