High Current Processing for Li-ion Batteries with Metal-Based Anodes
A lithium-ion battery, metal-based technology, used in lithium batteries, battery electrodes, batteries, etc., can solve problems such as battery failure, rapid capacity reduction, and lack of porosity.
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Embodiment 1
[0078] As schematically shown in Comparative Example 1, a standard assembly cycle was applied to the unit cell to fabricate a Li-ion battery. A high C-rate discharge current with a C-rate value of 7C was applied to the cells at intervals sufficient to set the charge level of the cells to 0%. Next, the cell is charged back to the 100% charge level. At this time, charging is performed with a C rate value of 1C at an interval sufficient for the SOC to reach 100%. As a result, with respect to the obtained battery, the rate performance inspection was performed continuously at intervals of 5C, 3C, 2C, 1C, 0.5C, and 0.1C in the order of 5C to 0.1C. Figure 6B Indicates rate performance. The negative electrode in this example is correlated with the C rate, showing a stable correlation of the discharge capacity maintenance rate. Figure 7B Shown is the result of scanning electron microscope analysis of the negative electrode at 100 magnifications. if with Figure 7A Compared with ...
Embodiment 2
[0080] As schematically shown in Comparative Example 1, a standard assembly cycle was applied to the unit cell to fabricate a Li-ion battery. A high C-rate current with a C-rate value of 3C is discharged to the unit cells at intervals sufficient to set the charge level of the unit cells to 0%. Next, the cell is charged back to the 100% charge level. At this time, charging is performed with a C rate value set to C / 20 at intervals sufficient for the SOC to reach 100%. As a result, as a result of continuous rate performance inspections of the obtained batteries in the order of 5C to 0.1C rates, the same cell performance as that shown in Example 1 was obtained.
Embodiment 3
[0082] As schematically shown in Comparative Example 1, a standard assembly cycle was applied to the unit cell to fabricate a Li-ion battery. An initial high C-rate discharge current with a C-rate value of 7C was applied to the cells at intervals sufficient to set the charge level of the cells to 0%. Next, the cell is charged back to the 100% charge level. At this time, charging is performed with a C rate value of 1C at an interval sufficient for the SOC to reach 100%. Then, a discharge current with a rate value of 5C was applied to the unit cell, and then a charge C rate value was applied with a value of 1C. Then, the discharge rate was set to 3C, 1C, and 0.1C, and the discharge process and the charge process were repeated over a plurality of cycles. As a result of continuously performing rate performance checks in the order of 5C to 0.1C rates for this unit cell, the same unit cell performance as that shown in Example 1 was obtained.
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