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Aqueous binder for lithium ion battery anode and preparation method thereof

A lithium-ion battery and binder technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problem that the binder cannot meet the requirements, and achieve wide application range, excellent performance, and stable cycle good sex effect

Active Publication Date: 2019-10-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, some high-melting electrode materials (such as silicon, etc.) will have significant volume changes during charge-discharge cycles, and these commonly used binders cannot meet the requirements, so it is necessary to develop binders with better performance to meet the requirements. need

Method used

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  • Aqueous binder for lithium ion battery anode and preparation method thereof
  • Aqueous binder for lithium ion battery anode and preparation method thereof
  • Aqueous binder for lithium ion battery anode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The synthesis of the aqueous binder of the present embodiment is as follows:

[0040] 1g of polyvinyl alcohol solid was dissolved in 25ml of water at 90 degrees Celsius to obtain a transparent polyvinyl alcohol solution; 0.375g of dopamine powder was dissolved in 5ml of tris-Hcl buffer solution with pH = 8.5, and autogenously occurred in a light-shielding and aerobic environment. Polymerization produces polydopamine solution. In the resulting polydopamine solution, the mass of polydopamine is equal to that of dopamine. Afterwards, 25 ml of polyvinyl alcohol solution, 5 ml of polydopamine solution and 5 ml of 1.4% PEDOT:PSS aqueous solution were uniformly mixed to obtain a binder.

[0041] Mix the binder, nano-silica powder, and conductive carbon black evenly according to the mass ratio of 2:6:1, coat it on the copper foil, dry it at 50 degrees Celsius for two hours, then cut it into the size of the pole piece, and then vacuum Dry at 110 degrees Celsius in the environm...

Embodiment 2

[0043] The preparation method and reaction conditions of polyvinyl alcohol solution and polydopamine solution described in this embodiment are the same as in Example 1, but the mass of dopamine powder is 0.25g. Then through the same process as in Example 1 to obtain the binder.

[0044]Mix the binder, nano-silica powder, and conductive carbon black evenly according to the mass ratio of 2:6:1, coat it on the copper foil, dry it at 50 degrees Celsius for two hours, then cut it into the size of the pole piece, and then vacuum Dry at 110 degrees Celsius in the environment to obtain the negative electrode sheet; finally, the obtained negative electrode sheet is assembled into a button battery with a separator, a lithium metal sheet, and an electrolyte. The electrolyte is a carbonate solution in which LiPF6 is dissolved, and 10 wt % fluoroethylene carbonate (FEC) is added as an additive. The test result of the battery is that the capacity of the battery is 1800mAh / g for the first t...

Embodiment 3

[0046] The preparation method, reaction conditions and input amount of the water-based binder in this embodiment are the same as those in Embodiment 1.

[0047] Mix the binder, nano-silica powder, and conductive carbon black evenly according to the mass ratio of 1:8:1, coat it on the copper foil, dry it at 50 degrees Celsius for two hours, then cut it into the size of the pole piece, and then vacuum Dry at 110 degrees Celsius in the environment to obtain the negative electrode sheet; finally, the obtained negative electrode sheet is assembled into a button battery with a separator, a lithium metal sheet, and an electrolyte. The electrolyte is a carbonate solution in which LiPF6 is dissolved, and 10 wt % fluoroethylene carbonate (FEC) is added as an additive. The test result of the battery is that the capacity of the battery is 2000mAh / g for the first time, and after 100 cycles, the capacity of the battery can maintain 78%.

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Abstract

The invention belongs to the field of lithium ion battery anode materials and discloses an aqueous binder for a lithium ion battery anode and a preparation method thereof. The main components of the binder comprise polyvinyl alcohol (PVA), polydopamine (PDA), and poly 3,4-ethylenedioxythiophene:polystyrene sulfonate aqueous solution (PEDOT:PSS). The present invention discloses a method of preparing the binder and a lithium ion battery prepared from such a binder. The binder has good adhesion, is excellent in performance when used in a lithium ion battery, is particularly suitable for a lithiumion battery using silicon as an anode, and can improve the cycle stability of a silicon-based lithium ion battery.

Description

technical field [0001] The invention belongs to the field of polymer binders used in electrochemical energy storage devices, and in particular relates to a water-based binder used for negative electrode materials of lithium-ion batteries and a preparation method thereof. Background technique [0002] Today's society requires efficient energy storage systems, and lithium-ion batteries are currently one of the most concerned energy storage devices, mainly used in electric vehicles, smartphones, and tablet computers. The performance of the electrode material is the key to determine the performance of the lithium-ion battery. Among them, the binder is used to bind the conductive agent particles and the active material, and bind them to the surface of the metal current collector. The performance of the binder is closely related to the cycle performance of the battery. relevant. If the performance of the binder is not good, it is easy to cause the electrode to pulverize during th...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M4/139C08G73/06H01M10/0525
CPCC08G73/0672H01M4/13H01M4/139H01M4/622H01M10/0525Y02E60/10
Inventor 魏良明唐瑞娴
Owner SHANGHAI JIAO TONG UNIV
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