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US 8,557,437 B2Granted
Electrode comprising protective layer for lithium ion secondary battery and lithium ion secondary battery
AssigneeTDK Corporation
InventorsKiyonori Hinoki, Kazutoshi Emoto, Haruka Nishimura, Masahiro Saegusa
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Abstract
An electrode for a lithium ion secondary battery having a collector, an active-material layer formed on the collector and a protecting layer formed on the active-material layer, in which the protecting layer contains an organic particle formed of poly(methyl methacrylate) having a crosslinked structure, and the organic particle has an average particle size (D50) of 0.5 to 4.0 μm.
Claims7
An electrode for a lithium ion secondary battery comprising:
- a collector,
- an active-material layer formed on the collector, and
- a protecting layer formed on the active-material layer,
- wherein:
- the protecting layer contains a low-melting point organic particle having a melting temperature of 100 to 200° C. and an average particle size (D50) of 0.10 to 4.0 μm, and a high-melting point organic particle having a melting temperature of 300° C. or more and an average particle size (D50) of 0.30 to 6.0 μm,
- a ratio of the average particle size (D50) of the low-melting point organic particle to the average particle size (D50) of the high-melting point organic particle is 1:1.5 to 1:8, and
- a ratio of a content of the low-melting point organic particle relative to a content of the high-melting point organic particle in the protecting layer is 1:1 to 1:4, in terms of mass.
4 more elements
A lithium ion secondary battery comprising a positive electrode and a negative electrode, wherein:
- at least one of the positive electrode and the negative electrode is an electrode having a collector, an active-material layer formed on the collector, and a protecting layer formed on the active-material layer,
- the protecting layer contains a low-melting point organic particle having a melting temperature of 100 to 200° C. and an average particle size (D50) of 0.10 to 4.0 μm, and a high-melting point organic particle having a melting temperature of 300° C. or more and an average particle size (D50) of 0.30 to 6.0 μm,
- a ratio of the average particle size (D50) of the low-melting point organic particle to the average particle size (D50) of the high-melting point organic particle is 1:1.5 to 1:8, and
- a ratio of a content of the low-melting point organic particle relative to a content of the high-melting point organic particle in the protecting layer is 1:1 to 1:4, in terms of mass.
1 more element
Dependencies are inferred from the claim text.