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Aqueous lithium-ion battery composite electrode and preparation method thereof, and aqueous lithium-ion battery

A lithium-ion battery and composite electrode technology, applied in electrode manufacturing, secondary batteries, active material electrodes, etc., can solve the problems of poor cycle performance, low battery energy density, and poor cycle performance of negative electrode materials.

Active Publication Date: 2016-11-23
WM SMART MOBILITY (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, this aqueous lithium-ion battery has the following defects: in aqueous solution, when the lithium ion intercalation and deintercalation process reaches a certain potential, hydrogen evolution and oxygen evolution reactions will occur, and it is difficult to find lithium ion intercalation and deintercalation without hydrogen evolution. , oxygen-evolving electrode materials, and the negative electrode materials used have poor cycle performance
[0009] However, this water-based lithium-ion battery also has the following defects: the use of LiTi 2 (PO4) 3 As a negative electrode, the gram capacity is low (about 100mAh / g), and the potential for lithium is high (about 2.5V), resulting in a low battery operating voltage, less than 2.0V. The energy density of such an aqueous lithium-ion battery is only about 40Wh / Kg. Therefore, Limits the application, such as not being able to be applied to electric vehicles, and the positive active material is in contact with water, resulting in poor cycle performance
[0010] From the above, the electrolyte solvent water in the current water-based lithium-ion battery is due to its decomposition potential, especially the reduction potential of hydrogen is high relative to the lithium potential. In order to ensure that hydrogen is not precipitated during charge and discharge, the charge and discharge voltage Low, generally the voltage range is only between 0.8 ~ 1.5V, the low voltage makes the energy density of the battery low, it is difficult to be applied

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  • Aqueous lithium-ion battery composite electrode and preparation method thereof, and aqueous lithium-ion battery
  • Aqueous lithium-ion battery composite electrode and preparation method thereof, and aqueous lithium-ion battery
  • Aqueous lithium-ion battery composite electrode and preparation method thereof, and aqueous lithium-ion battery

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preparation example Construction

[0050] Correspondingly, the example of the present invention also provides a method for preparing the composite electrode of the above-mentioned aqueous lithium-ion battery with a simple process. For the process flow of the preparation method of the aqueous lithium ion battery composite electrode, please refer to Figure 4 , see also Figures 1 to 3 , the preparation method of the aqueous lithium-ion battery composite electrode comprises the following steps:

[0051] S01. Obtain the positive pole piece 11 or the negative pole piece 12 with the active material layer bonded on the surface;

[0052] S02. Vacuum encapsulation of the solid electrolyte membrane: vacuum-encapsulate the active material layer of the positive pole piece 11 or the negative pole piece 12 obtained in step S01 with a solid electrolyte membrane coated with a binder to obtain the positive or negative water system Composite electrodes for lithium-ion batteries.

[0053] Specifically, obtaining the positive ...

Embodiment 1

[0073] A method for preparing a positive electrode aqueous lithium-ion battery composite electrode, comprising the steps of:

[0074] (1) by LiCoO 2 : carbon black: binder = 90:5:5 mass ratio LiCoO 2 , carbon black, and binder are added into N-methyl-2-pyrrolidone (NMP) and uniformly mixed to make positive electrode slurry, and the slurry is evenly coated on a 16-micron aluminum foil, and the surface density of the coating is controlled to be 34 mg / cm2, then dried at 120°C, rolled, and cut into 392 mm x 78 mm positive electrode sheets containing 9.5 g of the active ingredient LiCoO 2 ;

[0075] (2) Obtain a solid electrolyte membrane Li with a thickness of 50um 10 GeP 2 S 12 , cut to 394 mm × 80 mm, with two pieces of solid electrolyte film in the middle of a positive electrode sheet prepared in step (1), through hot-pressed vacuum packaging together to obtain a positive electrode aqueous lithium-ion battery composite electrode, the positive electrode active material is c...

Embodiment 2

[0082] A method for preparing a positive electrode aqueous lithium-ion battery composite electrode, comprising the steps of:

[0083] (1) Press LiNi 0.5 mn 1.5 o 4 : carbon fiber: binder = 90:5:5 mass ratio LiNi 0.5 mn 1.5 o 4 , carbon fiber, and binder are added to N-methyl-2-pyrrolidone (NMP) and mixed evenly to make a positive electrode slurry, and the slurry is evenly coated on a 16-micron aluminum foil, and the surface density of the coating is controlled to be 34 mg / cm2, then dried at 120°C, rolled, and cut into 392 mm x 78 mm positive electrode sheets containing 9.5 g of active ingredient LiNi 0.5 mn 1.5 o 4 ;

[0084] (2) Obtain a garnet-type solid electrolyte membrane Li with a thickness of 50um 5 La 3 Ta 2 o 12 , cut to 396 mm × 82 mm, sandwiched a piece of positive electrode sheet prepared in step (1) between two solid electrolyte films, and packaged together by hot pressing and vacuum to obtain a positive electrode aqueous lithium-ion battery composite ...

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Abstract

The invention discloses an aqueous lithium ion battery composite electrode, a preparation method of the composite electrode and an aqueous lithium ion battery. The aqueous lithium ion battery composite electrode comprises a positive electrode piece or a negative electrode piece and a solid electrolyte membrane coating layer, wherein an active material layer is combined with the surface of the positive electrode piece or the surface of the negative electrode piece; the solid electrolyte membrane coating layer is used for packaging the active material layer of the positive electrode piece or the negative electrode piece in a vacuum mode. Through the aqueous lithium ion battery composite electrode, the direct contact between the positive electrode active material layer or the negative electrode active material layer and water of an aqueous electrolyte can be prevented, so that hydrogen evolution reaction and oxygen evolution reaction of the aqueous electrolyte can be prevented, and thus side reaction between active substances and the water can be prevented. The aqueous lithium ion battery comprises a positive aqueous lithium ion battery composite electrode and a negative aqueous lithium ion battery composite electrode, so that high voltage and energy density are provided for the aqueous lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a composite electrode of an aqueous lithium ion battery, a preparation method thereof, and an aqueous lithium ion battery. Background technique [0002] With the low-carbon economy in the ascendant, lithium-ion batteries are actively developing in the direction of power vehicles and grid energy storage. The development of lithium-ion batteries with high energy density, long cycle life, high safety and low cost has become the focus of industry research. [0003] The current organic solvent system lithium-ion battery has the characteristics of high voltage, high energy density, and good cycle performance. It is widely used in portable digital products, such as mobile phones, cameras, and notebook computers. At the same time, it has gradually begun to be used in the field of electric bicycles. However, because the battery uses organic solvents, the safety of the batter...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M10/36
CPCH01M4/02H01M4/04H01M10/36Y02E60/10
Inventor 叶海林张光辉
Owner WM SMART MOBILITY (SHANGHAI) CO LTD
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