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Cobalt-free system, positive electrode slurry and homogenizing method and application thereof

A positive electrode slurry and system technology, applied to battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as easy layering, large viscosity changes, and difficult dispersion of slurry, achieving short swelling time and good dispersibility Effect

Active Publication Date: 2020-08-25
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation time of this process is very long, which seriously affects the production efficiency, and the solid content of the slurry is low, which easily leads to poor stability of the slurry, and the slurry is easy to separate after a period of time. The second is commonly known as the dry process. First, Put the binder, conductive agent, and active material together in a homogenizer mixer for dry mixing and stirring, and then add a solvent for stirring to prepare a positive electrode slurry. This process is difficult to dissolve due to the addition of a solvent and stirring the binder after dry mixing , resulting in difficult slurry dispersion, poor dispersion effect, and affecting the uniformity of the slurry
[0005] At present, cobalt-free materials are still new materials, and there is no suitable system and homogenization process corresponding to them. If the existing ternary material system and homogenization process are used, the viscosity of the prepared slurry will change greatly after standing. , which is not conducive to the subsequent application

Method used

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  • Cobalt-free system, positive electrode slurry and homogenizing method and application thereof
  • Cobalt-free system, positive electrode slurry and homogenizing method and application thereof

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preparation example Construction

[0044] In a specific embodiment, the chemical formula is Li x Ni y mn z o 2 , wherein x is 1.0-1.1, y is 0.5-0.8, z is the preparation method of the cobalt-free material of 0.2-0.5 comprising the following steps:

[0045] A, the precursor Ni y mn z (OH) 2 , lithium source LiOH and dopant (any one or at least two combinations in Ti, Zr, Al, doping amount is 2000-6000ppm, transition metal=1.04-1.06 in Li / dopant) under stirring condition Mixing is carried out at a mixing speed of 600-1000rpm, and the mixing time is 10-40min to obtain a mixture;

[0046] B. Under the condition of oxygen concentration of 90-100%, the mixture obtained in step A is calcined once. During the first calcining process, the temperature is raised to 930-950 degrees at a heating rate of 1-4 degrees / min, and then kept for 5-15h , to obtain a calcined material;

[0047] C. The primary calcined material obtained in step B is crushed and ground by rollers, and sieved through a 325-mesh sieve to obtain a...

Embodiment 1

[0059] This embodiment provides a cobalt-free system, including 96.5 parts by weight of cobalt-free materials, 1.5 parts by weight of a binder, 1.5 parts by weight of a first conductive agent, 0.5 parts by weight of a second conductive agent, and a pH regulator (added The amount is 0.3% of the dry powder addition amount in the cobalt-free material, binder, first conductive agent and second conductive agent); wherein, the cobalt-free material is LiNi 0.75 mn 0.25 o 2 The binder is polyvinylidene fluoride with a number average molecular weight of 1 million; the conductive agent includes a first conductive agent and a second conductive agent, the first conductive agent is conductive carbon black, and the second conductive agent is a single-walled carbon nanotube; pH The regulator is oxalic acid.

[0060] This embodiment provides a positive electrode slurry, including a glue solution and the above-mentioned cobalt-free system dispersed in the glue solution; the preparation metho...

Embodiment 2

[0070] This embodiment provides a cobalt-free system, including 95.4 parts by weight of cobalt-free materials, 1.8 parts by weight of a binder, 2 parts by weight of a first conductive agent, 0.8 parts by weight of a second conductive agent, and a pH regulator (added The amount is 0.1% of the dry powder addition amount in the cobalt-free material, the binder, the first conductive agent and the second conductive agent); wherein, the cobalt-free material is Li 1.1 Ni 0.8 mn 0.2 o 2 The binder is polyvinylidene fluoride with a number average molecular weight of 500,000; the conductive agent includes a first conductive agent and a second conductive agent, the first conductive agent is conductive carbon black, and the second conductive agent is a single-walled carbon nanotube; pH The regulator is maleic acid.

[0071] This embodiment provides a positive electrode slurry, including a glue solution and the above-mentioned cobalt-free system dispersed in the glue solution; the prepa...

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Abstract

The invention provides a cobalt-free system, positive electrode slurry and a homogenizing method and application thereof. The cobalt-free system comprises a cobalt-free material, a binder, a conductive agent and a pH regulator; the positive electrode slurry comprises a glue solution and a positive electrode material dispersed in the glue solution; and the positive electrode slurry has a relativelylarge viscosity rebound coefficient after standing, and meanwhile, the stability of the coating surface density of the cobalt-free material can be improved, so that the quality of a battery is effectively guaranteed.

Description

technical field [0001] The invention belongs to the field of batteries, and relates to a cobalt-free system, positive electrode slurry and its homogenization method and application. Background technique [0002] With the depletion of traditional energy sources and the increasingly prominent environmental problems, the development direction of lithium-ion batteries as a new type of clean energy has attracted more and more attention, and we are constantly committed to the development and research of more practical and efficient lithium-ion batteries. [0003] Compared with other batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, high open circuit voltage, no memory effect, safety and no pollution. After more than 20 years of rapid development, lithium-ion batteries are widely used in notebook computers, mobile phones, digital cameras, energy storage and other fields. In recent years, with the strengthening of people's awareness of en...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/505H01M4/525H01M4/623H01M4/625H01M4/131H01M10/0525Y02E60/10H01M4/04H01M2004/028
Inventor 苏夏杨红新高旭王代兴周亚林罗必圣马锐
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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