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A lithium ion battery negative electrode binder, negative electrode and battery

A lithium-ion battery and binder technology, applied in battery electrodes, adhesives, secondary batteries, etc., can solve problems such as poor cycle stability of lithium-ion batteries, weak bonding ability of styrene-butadiene rubber, and binder failure, etc., to achieve Good cycle stability, make up for weak bonding ability, and prevent falling off

Active Publication Date: 2017-12-12
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bonding ability of styrene-butadiene rubber is weak, and the carbon-carbon double bond will be degraded during the charging and discharging process of the battery, causing the binder to fail.
[0004] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art: the existing lithium-ion battery negative electrode binder cannot well suppress the volume expansion of the silicon-based negative electrode material during charge and discharge, resulting in The cycle stability of lithium-ion batteries is poor

Method used

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  • A lithium ion battery negative electrode binder, negative electrode and battery

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Effect test

Embodiment 1

[0056] In the present embodiment, the percentage by weight of each component of the negative electrode material is (in terms of dry material weight):

[0057] Sodium alginate, 4.5%; styrene-butadiene rubber, 0.9%; conductive carbon black, 5%; silicon carbon negative electrode active material, 89.6%. Among them, the number average molecular weight of sodium alginate is about 500,000, and the weight ratio of sodium alginate to styrene-butadiene rubber is 5:1.

[0058] The lithium-ion battery prepared by using the above-mentioned negative electrode material was charged and discharged at a rate of 0.5C at 25°C, and the capacity retention rate was 91% after 200 cycles.

Embodiment 2

[0060] In the present embodiment, the percentage by weight of each component of the negative electrode material is (in terms of dry material weight):

[0061] Sodium alginate, 2%; potassium alginate, 2%; styrene-butadiene rubber, 2%; conductive carbon black, 9%; silicon carbon negative electrode active material, 85%. Among them, the number average molecular weight of sodium alginate and potassium alginate is about 1 million, and the weight ratio of sodium alginate to styrene-butadiene rubber is 2:1.

[0062] The lithium-ion battery prepared by using the above-mentioned negative electrode material was charged and discharged at a rate of 0.5C at 25°C, and the capacity retention rate was 90.6% after 200 cycles.

Embodiment 3

[0064] In the present embodiment, the percentage by weight of each component of the negative electrode material is (in terms of dry material weight):

[0065] Sodium alginate, 1.5%; styrene-butadiene rubber, 1.5%; conductive carbon black, 2%; silicon carbon negative electrode active material, 95%. Among them, the number average molecular weight of sodium alginate is about 50,000, and the weight ratio of sodium alginate to styrene-butadiene rubber is 1:1.

[0066] The lithium-ion battery prepared by using the above-mentioned negative electrode material was charged and discharged at a rate of 0.5C at 25°C, and the capacity retention rate was 91.3% after 200 cycles.

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Abstract

The invention discloses a lithium ion battery negative electrode binder, a negative electrode and a battery, belonging to the technical field of lithium ion batteries. The negative electrode binder of the present invention includes alginate and styrene-butadiene rubber, and the weight ratio of the alginate and styrene-butadiene rubber is 1:1 to 5:1. In the invention, by adding alginate to the styrene-butadiene rubber, the binding performance of the obtained negative electrode binder is effectively improved, the structure damage of the lithium ion battery caused by the volume expansion of silicon during the charging and discharging cycle is prevented, and the cycle of the lithium ion battery is improved. Stable performance, the capacity retention rate of the lithium-ion battery can still be maintained above 90% after 200 charge-discharge cycles at a rate of 0.5C.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode binder, negative electrode and battery. Background technique [0002] Lithium-ion batteries have attracted people's attention due to their high energy density and good cycle performance, and have been developed rapidly in the past 20 years. At present, silicon-based anode materials have become the main anode materials for lithium-ion batteries due to their high theoretical specific capacity (4200mAh / g) and abundant sources. However, silicon-based negative electrode materials will undergo huge volume changes during charge and discharge, resulting in rapid capacity fading caused by material structure collapse, which limits the application of silicon-based negative electrode materials. Therefore, it is necessary to use a binder to adhere the silicon-based negative electrode material to the current collector (such as copper foil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J105/04C09J109/06H01M4/62H01M10/0525
CPCY02E60/10
Inventor 朱广燕
Owner CHERY AUTOMOBILE CO LTD
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