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Lithium iron phosphate power battery with improved low temperature charge performance

A lithium iron phosphate, charging performance technology, applied in the field of lithium iron phosphate power batteries, can solve the problems of reducing the effective capacity of the negative electrode, reducing the degree of graphitization, etc., to reduce the negative electrode interface impedance, improve low-temperature performance, and have no negative impact on energy density Effect

Inactive Publication Date: 2018-07-20
CAMEL GRP WUHAN OPTICS VALLEY R&D CENT CO LTD
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AI Technical Summary

Problems solved by technology

[0006] However, softening, hard carbon or reducing the degree of graphitization and reducing the particle size all reduce the effective capacity of the negative electrode. Therefore, the above methods all improve the low-temperature charging performance under the premise of sacrificing the energy density of the battery to a certain extent.

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Embodiment Construction

[0017] The invention discloses a lithium iron phosphate power battery with improved low-temperature charging performance, comprising a positive pole piece, a negative pole piece and an electrolyte.

[0018] The positive electrode sheet contains lithium iron phosphate, positive electrode composite conductive agent, positive electrode binder, and aluminum foil coated with conductive carbon on the surface. Lithium iron phosphate is prepared by using iron phosphate as the precursor, and its primary particle size is 100-300 nanometers; the positive electrode composite conductive agent contains conductive carbon black (SP), carbon nanotubes (CNTs), flake conductive graphite (KS- 6) Two or more components of vapor grown carbon fiber (VGCF), Ketjen black (ECP), and acetylene black (AB), the positive electrode binder is polyvinylidene fluoride (PVDF); the surface The aluminum foil coated with conductive carbon has a thickness of 15 microns as the base material of the aluminum foil, and...

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Abstract

The invention discloses a lithium iron phosphate power battery with an improved low temperature charge performance, belongs to the technical field of lithium iron phosphate power batteries, and aims to solve the problem that the negative pole can easily reach a cut-off voltage, and the charge capacity is reduced therefore. The lithium iron phosphate power battery is characterized by comprising a positive plate, a negative plate, and electrolyte. The lithium salt is lithium hexafluorophosphate (11.5-15.0%). The organic solvent is a four component mixed solvent, which is composed of propylene carbonate, methyl carbonate, ethyl carbonate, and diethyl carbonate according to a ratio of 10-40: 1-10: 20-50: 10-30. The additive is one or more of vinylene carbonate, fluoroethylene carbonate, propargyl sulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, and lithium tetrafluoro(oxalato)phosphate. The interface impedance of the negative pole can be reduced, the low temperature properties of the lithium iron phosphate power battery are obviously improved, and the low temperature charge performance of the lithium iron phosphate power battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium iron phosphate power batteries, and in particular relates to a lithium iron phosphate power battery capable of improving low-temperature charging performance. Background technique [0002] Lithium iron phosphate power battery has the advantages of high safety, long cycle life, environmental friendliness, non-toxic and harmless, and relatively low cost, so it has attracted widespread attention and has been widely used in electric vehicles. However, because the lithium intercalation potential of the graphite negative electrode is 0.1 volts, which is very close to zero volts, charging at low temperature, because the polarization increases, the negative electrode is easy to reach the cut-off voltage ahead of time, resulting in a decrease in charging capacity. In severe cases, the potential of the negative electrode is even lower than zero volts. Lithium dendrites are precipitated on the surface of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/62H01M4/66H01M4/136H01M4/133H01M10/0567H01M10/0568H01M10/0569
CPCH01M4/133H01M4/136H01M4/5825H01M4/583H01M4/622H01M4/623H01M4/625H01M4/661H01M4/667H01M10/0567H01M10/0568H01M10/0569H01M2220/20H01M2300/0025H01M2300/0042Y02E60/10
Inventor 胡学平刘道坦夏诗忠刘长来
Owner CAMEL GRP WUHAN OPTICS VALLEY R&D CENT CO LTD
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