Preparation method of high-viscosity ultra-fine dispersion anode slurry of lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limited ultra-fine dispersion, poor suspension, large slurry particles, etc., and achieve excellent performance and consistency. Avoid the dead angle of the slurry and the effect of low viscosity of the slurry

Active Publication Date: 2014-01-29
江西格林德能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used planetary mixer can further micro-disperse the slurry to a certain extent while realizing macro-dispersion processing. However, since the planetary mixer is an open dispersion method, the ultra-fine dispersion effect is limited, and the dispersion process is not thorough enough. There is a dead angle of dispersion, large particles of the slurry after dispersion, and poor suspension, resulting in unsatisfactory consistency of the slurry on the microscopic level, and it is difficult to achieve microscopic dispersion at the molecular level
[0005] Therefore, the preparation technology and process of the existing lithium-ion battery positive electrode slurry still need to be further improved and developed.

Method used

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  • Preparation method of high-viscosity ultra-fine dispersion anode slurry of lithium ion battery
  • Preparation method of high-viscosity ultra-fine dispersion anode slurry of lithium ion battery
  • Preparation method of high-viscosity ultra-fine dispersion anode slurry of lithium ion battery

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Embodiment 1

[0025] The lithium ion battery positive electrode slurry of the present embodiment is made of N-methylpyrrolidone (NMP), binder polyvinylidene fluoride, nanometer composite conductive agent, LiFePO 4 The positive electrode material is mixed, polyvinylidene fluoride, nano-micro composite conductive agent, LiFePO 4 The weight ratio of the positive electrode material is polyvinylidene fluoride: nano-micron composite conductive agent: positive electrode material=4.5%: 3.5%: 92.0%, wherein 3.5% nano-micron composite conductive agent is composed of 1.0% nanoscale conductive agent Super-P, Composed of 2.0% micron-sized conductive graphite KS-6 and 0.5% carbon nanotubes. The preparation of the positive electrode slurry in this embodiment specifically includes the following steps:

[0026] 1. Add the binder polyvinylidene fluoride (PVDF) to the 15wt% solvent in a high-viscosity mixer, turn on the circulating water, raise the temperature and keep the temperature of the solvent at 60±5°...

Embodiment 2

[0033] The lithium ion battery positive electrode slurry of the present embodiment is made of N-methylpyrrolidone (NMP), binder polyvinylidene fluoride, nanometer composite conductive agent, LiFePO 4 The positive electrode material is mixed, polyvinylidene fluoride, nano-micro composite conductive agent, LiFePO 4 The weight ratio of the positive electrode material is polyvinylidene fluoride: nano-micron composite conductive agent: positive electrode material=5.0%: 3.5%: 91.5%, wherein 3.5% nano-micron composite conductive agent is composed of 1.0% nanoscale conductive agent Super-P, Composed of 1.5% micron-sized conductive graphite KS-6 and 1.0% carbon nanotubes. The preparation of the positive electrode slurry in this embodiment specifically includes the following steps:

[0034] 1. Add the binder polyvinylidene fluoride (PVDF) to the 30Wt% solvent in a high-viscosity mixer, turn on the circulating water, raise the temperature and keep the solvent temperature at 60±5°C, and ...

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Abstract

The invention discloses a preparation method of high-viscosity ultra-fine dispersion anode slurry of a lithium ion battery. The anode slurry of the lithium ion battery is formed by mixing solvents, polyvinylidene fluoride serving as a binder, a nanometer micrometer compound conductive agent and an anode material. The preparation method comprises the following steps of: performing high-speed shearing and ultra-fine dispersion on slurry containing the nanometer micrometer compound conductive agent by virtue of a high-speed shearing ultra-fine dispersing machine; and performing instantaneous micromixing dispersion on various components in the nanometer micrometer compound conductive agent to avoid the dead angle of the slurry in a conventional mixing machine so as to achieve the effect of ultra-fine and uniform dispersion. In addition, the solvents and the slurry are added in batches during the whole manufacturing process of the slurry, the temperature of the solvents or the slurry is kept at 60+/-5 DEG C so as to ensure that the nanometer micrometer compound conductive agent and the anode material can severely move at molecular level at a high temperature, and ultra-fine and uniform dispersion of the anode slurry is carried out microcosmically to guarantee the excellent performance and the consistency of the battery.

Description

Technical field: [0001] The invention belongs to the technical field of lithium-ion battery manufacturing, and in particular relates to a preparation method of high-viscosity ultra-fine dispersed cathode slurry for lithium-ion batteries. Background technique: [0002] As a new type of green energy, lithium-ion batteries have been rapidly developing in recent years for portable electronic products such as 3C / 3G mobile phones, notebook computers, tablet computers, cameras, etc., electric vehicles, power supply systems for national defense and military equipment, and photovoltaic energy storage systems, energy storage peak-shifting power stations, uninterruptible power supplies, small and medium-sized energy storage systems, etc. have a wide range of applications future. [0003] Facing the large-scale application requirements of power lithium-ion batteries and energy storage lithium-ion batteries, further improving the power density, energy density, cycle performance, low-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCY02E60/122H01M4/1391H01M4/1397H01M10/0525Y02E60/10
Inventor 刘小虹李国敏余兰李露骆文平黄小
Owner 江西格林德能源有限公司
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