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A kind of formation method of lithium manganate lithium ion battery
Active Publication Date: 2019-04-12
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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[0005] The purpose of the present invention is to provide a lithium manganate lithium ion battery formation method, which adopts step charging and flat pressing process to solve the technical problems of black spots and lithium analysis on the pole piece after formation in the prior art
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Embodiment 1
[0030] The process of preparing lithium manganate lithium ion battery in this embodiment includes battery formation, battery aging, battery sorting, battery packaging and battery capacity separation. The specific steps are as follows:
[0031] Make the above battery material into a 10Ah soft-pack battery, inject electrolyte, and perform formation: first charge the battery at a constant current rate of 0.02C for 300 minutes or the upper limit voltage to 3.60V, stop charging, and then flatten the battery. The pressure is 0.6MPa, and the flat pressing time is 2min; after flat pressing, charge the battery at a constant current rate of 0.12C for 240min or the voltage reaches 4.00V, and the formation is completed; then leave the battery for 2 to 3 hours, and wait for the voltage to stabilize , and then aged at 40°C for 48 hours, and selected batteries with a voltage ≥ 3.90V; for batteries with a voltage of 3.90V, it will be scrapped, if the voltage is ≥3.90V; vacuumize the qualified...
Embodiment 2
[0033] The process of preparing lithium manganate lithium ion battery in this embodiment includes battery formation, battery aging, battery sorting, battery packaging and battery capacity separation. The specific steps are as follows:
[0034]Make the above battery material into a 10Ah battery, inject electrolyte, and carry out formation; first charge the battery with a constant current of 0.03C for 360min or the upper limit voltage to 3.80V, stop charging, and then press the battery flat, flat pressure The voltage is 0.40Mpa, and the flat voltage time is 3min; after flat voltage, charge the battery with a constant current of 0.20C for 400min or the voltage reaches 4.00V, and the formation is completed; then leave the battery for 2~3h, wait for the voltage to stabilize, and then Place it in an environment of 50°C for 72 hours, and select batteries with a voltage ≥ 3.90V; for batteries with a voltage of < 3.90V, the battery needs to be formed, aged and sorted again. If the volta...
Embodiment 3
[0036] The process of preparing lithium manganate lithium ion battery in this embodiment includes battery formation, battery aging, battery sorting, battery packaging and battery capacity separation. The specific steps are as follows:
[0037] Make the above battery material into a 10Ah battery, inject electrolyte, and carry out formation; first, charge the battery with a constant current of 0.01C for 400 minutes or the upper limit voltage to 3.60V, stop charging, and then flatten the battery, flatten the pressure The voltage is 0.55Mpa, and the time for flat voltage is 1min; after flat voltage, charge the battery with a constant current of 0.10C for 500min or the voltage reaches 4.20V, and the formation is completed; then leave the battery for 2~3h, wait for the voltage to stabilize, and then Place it in an environment of 45°C for 60 hours of aging, and select batteries with a voltage ≥ 3.90V; for batteries with a voltage of < 3.90V, the battery needs to be formed, aged and so...
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Abstract
The invention relates to a formation method of a lithium manganate lithium ion battery, and belongs to the technical field of a lithium ion battery. The method comprises the following steps of performing more than two stages of stepped constant-current charging on the battery, wherein the current of each constant-current charging stage is larger than the current of a pervious constant-current charging stage adjacent to the constant-current charging stage; stopping charging the battery at a stage between adjacent two constant-current charging stages, and performing flat pressing on the battery; and performing flat pressing on a battery cell of the battery by a force so that a gas generated during formation can be timely discharged, lithium precipitation of a negative electrode is effectively reduced, and the formation effect of the battery is improved. The invention also discloses a preparation method of the lithium manganate lithium ion battery. With the adoption of the formation method in which a flat pressing process is added during the stepped charging process, the cycle performance of the prepared lithium manganate battery is obviously improved compared with a battery only employing stepped charging.
Description
technical field [0001] The invention relates to a method for forming a lithium manganate lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] At present, the first charging formation method of lithium-ion batteries is to charge the battery with a certain small current and constant current to 3.4V ~ 3.9V, then vacuum seal the battery, and then age the battery for 24h ~ 168h after sealing, and finally charge the battery at a constant current to 4.2V. The disadvantage of this method is that in the process of forming the solid electrolyte interfacial film (SEI film), certain side reactions will occur and harmful gases will be generated. The harmful gas cannot be discharged in time during the formation of the solid electrolyte interface, but exists between the pole piece and the diaphragm. When the voltage reaches 3.4V ~ 3.9V, the gas can only overflow when stored in a low-pressure environment. Therefore, before vacuuming...
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