Abstract:
A negative electrode active material is provided for a lithium ion secondary battery having high initial charging/discharging efficiency. The negative electrode active material containing silicon and silicon oxide has two phases with different compositions therein. One of the two phases has a lower silicon element concentration than the other phase, and is a fibrous phase forming a network structure in a cross section of primary particle of the negative electrode active material. Use of the negative electrode active material enables a sufficient increase in initial charging/discharging efficiency.
Abstract:
A negative electrode active material with sufficiently high discharge capacity at a high rate, and a negative electrode and a lithium ion secondary battery using the negative electrode active material. A negative electrode active material according to the invention includes a negative electrode active material particle containing silicon and silicon oxide, wherein a surface layer part of the negative electrode active material particle is a layer with lower density than a core part of the negative electrode active material particle. With such a structure of the negative electrode active material, the sufficiently high discharge capacity at a high rate can be obtained.
Abstract:
A negative electrode active material mainly contains silicon and silicon oxide. In the negative electrode active material, an Ar-laser Raman spectrum thereof includes a peak A corresponding to 950±30 cm−1 and a peak B corresponding to 480±30 cm−1, and an intensity ratio of the peak B to the peak A (B/A) is in the range of 1 to 10.
Abstract:
A lithium ion secondary battery includes: a positive electrode including a positive electrode active material layer; a negative electrode; and an electrolyte. The positive electrode active material layer contains Lia(M)b(PO4)c (M=VO or V, 0.9≦a≦3.3, 0.9≦b≦2.2, 0.9≦c≦3.3) as a first positive electrode active material, and additionally contains a fluorine compound of 1 to 300 ppm in terms of fluorine with respect to a weight of the positive electrode active material layer.
Abstract:
Provided are a negative electrode active material for a lithium ion secondary battery, which has sufficiently high discharge capacity at a high rate. The negative electrode active material containing silicon and silicon oxide includes primary particles having two phases of different compositions therein. One of the two phases has a higher silicon element concentration than the other phase, and is a fibrous phase forming a network structure in a cross section of the primary particle. Use of the negative electrode active material enables a sufficient increase in discharge capacity at a high rate.
Abstract:
Provided is an all-solid lithium ion secondary battery including a sintered body including a solid electrolyte layer and a positive electrode layer and a negative electrode layer which are stacked alternately with the solid electrolyte layer interposed therebetween, wherein: the positive electrode layer, the negative electrode layer, and the solid electrolyte layer include a compound containing lithium and boron; and a content of lithium and boron contained in the compound to a total of a positive electrode active material included in the positive electrode layer, a negative electrode active material included in the negative electrode layer, and a solid electrolyte included in the solid electrolyte layer is respectively 4.38 mol % to 13.34 mol % in terms of Li2CO3 and 0.37 mol % to 1.11 mol % in terms of H3BO3.
Abstract translation:提供一种全固体锂离子二次电池,其包括:固体电解质层和正极层和负极层的烧结体,其间与固体电解质层交替堆叠,其中:正极层,负极 电极层,固体电解质层包括含有锂和硼的化合物; 所述化合物中含有的锂和硼的含量与正极层中所含的正极活性物质的总量,负极层中所含的负极活性物质和固体电解质层中含有的固体电解质的比例为 分别以Li 2 CO 3为4.38mol%至13.34mol%,以H3BO3计为0.37mol%至1.11mol%。
Abstract:
A positive electrode active material contains a compound represented by a chemical formula LiVOPO4. A crystal system of the compound is an orthorhombic system, and the amount of tetravalent V of the compound is 27.7 mass % or more and 28.2 mass % or less.
Abstract:
A nonaqueous electrolytic solution includes a cyclic carbonate and a chain carbonate, and contains a glycol sulfate derivative represented by formula (I) below and fluoroethylene carbonate: [wherein each of R1 and R2 independently represents at least one selected from the group consisting of a hydrogen atom and a hydrocarbon group having 1 to 5 carbon atoms].
Abstract:
A nonaqueous electrolyte for a lithium-ion secondary battery containing 0.1 ppm to 20 ppm of vanadium in terms of vanadium ions, and containing cyclic carbonate and chain carbonate is used.
Abstract:
The lithium-ion secondary battery in which a positive electrode contains Lia(M)b(PO4)cFd (M=VO or V, 0.9≦a≦3.3, 0.9≦b≦2.2, 0.9≦c≦3.3, 0≦d≦2.0) as an active material and 1 to 300 ppm of sulfur is used.
Abstract translation:其中正极含有Lia(M)b(PO4)cFd的锂离子二次电池(M = VO或V,0.9 @ a @ 3.3,0.9 @ b @ 2.2,0.9 @ c @ 3.3, 2.0)作为活性物质,使用1〜300ppm的硫。