A binder, negative electrode slurry using it, its preparation method and application

A negative electrode slurry and binder technology, applied in negative electrodes, structural parts, battery electrodes, etc., can solve the problems of coulombic efficiency and cycle life to be improved, lithium-ion battery capacity decay, and cycle life to be improved, etc. Industrial mass production application, increasing lithium ion conductivity, low price effect

Active Publication Date: 2021-03-23
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyvinylidene fluoride is a relatively mature binder in the industry, but its elasticity is poor, and it cannot effectively buffer the stress caused by the volume change of Si, resulting in a rapid decline in the capacity and stability of lithium-ion batteries; and it needs to be used during its use. Consume a large amount of organic solvent N-methylpyrrolidone, causing greater environmental pollution and higher cost
[0006] CN107170989A discloses a lithium-ion battery silicon-based negative electrode material binder, including the following components in mass fraction: sodium hyaluronate 50-100%, sodium alginate 0-50%, by sodium hyaluronate alone or with Mixed use of sodium alginate, because sodium hyaluronate can be dispersed in water to form a viscous liquid, its molecule contains more hydroxyl polar functional groups, which can form more hydrogen bonds with the silicon oxide layer on the silicon surface, further strengthening the bond between the binder and The bonding force between silicon materials; the silicon-based negative electrode material binder prepared by the invention has good bonding force, and can increase the electrochemical performance of silicon-based negative electrode materials, but its coulombic efficiency and cycle life still need to be improved
[0007] CN108172764A discloses a high specific capacity silicon-based negative electrode and its manufacturing method. The high specific capacity silicon-based negative electrode includes a current collector and a negative electrode film layer coated outside the current collector. The negative electrode film layer contains a silicon-based negative electrode active material, a composite adhesive A binder and a conductive agent, the composite binder includes a water-soluble component A and a water-soluble component B, the component A includes a lithium ion polymer, and the component B includes modified polyacrylic acid (PAA) and seaweed Sodium Acid (SA) at least one; the negative electrode film layer prepared by this method can effectively improve the material performance of the lithium battery silicon-based negative electrode, but its cycle life still needs to be improved

Method used

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  • A binder, negative electrode slurry using it, its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0046] This embodiment provides a kind of binding agent, and described binding agent comprises the sodium alginate that mass percent content is 40%, the cyclodextrin of 40% and the lithium salt of 20%, wherein cyclodextrin is α-ring The combination of dextrin and β-cyclodextrin, the mass ratio of α-cyclodextrin and β-cyclodextrin is 1:1, the lithium salt is the combination of lithium oxalate and lithium carbonate, the mass ratio of lithium oxalate and lithium carbonate is 1:1.

[0047] The preparation method of the binder comprises: dissolving 300g of sodium alginate, 300g of cyclodextrin and 150g of lithium salt in 3500g of deionized water and mixing to obtain the binder.

[0048] The negative electrode slurry includes 80% by mass of silicon-based material (SiC600), 5% of conductive additive (SP) and 15% of the binder prepared above.

[0049] The preparation method of the negative electrode slurry includes: dissolving 4000g of silicon-based materials, 250g of conductive addi...

Embodiment 2

[0060] This embodiment provides a kind of binding agent, and described binding agent comprises the sodium alginate that mass percentage content is 75%, the cyclodextrin of 20% and the lithium salt of 5%, wherein cyclodextrin is α-ring The combination of dextrin and β-cyclodextrin, the mass ratio of α-cyclodextrin and β-cyclodextrin is 3:1, the lithium salt is the combination of lithium oxalate and lithium carbonate, the mass ratio of lithium oxalate and lithium carbonate is 4:1.

[0061] The preparation method of the binder includes: dissolving 562.5g of sodium alginate, 30g of cyclodextrin and 7.5g of lithium salt in 700g of deionized water and mixing to obtain the binder.

[0062] The negative electrode slurry includes 96% by mass of silicon-based material (SiC600), 1% of conductive additive (SP) and 3% of the binder prepared above.

[0063] The preparation method of the negative electrode slurry includes: dissolving 4800g of silicon-based material, 50g of conductive additi...

Embodiment 3

[0071] This embodiment provides a kind of binding agent, and described binding agent comprises the sodium alginate that mass percentage content is 50%, the cyclodextrin of 35% and the lithium salt of 15%, wherein cyclodextrin is α-ring The combination of dextrin and β-cyclodextrin, the mass ratio of α-cyclodextrin and β-cyclodextrin is 2:1, the lithium salt is the combination of lithium oxalate and lithium carbonate, the mass ratio of lithium oxalate and lithium carbonate is 2:1.

[0072] The preparation method of the binder comprises: dissolving 375g of sodium alginate, 262.5g of cyclodextrin and 112.5g of lithium salt in 3500g of deionized water and mixing to obtain the binder.

[0073] The negative electrode slurry includes 90% by mass of silicon-based material (SiC600), 3% of conductive additive (SP) and 7% of the binder prepared above.

[0074] The preparation method of the negative electrode slurry includes: dissolving 4500g of silicon-based material, 150g of conductive...

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Abstract

The invention provides a binder, negative slurry using same, and a preparation method and an application thereof. The binder includes sodium alginate, cyclodextrin and lithium salt. The binder can buffer the stress caused by the volume effect of silicon particles in the process of lithiation and delithiation, so as to reduce the phenomena of powdering and shedding of materials, improve the coulombefficiency of batteries and prolong the cycle life of lithium ion barriers adopting a silicon-based negative pole. The preparation method of the binder is simple, and the raw materials are easy to obtain. The binder is low in price, is easy to prepare in batches, and is suitable for industrial production. The slurry prepared from the binder has better uniformity and cohesiveness, and can enhancethe transport capacity of lithium ions and improve the rate performance and cycle stability of batteries. The preparation method of the slurry is simple, the raw materials are easy to obtain, and theslurry is low in price and easy to realize. A lithium ion battery prepared by the negative slurry has good rate performance and cycle stability, and can be used as power batteries in electric vehicles.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a binder, a negative electrode slurry using the binder, a preparation method and application thereof. Background technique [0002] Lithium-ion power batteries are the most promising energy storage devices with a growing market and are widely used in portable electronic devices, electric vehicles, electric vehicles and energy storage systems. It has the advantages that other batteries cannot surpass: small size, light weight, high energy density, green environmental protection, high safety performance and excellent cycle performance. [0003] In order to increase the energy density of lithium-ion power batteries, increasing the specific capacity of positive and negative electrode materials is the main means. The theoretical specific capacity of the silicon negative electrode material is 4200mAh / g, which is more than ten times that of the graphite negative electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/386H01M4/622H01M10/0525H01M2004/027Y02E60/10
Inventor 张锁江李丽媛张兰詹秋设
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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