Lithium ion secondary battery
AssigneeNEC Corporation
InventorTakeshi AZAMI
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Abstract
A lithium ion secondary battery having more improved cycle characteristics is provided. The present invention relates to a lithium ion secondary battery having a negative electrode comprising a graphite and a silicon oxide having a composition represented by SiOx (0<x≤2), wherein AG/AS is within a range of 0.6 or more and 1.6 or less when a particle number average aspect ratio of the graphite is defined as AG and a particle number average aspect ratio of the silicon oxide is defined as AS.
Claims6
A lithium ion secondary battery having a negative electrode comprising a graphite and a silicon oxide having a composition represented by SiOx (0<x≤2), wherein AG/AS is within a range of 0.6 or more and 1.8 or less when a particle number average aspect ratio of the graphite is defined as AG and a particle number average aspect ratio of the silicon oxide is defined as AS.
(canceled)
A method of producing a secondary battery comprising:
- a step of stacking a positive electrode and a negative electrode via a separator to produce an electrode element and
- a step of enclosing the electrode element and an electrolyte solution in an outer package, wherein
- the negative electrode comprises a graphite and a silicon oxide having a composition represented by SiOx (0<x≤2), and AG/AS is within a range of 0.6 or more and 1.6 or less when a particle number average aspect ratio of the graphite is defined as AG and a particle number average aspect ratio of the silicon oxide is defined as AS.
Dependencies are inferred from the claim text.