Heat-sensitive layer for lithium ion secondary battery
AssigneeZeon Corporation
InventorsHiroki Oguro, Kouichirou Maeda, Naoki Takahashi
Life of this patent
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Abstract
Provided is a heat-sensitive layer for a lithium ion secondary battery that can efficiently block rising temperature during abnormal heating by increasing battery internal resistance and thereby reducing current. The heat-sensitive layer for a lithium ion secondary battery is formed from a heat-sensitive layer composition containing particles in each of which a second component is substantially partially disposed at the outside of a particle formed from a first component. The heat-sensitive layer composition has a storage modulus at 60° C. of 10 kPa or more and a storage modulus at 150° C. of 1 kPa or less.
Claims7
A heat-sensitive layer for a lithium ion secondary battery comprising:
- a heat-sensitive layer composition having a particle;
- the particle having a core and a shell;
- the core being composed of a first polymer having a melting point of at least 60° C.;
- the shell being composed of a second polymer, the second polymer being different from the first polymer, and the second polymer having a glass transition temperature of not higher than 20° C.;
- and wherein,
- the shell is disposed at an exterior of the core such that the core is not completely covered by the shell, wherein the core and the shell are exposed to an exterior of the particle;
- and wherein
- the heat-sensitive layer composition has a storage modulus at 60° C. of 10 kPa or more, and
- the heat-sensitive layer composition has a storage modulus at 150° C. of 1 kPa or less.
Dependencies are inferred from the claim text.