摘要:
Provided is a negative electrode material for a lithium-ion secondary battery having a sufficient strength capable of exerting a certain resistance to the applied pressure to maintain the electrolytic solution flow path and maintain the non-parallel orientation of the flat graphite constituting the graphite particle spherical aggregates when pressed during electrode formation while being deformed such that the graphite particle spherical aggregates reach a certain density or more, and thus capable of increasing the electrode density and improving discharge capacity and excellent in cycle characteristics. A negative electrode material for a lithium-ion secondary battery contains a mass of graphite particle spherical aggregates in which a plurality of flat graphite particles are aggregated. The mass of the graphite particle spherical aggregates has an average circularity, D 90 /D 10 , and a crystallite size Lc (004) within a predetermined range, and the proportion of the graphite particle spherical aggregates in which the largest flat graphite particle observed on the outermost surface has a circle equivalent diameter of 2 µm to 12 µm in graphite particle spherical aggregates having a circle equivalent diameter of 10 µm or more when observed by SEM is 80% or more.
摘要:
Provided is a method for easily producing an oxidized carbon black aqueous dispersion that can highly remove multivalent metal ions and exhibit excellent dispersion stability. A method for producing an oxidized carbon black aqueous dispersion by successively performing on an aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof a neutralization step of mixing an alkali metal hydroxide and performing heating/neutralization in the presence of one or more selected from a water-soluble chelating agent and a salt thereof or after mixing an alkali metal hydroxide and performing heating/neutralization, mixing one or more selected from a water-soluble chelating agent and a salt thereof and a separation and removal step of separating and removing a multivalent metal ion chelate complex from a mixed solution obtained at the neutralization step using a separation membrane.
摘要:
A novel carbon black can improve rubber properties (e.g., degree of reinforcement and heat buildup). The carbon black has an aggregate void modal diameter Dmp determined by mercury porosimetry of 25 to 60 nm, and has a ratio (ΔDmp/modal diameter Dmp) of a half-width ΔDmp of an aggregate void diameter distribution determined by mercury porosimetry to the aggregate void modal diameter Dmp of 0.30 to 0.56.
摘要:
A negative electrode material for lithium secondary batteries includes carbon microspheres having an arithmetic mean particle diameter dn measured using an electron microscope of 150 to 1000 nm, a volatile content Vm of 5.0% or less, a ratio ΔDst/Dst (where, Dst indicates the Stokes mode diameter Dst measured using a disk centrifuge (DCF), and ΔDst indicates the half-width of the Stokes mode diameter Dst) of 0.40 to 1.10, and a lattice spacing (d002) measured by X-ray diffractometry of 0.370 nm or less. The negative electrode material is used for a high-output lithium secondary battery that has a high lithium ion doping-undoping speed and excellent cycle characteristics, and is suitable as a power supply for portable instruments, hybrid cars, electric vehicles, and the like.
摘要:
A granular carbonaceous heat insulator comprising a carbon black pellet the surface of which is coated with a carbon layer having a dense structure is disclosed. This heat insulator is prepared by adhering a binder solution to a carbon black pellet, heating the resulting coating to remove a solvent from the binder solution and, at the same time, to cure the binder, and baking the carbon black pellet coated with the cured binder in a non-oxidizing atmosphere to carbonize the cured binder. Alternatively, the heat insulator is prepared by subjecting a carbon black pellet having specific characteristics to wet granulation in the presence of a binder solution to crush the carbon black pellet and, at the same time, to granulate the crushed pellet, thereby preparing a granulated carbon black pellet, followed by removal of the solvent from the prepared pellet, curing of the binder and baking of the cured binder in the same manner as that described above.