A high solid content semi-solid electrode, its preparation method and a lithium slurry flow battery comprising the electrode

A liquid flow battery, high solid content technology, applied in the direction of lithium battery, electrolyte battery manufacturing, non-aqueous electrolyte battery, etc., can solve the problems of high battery consistency requirements, complex battery management system, strong V ion toxicity, etc., to reduce Effects of battery side reactions, improving Coulombic efficiency, and stabilizing battery cycle

Active Publication Date: 2021-05-04
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

Among them, LIBs have the characteristics of high energy density, low cost, safety and environmental protection, etc. However, their large-scale application requires high battery consistency, complex battery management system and poor safety, and is not suitable for large-scale power plants above 100 MW
All-vanadium redox flow battery (VRB) is a representative of FBs. It has the advantages of easy scale-up, independent controllability of energy and power, etc. It has been applied at home and abroad in recent years, but it also has very prominent problems: due to the use of active materials The aqueous solution is used as the electrolyte, which is limited by the solubility and the solidification of water. Its energy density is only 1 / 5 of that of LIBs, and the high-valent V ions are highly toxic.

Method used

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  • A high solid content semi-solid electrode, its preparation method and a lithium slurry flow battery comprising the electrode
  • A high solid content semi-solid electrode, its preparation method and a lithium slurry flow battery comprising the electrode
  • A high solid content semi-solid electrode, its preparation method and a lithium slurry flow battery comprising the electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In an environment with a dew point of -52°C, lithium cobaltate with a D50 of 8 μm is used as the active material, Ketjen black (KB) and carbon nanotubes (CNT) are added as conductive agents, and the dispersant is grafted with butylsilane. SiO with a diameter of 10-15nm 2 Nanoparticles, weigh 60 parts of lithium cobaltate, 3 parts of KB, 5 parts of CNT and 5 parts of dispersant, add to DMC with 15 parts of active material mass, and mechanically stir for 30 minutes to obtain premix 1, the system temperature is the highest during the mixing process At about 63°C, a small amount of DMC in the premix volatilizes.

[0034] The premix was added to a total of 12.37 parts of a mixture of EC:VC:LiDFOB=15.6:1:1, and the mixture was further stirred for 20 minutes to obtain premix 2.

[0035] Freeze the premix to 5°C, add 3.5 parts of LiPF 6 , mixed evenly to obtain a slurry.

[0036] The slurry is coated on the nickel foam to obtain a semi-solid electrode.

[0037]Freeze the el...

Embodiment 2

[0039] The active material uses 70 parts (mass ratio, the same below) of lithium iron phosphate with a D50 of 150nm. In an environment with a dew point of -50°C, 2 parts of conductive carbon black Super P and 3 parts of carbon nanotubes are added as conductive agents and dispersants. 5 parts of TiO with a diameter of 5-15 nm grafted with fluoro-n-butylsilane 2 For nanoparticles, the four components were mixed in proportion and then mechanically mixed in a dry mixer for 60 minutes to obtain premix 1. During the mixing process, the system temperature was at a maximum of about 78°C.

[0040] Add 5.8 parts of EC, 10.8 parts of DMC, 0.37 parts of VC and 0.37 parts of LiFSI to premix 1, and mechanically stir in a mixing tank with a cooling device for 100 minutes to obtain premix 2. The maximum temperature during the mixing process is about 53°C.

[0041] Freeze the premix to 5°C, add 2.6 parts of LiPF 6 , mixed evenly to obtain a slurry.

[0042] The slurry is coated on the surfa...

Embodiment 3

[0045] The implementation process is the same as in Example 2, but the active material is NCM622 large single crystal with a D50 of 3 μm, and the ambient humidity is controlled at a dew point of -55°C. The mass of active material in a single sheet is about 85 mg, and the N / P ratio of the battery is about 1.57. The battery test voltage range is 2.8 ~ 4.4V.

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Abstract

The invention relates to the composition and preparation method of a semi-solid electrode with high solid content and a lithium slurry flow battery thereof. The electrode is composed of an active material, a conductive agent, a nanostructured dispersant grafted with a polar alkyl chain on the surface, an electrolyte composition, and a current collector. It is characterized in that the mass ratio of the active material particles in the semi-solid electrode can be up to 90% of the slurry system, and the dispersant and conductive agent are jointly adsorbed on the surface of the active material particles, on the one hand, it reduces the direct contact between the active material and the electrolyte, reduces the possibility of side reactions, and improves the coulombic efficiency of the battery; On the other hand, the nanostructured dispersant effectively reduces the viscosity and shear strength of the semi-solid electrode, so the electrode has better fluidity under the same solid content, which is beneficial to reduce the power consumption during the flow process of the slurry flow battery electrode . The electrode is used in a lithium slurry flow battery, which can improve the first Coulombic efficiency and energy density of the battery, and is conducive to the long-term and stable cycle of the battery.

Description

technical field [0001] The invention relates to the technical field of manufacturing semi-solid electrodes and lithium-ion energy storage batteries, in particular to the composition and preparation method of a semi-solid electrode with high solid content and a lithium slurry flow battery. Background technique [0002] With the rapid development of economy and society, non-renewable resources such as fossil energy are rapidly consumed, which also brings CO 2 A large number of emissions, environmental pollution and other issues, whether the new energy power represented by wind energy and solar energy can be effectively used has become an important issue related to the national economy and people's livelihood. Energy storage power station is the key to the application of new energy power. It can not only reduce the curtailment of wind and light, but also effectively improve the quality of power. It is crucial to the construction of a safe and smart grid. [0003] Lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/052H01M10/058B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/13H01M4/139H01M4/62H01M4/628H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 张兰巫湘坤钱伟伟彭琳珊张海涛张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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