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Ferrolithium phosphate and its compound metal phosphide electrode material and producing method thereof

An electrode material, composite metal technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of complex and harsh preparation process conditions, and achieve the effects of simple process, prolonged time and low energy consumption

Inactive Publication Date: 2006-05-17
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 1632969A discloses doping with metal ions or carbon, with an average particle size of 5-8 μm and a tap density of 1.8-2.0 g / cm 3 1. High-density spherical lithium iron phosphate with a high volumetric specific capacity of 140-160mAh / g for the first discharge at room temperature, and its preparation process conditions are relatively complex and harsh
[0006] In addition, recently L.F.Nazar et al. reported in [J].Nature Materials, 2004, 3, 147-152 that the metal phosphide formed inside lithium iron phosphate can constitute a nano-conductive network, thereby significantly improving the performance of LiFePO. 4 electrical conductivity, but there are still few studies on this aspect

Method used

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  • Ferrolithium phosphate and its compound metal phosphide electrode material and producing method thereof
  • Ferrolithium phosphate and its compound metal phosphide electrode material and producing method thereof
  • Ferrolithium phosphate and its compound metal phosphide electrode material and producing method thereof

Examples

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Effect test

Embodiment 1

[0033] A spray heating device for preparing high-density spherical lithium iron phosphate such as figure 1 shown. 1-fluid pump, 2-injection valve, 3-needle valve, 4-high pressure nitrogen gas inlet, 5-nozzle, 6-high temperature chamber, 7-air inlet, 8-heater, 9-temperature sensor, 10-cyclone collector, 11-sample container, 12-exhaust fan, 13-exhaust port, 14-exit temperature sensor. One end of the sampling valve is provided with a fluid pump, the other end is provided with a high-pressure nitrogen gas inlet and is connected through a needle valve. The lower end of the sampling valve is provided with a nozzle, which extends into the high-temperature chamber. The cyclone collector is connected to the sample container; an exhaust fan and an exhaust port are arranged above the cyclone collector; an air inlet is arranged at the lower end of the heater, and a temperature sensor is arranged at the upper end. The main body of the high-temperature chamber is in an inclined state (abo...

Embodiment 2

[0035] Example 2: High-density spherical LiFePO 4 preparation of

[0036] At room temperature, 100 mL of 0.1 M Fe(NO 3 ) 3 9H 2 O solution with 100 mL of 0.1M LiH 2 PO 4 The solution is mixed evenly and prepared into a mixed solution with a total volume of 200mL; after the mixed solution is introduced into the spray heating device by the fluid pump at a flow rate of 15mL / min, it is sprayed out from a nozzle with a caliber of 0.5mm along with high-pressure nitrogen gas, and enters with a diameter of 6cm. The high-temperature chamber is 100cm long, and the flow rate of high-pressure nitrogen is controlled at 100L / h. The temperature in the high-temperature chamber is controlled by a heater and a temperature sensor. The temperature at the inlet is 350°C, and the temperature at the outlet at the bottom is 120°C; the droplets ejected from the nozzle are instantly atomized and nucleated under the action of high-speed heat flow nitrogen in the high-temperature chamber ; Subseque...

Embodiment 3

[0037] Example 3: High-density spherical LiFePO 4 / NiP preparation

[0038] At room temperature, prepare 100mL of 0.1M Fe(NO 3 ) 3 9H 2 O solution with 100 mL of 0.1M LiH 2 PO 4 solution and mix well, then add NiSO 4 ·6H 2 O(5mM), Na 3 C 6 h 5 o 7 2H2 O(6mM) and NaH 2 PO 2 ·H 2 O (5mM) mixed solution and mix well. After the mixed liquid is introduced into the spray heating device by the fluid pump at a flow rate of 15mL / min, it is sprayed out from a nozzle with a diameter of 0.5mm along with high-pressure nitrogen gas, and enters a high-temperature chamber with a diameter of 6cm and a length of about 100cm. The flow rate of high-pressure nitrogen gas is controlled at 100L / h; the temperature in the high temperature chamber is controlled by a heater and a temperature sensor, the temperature at the inlet is about 350°C, and the temperature at the outlet at the bottom is about 120°C; the liquid droplets ejected from the nozzle are under the action of nitrogen gas of...

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Abstract

An electrode material of Fe¿CLi phosphate and its composite metal phosphate is electrode material of LiFePO4 and LiFePO4 / MxP in high density spherical shape with diameter of 2micro m. The electrode material of LiFePO4 and LiFePO4 / MxP can be prepared by low ¿C temperature controllable one ¿C stage atomizing process in short flow.

Description

technical field [0001] The invention relates to a lithium ion battery material, in particular to an electrode material and a preparation method of lithium iron phosphate and its composite metal phosphide. It is high-density spherical LiFePO 4 and LiFePO 4 / M x P (M is any one of transition metal Ni, Fe, W, Mo or Co, X is 1 or 2) composite electrode material. LiFePO prepared by one-step spray method 4 and LiFePO 4 / M x The P electrode material has a regular spherical structure with a diameter of about 2 μm. It has high electrical conductivity and packing density, which greatly improves the diffusion performance of protons, increases the contact between the active material and the electrode, and reduces the electrode and battery capacity. Internal resistance, thereby significantly improving the discharge and cycle stability of the electrode. LiFePO 4 and LiFePO 4 / M x As the positive active material of lithium-ion batteries, P microspheres can effectively improve the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/00C01B25/45H01M4/58
CPCY02E60/10
Inventor 陈军张绍岩张莉马华
Owner NANKAI UNIV
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