Lithium iron phosphate battery

A lithium iron phosphate battery and lithium salt technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem that the electrolyte is difficult to meet low-temperature performance requirements

Pending Publication Date: 2021-12-31
BASF BATTERY MATERIALS SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the electrolyte in the existing lithium iron phosphate battery is difficult to meet the low-temperature performance requirements, the present invention provides a lithium iron phosphate battery

Method used

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Examples

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Embodiment 1

[0059] This embodiment is used to illustrate the lithium iron phosphate battery disclosed in the present invention and its preparation method, including the following steps:

[0060] 1) Preparation of non-aqueous electrolyte: Ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mixed according to the mass ratio of EC:EMC:DEC=1:1:1, Lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1 mol / L, and based on the total weight of the non-aqueous electrolyte being 100%, add additives containing the mass percent content shown in Example 1 of Table 1.

[0061] 2) Preparation of the positive plate: mix the positive active material LFP (LiFePO 4 ), conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then the mixture was dispersed in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The positive electrode slurry is evenly coated on both sides of the aluminum foil, after drying, calendering and vacu...

Embodiment 2～7

[0067] Embodiments 2 to 7 are used to illustrate the non-aqueous electrolyte, lithium ion battery and preparation method thereof disclosed in the present invention, including most of the operating steps in Embodiment 1, the difference being:

[0068] The non-aqueous electrolytic solution is added with the additives shown in the mass percentages of Examples 2 to 7 in Table 1.

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Abstract

In order to solve the problem that an electrolyte in the existing lithium iron phosphate battery is difficult to meet the low-temperature performance requirement, the invention provides a lithium iron phosphate battery which comprises a positive electrode, a negative electrode and the electrolyte, wherein the positive electrode comprises a positive electrode active material, and the positive electrode active material is selected from lithium iron phosphate; the electrolyte comprises a solvent, a lithium salt and an additive A, the additive A comprises anions and cations shown in a structural formula 1 in the description, R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from hydrogen, cyano, nitroso, aldehyde, acyl, halogen, substituted or unsubstituted alkyl with the carbon atom number of 1-8 and substituted or unsubstituted aryl with the carbon atom number of 6-12, and the anions are acid radical ions containing phosphorus, boron or aluminum. The lithium iron phosphate battery provided by the invention has relatively low impedance and relatively good low-temperature performance.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a lithium iron phosphate battery. Background technique [0002] At present, lithium-ion batteries have been widely used in electronic products such as mobile phones, notebook computers, and digital cameras. They are also used as power batteries in electric bicycles, model airplanes, and electric vehicles, especially in the military and aerospace fields. Lithium-ion batteries are required Ion batteries can have high and low temperature and high rate discharge performance at the same time. Among them, lithium iron phosphate batteries are considered to be a development direction of power batteries due to their advantages of high energy density, long cycle life, good safety performance, low self-discharge rate, and no memory effect. However, as the application range of lithium-ion batteries becomes wider and wider, the problem of poor adaptability to the appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 吴梅梅谭光平金丽华
Owner BASF BATTERY MATERIALS SUZHOU
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