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Phosphate and lithium titanate composite anode material for lithium ion battery and method for producing the same

A composite cathode material, lithium ion battery technology, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc. Density reduction and other problems, to ensure the diffusion performance of conductive carriers, fully conductive microstructure channels, and improve the effect of electrochemical properties

Inactive Publication Date: 2009-04-08
龚思源
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The ionic conductivity of lithium iron phosphate is also relatively low. The commonly used method is nanometerization, shortening the diffusion path of lithium ions in the material, which can reduce the total resistance of lithium ions in the material, but the tap density of nanometer lithium iron phosphate is very low. The volumetric energy density of the battery will decrease, and the electrochemical and chemical stability of the material will also be reduced.

Method used

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  • Phosphate and lithium titanate composite anode material for lithium ion battery and method for producing the same
  • Phosphate and lithium titanate composite anode material for lithium ion battery and method for producing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A lithium ion battery composite lithium iron phosphate 95% LiFePO 4 -5% Li 4 Ti 5 o 12 The preparation method of the positive electrode material is to uniformly mix ferrous oxide, lithium oxide, and phosphorus pentoxide, and the molar ratio of phosphorus, iron, and lithium is determined according to the chemical formula, with 5% H 2 In the nitrogen atmosphere, the temperature was raised to 650°C within 5 hours, the reaction was kept for 8 hours, and then cooled to room temperature to obtain a composite material;

[0027] Lubricant graphite is added to the positive electrode composite material. The amount of the lubricant added is 5% of the weight of the composite material. After sufficient ball milling, the output is the positive electrode composite material. 0.2C / 0.2C rate capacity is greater than 155mAh g -1 , 1C / 1C rate charge and discharge specific capacity is 142mAh g -1 , the battery capacity does not decay after more than 500 cycles, and the efficiency is cl...

Embodiment 2

[0029] A lithium ion battery composite lithium iron phosphate 95% LiFePO 4 -5% Li 3 Ti 5 o 12 The preparation method of the positive electrode material is to uniformly mix iron hydroxide, lithium carbonate, titanium dioxide, and ammonium dihydrogen phosphate, determine the molar ratio according to the chemical formula, and use 5% H 2 In the nitrogen atmosphere, the temperature was raised to 500°C within 3 hours, the heat preservation reaction was carried out for 10 hours, and then cooled to room temperature to obtain a composite material;

[0030] Lubricant graphite is added to the positive electrode composite material. The amount of the lubricant added is 3% of the weight of the composite material. After sufficient ball milling, the output is the positive electrode composite material. 1C rate charge and discharge specific capacity is 138mAh g -1 , The battery capacity does not decay after more than 100 cycles.

Embodiment 3

[0032] A Lithium-Ion Battery Composite Lithium Iron Phosphate 90% LiFePO 4 -10% Li 2 Ti 5 o 12 The preparation method of the positive electrode material is to uniformly mix iron hydroxide, lithium carbonate, manganese dioxide, titanium dioxide, and ammonium dihydrogen phosphate, determine the molar ratio according to the chemical formula, and use 5% H 2 In the argon gas, the temperature was raised to 850 ° C within 10 hours, the reaction was kept for 4 hours, and then cooled to room temperature to obtain a composite material

[0033] Lubricant molybdenum disulfide is added to the positive electrode composite material, and the amount of lubricant added is 1% of the weight of the positive electrode composite material. After sufficient ball milling, the discharge is phosphate composite positive electrode material. 1C rate charge and discharge specific capacity is 142mAh g -1 , The battery capacity does not decay after more than 100 cycles.

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Abstract

The invention discloses a compound positive material of lithium ion battery phosphate and lithium titanate as well as a preparation method thereof; the material containing metal, lithium and phosphorous source or / and superfine LiMPO4 or / and superfine Li4-yTi5O12-sigma react to synthesize the compound material of LiMPO4 and Li4-yTi5O12-sigma having chemical bond and strong physical bond at the temperature under inert gas or reducing atmosphere; the compound positive material with excellent electrochemistry performance is obtained by adding lubricant ball mill. The compound positive material prepared by the method has cheap materials, low cost, unique technique, excellent electrochemistry performance of the production material and easy realization on industrialization.

Description

technical field [0001] The invention relates to a phosphate and lithium titanate composite cathode material for a lithium ion battery and a preparation method thereof, in particular to a composite material made of LiMPO 4 and Li 4-y Ti 5 o 12-δ Composition, by adjusting the preparation process controllable synthesis of composite microstructures with chemical bonds or strong physical bonds. Background technique [0002] Lithium-ion batteries are becoming increasingly important as energy storage devices in the activities of human society, LiFePO 4 It is considered to be the most promising anode material for lithium-ion batteries due to its low cost and safety. At present, the research on lithium iron phosphate mainly focuses on the following aspects: (1) Reducing the particle size of the synthetic material and shortening the diffusion path of lithium ions in the material can increase the diffusion rate of lithium ions in the material, but it will reduce the (2) Adding a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04B01J19/00B22F9/00
CPCY02E60/12Y02E60/10
Inventor 黄富强龚思源刘红仙
Owner 龚思源
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