Lithium battery silicon carbon negative electrode slurry and preparation method thereof, and lithium ion battery
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A negative electrode slurry, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slurry settlement and delamination, and achieve the effect of stable surface density
Active Publication Date: 2019-06-07
TIANJIN ENERGIES
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[0005] In view of this, the present invention aims to propose a silicon-carbon negative electrode slurry for a lithium battery and a preparation method thereof, and a lithium-ion battery to solve the problem that the existing negative electrode slurry will appear as the time increases under standing conditions. Subsidence and stratification problems
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Embodiment 1
[0039] A lithium battery silicon carbon negative electrode slurry, comprising the following components in parts by mass: 12 parts of silicon carbon; 80 parts of graphite; 2 parts of a first conductive agent; 0.3 parts of a second conductive agent; 5 parts of a binder; 50 parts of water share,
[0040] Wherein, the binder is polyacrylic acid, the first conductive agent is SP, and the second conductive agent is ultralong linear carbon nanotubes, the aspect ratio of the carbon nanotubes is 15,000-30,000, and the diameter is 1-100 nm. The carbon nanotubes are mixed with sodium carboxymethyl cellulose, and the mass ratio of the sodium carboxymethyl cellulose to the carbon nanotubes is 4:100˜5:100.
Embodiment 2
[0042] The preparation method of the lithium battery silicon carbon negative electrode slurry described in embodiment 1 comprises the following steps:
[0043] Step 1: Disperse 2 parts of the first conductive agent, 0.3 parts of the second conductive agent, 2.5 parts of the binder, and 25 parts of water. The dispersion line speed is 15m / s, the dispersion temperature is 25°C, and the dispersion time is 120min. a mixture;
[0044] Step 2: Add 12 parts of silicon carbon to the above first mixture, and disperse, the dispersion line speed is 8m / s, the dispersion temperature is 25°C, and the dispersion time is 30min, to obtain the second mixture;
[0045] Step 3: add 80 parts of graphite to the above second mixture, and disperse, the dispersion line speed is 8m / s, the dispersion temperature is 25°C, and the dispersion time is 120min, to obtain the third mixture;
[0046] Step 4: Add 2.5 parts of binder and 25 parts of water to the above-mentioned third mixture, and disperse, the di...
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Abstract
The invention provides a lithium battery silicon carbon negative electrode slurry. The slurry includes, by mass, 10-30 parts of silicon carbon, 70-90 parts of graphite, 1-3 parts of a first conductiveagent, 0.1-1 part of a second conductive agent, 3-5 parts of a binder, and 40-70 parts of water; the binder is polyacrylic acid; the second conductive agent is an ultra-long linear carbon nanotube; and the carbon nanotube contains dispersing agent carboxymethylcellulose sodium. The stable silicon carbon negative electrode slurry having reversibility can be prepared; after the preparation of the slurry is completed, the slurry tends to be stable and is similar to jelly after standing for about 0.5 hour, the viscosity of the slurry cannot be increased with time, and settlement and stratification cannot occur with long-time placing; dispersing can be performed on the slurry before coating, and the slurry can be recovered to a flow state; and the slurry can be similar to jelly again after standing for about 0.5 hour, so that long-time storage can be achieved, follow-up coating effects cannot be influenced, and surface density is stable and leveling property is good.
Description
technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a silicon-carbon negative electrode slurry for a lithium battery, a preparation method thereof, and a lithium-ion battery. Background technique [0002] At present, with the increasing demand for high-capacity and long-life batteries in the lithium battery industry, people have put forward higher requirements for the performance of lithium-ion batteries. The low capacity of lithium-ion batteries has become a bottleneck restricting the development of the battery industry. It has become a development direction in the field of battery materials to find higher specific capacity cathode materials and anode materials. [0003] The current commercial negative electrode material is carbon. Since the commercialization of lithium-ion batteries, the research on carbon materials has made great progress. The actual specific capacity has increased rapidly, and it is c...
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