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Battery thick pole plate and water-based composite binding agent

A binder and pole piece technology, applied in battery electrodes, active material electrodes, circuits, etc., can solve the problems of increasing the mechanical stability of the pole piece, dissolution, and reducing the polarization of the pole piece, so as to avoid the dissolution of the binder, Increases the effect of intertwining and maintaining mechanical stability

Active Publication Date: 2018-11-23
赵明星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the objectives of the present invention is to provide a water-based composite binder for battery thick pole pieces, which has the advantages of low cost, environmental protection, and simple preparation method. The thick pole piece of the water-based battery can reduce the polarization of the pole piece, increase the mechanical stability of the pole piece, and solve the problem of binder dissolution, thereby improving the cycle stability of the battery using the thick pole piece

Method used

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  • Battery thick pole plate and water-based composite binding agent

Examples

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Embodiment 1

[0033] This embodiment provides a water-based composite binder for battery thick pole pieces, which at least includes the following components in parts by weight:

[0034] 6 parts by weight of vinyl fluoride polymer;

[0035] 0.6 parts by weight of cross-linked water-absorbing polymer;

[0036] 30 parts by weight of water;

[0037] Vinyl fluoride polymers and cross-linked water-absorbing polymers form an intertwined polymer network.

[0038]The vinyl fluoride polymer is PTFE, and the cross-linked water-absorbing polymer is cross-linked sodium carboxymethyl cellulose. The degree of cross-linking of sodium cellulose is 75%.

Embodiment 2

[0040] This embodiment provides a water-based composite binder for battery thick pole pieces, which at least includes the following components in parts by weight:

[0041] 7 parts by weight of vinyl fluoride polymer;

[0042] 0.9 parts by weight of cross-linked water-absorbing polymer;

[0043] 35 parts by weight of water;

[0044] The vinyl fluoride polymer and the cross-linked water-absorbing polymer form an intertwined polymer network.

[0045] The vinyl fluoride polymer is PVDF. The cross-linked water-absorbing polymer is cross-linked sodium polyacrylate.

[0046] The average molecular weight of the PVDF is 650,000. The molecular weight of the cross-linked sodium polyacrylate is 4 million, and the cross-linking degree of the cross-linked sodium polyacrylate is 80%.

Embodiment 3

[0048] This embodiment provides a water-based composite binder for battery thick pole pieces, which at least includes the following components in parts by weight:

[0049] 6.5 parts by weight of vinyl fluoride polymer;

[0050] 0.75 parts by weight of cross-linked water-absorbing polymer;

[0051] 28 parts by weight of water;

[0052] The vinyl fluoride polymer and the cross-linked water-absorbing polymer form an intertwined polymer network.

[0053] The vinyl fluoride polymer is PVDF. The cross-linked water-absorbing polymer is cross-linked polyvinylpyrrolidone. The average molecular weight of vinyl fluoride polymer PVDF is 680,000. The average molecular weight of cross-linked polyvinylpyrrolidone is 70,000. The degree of crosslinking of the crosslinked polyvinylpyrrolidone was 65%.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a water-based composite binding agent for a battery thick pole plate. The water-based composite binding agent atleast comprises the following constituents based on parts by weight: 5-8 parts of vinyl fluoride polymer, 0.5-1 part of crosslinking water absorption polymer and 20-40 parts of water, wherein the vinyl fluoride polymer and the crosslinking water absorption polymer form a polymer network twisted in a staggered way. Compared with the prior art, the water-based composite binding agent has the advantages that the molecule chain of the crosslinking water absorption polymer is of a net-shaped structure, the macromolecular chain and the macromolecular net-shaped structure act with each other by a mutual effect of the vinyl fluoride polymer and the crosslinking water absorption polymer, the polymer network which is twisted in the staggered way is formed, and the phenomenon that the binding agent is dissolved out even if the binding agent is placed in an electrolyte for a long time is prevented.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery thick pole piece and a water-based composite binder thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high working voltage, and small self-discharge. However, due to the use of organic electrolytes, organic solvents (generally N-methylpyrrolidone (NMP)) are used as solvents for the electrolytes, which are volatile and easily It is flammable and explosive, which has serious harm and pollution to human body and environment, and has potential safety hazards. Compared with organic batteries, water-based batteries have the advantages of low cost and high safety. This is because water-based batteries use common, environmentally friendly and inexpensive water as a solvent. [0003] SBR or PTFE is often used as the binder in water-based batteries. However, the weak bonding force of SBR leads to weak bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/02
CPCH01M4/02H01M4/623Y02E60/10
Inventor 王莹莹陈京才张新河汤春微黄云辉张涛任朴
Owner 赵明星
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