Method for synthesizing nanometer LiFePO4 lithium ion power battery cathode material by ferric iron source

A trivalent iron source and power battery technology, applied in the direction of battery electrodes, electrode manufacturing, chemical instruments and methods, etc., can solve the problems of poor product form, poor electrochemical performance, small production batches, etc., and achieve low manufacturing costs , Synthetic reaction time is shortened, and the effect of improving electronic conductivity

Inactive Publication Date: 2009-10-28
NANJING ZHONGDA QINGSHAN ELECTRIC VEHICLE
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  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the products produced by the lithium iron phosphate synthesis process have poor

Method used

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  • Method for synthesizing nanometer LiFePO4 lithium ion power battery cathode material by ferric iron source
  • Method for synthesizing nanometer LiFePO4 lithium ion power battery cathode material by ferric iron source
  • Method for synthesizing nanometer LiFePO4 lithium ion power battery cathode material by ferric iron source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, dissolve 0.1 mol lithium nitrate, 0.1 mol iron nitrate, and 0.1 mol ammonium dihydrogen phosphate (the required weight can be calculated by the number of moles × molecular weight) in deionized water, then add 60 g of glycine, heat and stir until a gel is formed . Then put the gel into an oven at 250°C to let it ignite spontaneously to obtain the precursor. Then the precursor was mixed with sucrose ball mill for 30 minutes, and finally the mixture was roasted at 800°C for 10 hours at a rate of 10°C / min in a nitrogen atmosphere to obtain the required LiFePO 4 / C material.

[0028] The prepared sample, conductive agent (SuperP), and binder (PVDF) were uniformly mixed in a mass ratio of 85:8:7, and coated on an aluminum foil with a thickness of 10 μm. After punching, the electrode sheets were dried in a vacuum oven at 100°C for 12 hours. The pure metal lithium sheet is used as the counter electrode, and the electrolyte is 1mol / L LiPF 6 , assembled into a mock bat...

Embodiment 2

[0032] Mix the precursor and sucrose in Example 1 by ball milling for 2 hours, then heat up to 700°C for 20 hours in an argon atmosphere at a rate of 5°C / min to obtain the required LiFePO 4 / C material. The preparation of the simulated battery is consistent with the method in Example 1. Investigate the cycle performance of charging and discharging electrodes on a high-precision battery tester.

[0033] Such as image 3 Shown: Synthetic product LiFePO 4 The / C cathode material is assembled with Li to form a simulated battery. The specific capacity of the first discharge at 0.1C can reach 140mAh / g. The charging and discharging platform is flat and has good lithium intercalation performance.

[0034] Such as Figure 4 Shown: Synthetic product LiFePO 4 The / C cathode material is assembled with Li to simulate a battery with considerable capacity when it is charged and discharged stably at a high current. 5C stable charge and discharge reversible capacity reaches 94mAh / g; 10C ...

Embodiment 3 Embodiment 6

[0039]

[0040] The corresponding LiFePO can be obtained by referring to the method of Example 1 according to the above experimental parameters. 4 / C cathode active material.

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Abstract

The invention relates to a method for synthesizing a nanometer LiFePO4 lithium ion power battery cathode material by a ferric iron source. The method comprises the steps of: taking lithium source, ferric iron source and phosphorus source compounds as raw materials, performing material mixing according to the stoichiometric proportion of the materials, then adding a certain amount of combustion improver, and dissolving the mixture into water to form a solution or an emulsion with even dispersion; and carrying out spontaneous combustion on the solution or the emulsion to obtain a precursor of the cathode material, and then roasting the prepared precursor under inert atmosphere in a furnace to obtain the cathode material. The method adopts cheap ferric iron source as the raw material, has simple process and reduced cost, also has even particle size and element distribution, can prepare nanometer-grade particles, obviously reduce energy consumption, meet environmental requirement, is suitable for mass production, and greatly accelerates the industrialization process of the cathode material.

Description

technical field [0001] The invention relates to a method for synthesizing nanoscale LiFePO by cheap trivalent iron source 4 The invention relates to a method for a positive electrode material of a lithium-ion power battery, belonging to the technical field of lithium-ion battery materials. Background technique [0002] Lithium-ion batteries are the latest generation of secondary batteries developed in the 1990s. The research and development of new lithium-ion power batteries is not only an urgent need for people at present, but also has very important practical significance for solving the global energy shortage problem. In 1997, Goodenough first pointed out that LiFePO with olivine structure 4 It can reversibly intercalate and deintercalate lithium ions. Considering its non-toxicity, environmental friendliness, rich source of raw materials, high specific capacity and good cycle performance, LiFePO 4 It is considered to be the most potential cathode material for lithium-i...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 邵宗平于星蔡锐冉然
Owner NANJING ZHONGDA QINGSHAN ELECTRIC VEHICLE
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