SILICON BASED LITHIUM ION BATTERY AND IMPROVED CYCLE LIFE OF SAME
Silicon-dominate battery electrodes, battery cells utilizing the silicon-dominate battery electrodes, and methods of manufacturing are disclosed. Such a battery cell includes a cathode, a separator, an electrolyte, and an anode. The anode comprises a current collector and active material on the current collector. The active material layer includes at least 50% silicon. A ratio of the electrolyte to Ah is over 2 g/Ah.
1 . A battery cell comprising:
a cathode;
a separator;
an electrolyte; and
an anode;
wherein the anode comprises a current collector and active material layer on the current collector;
wherein the active material layer comprises at least 50% silicon; and
wherein the electrolyte comprises 0.02 to 0.1 mL/cm 2 of the anode that participates in an electrochemical reaction.
2 . The battery cell of claim 1 , wherein the electrolyte comprises 0.005 to 0.05 mL/cm 2 of the anode that participates in an electrochemical reaction.
3 . The battery cell of claim 1 , wherein a ratio of the electrolyte to Ah for the battery cell is between 2 g/Ah and 10 g/Ah.
4 . The battery cell of claim 1 , wherein a ratio of the electrolyte to Ah is between 2 g/Ah and 5 g/Ah.
5 . The battery cell of claim 1 , wherein a ratio of the electrolyte to Ah is between 2.4 g/Ah and 10 g/Ah.
6 . The battery cell of claim 1 , wherein a ratio of the electrolyte to Ah is between 2.4 g/Ah and 5 g/Ah.
7 . The battery cell of claim 1 , wherein a porosity of the active material layer is less than 70%.
8 . The battery cell of claim 1 , wherein a porosity of the active material layer is less than 60%.
9 . The battery cell of claim 1 , wherein a porosity of the active material layer is less than 50%.
10 . The battery cell of claim 1 , wherein a porosity of the active material layer is less than 40%.
11 . The battery cell of claim 1 , wherein a porosity of the active material layer is less than 30%.
12 . The battery cell of claim 1 , wherein a second ratio of a thickness of the current collector to a thickness of the active material layer is greater than 0.5.
13 . The battery cell of claim 1 , wherein a second ratio of a thickness of the current collector to a thickness of the active material layer is greater than 0.66.
14 . The battery cell of claim 1 , wherein a second ratio of a thickness of the current collector to a porosity-adjusted active material layer thickness of the active material layer is greater than 0.25.
15 . The battery cell of claim 1 , wherein a second ratio of a thickness of the current collector to a porosity-adjusted active material layer thickness of the active material layer is greater than 0.33.
16 . The battery cell of claim 1 , wherein a second ratio of a thickness of the current collector to a porosity-adjusted active material layer thickness of the active material layer is greater than 0.5.
17 . The battery cell of claim 1 , wherein a second ratio of a thickness of the current collector to a porosity-adjusted active material layer thickness of the active material layer is greater than 0.6.
18 . The battery cell of claim 1 , wherein a second ratio of a thickness of the current collector to a porosity-adjusted active material layer thickness of the active material layer is greater than 1.
19 . The battery cell of claim 1 , wherein a second ratio of a thickness of the current collector to a porosity-adjusted active material layer thickness of the active material layer is greater than 1.3.
20 . The battery cell of claim 1 , wherein the active material layer further comprises a pyrolyzed binder.