A kind of lithium-ion battery water-based primer coating current collector and its preparation method and application

A lithium-ion battery and current collector technology, which is applied in the field of lithium-ion battery water-based primer coating current collector and its preparation, to achieve the effects of increased energy density, short preparation time, and increased load level

A lithium-ion battery and current collector technology, which is applied in the field of lithium-ion battery water-based primer coating current collector and its preparation, to achieve the effects of increased energy density, short preparation time, and increased load level

CN106784857BActive Publication Date: 2020-04-07SHENZHEN DYNANONIC
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  • A kind of lithium-ion battery water-based primer coating current collector and its preparation method and application
  • A kind of lithium-ion battery water-based primer coating current collector and its preparation method and application
  • A kind of lithium-ion battery water-based primer coating current collector and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0058] A method for preparing a water-based primer coating current collector, comprising the following steps:

[0059] 1. Add 60g of PEG into 1400g of deionized water and stir in the dispersion tank for 30min to completely dissolve it;

[0060] 2. Add 180g of graphene (flaky) and 435g of 350G (spherical) to the dispersion tank and stir for 30min. After the dispersion is uniform, use a sand mill to grind 4-5 times until the particle size D50 of the mixture is 20 μm. Yes, stop sanding;

[0061] 3. Add 80g of CMC to the dispersion tank in step 2, and stir to obtain a water-based primer slurry with a viscosity of about 4mPa·s;

[0062] 4. The obtained water-based primer slurry is coated on the surface of the aluminum foil current collector base material by doctor blade technology, and after drying, a primer layer with a thickness of 1 micron is formed to obtain a water-based primer collector.

[0063] figure 1 It is a schematic diagram of the structure of the water-based primer...

Embodiment 2

[0093] A method for preparing a water-based primer coating current collector, comprising the following steps:

[0094] 1. Add 72g of Triton X-100 into 1485g of deionized water, and stir in the dispersion tank for 60min to dissolve completely;

[0095]2. Add 115g of KS-6 (flaky) and 500g of Ketjen Black (spherical) to the above dispersion tank and stir for 2 hours. After the dispersion is uniform, use a sand mill to perform sand grinding for 4-5 times until the particle size of the mixture is D50 is 20-90μm, stop sanding;

[0096] 3. Add 90g of LA132 to the dispersion tank in step 2, and stir to obtain a water-based primer slurry with a viscosity of about 3mPa·s;

[0097] 4. The obtained water-based primer slurry is coated on the surface of the copper foil current collector base material by doctor blade technology, and after drying, a primer layer is formed to obtain a water-based primer collector.

[0098] The bottom layer of the water-based bottom-coated current collector o...

Embodiment 3

[0100] A method for preparing a water-based primer coating current collector, comprising the following steps:

[0101] 1. Add 65g of polyvinylpyrrolidone PVP into 1480g of deionized water, and stir in the dispersion tank for 45min to completely dissolve it;

[0102] 2. Add 250g of flake graphite (flaky) and 350g of acetylene black (spherical) to the above dispersion tank and stir for 2 hours. After the dispersion is uniform, use a sand mill to sand mill 4-5 times until the particle size D50 of the mixture is 20-90μm is enough, stop sanding;

[0103] 3. Add 70g of water-based binder LA133 to the dispersion tank in step 2, and stir to obtain a water-based primer slurry with a viscosity of about 8Pa·s;

[0104] 4. The obtained water-based primer slurry is coated on the surface of the copper foil current collector base material by doctor blade technology, and after drying, a primer layer is formed to obtain a water-based primer collector.

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Abstract

The invention provides a preparation method of a water system primary coating current collector for a lithium ion battery. The preparation method comprises the following steps of preparing water system primary coating slurry: mixing a water system dispersing agent and water, then adding sheeted conductive carbon and spherical conductive carbon for stirring and adding a water system adhesive agent to form the water system primary coating slurry, applying the water system primary coating slurry on the surface of a current collector substrate to form a primary coating after drying, and obtaining the water system primary coating current collector. The surface roughness of the water system primary coating current collector is higher; the stripping strength between the water system primary coating current collector and an active matter can be improved; contact resistance between the water system primary coating current collector and the active matter is improved; internal resistance of the battery is further reduced; the compacted density and energy density of the battery are improved; and the possibility is provided for power endurance of the battery.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery functional conductive current collector, in particular to a lithium-ion battery water-based bottom-coated current collector and its preparation method and application. Background technique [0002] A typical electrochemical cell has a cathode and an anode that participate in electrochemical reactions. To make electrodes, an electroactive material can be coated onto a current collector, which can serve as the positive and negative materials of the battery. Maintaining electrical contact between electrode active materials and conductive current collectors is critical for the efficient operation of electrochemical cells. [0003] Known, the transition layer coated between the electrode active material and the current collector, known as "primer" or "undercoat", can be bonded between the electrode active material and the current collector, and provide the electrode active material The...

Claims

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Application Information

Patent Timeline
07 Apr 2020
Publication
CN106784857B
IPC
H01M4/66; H01M4/136; H01M10/0525
CPC
H01M4/136; H01M4/662; H01M4/663; H01M4/667; H01M10/0525; Y02E60/10
Inventors
孔令涌; 尚伟丽