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A kind of formation method of lithium-nickel-based composite compound battery

A chemical synthesis method and compound technology, which are applied in the field of chemical formation of lithium-nickel-based composite compound batteries, can solve problems such as poor stability, affect safety performance, and battery bulging, and achieve the effects of improving high temperature stability, improving cycle performance, and avoiding decomposition.

Active Publication Date: 2021-11-30
江苏中奕和创智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-nickel-based composite compound battery materials have the advantages of high energy density, high working voltage platform, and high rate performance. The disadvantages of compound batteries are also very obvious. Due to the poor cycle stability at high temperature, the electrolyte is easy to decompose and produce gas on the surface of the active material during the battery cycle, resulting in poor cycle performance, and if the gas production is too large, it is easy to cause the battery to bulge. , affecting the safety performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Heat the assembled battery to 50 degrees Celsius, inject electrolyte A, the electrolyte A accounts for 65% by volume of the total electrolyte content, and the additive in the electrolyte A is 7.5% by volume 1,3-propylene sulfonate Lactone;

[0034] 2) Keep at this temperature, charge at 0.1C constant current to the charging cut-off voltage of 4.25V;

[0035] 3) Charge at a constant voltage at the cut-off voltage until the charge current is lower than the cut-off current by 0.01C;

[0036] 4) Vacuum exhaust;

[0037] 5) Small current pulse charging to the first predetermined voltage of 4.28V, the pulse charging current is 0.02C, the pulse time is 30s, and the interval is 2s;

[0038] 6) Constant-voltage charging with the first predetermined voltage until the charging current is lower than the cut-off current by 0.01C;

[0039] 7) Vacuum exhaust;

[0040] 8) 0.1C constant current discharge to discharge cut-off voltage 2.80V;

[0041] 9) Leave the battery to cool n...

Embodiment 2

[0048] 1) Heat the assembled battery to 60 degrees Celsius, inject electrolyte A, the electrolyte A accounts for 65% by volume of the total electrolyte content, and the additive in the electrolyte A is 7.5% by volume 1,3-propylene sulfonate Lactone;

[0049] 2) Keep at this temperature, charge at 0.1C constant current to the charging cut-off voltage of 4.25V;

[0050] 3) Charge at a constant voltage at the cut-off voltage until the charge current is lower than the cut-off current by 0.01C;

[0051] 4) Vacuum exhaust;

[0052] 5) Small current pulse charging to the first predetermined voltage of 4.28V, the pulse charging current is 0.05C, the pulse time is 60s, and the interval is 5s;

[0053] 6) Constant-voltage charging with the first predetermined voltage until the charging current is lower than the cut-off current by 0.01C;

[0054] 7) Vacuum exhaust;

[0055] 8) 0.1C constant current discharge to discharge cut-off voltage 2.80V;

[0056] 9) Leave the battery to cool n...

Embodiment 3

[0063] 1) Heating the assembled battery to 55 degrees Celsius, injecting electrolyte A, which accounts for 65% by volume of the total electrolyte content, and the additive in electrolyte A is 7.5% by volume 1,3-propenesulfonate Lactone;

[0064] 2) Keep at this temperature, charge at 0.1C constant current to the charging cut-off voltage of 4.25V;

[0065] 3) Charge at a constant voltage at the cut-off voltage until the charge current is lower than the cut-off current by 0.01C;

[0066] 4) Vacuum exhaust;

[0067] 5) Small current pulse charging to the first predetermined voltage of 4.28V, the pulse charging current is 0.03C, the pulse time is 40s, and the interval is 3s;

[0068] 6) Constant-voltage charging with the first predetermined voltage until the charging current is lower than the cut-off current by 0.01C;

[0069] 7) Vacuum exhaust;

[0070] 8) 0.1C constant current discharge to discharge cut-off voltage 2.80V;

[0071] 9) Leave the battery to cool naturally to r...

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Abstract

The invention provides a method for forming a lithium-nickel-based composite compound battery. The molecular formula of the lithium-nickel-based composite compound is LiNi 1‑x al x o 2 , x=0.02-0.03, the formation method is open formation, which includes heating the assembled battery to 50-60 degrees Celsius, injecting electrolyte A, keeping it at this temperature, and then charging at a constant voltage at the charge cut-off voltage, Until the charging current is lower than the cut-off current; vacuum exhaust; constant current discharge to the discharge cut-off voltage, let the battery stand to cool to room temperature naturally, constant current charging to the second predetermined voltage, and constant voltage charging at the second predetermined voltage until charging The current is lower than the cut-off current; the electrolyte C is injected, and the small current constant current is cycled several times under the second predetermined voltage and the charge cut-off voltage; the battery temperature is adjusted to room temperature, and the discharge cut-off voltage and the charge cut-off voltage are cycled several times to obtain the obtained The lithium-nickel-based composite compound battery described above. The lithium-nickel-based composite compound battery obtained by the chemical synthesis method has good high-temperature cycle performance.

Description

technical field [0001] The invention relates to a method for forming a lithium-nickel-based composite compound battery. Background technique [0002] Lithium-nickel-based composite compound battery materials have the advantages of high energy density, high working voltage platform, and high rate performance. The disadvantages of compound batteries are also very obvious. Due to the poor cycle stability at high temperature, the electrolyte is easy to decompose and produce gas on the surface of the active material during the battery cycle, resulting in poor cycle performance, and if the gas production is too large, it is easy to cause the battery to bulge. , affecting safety performance. Contents of the invention [0003] The invention provides a method for forming a lithium-nickel-based composite compound battery. The molecular formula of the lithium-nickel-based composite compound is LiNi 1-x Al x o 2 , x=0.02-0.03, the formation method is open formation, which includes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0567H01M10/42H01M10/44
CPCH01M10/0567H01M10/058H01M10/4235H01M10/446H01M10/448Y02E60/10Y02P70/50
Inventor 徐桂生李壮
Owner 江苏中奕和创智能科技有限公司
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