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Lithium iron phosphate system lithium ion battery and preparation method thereof

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of phosphate, phosphorus oxyacid, secondary battery, etc., can solve the problems of high cost, unsatisfactory cycle performance, difficult processability of negative electrode materials, etc., and achieve easy processing. , good electrochemical performance, excellent discharge performance

Inactive Publication Date: 2017-08-15
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are that the anode material is difficult to process, the cost is high, and the cycle performance is not very ideal.

Method used

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  • Lithium iron phosphate system lithium ion battery and preparation method thereof
  • Lithium iron phosphate system lithium ion battery and preparation method thereof
  • Lithium iron phosphate system lithium ion battery and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0045] The preparation method of the lithium iron phosphate system lithium ion battery of the present invention comprises the following steps:

[0046] S1: positive electrode sheet production, the positive electrode material is uniformly mixed in N-methylpyrrolidone organic solvent according to the conventional process to make positive electrode slurry, and the positive electrode slurry is coated on the positive electrode current collector, Baking and cold pressing into a sheet structure, and then die-cutting the sheet structure to obtain a finished positive electrode sheet;

[0047] S2: Negative electrode sheet production, the negative electrode material is uniformly mixed in the carboxymethyl cellulose glue according to the conventional process, and the binder is added to make the negative electrode slurry, and the negative electrode slurry is coated on the negative electrode current collector, Baking and cold-pressing into a sheet-like structure, and then die-cutting the sh...

Embodiment 1

[0057] A lithium iron phosphate lithium-ion battery, comprising a battery casing, a core body in the casing, and an electrolyte filled in the casing, the core body is composed of a positive electrode sheet, a negative electrode sheet, and is attached between the positive electrode sheet and the negative electrode sheet diaphragm composition. The positive electrode sheet and the negative electrode sheet are respectively composed of positive and negative electrode collectors and positive and negative electrode materials coated on the positive and negative electrode collectors.

[0058] The positive electrode active material used in the positive electrode material is lithium iron phosphate material, the conductive agent is conductive carbon black, and the positive electrode binder is polyvinylidene fluoride. Wherein, the mass percentage of lithium iron phosphate material in the positive electrode material is 96.5%, the mass percentage of conductive carbon black is 1.5%, and the m...

Embodiment 2

[0067] In the lithium iron phosphate lithium ion battery in this embodiment, the fabrication of the positive electrode sheet, the fabrication of stacked cores, and the formation after liquid injection are completely consistent with those in Embodiment 1 of the present invention. The difference is that in Example 2, the production of the negative electrode sheet: the negative electrode material is uniformly mixed in carboxymethyl cellulose glue according to the conventional process to make the negative electrode slurry, and the negative electrode slurry is evenly coated on the copper foil to make On the negative electrode current collector with a thickness of 6um, it is cold pressed after baking, and the compacted density is 1.60g / cm 3 , the thickness of the prepared negative electrode sheet was 104 μm. Then, the negative electrode sheet was die-cut to obtain a finished negative electrode sheet with a size of 195 mm×237.5 mm.

[0068] In addition, the electrolyte solution of t...

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Abstract

The invention discloses a lithium iron phosphate system lithium ion battery. The lithium iron phosphate system lithium ion battery comprises a shell, a lamination core body arranged in the shell, and an electrolyte solution injected into the shell; the lamination core body comprises a positive plate, a negative plate, and a diaphragm arranged between the positive plate and the negative plate; a cathode material comprises a cathode active substance; an anode material comprises an anode active substance; the cathode active substance is lithium iron phosphate; the anode active substance comprises at least one ingredient selected from natural graphite, artificial graphite, mesophase carbon microsphere, and polymer carbon; the electrolyte solution comprises at least one or a plurality of electrolytes selected from LiPF6, LiBF4, and LiAsF6. The lithium iron phosphate system lithium ion battery is excellent in cycling performance, and is high in energy density; and large-scale production of the lithium iron phosphate system lithium ion battery can be easily realized.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium iron phosphate system lithium ion battery and a preparation method thereof. Background technique [0002] Due to the high safety, long life, low cost and high voltage platform of lithium iron phosphate cathode materials, it is widely used in new energy vehicles, including pure electric vehicles (EVs), hybrid electric vehicles (HEVs) and plug-in hybrid electric vehicles. Vehicles (PHEVs) are widely used. However, compared with other power cathode materials, the mass energy density of lithium iron phosphate lithium-ion batteries is relatively low, and the power batteries prepared by the industry are only about 130Wh / kg. Limited by the low energy density of the lithium iron phosphate system, currently lithium iron system batteries are mainly used for buses with large battery packs, communication base stations and energy storage base stations, while small pas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/62H01M10/0568H01M10/0525C01B25/37C01B25/45C01B25/26
CPCH01M4/58H01M4/583H01M4/62H01M10/0525H01M10/0568C01B25/26C01B25/375C01B25/45Y02E60/10
Inventor 余开明陈怀胜陈小平李小兵
Owner SOUNDON NEW ENERGY TECH CO LTD
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