Lithium ion battery

A lithium-ion battery, lithium iron phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of immature zinc-ion battery technology, fast capacity decay, low power consumption, etc., and achieve excellent battery cycle performance, The effect of reducing electrochemical polarization and improving low temperature performance

Pending Publication Date: 2021-09-03
廖福宁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The batteries in the prior art have the following disadvantages: dry batteries cannot be charged and used, and the cost of use is high. Due to the heavy metals contained, the environment is seriously polluted; , if it is not used after charging, its capacity decays quickly; ordinary lithium-ion batteries step down 1.5V output, the cost is high (the price of a single unit is more than 10 yuan), and it is not safe (based on 3.7V / 3.2V lithium-ion batteries that are prone to explosion and combustion, etc. Hidden dangers), short service life (generally about 300 times of charging and discharging), unstable performance of the step-down board, easy to cause failure of charging and discharging; high cost of lithium-iron batteries, short service life; immature technology of zinc-ion batteries, ultra-short service life
Carbon materials have a low potential to lithium (0-0.2V). When the battery is overcharged or charged and discharged with a high current, it is easy to precipitate metal lithium on the electrode surface, causing an internal short circuit in the battery, and then thermal runaway leads to fire or even explosion of the battery, which brings serious safety. Hidden danger

Method used

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Examples

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preparation example Construction

[0078] The preparation method of lithium ion battery of the present invention comprises the following steps:

[0079] (a) Ingredients: According to the formula, the positive electrode slurry and the negative electrode slurry were respectively prepared by vacuum stirring;

[0080] (b) Coating: According to the process design, the positive electrode slurry and the negative electrode slurry are respectively coated on the positive electrode base material and the negative electrode base material to make rolls of positive electrode sheets and negative electrode sheets;

[0081] (c) Roll cutting: According to the process design, the positive pole piece and the negative pole piece are compacted and cut to make the required pole piece;

[0082] (d) Assembly: As required, assemble into cylindrical, square, polymer flexible packaging, etc.;

[0083] (e) Liquid injection: inject the corresponding electrolyte according to the battery performance requirements;

[0084] (f) Activation and ...

Embodiment 1

[0089] A lithium-ion battery, comprising a positive electrode material, a negative electrode material, an electrolyte, a separator, a positive electrode matrix, and a negative electrode matrix;

[0090] The positive electrode material is made of a positive electrode active material with a mass ratio of 95:2:3:50, a positive electrode conductive agent, a positive electrode binder and a positive electrode solvent; the positive electrode active material is lithium cobaltate, and the positive electrode conductive agent is Carbon nanotubes, the positive electrode binder is PVDF, the positive electrode solvent is N-methylpyrrolidone; the viscosity of the positive electrode slurry is 12000mPa·s;

[0091] The negative electrode material is made of negative electrode active material, negative electrode conductive agent, negative electrode binder and negative electrode solvent with a mass ratio of 96:1.5:2.5:130; the negative electrode active material is lithium titanium phosphate, and t...

Embodiment 2

[0095] A lithium-ion battery, comprising a positive electrode material, a negative electrode material, an electrolyte, a separator, a positive electrode matrix, and a negative electrode matrix;

[0096] The positive electrode material is made of a positive electrode active material, a positive electrode conductive agent, a positive electrode binder and a positive electrode solvent with a mass ratio of 90:3.5:6.5:40; the positive electrode active material is lithium vanadium phosphate, and the positive electrode conductive agent is Carbon nanotubes, the positive electrode binder is PVDF, the positive electrode solvent is N-methylpyrrolidone; the viscosity of the positive electrode slurry is 13000mPa·s;

[0097] The negative electrode material is made of negative electrode active material, negative electrode conductive agent, negative electrode binder and negative electrode solvent with a mass ratio of 92:3.5:4.5:120; the negative electrode active material is lithium titanium pho...

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Abstract

The invention relates to the technical field of batteries, in particular to a lithium ion battery. The lithium ion battery comprises a positive electrode material and a negative electrode material, the positive electrode material is mainly prepared from a positive electrode active material, a positive electrode conductive agent, a positive electrode adhesive and a positive electrode solvent; the positive electrode active material comprises at least one of lithium cobalt oxide, lithium vanadium phosphate, lithium iron phosphate, lithium iron phosphate, nickel cobalt lithium manganate and lithium manganate; the negative electrode material is mainly prepared from a negative electrode active material, a negative electrode conductive agent, a negative electrode adhesive and a negative electrode solvent; the negative electrode active material comprises at least one of lithium titanium phosphate, lithium iron phosphate, lithium titanate and titanium niobate. The working platform of the lithium ion battery disclosed by the invention is stabilized between 1.30 V and 1.60 V, and the lithium ion battery has excellent battery cycle performance, longer service life and very high charging speed; and electrochemical polarization can be reduced, so that the low-temperature performance of the battery is improved, and charging and discharging at -40 DEG C can be realized.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium ion battery. Background technique [0002] The batteries in the prior art have the following disadvantages: dry batteries cannot be charged and used, and the cost of use is high. Due to the heavy metals contained, the environment is seriously polluted; , if it is not used after charging, its capacity decays quickly; ordinary lithium-ion batteries step down 1.5V output, the cost is high (the price of a single unit is more than 10 yuan), and it is not safe (based on 3.7V / 3.2V lithium-ion batteries that are prone to explosion and combustion, etc. Hidden dangers), short service life (generally about 300 times of charging and discharging), unstable performance of the step-down board, easy to cause failure of charging and discharging; high cost of lithium-iron batteries, short service life; immature technology of zinc-ion batteries, ultra-short service life . [0003] At ...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/485H01M4/58H01M4/62
CPCH01M10/0525H01M4/485H01M4/5825H01M4/621Y02E60/10
Inventor 廖福宁
Owner 廖福宁
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