Lithium secondary battery and method for manufacturing thereof
First Claim
1. A lithium secondary battery comprising an electrode and a nonaqueous electrolyte, the electrode comprising an active material layer provided on a current collector and containing an active material which is capable of electrochemically occluding and releasing lithium and having cracks formed in the layer by occlusion and releasing of lithium, the cracks of the active material layer being filled with the nonaqueous electrolyte in the form of a solid electrolyte.
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Accused Products
Abstract
A lithium secondary battery comprising an electrode in which an active material layer which includes an active material that electrochemically occludes and releases lithium is formed on a current collector, wherein cracks are formed in the active material layer by occlusion and release of lithium ions and thereafter a solid electrolyte is formed in the cracks in the active material layer.
91 Citations
19 Claims
- 1. A lithium secondary battery comprising an electrode and a nonaqueous electrolyte, the electrode comprising an active material layer provided on a current collector and containing an active material which is capable of electrochemically occluding and releasing lithium and having cracks formed in the layer by occlusion and releasing of lithium, the cracks of the active material layer being filled with the nonaqueous electrolyte in the form of a solid electrolyte.
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17. A method for manufacturing a lithium secondary battery comprising a nonaqueous electrolyte and an electrode on which an active material layer containing an active material capable of electrochemically occluding and releasing lithium is formed on a current collector, wherein cracks which are formed in the active material layer by occlusion and release of lithium are filled with a solid electrolyte, comprising:
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preparing a temporary-battery comprising the electrode and the electrolyte comprising a lithium salt;
forming cracks in the active material layer by charging and discharging the temporary-battery;
adding a polymerizable monomer to the electrolyte in the temporary-battery and polymerizing the monomer to form the solid electrolyte and to fill the cracks with the solid electrolyte.
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18. A lithium secondary battery comprising an electrode and a nonaqueous electrolyte, the electrode comprising an active material layer formed on a current collector by deposition of an active material which is capable of electrochemically occluding and releasing lithium and having cracks formed in the layer by occlusion and releasing of lithium, the cracks of the active material layer being filled with the nonaqueous electrolyte in the form of a solid electrolyte.
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19. A method for manufacturing a lithium secondary battery comprising a nonaqueous electrolyte and an electrode on which an active material layer containing an active material capable of electrochemically occluding and releasing lithium is formed as a thin film on a current collector, wherein cracks which are formed in the active material layer by occlusion and release of lithium are filled with a solid electrolyte, comprising:
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preparing a temporary-battery comprising the electrode in which an active material layer containing an active material capable of electrochemically occluding and releasing lithium is formed by depositing a thin film of the active material on a current collector, and the electrolyte comprising a lithium salt;
forming cracks in the active material layer by charging and discharging the temporary-battery;
adding a polymerizable monomer to the electrolyte in the temporary-battery and polymerizing the monomer to form the solid electrolyte and to fill the cracks with the solid electrolyte.
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Specification