Abstract: A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, and having a composition represented by NaxSi136, wherein 1.98<x<2.54.

Abstract: The main object of the disclosure is to provide electrode active material Si particles that can inhibit fluctuation in constraining pressure of a battery during charge-discharge. The electrode active material Si particles have clathrate-type Si and diamond-type Si in the same particles. The electrode active material Si particles preferably comprise diamond-type Si at an area % of 0.05 to 11.00 with respect to the entire electrode active material Si particles. Preferably, the clathrate-type Si at least partially has a clathrate type II structure. The electrode active material Si particles preferably have a porous structure.

Abstract: Negative electrode active material particles of the present disclosure are Si particles with pores inside primary particles and having a clathrate type crystalline phase, and satisfying the following relationship: 0.061?V/W. Here, V is a volume of pores having a pore diameter of 10 nm or less and W is a half width of a peak at 2?=31.72°±0.50° in an X-ray diffraction test using CuK?.

Abstract: The present disclosure provides primarily a negative electrode active material with reduced volume change during charge-discharge. The negative electrode active material of the disclosure consists of clathrate-type Si particles comprising one or more metals selected from the group consisting of Mo, Fe, Zn, Mg, Pd, Zr, Ag, Co, Cr, Nb and V. A negative electrode active material layer according to the disclosure comprises the negative electrode active material of the disclosure, and a lithium-ion battery of the disclosure comprises the negative electrode active material layer of the disclosure.

Abstract: A negative electrode body of the present disclosure is a negative electrode body for a lithium ion battery having a negative electrode current collector layer and a negative electrode active material layer, wherein the negative electrode active material layer contains Si particles having a clathrate type structure as a negative electrode active material, wherein the negative electrode active material layer contains 0.850 mass % to 5.000 mass % of Al with respect to a mass of the negative electrode active material layer, and wherein the Si particles contain 0.040 mass % to 0.250 mass % of Al with respect to a mass of the Si particles.

Abstract: A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, including a void inside a primary particle, and a void amount of the void with a fine pore diameter of 100 nm or less is 0.05 cc/g or more and 0.15 cc/g or less.

Abstract: A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, including a void inside a primary particle, and a void amount of the void with a fine pore diameter of 100 nm or less is 0.05 cc/g or more and 0.15 cc/g or less.

Abstract: 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 NaxSi136 (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 cm3/g.

Abstract: A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, including a void inside a primary particle, and a void amount A of the void with a fine pore diameter of 100 nm or less is more than 0.15 cc/g and 0.40 cc/g or less.

Abstract: A method for manufacturing a negative electrode active material includes: an alloying step of causing an Na source and an Si source to react to produce an Na—Si alloy containing Na and Si; and a silicon clathrate production step of heating the Na—Si alloy and reducing an amount of Na in the Na—Si alloy to produce a type-II silicon clathrate. Porous Si with a BET specific surface area of 20 m2/g or more is used as the Si source.

Abstract: Provided is a novel production method for producing silicon clathrate II. In the production method for producing silicon clathrate II, in a reaction system in which a Na—Si alloy containing Na and Si and an Na getter agent coexist so as not to be in contact with each other, the Na—Si alloy is heated and Na evaporated from the Na—Si alloy is thus caused to react with the Na getter agent to reduce an amount of Na in the Na—Si alloy.

Abstract: A main object of the present disclosure is to provide an active material wherein the volume variation of an electrode layer during charge/discharge may be suppressed. The present disclosure achieves the object by providing an active material used for an all solid state battery, the active material comprising at least Si, and in infrared spectrum, when a maximum peak intensity in 900 cm?1 or more and 950 cm?1 or less is regarded as I1, and a maximum peak intensity in 1000 cm?1 or more and 1100 cm?1 or less is regarded as I2, the I1 and the I2 satisfy 0.55?I2/I1?1.0, and 0.01?I1.

Abstract: A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, and having a composition represented by NaxSi136, wherein 1.98<x<2.54.

Abstract: A main object of the present disclosure is to provide an active material wherein a volume variation due to charge/discharge is small. The present disclosure achieves the object by providing an active material comprising a silicon clathrate II type crystal phase, including a void inside a primary particle, and a void amount of the void with a fine pore diameter of 100 nm or less is 0.05 cc/g or more and 0.15 cc/g or less.

Abstract: 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 NaxSi136 (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 cm3/g.

Abstract: Provided is a novel production method for producing silicon clathrate II. In the production method for producing silicon clathrate II, in a reaction system in which a Na—Si alloy containing Na and Si and an Na getter agent coexist so as not to be in contact with each other, the Na—Si alloy is heated and Na evaporated from the Na—Si alloy is thus caused to react with the Na getter agent to reduce an amount of Na in the Na—Si alloy.

Abstract: A method for producing a silicon material, the method including: a step of heating CaSi2 powder in a range of 400 to 1000° C.; a step of reacting acid with the CaSi2 powder having been subjected to the step of heating CaSi2 powder in a range of 400 to 1000° C., to obtain a layered silicon compound; and a step of heating the layered silicon compound at not less than 300° C.

Abstract: An active material expressed by a general formula; LiaNibCocMndDeOf (where 0.2?“a”?1, “b”+“c”+“d”+“e”=1, 0?“e”<1, “D” is at least one element selected from the group consisting of Li, Fe, Cr, Cu, Zn, Ca, Mg, Zr, S, Si, Na, K and Al, and 1.7?“f”?2.1) includes a high manganese portion, which is made of a metallic oxide including Ni, Co and Mn at least and of which the composition ratio between Ni, Co and Mn is expressed by Ni:Co:Mn=b2:c2:d2 (note that “b2”+“c2”+“d2”=1, 0<“b2”<1, 0<“c2”<“c”, and “d”<“d2”<1), in a superficial layer thereof.

Abstract: A lithium composite metallic oxide expressed by: LiaNibCocMndDeOf (where 0.2?“a”?1.5, “b”+“c”+“d”+“e”=1, 0<“e”<1, “D” is at least one of the following elements: Fe, Cr, Cu, Zn, Ca, Mg, Zr, S, Si, Na, K, Al, Ti, P, Ga, Ge, V, Mo, Nb, W, La, Hf and Rf, and 1.7?“f”?2.1), and including: a high manganese portion, which is made of a metallic oxide including Ni, Co and Mn at least and of which the composition ratio between Ni, Co and Mn is expressed by Ni:Co:Mn=g:h:i (note that “g”+“h”+“i”=1, 0<“g”<1, 0<“h”<“c”, and “d”<“i”<1), in a superficial layer thereof; and a metallic oxidation portion in an outermost superficial layer of the high manganese portion.

Abstract: Provided is a method for producing a CaSi2-containing composition, the method including: a molten metal step of adding Ca and/or M (M is at least one element selected from elements of groups 3 to 9) to a CaSi2-containing composition containing crystalline silicon to prepare a molten metal containing Ca, M and Si that satisfy the following condition: when a molar ratio of Ca, M and Si is x:y:z (x+y+z=100), x, y and z satisfy 23<x?100/3, 0<y<10 and 64<z?200/3, respectively; and a cooling step of cooling the molten metal to obtain a CaSi2-containing composition containing a reduced amount of crystalline silicon.