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Preparation method of lithium ferric phosphate cathode slurry

A technology of lithium iron phosphate and positive electrode slurry, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of long dispersion time of positive electrode slurry, large specific surface area of ​​conductive agent, high comprehensive cost, and save labor. Cost and energy consumption, good low temperature and cycle performance, the effect of streamlining the batching process

Inactive Publication Date: 2017-01-18
OPTIMUM BATTERY CO LTD
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Problems solved by technology

However, due to the large specific surface area and strong liquid absorption of the conductive agent, after adding the conductive agent to the solvent, the positive electrode slurry is paste-like, while the particle size of lithium iron phosphate is small, and the D50 is only a few microns, so it is easy to agglomerate. Long dispersion time, high energy consumption and high comprehensive cost

Method used

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  • Preparation method of lithium ferric phosphate cathode slurry
  • Preparation method of lithium ferric phosphate cathode slurry
  • Preparation method of lithium ferric phosphate cathode slurry

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preparation example Construction

[0024] The invention provides a preparation method of lithium iron phosphate positive electrode slurry, comprising the following steps:

[0025] Step 1: Add lithium iron phosphate powder and adhesive powder into the mixing tank respectively, and perform the first stirring;

[0026] Step 2: Add all the solvent, turn on the cooling water, carry out the second stirring, and scrape the material after the second stirring;

[0027] Step 3: Adjust the rotating speed of the mixing tank to disperse the slurry obtained in Step 2 at a high speed;

[0028] Step 4: Add the conductive agent for the third stirring, and scrape the material after the third stirring;

[0029] Step 5: Adjust the rotation speed of the mixing tank, and vacuum defoam the slurry obtained in Step 4.

[0030] Specifically, in the first step, the rotation speed of the stirring tank for the first stirring is: 0-800 rpm for rotation, 0-40 rpm for revolution, and the stirring time for the first time is 5-60 minutes.

...

Embodiment

[0038] (1) Add lithium iron phosphate and adhesive powder into the mixing tank respectively, the rotation speed of the mixing tank is: rotation 200rpm, revolution 38rpm, and the mixing time is 20min;

[0039] (2) Add all the NMP (N-methylpyrrolidone) solvent, turn on the cooling water, the rotation speed of the stirring tank is: rotation 200rpm, revolution 38rpm, stirring time is 30min, scrape the material after stirring;

[0040] (3) The rotation speed rotation of the mixing tank is adjusted to: autobiography 1350rpm, revolution 38rpm, and continue to stir for 30min;

[0041] (4) Add SP and KS-6 conductive agent and stir for 30 minutes, and scrape the material after stirring;

[0042] (5) Adjust the rotating speed and rotation of the mixing tank as follows: the rotation is 1350rpm, the revolution is 38rpm, the vacuum degree is less than or equal to -0.085MPa, scrape the material after stirring for 60min, and continue stirring for 120min;

[0043] (6) Turn off the rotation of...

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Abstract

The invention provides a preparation method of lithium ferric phosphate cathode slurry. The preparation method comprises the following steps that 1, lithium ferric phosphate powder and adhesive powder are added to a stirring tank, and first-time stirring is performed; 2, all solvents are added, cooling water is added, second-time stirring is performed, and material scraping is performed after the second-time stirring is completed; 3, the rotating speed of the stirring tank is adjusted, and high-speed dispersion is conducted on the obtained slurry in the step 2; 4, a conductive agent is added to perform third-time stirring, and material scraping is performed after the third-time stirring is completed; 5, the rotating speed of the stirring tank is adjusted, and vacuum defoamation is conducted on the slurry obtained in the step 4. The lithium ferric phosphate cathode slurry prepared by adopting the preparation method is good in dispersion effect and uniform in mixing, a burdening process is simplified, and the labor costs and energy consumption are reduced. The inner resistance, multiplying power, low temperature and cycling performance of a lithium ion battery using the prepared lithium ferric phosphate cathode slurry as an anodic active material are good.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of lithium iron phosphate cathode slurry. [0003] 【Background technique】 [0004] With the wide application and rapid development of lithium-ion batteries, people have higher and higher performance requirements for lithium-ion batteries, not only requiring lithium-ion batteries to have a higher capacity, but also requiring better performance during repeated charging and discharging. capacity retention, exhibits good cycle performance, and has a long service life. The cathode is the most important part of the lithium-ion battery, and the preparation of the cathode slurry directly affects the core electrochemical performance of the lithium-ion battery. [0005] At present, the lithium iron phosphate positive electrode slurry usually pre-dissolves the binder, and adopts the method of preferentially dispersing the conductive agent and then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/139H01M10/0525C01B25/45
CPCC01B25/45H01M4/139H01M4/5825H01M10/0525Y02E60/10
Inventor 柯善钦傅昭张正飞林真龙
Owner OPTIMUM BATTERY CO LTD
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