Precharge method of lithium ion batteries
A lithium-ion battery and pre-charging technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor low-temperature performance of the battery cell, unsatisfactory charging effect, and unsolved polarization problems, so as to achieve good electrical performance, eliminate the problem of uneven charging, Effect of Shortening Precharge Time
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[0020] Example 1:
[0021] The positive and negative pole pieces and separator made of lithium cobaltate as the positive electrode active material and graphite as the negative electrode active material are laminated or wound into bare cells, and then the cells are packed into the packaging shell and placed inside Inject 1mol / L LiPF 6 / (EC+PC+DEC) electrolyte to make a battery. The volume ratio of ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC) is 1:1:1. Put the prepared battery into two plates and apply a pressure of 0.8Mpa, and charge it with 0.5C current for 15min at an ambient temperature of 45°C. The pre-charge amount is 12.5% of the total battery capacity, and an SEI film is formed on the surface of the negative electrode. Then vacuum package, and then carry out capacity and cycle test. The test content is shown in Table 1.
Example Embodiment
[0022] Example 2:
[0023] The positive and negative pole pieces and separator made of lithium cobaltate as the positive electrode active material and graphite as the negative electrode active material are laminated or wound into bare cells, and then the cells are packed into the packaging shell and placed inside Inject 1mol / L LiPF 6 / (EC+PC+DEC) electrolyte to make a battery. The volume ratio of ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC) is 1:1:1. Put the prepared battery into two plates and apply a pressure of 1.2Mpa, and charge it with 0.3C current for 30min at an ambient temperature of 23°C. The pre-charged amount is 15% of the total battery capacity. SEI film is formed on the surface of the negative electrode. Then vacuum package, and then carry out capacity and cycle test. The test content is shown in Table 1.
Example Embodiment
[0024] Example 3:
[0025] The positive and negative pole pieces and the separator made of lithium manganate as the positive electrode active material and graphite as the negative electrode active material are laminated or wound into bare cells, and then the cells are packed into the packaging shell and placed inside. Inject 1mol / L LiPF 6 / (EC+PC+DEC) electrolyte to make a battery. The volume ratio of ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC) is 1:1:1. Put the prepared battery into two plates and apply a pressure of 0.01Mpa, and charge it with 0.05C current for 120min at an ambient temperature of 10°C. The pre-charged amount is 10% of the total battery capacity. SEI film is formed on the surface of the negative electrode. Then vacuum package, and then carry out capacity and cycle test. The test content is shown in Table 1.
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