Carbonaceous electrode material for secondary battery and process for production thereof
First Claim
1. A carbonaceous electrode material for a secondary battery, using a non-aqueous electrolyte solution comprising a carbonaceous material characterized by providing an electrochemically lithium-doped product showing a main resonance peak which is shifted by 80-200 ppm to a lower magnetic field side from a resonance line of LiCl as a reference substance when subjected to 7 Li-NMR spectroscopy analysis.
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Accused Products
Abstract
A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent-type secondary battery, is constituted by a carbonaceous material having a specific microtexture. The carbonaceous material is characterized by it'"'"'s ability to provide an electrochemically lithium-doped product showing a main resonance peak which is shifted by 80-200 ppm to a lower magnetic field side from a resonance line of LiCl as a reference substance when subjected to 7 Li-NMR spectroscopy analysis.
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Citations
10 Claims
- 1. A carbonaceous electrode material for a secondary battery, using a non-aqueous electrolyte solution comprising a carbonaceous material characterized by providing an electrochemically lithium-doped product showing a main resonance peak which is shifted by 80-200 ppm to a lower magnetic field side from a resonance line of LiCl as a reference substance when subjected to 7 Li-NMR spectroscopy analysis.
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5. A process for producing a carbonaceous electrode material for a secondary battery using a non-aqueous electrolytic solution, comprising the steps of:
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crosslinking a tar or pitch of a petroleum or coal origin with a polyfunctional vinyl polymer in the presence of a radical initiator, and carbonizing the crosslinked tar or pitch at a temperature of 900°
-1500°
C. under a reduced pressure of at most 10 kPa, so as to provide a carbonaceous material characterized by providing an electrochemically lithium-doped product showing a main resonance peak which is shifted by 80-200 ppm to a lower magnetic field side from a resonance line of LiCl as a reference substance when subjected to 7 Li-NMR spectroscopy.
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6. A process for producing a carbonaceous electrode material for a secondary battery, using a non-aqueous electrolyte solution comprising:
carbonizing coconut shell at a temperature of 900°
-1500°
C. under a reduced pressure of at most 10 kPa, so as to provide a carbonaceous material characterized by providing an electrochemically lithium-doped product showing a main resonance peak which is shifted by 80-200 ppm to a lower magnetic field side from a resonance line of LiCl as a reference substance when subjected to 7 Li-NMR spectroscopy.
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10. A process for producing a carbonaceous electrode material for a secondary battery, using a non-aqueous electrolyte solution comprising the steps of:
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crosslinking a tar or pitch of a petroleum or coal origin, and carbonizing the crosslinked tar or pitch at a temperature of 900°
-1500°
C. under a reduced pressure of at most 10 kPa, so as to provide a carbonaceous material characterized by providing an electrochemically lithium-doped product showing a main resonance peak which is shifted by 80-200 ppm to a lower magnetic field side from a resonance line of LiCl as a reference substance when subjected to 7 Li-NMR spectroscopy;said crosslinking being carried out through the steps of; mixing the pitch with an additive comprising an aromatic compound having two or three aromatic rings and a boiling point of at least 200°
C. to form a shaped pitch product,extracting the additive from the shaped pitch product with a solvent showing a low dissolving power to the pitch and a high dissolving power to the additive, thereby leaving a porous pitch product, and oxidizing the porous pitch product.
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Specification