Lithium-ion battery
AssigneeMotorola, Inc.
InventorsZhenhua Mao, Anaba Anani
Life of this patent
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Abstract
An improved lithium-ion or lithium-polymer battery that is capacity-fade resistant. The battery includes an anode comprised of graphite where density of the graphite is in a range from 1.2 to 1.5 g/c3; and the battery further has a cathode that is comprised of LiNiO2 present at a density in a range from 3.0 to 3.3 g/c3. The battery also includes an electrolyte and a separator between the anode and cathode, and the separator is coated with PVDF such that the anode, cathode, and separator are held together to form the electricity-producing battery. The ratio by weight of LiNiO2 to graphite present in the battery is preferably no greater than 2.0 to 1.
Claims7
A lithium-ion battery, the battery comprising:
- an anode comprised of at least carbon and has a density being in a range from 1.2 to 1.5 g/cm3, wherein the anode comprises a microbead graphite present in a range from 30-70% by weight, and a first amount of flake-shaped graphite present in a range from 30-70% by weight;
- a cathode comprised of LiNiO2, the cathode density being in a range from 3.0 to 3.3 g/cm3, wherein the cathode is comprised of LiNiO2 present in a range of 89-93% by weight, carbon black present at 0.5-3% by weight, a second amount of flake-shaped graphite present at 2-5% by weight, and PVDF present in a range of 2-6% by weight;
- an electrolyte;
- and
- a separator between the anode and cathode, the separator coated with PVDF such that the anode, cathode, and separator are held together,
- wherein the ratio by weight of active LiNiO2 to active carbon present in the battery cathode and anode respectively is no greater than 2.0 to 1.
A lithium-ion battery, the battery comprising:
- an anode;
- a cathode;
- an electrolyte;
- and
- a separator between the anode and cathode, the separator coated with PVDF such that the anode, cathode, and separator are held together;
- wherein the anode is comprised of a first amount of graphite present in a range of 30-70% by weight, and PVDF present in a range of 4-15% by weight;
- further wherein the first amount of graphite comprises microbead graphite present in a range from 30-70% by weight, and a first amount of flake-shaped graphite present in a range from 30-70% by weight;
- and
- wherein the cathode is comprised of LiNiO2 present in a range of 89-93% by weight, carbon black present at 0.5-3% by weight, a second amount of flake-shaped graphite present at 2-5% by weight, and PVDF present in a range of 2-6% by weight.
Dependencies are inferred from the claim text.