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A high energy density lithium-ion battery

A lithium-ion battery, high energy density technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low conductivity, tap density and ion diffusion rate of lithium iron phosphate power batteries, and achieve optimal cycle stability It has the effect of solving low temperature lithium precipitation and preventing gas inflation

Active Publication Date: 2018-10-19
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies of the existing technology, it provides a lithium-ion battery with high energy density and long cycle life, and solves the problems of the existing lithium iron phosphate power battery such as low conductivity, tap density and ion diffusion rate, thereby improving the high Kinetic and electrochemical performance of energy-dense lithium-ion batteries

Method used

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  • A high energy density lithium-ion battery
  • A high energy density lithium-ion battery
  • A high energy density lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of positive electrode: active material A is LiFePO 4 , the active material B is LiFeBO 3 , its weight content is 89% and 1% respectively; With polyvinylidene fluoride (PVDF) as binder, its weight content is 5%; With carbon black as conductive agent, its weight content is 5%; Active material A and active material B are uniformly mixed by ball milling, wherein active material A is uniformly coated on the surface of active material B after ball milling; then sintered at 700°C, and the obtained active material is mixed with polyvinylidene fluoride and conductive carbon Mix and add into N-methylpyrrolidone (NMP) and stir evenly to make positive electrode slurry; evenly coat the positive electrode slurry on the positive electrode current collector aluminum foil, dry and compact, cut into pieces, and weld the positive electrode lugs to obtain positive electrode.

[0041] Preparation of the negative electrode: use graphite as the negative electrode active material...

Embodiment 2

[0046] Preparation of positive electrode: active material A is LiFePO 4 , the active substance B is Li 2 FeSiO 4 , its weight content is 97.5% and 1% respectively; With polyvinylidene fluoride (PVDF) as binding agent, its weight content is 1%; With carbon black as conductive agent, its weight content is 0.5%; Active material B is uniformly mixed with active material A by ball milling, wherein active material B is uniformly coated on the surface of active material A after ball milling; then sintered at 950°C, and the obtained active material is mixed with polyvinylidene fluoride and conductive carbon Mix and add into N-methylpyrrolidone (NMP) and stir evenly to make positive electrode slurry; evenly coat the positive electrode slurry on the positive electrode current collector aluminum foil, dry and compact, cut into pieces, and weld the positive electrode lugs to obtain positive electrode.

[0047] Preparation of the negative electrode: use silicon powder as the negative el...

Embodiment 3

[0052] Different from Example 1, the preparation of positive electrode: active material A is LiFePO 4 , the active substance B is Li 2 FeSiO 4 , its weight content is respectively 83% and 7%, with polyvinylidene fluoride (PVDF) as binding agent, its weight content is 5%; With carbon black as conductive agent, its weight content is 5%; Active material A and active material B are uniformly mixed by ball milling, wherein active material A is uniformly coated on the surface of active material B after ball milling; then sintered at 750°C, and the obtained active material is mixed with polyvinylidene fluoride and conductive carbon Mix and add into N-methylpyrrolidone (NMP) and stir evenly to make positive electrode slurry; evenly coat the positive electrode slurry on the positive electrode current collector aluminum foil, dry and compact, cut into pieces, and weld the positive electrode lugs to obtain positive electrode.

[0053] The rest are the same as in Embodiment 1, and will...

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Abstract

The present invention relates to a lithium ion battery with a high energy density, in particular to a lithium ion battery with a high energy density. The battery comprises a cathode, an anode, a diaphragm between the cathode and the anode and an electrolyte. The cathode comprises a cathode current collector and a cathode active material layer; the anode comprises an anode current collector and an anode active material layer; and the cathode active material layer comprises the following components in percentage by weight: 60-97.5% of an active material A, 1-25% of an active material B, 1-7% of polyvinylidene fluoride and 0.5-8% of conductive carbon. Compared with the prior art, the lithium ion battery with high energy density has the features that by mixing the active material A and the active material B, the defect of only using A and B is overcome, and the lithium ion battery with a high energy density and a long cycle life is prepared.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with high energy density. Background technique [0002] With the rapid development of the battery industry, the specific energy of secondary batteries is constantly increasing, from 30-40Wh / kg for lead-acid batteries, 40-50Wh / kg for nickel-cadmium batteries, and 60-80Wh / kg for nickel-metal hydride batteries. Up to now, the lithium-ion battery is 100-150Wh / kg. [0003] Among all secondary batteries, lithium-ion batteries have been widely used in various fields due to their high specific energy, high specific power, long cycle life, and good high-temperature performance. [0004] However, with the rapid development of electric vehicles, wind energy, and solar energy, larger capacity and more durable lithium-ion batteries are required for electric vehicles and their energy storage. At present, the energy density of commercialized electric vehicl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 刘陟王程周燎源丁美珍
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD