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Aqueous positive paste and preparation method thereof

A positive electrode slurry and water-based technology, applied in the field of electrochemistry, can solve the problems of poor flexibility, poor fluidity, and poor stability of the positive electrode sheet, and achieve the effects of improving electrochemical performance, reducing battery internal resistance, and improving flexibility

Inactive Publication Date: 2017-05-17
TIANJIN SINOPOLY NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a water-based positive electrode slurry and its preparation in order to overcome the defects of poor fluidity, poor stability and poor flexibility of the positive electrode sheet prepared from the slurry in the existing water-based positive electrode slurry. method

Method used

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  • Aqueous positive paste and preparation method thereof
  • Aqueous positive paste and preparation method thereof
  • Aqueous positive paste and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] This embodiment provides a kind of water-based positive electrode slurry, positive electrode sheet and lithium ion battery and its preparation:

[0044] One, the preparation of aqueous positive electrode slurry, comprises the steps:

[0045] Step 1. Add 0.4 parts by weight of polyvinylpyrrolidone (PVP), 0.5 parts by weight of ethylene carbonate and 10 parts by weight of deionized water to the mixer, stir at a medium speed of 800rpm for 0.5h, and obtain glue A after stirring evenly;

[0046] Step 2: Add 5 parts by weight of LA133 and 40 parts by weight of deionized water into the mixer, stir at a medium speed of 800rpm for 0.5h, and obtain glue B after stirring evenly;

[0047] Step 3: Add glue A, 2 parts by weight of conductive carbon black, and 1 part by weight of conductive graphite to glue B, and stir at a high speed of 1500 rpm for 90 minutes;

[0048] Step 4: Add two equal parts of 92 parts by weight of nano-lithium iron phosphate into the agitator in turn, and th...

Embodiment 2

[0058] This embodiment provides a kind of water-based positive electrode slurry, positive electrode sheet and lithium ion battery and its preparation:

[0059] One, the preparation of aqueous positive electrode slurry, comprises the steps:

[0060] Step 1. Add 0.5 parts by weight of polyvinylpyrrolidone (PVP), 0.8 parts by weight of ethylene carbonate and 10 parts by weight of deionized water into the mixer, stir at a medium speed of 800 rpm for 0.5 h, and obtain glue A after stirring evenly;

[0061] Step 2: Add 3.5 parts by weight of LA133 and 40 parts by weight of deionized water into the mixer, stir at a medium speed of 800rpm for 0.5h, and obtain glue B after stirring evenly;

[0062] Step 3: Add glue A, 2 parts by weight of conductive carbon black, and 1 part by weight of conductive graphite to glue B, and disperse at a high speed of 1500 rpm for 90 minutes;

[0063] Step 4: Add two equal parts of 92 parts by weight of nano-lithium iron phosphate into the agitator in tu...

Embodiment 3

[0069] This embodiment provides a kind of water-based positive electrode slurry, positive electrode sheet and lithium ion battery and its preparation:

[0070] One, the preparation of aqueous positive electrode slurry, comprises the steps:

[0071] Step 1. Add 0.8 parts by weight of polyvinylpyrrolidone (PVP), 1 part by weight of ethylene carbonate and 10 parts by weight of deionized water into the mixer, stir at a medium speed of 800rpm for 0.5h, and obtain glue A after stirring evenly;

[0072] Step 2: Add 5 parts by weight of LA133 and 40 parts by weight of deionized water into the mixer, stir at a medium speed of 800rpm for 0.5h, and obtain glue B after stirring evenly;

[0073] Step 3. Add glue A, 2 parts by weight of conductive carbon black, and 1 part by weight of conductive graphite to the glue solution B, and disperse and stir at a high speed for 90 minutes at a speed of 1500 rpm;

[0074] Step 4: Add two equal parts of 92 parts by weight of nano-lithium iron phospha...

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Abstract

The invention discloses an aqueous positive paste. The aqueous positive paste comprises the following constituents based on parts by mass: 85-95 parts of nanometer lithium iron phosphate, 3-45 parts of aqueous adhesive, 1-6 parts of composite conductive agent, 0.1-1 part of dispersing agent, 0.5-5 parts of plasticizer and 55-85 parts of deionized water, wherein the composite conductive agent comprises a fixed constituent and an additive constituent, and the mass ratio of the fixed constituent and the additive constituent is 1:(0.3-4.5). In an aqueous positive paste system, the deionized water is used as a solvent, the dispersing agent and the plasticizer in specific content are matched, the flexibility of a positive pole plate which is subsequently prepared from the aqueous positive paste is greatly improved on the basis of achieving environment-friendly requirement, and the aqueous positive paste has high application prospect. Meanwhile, with the application of the special conductive agent in the aqueous positive paste system, the electrochemical performance of a battery is further improved.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to an aqueous cathode slurry and a preparation method thereof. Background technique [0002] Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have the advantages of higher energy density, small self-discharge, and long cycle life. They have been widely used in the fields of consumer electronics and power batteries. At present, the cathode slurry of lithium-ion batteries generally uses fluorine-containing polymers such as polyvinylidene fluoride as a binder and NMP (N-methylpyrrolidone) as a solvent. Because organic solvents are easy to cause environmental pollution and cause harm to the health of operators, it is necessary to increase cost input to recover organic solvents during the coating and drying process. At the same time, the cost of NMP is relatively high, which increases the production cost of the battery....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/621H01M4/622H01M4/625Y02E60/10
Inventor 秦怀鹏王震赵政威马紫峰
Owner TIANJIN SINOPOLY NEW ENERGY TECH
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