Carbonaceous electrode and compatible electrolyte solvent
First Claim
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1. An electrochemical cell which comprises a first electrode, a counter electrode which forms an electrochemical couple with said first electrode, and an electrolyte:
- a. said first electrode consisting essentially of graphite particles and a binder, where on the basis of 100 parts by weight, said binder constitutes up to about 15 parts and said graphite particles constitute at least about 85 parts;
said graphite particles having an interlayer distance spacing of 002 planes (d002) as determined by x-ray diffraction of 0.330 to 0.340 nanometers (nm), a crystallite size in the direction of c-axis (Lc) being at least about 90 nanometers (nm) and less than about 1000 nanometers (nm), a BET surface area of greater than about 4 square meters per gram (m2 /g) and up to about 16 square meters per gram (m2 /g), and at least 90 percent by weight of said graphite particles having a size less than 25 microns (μ
m); and
said electrolyte comprising a solute and a solvent mixture;
said solute consisting essentially of a salt of a metal;
said solvent mixture consisting essentially of propylene carbonate (PC), vinylene carbonate (VC) or a substituted derivative thereof, and optionally one or more other organic solvents;
with the propylene carbonate being present in an amount by weight which is not greater than the combined amount of said vinylene carbonate or its derivative and any said other solvent.
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Abstract
A battery which comprises a first electrode and a counter electrode which forms an electrochemical couple with the first electrode, and an electrolyte. The first electrode comprises graphite particles and the electrolyte comprises a solvent mixture and a solute. The solvent mixture comprises vinylene carbonate (VC) or substituted derivatives thereof and propylene carbonate (PC).
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Citations
25 Claims
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1. An electrochemical cell which comprises a first electrode, a counter electrode which forms an electrochemical couple with said first electrode, and an electrolyte:
a. said first electrode consisting essentially of graphite particles and a binder, where on the basis of 100 parts by weight, said binder constitutes up to about 15 parts and said graphite particles constitute at least about 85 parts;
said graphite particles having an interlayer distance spacing of 002 planes (d002) as determined by x-ray diffraction of 0.330 to 0.340 nanometers (nm), a crystallite size in the direction of c-axis (Lc) being at least about 90 nanometers (nm) and less than about 1000 nanometers (nm), a BET surface area of greater than about 4 square meters per gram (m2 /g) and up to about 16 square meters per gram (m2 /g), and at least 90 percent by weight of said graphite particles having a size less than 25 microns (μ
m); and
said electrolyte comprising a solute and a solvent mixture;
said solute consisting essentially of a salt of a metal;
said solvent mixture consisting essentially of propylene carbonate (PC), vinylene carbonate (VC) or a substituted derivative thereof, and optionally one or more other organic solvents;
with the propylene carbonate being present in an amount by weight which is not greater than the combined amount of said vinylene carbonate or its derivative and any said other solvent.- View Dependent Claims (2, 3, 4, 5)
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6. An electrochemical cell which comprises a first electrode, a counter electrode which forms an electrochemical couple with said first electrode, and an electrolyte;
- said first electrode comprising graphite particles, and said electrolyte comprising a solvent mixture and a solute;
said solvent mixture comprising vinylene carbonate (VC) or a substituted derivative thereof and propylene carbonate (PC). - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- said first electrode comprising graphite particles, and said electrolyte comprising a solvent mixture and a solute;
Specification