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Method for enhancing safety of lithium-ion battery

A lithium-ion battery, safety technology, applied in the direction of secondary battery, battery pack parts, secondary battery repair/maintenance, etc., can solve the problems of flame retardant loss, reduce the use effect of flame retardant, microcapsule rupture, etc. , to achieve the effect of increased usage, rapid protective response and remarkable effect

Inactive Publication Date: 2016-07-06
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the positive electrode sheet needs to be rolled under high pressure during the production process, it may cause the rupture of the microcapsules and cause the loss of the flame retardant during the processing, thereby reducing the actual use effect of the flame retardant

Method used

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  • Method for enhancing safety of lithium-ion battery
  • Method for enhancing safety of lithium-ion battery
  • Method for enhancing safety of lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The first step is the preparation of microcapsules. The microcapsules include a core part and a shell part, and the flame retardant trifluoroethyl carbonate is wrapped as the core part inside the shell part made of polytetrafluoroethylene. Microcapsules, the structure of the microcapsules is a mononuclear spherical type (such as figure 1 shown);

[0051] In the second step, the microcapsules in the first step are mixed into the solution containing the isolation membrane protective agent aluminum oxide;

[0052] In the third step, the solution mixed with microcapsules in the second step is evenly coated on the surface of the separator, and used as a lithium-ion battery separator after drying;

[0053] In the fourth step, the separator in the third step is assembled and applied to the lithium-ion battery by winding or stacking.

Embodiment 2

[0055] Different from Example 1: the capsule core part is flame retardant trimethylphenyl phosphate, and the capsule shell part is made of polyvinylidene chloride, and the structure of the microcapsules is a dual-core spherical type (such as figure 2 shown).

[0056] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0058] The difference from Example 1 is: the capsule core part is flame retardant trifluoroethyl carbonate and trimethylphenyl phosphate, the capsule shell part is made of polytetrafluoroethylene, and the structure of the microcapsule is a composite spherical type such as image 3 .

[0059] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and particularly relates to a method for enhancing the safety of a lithium-ion battery. The method comprises the steps as follows: a microcapsule is prepared; the microcapsule comprises a capsule core part and a capsule shell part; the capsule core part is coated with the capsule shell part; the capsule core part is a fire retardant for lithium ions; the fire retardant is coated with the capsule shell part to form the microcapsule; the microcapsule is mixed into a solution containing an isolating membrane protecting agent; the surface of an isolating membrane is evenly coated with the solution mixed with the microcapsule; the isolating membrane is used as the isolating membrane for the lithium-ion battery after being dried; and the treated isolating membrane is assembled and applied to the lithium-ion battery in a winding or laminating manner. The method has the beneficial effects that the fire retardant is coated with the microcapsule and is fixed on the surface of the isolating membrane, so that the viscosity of an electrolyte is not affected; the rate and the low-temperature performance of the battery are ensured; protective reaction can be relatively quickly made for the battery when thermal runaway is generated; and the safety improvement effect on the battery is relatively significant.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for enhancing the safety of lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used as a reliable energy source for portable electronic products such as mobile phones, notebook computers and small power-driven devices due to their advantages of high specific energy, high voltage, no memory effect, environmental protection and long life. However, in recent years, many battery safety accidents have occurred in various countries, mainly due to safety problems caused by thermal runaway caused by batteries under abuse (thermal shock, overcharge, short circuit, etc.), especially in electric vehicles, etc. Safety issues are especially important in bulk power supply applications. [0003] In order to improve the safety of lithium-ion batteries, the method adopted in the prior art is to add flame retardant additives to the e...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M2/16H01M50/409
CPCH01M10/4235H01M50/409Y02E60/10
Inventor 涂健刘凯
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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