Titles:
Silicon composite negative electrode material, preparation method thereof and lithium ion battery
一种硅复合物负极材料及其制备方法和锂离子电池
Abstracts:
The invention provides a silicon composite negative electrode material, a preparation method thereof, and a lithium ion battery. The silicon composite negative electrode material includes silicon, silicon oxide, and silicate, and the cation of the silicate is a cation of the M element. The method includes: condensing silicon source vapor and M element-containing vapor at 700-900° C. under vacuum to obtain the silicon composite negative electrode material. The preparation method provided by the present invention significantly improves the uniformity of the element distribution in the silicon composite anode material by controlling the condensation degree within a specific range, and the compactness of the deposited body after condensation is also better, due to the distribution The uniformity avoids the occurrence of other side reactions, and the final prepared material has excellent cycle performance.
Title:
Electroactive materials for use in metal-Ion batteries
Abstract:
A particulate material consists of a plurality of composite particles, wherein the composite particles comprise: (a) a conductive porous particle framework including micropores and/or mesopores having a total pore volume between 0.4 - 2.2 cm3/g; (b) a plurality of electroactive material domains disposed within the conductive porous particle framework; and (c) a lithium-ion permeable filler penetrating the pores of the porous conductive particle framework and disposed intermediate the electroactive material and the exterior of the composite particles. The electroactive material may comprise Si, Sn, Ge and/or Al, and preferably comprises Si nanoscale domains. The conductive porous particles are preferably carbon but may comprise porous metal oxides (e.g. titanium oxide) instead. Preferably, the PD50 pore diameter of the porous particle framework is no more than 10 nm. The filler may be a conductive pyrolytic carbon material or a Li-ion permeable solid electrolyte. The filler may also comprise a coating over at least part of the outer surface of the composite particles. The composite particles are preferably used as an anode material in a rechargeable metal-ion battery.
Applicant:
NEXEON LTD [GB]
Inventors:
CHARLES A MASON [GB]
RICHARD GREGORY TAYLOR [GB]
Titles:
NEGATIVE ELECTRODE ACTIVE SUBSTANCE, NEGATIVE ELECTRODE, AND METHODS FOR PRODUCING THESE
負極活物質、負極及びそれらの製造方法
Abstracts:
The present invention is a negative electrode active substance which contains negative electrode active substance particles, and which is characterized in that the negative electrode active substance particles contain silicon compound particles that contain a silicon compound, the silicon compound particles contain Li2SiO3, at least a part of the surface of the silicon compound particles is covered with a carbon layer, and a surface layer of the negative electrode active substance particles includes a substance having a carboxylic acid structure. Provided by this configuration is a negative electrode active substance capable of increasing battery capacity due to improved initial efficiency and capable of realizing satisfactory battery cycle characteristics.
