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Battery paste and lithium ion secondary battery made of battery paste

A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as description of battery performance impact, description of positive and negative slurry characteristics, etc., to improve consistency and improve contact area effect

Inactive Publication Date: 2015-01-28
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also no description of the characteristics of the positive and negative electrode slurry, and no description of the impact of the characteristics of the slurry on the performance of the battery under the condition of high-rate charge and discharge

Method used

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  • Battery paste and lithium ion secondary battery made of battery paste

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] The lithium ion secondary battery prepared by the battery slurry provided by the invention, its preparation method comprises the following steps:

[0052] Step 1, making battery slurry, respectively preparing positive electrode slurry and negative electrode slurry. Specifically include:

[0053] In step 1.1, the proportionally weighed electroactive material, conductive agent and binder are preferably stirred in a stirring container of a planetary mixer for a certain period of time.

[0054] In step 1.2, add a certain amount of N-methylpyrrolidone into the stirring container, control the solid-liquid ratio of the slurry, and stir for a certain period of time.

[0055] In step 1.3, add a certain amount of N-methylpyrrolidone, control the solid-liquid ratio, stir for a certain period of time, and monitor the fineness and viscosity.

[0056] Repeat step 1.3 until the slurry fineness reaches the required value or is close to the particle size of the largest particle in the...

Embodiment 1

[0069] The positive electrode slurry contains 90 parts by mass of spinel lithium manganate, 3 parts by mass of Super-P, 2 parts by mass of KS-6, 5 parts by mass of polyvinylidene fluoride, and the largest primary particle of spinel lithium manganate The particle size is 14.5 microns, the median diameter is 10 microns, the slurry fineness is 18 microns, and the slurry viscosity is 7500mPa·s; the negative electrode slurry contains 85 parts by mass of spinel lithium titanate, 8 parts by mass of Super-P, and 2 parts by mass Parts of superconducting carbon black, 5 parts by mass of polyvinylidene fluoride, the largest primary particle size of spinel lithium titanate is 300 nanometers, the fineness of the slurry is 5 microns, and the viscosity of the slurry is 4200 mPa·s. The positive electrode of the lithium-ion battery is made of positive electrode slurry, and the negative electrode is made of negative electrode slurry.

Embodiment 2

[0071] The positive electrode slurry contains 90 parts by mass of spinel lithium manganate, 3 parts by mass of Super-P, 2 parts by mass of KS-6, 5 parts by mass of polyvinylidene fluoride, and the largest primary particle of spinel lithium manganate The particle size is 14.5 microns, the median diameter is 10 microns, the slurry fineness is 18 microns, and the slurry viscosity is 7500 mPa s; the negative electrode slurry contains 88 parts by mass of spinel lithium titanate, 7 parts by mass of Super-P, and 1 mass part Parts of carbon nanotubes, 4 parts by mass of polyvinylidene fluoride, the largest primary particle size of spinel lithium titanate is 150 nanometers, the fineness of the slurry is 3 microns, and the viscosity of the slurry is 3800 mPa·s. The positive electrode of the lithium-ion battery is made of positive electrode slurry, and the negative electrode is made of negative electrode slurry.

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Abstract

The invention discloses battery paste and a lithium ion secondary battery made of the battery paste. The battery paste comprises positive electrode paste and negative electrode paste. The fineness of the positive electrode paste is smaller than 20 microns, and the viscosity range of the positive electrode paste is 6500 mPa.s-7500 mPa.s. The fineness of the negative electrode paste is smaller than 5 microns, and the viscosity range of the negative electrode paste is 3800 mPa.s-4200 mPa.s. The positive electrode paste includes positive electrode electro-active substances, conductive agents, adhesion agents and solvents. The negative electrode paste includes negative electrode electro-active substances, conductive agents, adhesion agents and solvents. The invention further provides the lithium ion secondary battery made of the battery paste. The battery paste is good in dispersity, the lithium ion secondary battery made of the battery paste is excellent in high-rate cycling performance, and long-time high-rate charging of a lithium ion battery with lithium titanate as a negative electrode is achieved, and long-time high-rate cycling charging and discharging stability is high.

Description

technical field [0001] The invention relates to a battery slurry in lithium ion secondary battery technology and a lithium ion secondary battery produced therefrom, in particular to a battery slurry and a lithium ion secondary battery produced therefrom. Background technique [0002] Lithium-ion batteries were successfully commercialized in the 1990s, and the metal lithium anode, which had serious safety problems, was replaced by a graphite anode. Today, lithium-ion batteries with graphite anode systems are still the mainstream of lithium-ion batteries. However, since graphite intercalation occurs at 0V~0.25V (v.s. Li / Li + ), which is very close to the deposition potential of lithium ions at 0 volts (relative to Li / Li + ), due to the existence of polarization in the electrochemical reaction process, the lithium-ion battery of the graphite system will inevitably generate lithium dendrites on the graphite when it is charged with a large current, causing the internal short ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/62H01M10/0525
CPCH01M4/136H01M4/1397H01M4/62H01M10/0525Y02E60/10
Inventor 马尚德简德超张熠霄晏莉琴冯毅解晶莹
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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