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Binder for rechargeable lithium ion battery, separator for rechargeable lithium ion battery, and rechargeable lithium ion battery

A lithium-ion battery, recharging technology, applied in battery electrodes, secondary batteries, battery pack components, etc., can solve problems such as non-adhesion and deterioration of battery capacity

Active Publication Date: 2020-08-18
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the binder satisfies the adhesion requirements to porous polyethylene or inorganic particles, but does not have sufficient adhesion to both
[0014] Therefore, when a rechargeable lithium battery using a coated separator formed by using the aforementioned binder is repeatedly charged and discharged, the coating is structurally changed, and as a result, the battery capacity deteriorates

Method used

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  • Binder for rechargeable lithium ion battery, separator for rechargeable lithium ion battery, and rechargeable lithium ion battery
  • Binder for rechargeable lithium ion battery, separator for rechargeable lithium ion battery, and rechargeable lithium ion battery
  • Binder for rechargeable lithium ion battery, separator for rechargeable lithium ion battery, and rechargeable lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] Synthesis Example 1: Synthesis of polymethacrylonitrile (PMAN) particle solution (hard segment (Tg of homopolymer: 67°C))

[0150] 600 g of distilled water was placed in a 1000 ml four-necked flask equipped with a stirrer, a thermometer, and a cooling tube, and its internal pressure was reduced to 10 mmHg three times with a diaphragm pump, and then increased to normal pressure with nitrogen.

[0151] Subsequently, sodium lauryl sulfate (7.5 g, 0.026 mol) dissolved in 20 g of degassed distilled water was added thereto, and additionally, methacrylonitrile (150 g, 2.236 mol) and ammonium persulfate (2.55 g, 0.0112mol, 0.005eq), and the mixture was stirred at 600rpm.

[0152] The reaction solution was allowed to react for 6 hours while stably maintaining the temperature between 70°C and 80°C by controlling heat treatment.

[0153] The reaction product was cooled to room temperature and yielded a product with a non-volatile (NV) content of 20.0% (21% of theory) when measu...

Embodiment 2

[0154] Synthesis Example 2: Poly N-(isobutoxymethyl)acrylamide (PIBMAAM) particle solution (Tg of hard segment (average Polymer: Synthesis of 135°C))

[0155] 600 g of distilled water was placed in a 1000 ml four-neck flask equipped with a stirrer, a thermometer, and a cooling tube, and its internal pressure was reduced to 10 mmHg three times with a diaphragm pump, and then increased to normal pressure with nitrogen.

[0156] Then, sodium lauryl sulfate (7.5 g, 0.026 mol) dissolved in 20 g of degassed distilled water was added thereto, and N-(isobutoxymethyl)acrylamide (150 g, 1.048 mol) was added thereto and ammonium persulfate (1.19 g, 0.00524 mol, 0.005 equiv), and the mixture was stirred at 600 rpm.

[0157] The reaction solution was allowed to react for 6 hours while stably maintaining the temperature between 70°C and 80°C by controlling heat treatment.

[0158] The reaction product was cooled to room temperature, 150 g of water was removed using a rotary evaporator,...

Embodiment 3

[0159] Synthesis Example 3: poly N-phenylmethacrylamide (PPMAAM) particle solution (hard segment (Tg of homopolymer: Synthesis of 165°C))

[0160] 600 g of distilled water was placed in a 1000 ml four-necked flask equipped with a stirrer, a thermometer, and a cooling tube, and its internal pressure was reduced to 10 mmHg three times with a diaphragm pump, and then returned to normal pressure with nitrogen.

[0161] Subsequently, sodium lauryl sulfate (7.5 g, 0.026 mol) dissolved in 20 g of degassed distilled water was added thereto, and additionally, phenylmethacrylonitrile (150 g, 0.931 mol) and ammonium persulfate ( 0.935 g, 0.00465 mol, 0.005 equiv), and the mixture was stirred at 600 rpm.

[0162] The reaction solution was allowed to react for 6 hours while stably maintaining the temperature between 70°C and 80°C by controlling heat treatment.

[0163] The reaction product was cooled to room temperature, 150 g of water was removed using a rotary evaporator, and then d...

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Abstract

The present invention relates to a binder for a rechargeable lithium ion battery, a separator for a rechargeable lithium ion battery, and a rechargeable lithium ion battery. Binders for rechargeable batteries include IPN-type acrylic-based resins that include hard segments having a glass transition temperature in the range of greater than or equal to about 50°C and less than or equal to about 200°C and having A soft segment with a glass transition temperature in the range of greater than or equal to about -100°C and less than or equal to about 30°C.

Description

technical field [0001] The present disclosure relates to an adhesive for a rechargeable battery, a separator for a rechargeable battery, and a rechargeable battery including the same. Background technique [0002] Recently, as the size and weight of various electronic devices decrease, there is a need for a rechargeable battery that has a high capacity and is small in size and weight as a power source for these electronic devices. [0003] In particular, research on developing rechargeable lithium-ion batteries has been high, and at the same time has been manufactured and marketed due to benefits such as high voltage, long cycle life, high energy density, and the like. [0004] These properties of the rechargeable lithium-ion battery can be largely influenced by properties of the electrodes, electrolyte solution, other battery materials, and the like. [0005] In particular, a separator for a rechargeable lithium ion battery affects the cycle characteristics of the recharge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M2/14H01M2/16H01M10/0525H01M50/414H01M50/434H01M50/443H01M50/451H01M50/457H01M50/489
CPCH01M4/622H01M10/0525H01M50/451H01M50/443H01M50/414H01M50/434H01M50/457H01M50/489H01M4/525H01M4/505Y02E60/10H01M50/446
Inventor 福地巌
Owner SAMSUNG SDI CO LTD