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Lithium ion battery with mixed negative electrode and formation and grading method thereof

A lithium-ion battery and negative electrode technology, which is applied in the field of lithium-ion batteries and their composition and capacity, can solve the problems that the advantages of mixed negative electrodes cannot be fully utilized, the working voltage of lithium titanate batteries is low, and lithium-ion batteries are difficult to apply, so as to prevent Excessive loss of electrolyte, tight fit, and the effect of taking into account the characteristics of use

Active Publication Date: 2021-01-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high lithium intercalation potential of the lithium titanate negative electrode also causes the low working voltage and low energy density of the lithium titanate battery.
The lithium-ion battery made of graphite and lithium carbonate mixed negative electrode has the advantages of both, but it is different from a single negative electrode material in that there are two charging and discharging platforms in the charging and discharging process. For lithium-ion batteries composed of negative electrodes, one working platform is about 3.65V, and the other platform is about 2.2V. The usual composition and capacity method is difficult to apply to lithium-ion batteries composed of mixed negative electrodes, and cannot give full play to the advantages of mixed negative electrodes, resulting in battery performance degradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A ternary battery with a capacity of 6Ah, the positive electrode is nickel-cobalt lithium manganese oxide, the negative electrode is a mixed negative electrode of graphite and lithium titanate, electrolyte and lithium salt, the electrolyte includes ethylene carbonate and dimethyl carbonate, and the lithium salt is lithium hexafluorophosphate . The mixing ratio of negative electrode graphite and lithium titanate is 90 / 10.

[0032] (1) First charge the battery to 1.5V with a constant current of 0.01C;

[0033] (2) Adjust the current and charge it to 2.2V with a constant current of 0.02C, and charge it at a constant voltage of 2.2V until the cut-off current is 0.03C;

[0034] (3) The negative pressure of the battery is pumped for 0.5h, which is the same as the negative pressure pumping in the prior art, and turned into a negative pressure of -40kPa, and then left to stand for 4h;

[0035] (4) Adjust the current and charge it to 3.0V with a constant current of 0.03C;

[...

Embodiment 2

[0045] A ternary battery with a capacity of 6Ah, the positive electrode is nickel-cobalt lithium manganese oxide, the negative electrode is a mixed negative electrode of graphite and lithium titanate, electrolyte and lithium salt, the electrolyte includes ethylene carbonate and dimethyl carbonate, and the lithium salt is lithium hexafluorophosphate . The mixing ratio of negative electrode graphite and lithium titanate is 80 / 20.

[0046] (1) First charge the battery to 1.5V with a constant current of 0.02C;

[0047] (2) Adjust the current and charge it to 2.2V with a constant current of 0.03C, and charge it at a constant voltage of 2.2V until the cut-off current is 0.05C;

[0048] (3) The negative pressure of the battery is pumped for 1 hour, turned into a negative pressure of -40kPa, and then left to stand for 4 hours;

[0049] (4) Adjust the current and charge it to 3.0V with a constant current of 0.04C;

[0050] (5) Adjust the current and charge it to 3.5V with a constant...

Embodiment 3

[0059] A ternary battery with a capacity of 6Ah, the positive electrode is nickel-cobalt lithium manganese oxide, the negative electrode is a mixed negative electrode of graphite and lithium titanate, electrolyte and lithium salt, the electrolyte includes ethylene carbonate and dimethyl carbonate, and the lithium salt is lithium hexafluorophosphate . The mixing ratio of negative electrode graphite and lithium titanate is 70 / 30.

[0060] (1) First charge the battery to 1.5V with a constant current of 0.01C;

[0061] (2) Adjust the current and charge it to 2.2V with a constant current of 0.03C, and charge it at a constant voltage of 2.2V until the cut-off current is 0.05C;

[0062] (3) Pump the negative pressure of the battery for 0.5h, turn it into a negative pressure of -40kPa, and then let it stand for 4h;

[0063] (4) Adjust the current and charge it to 3.0V with a constant current of 0.05C;

[0064] (5) Adjust the current and charge it to 3.5V with a constant current of 0....

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Abstract

The invention discloses a lithium ion battery with a mixed negative electrode and a formation and grading method of the lithium ion battery. The negative electrode of the lithium ion battery is prepared by mixing graphite and lithium carbonate. The lithium ion battery prepared from the graphite and lithium carbonate mixed negative electrode has the advantages of the graphite and lithium carbonatemixed negative electrode, but different from a single negative electrode material, the lithium ion battery has two charging and discharging platforms in the charging and discharging process, a commonformation and capacity grading mode is difficult to apply to the lithium ion battery composed of the mixed negative electrode, and the advantages of the mixed negative electrode cannot be brought intofull play. According to the formation and grading method for the lithium ion battery with the mixed negative electrode, a stepped formation mode is adopted, the characteristics of the two materials of the mixed negative electrode are considered, a stable SEI film can be formed on the surface of the graphite negative electrode, and meanwhile, a relatively high lithium intercalation potential of lithium carbonate is considered, so the capacity and the cycle characteristic of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery with a mixed negative electrode and a composition and capacity method thereof. Background technique [0002] At present, the commercialized lithium-ion negative electrodes are mainly graphite and lithium titanate. Graphite will form an SEI film on the surface when it is charged and discharged for the first time, resulting in irreversible capacity loss, and because the lithium intercalation potential is close to that of metal lithium, low temperature and overcharge are easy. The formation of lithium dendrites raises safety concerns. Compared with graphite negative electrode, lithium titanate has higher lithium intercalation potential, higher safety, excellent low temperature performance, cycle stability and fast charging ability. However, the high lithium intercalation potential of the lithium titanate negative electrode also results in low operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/583H01M4/131H01M4/133H01M10/0525H01M10/058
CPCH01M4/485H01M4/583H01M4/133H01M4/131H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 刘春丽吴诺刘京生
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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