Non-aqueous electrolyte secondary battery including separator with masking region inhibiting permeation of lithium ions
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorYukihiro Oki
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Abstract
This non-electrolyte secondary battery comprises: a positive electrode which has a positive electrode mixture layer including a positive electrode active material; a negative electrode which has a negative electrode mixture layer including a negative electrode active material; and a separator which is disposed between facing surfaces of the positive electrode and the negative electrode, and through which lithium ions pass. The separator is provided with a masking region in which fine pores are sealed with paraffin to prevent the lithium ions from passing therethrough.
Claims3
A non-aqueous electrolyte secondary battery, including:
- a positive electrode having a positive electrode mixture layer including a positive electrode active material;
- a negative electrode having a negative electrode mixture layer including a negative electrode active material;
- and
- a separator formed in a band shape and interposed between opposite surfaces of the positive electrode and the negative electrode and being permeable to lithium ions, wherein
- a masking region inhibiting permeation of lithium ions is provided on the separator to restrict release of lithium ions from the negative electrode mixture layer during discharge,
- the masking region is formed by sealing pores of the separator with paraffin permeated into the pores, and
- the masking region comprises one or both of:
- (i) one or more continuous masking regions each extending from one longitudinal end to an other longitudinal end of the separator, at least one of the one or more continuous masking regions passing through a center part distanced in a width direction of the separator from an end part in the width direction of the separator;
- and
- (ii) a plurality of discrete masking regions disposed between the one and the other longitudinal ends of the separator, wherein at least one of the discrete masking regions is spaced away from each of the one and the other longitudinal ends of the separator.
Dependencies are inferred from the claim text.