Lithium ion battery cathode slurry and preparation method thereof

A lithium-ion battery and positive electrode slurry technology, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as failure, battery swelling, and long time consumption, and achieve long service life, prolong service life, and improve rapid conduction Effect

Inactive Publication Date: 2019-05-17
上海力信能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes a long time, and the added Li 2 CO 3 It is easy to decompose and produce gas in flexible packaging batteries, resulting in battery swelling or even failure

Method used

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  • Lithium ion battery cathode slurry and preparation method thereof
  • Lithium ion battery cathode slurry and preparation method thereof
  • Lithium ion battery cathode slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of lithium-ion battery cathode slurry, specifically comprising the steps of:

[0034] First, according to the ratio in Table 1, add the active material, conductive agent, additive and binder into the double planetary mixing tank, stir for 30 minutes until the powder is fully mixed; add 12% N-methylpyrrolidone by weight of all solid components After that, turn on the revolution and stir for 60 minutes; add N-methylpyrrolidone of 16% by weight of all solid components, turn on the revolution and disperse and stir for 120 minutes, and test the viscosity of the slurry to be 4000-6000mpa s; vacuumize for 30 minutes and filter to obtain the positive electrode slurry material.

Embodiment 2

[0037] A preparation method of lithium-ion battery cathode slurry, specifically comprising the steps of:

[0038] First, according to the ratio in Table 1, add the active material, conductive agent, additive and binder into the double planetary mixing tank, stir for 30 minutes until the powder is fully mixed; add 16% N-methylpyrrolidone by weight of all solid components After that, turn on the revolution and stir for 60 minutes; add N-methylpyrrolidone of 16% by weight of all solid components, turn on the revolution and disperse and stir for 120 minutes, and test the viscosity of the slurry to be 4000-6000mpa s; vacuumize for 30 minutes and filter to obtain the positive electrode slurry material.

Embodiment 3

[0041] A preparation method of lithium-ion battery cathode slurry, specifically comprising the steps of:

[0042] First, according to the ratio in Table 1, add the active material, conductive agent, additive and binder into the double planetary mixing tank, stir for 30 minutes until the powder is fully mixed; add 50% N-methylpyrrolidone by weight of all solid components After that, turn on the revolution and stir for 60 minutes; add N-methylpyrrolidone with 32% weight of all solid components, turn on the revolution and disperse and stir for 120 minutes, and test the viscosity of the slurry to be 6000-8000mpa s; vacuumize for 30 minutes and filter to obtain the positive electrode slurry material.

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Abstract

The invention discloses lithium ion battery cathode slurry and a preparation method thereof. A nanometer titanium aluminum phosphate powder additive is added to the cathode slurry to improve the lithium ion conductivity of a cathode; under the condition that the compaction density of a cathode material is increased and an electrolyte can not be fully infiltrated, the rapid conduction of a lithiumion can be improved, and the high power discharge performance of a battery can be improved; on the other hand, nanometer titanium aluminum lithium phosphate powder is uniformly wrapped on the surfaceof a cathode active material, the contact between the cathode material and the electrolyte can be reduced to a certain extent, the oxidation and decomposition of the electrolyte in a charged state isreduced, the consumption of the electrolyte is reduced, and the service life of the battery is prolonged; and the lithium battery prepared by the cathode slurry of the lithium battery, the energy density is high, the high temperature performance is excellent, the high power discharge performance is good, the cycle performance is good, and the service life is long. According to the preparation method, directly stirring and mixing is realized by using common stirring equipment, operating is convenient, and large-scale production can be realized.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery cathode slurry and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between the two electrodes, when charging, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] Lithium-ion batteries have the characteristics of high specific capacity, small self-discharge, wide operating temperature range, high voltage platform, long cycle life, no memory effect, and environmental friendliness. They have been widely used in mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/04H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 杜立成朱清陈启多肖俊
Owner 上海力信能源科技有限责任公司
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