honeycomb structure spherical LiFePO4 / C composite material preparation method

A composite material, honeycomb structure technology, applied in structural parts, chemical instruments and methods, electrode manufacturing, etc., can solve problems such as safety, problems, and restrictions on the application of lithium-ion batteries

Inactive Publication Date: 2009-06-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, lithium-ion battery cathode materials are mainly lithium cobalt oxide, which has safety problems, which limits the application of lithium-ion batteries in electric vehicles

Method used

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  • honeycomb structure spherical LiFePO4 / C composite material preparation method
  • honeycomb structure spherical LiFePO4 / C composite material preparation method
  • honeycomb structure spherical LiFePO4 / C composite material preparation method

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specific Embodiment approach 1

[0007] Specific implementation mode 1: In this implementation mode, the honeycomb structure spherical LiFePO 4 / C Composites by NH 4 FePO 4 ·H 2 O. Li 2 CO 3 and glucose, where NH 4 FePO 4 ·H 2 O and Li 2 CO 3 The molar ratio of C and LiFePO in glucose is 2:1 4 The mass ratio is 1:10~30; said NH 4 FePO 4 ·H 2 O is made from ferrous sulfate, phosphoric acid and ammonia water at a molar ratio of 1:1~1.5:1~1.2.

specific Embodiment approach 2

[0008] Embodiment 2: In this embodiment, the molar ratio of ferrous sulfate, phosphoric acid and ammonia water is 1:1-1.3:1-1.1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0009] Specific Embodiment Three: In this embodiment, the molar ratio of ferrous sulfate, phosphoric acid and ammonia water is 1:1.2:1.05. Others are the same as in the first embodiment.

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Abstract

The invention solves safety issue existed in anode material of lithium ion battery currently. The issue limits lithium ion battery to be applied to electric automobile. The disclosed product is prepared from NH4FePO4.H2O, Li2CO3 and glucose or cane sugar. Mol ratio between NH4FePO4.H2O and Li2CO3 is 2:1. Mass ratio between C in glucose or cane sugar and LiFePO4 is 1:10-30. NH4FePO4.H2O is prepared from ferrous sulfate, phosphoric acid and ammonia according to mol ratio. Using ultrasonic controlled crystallization process prepares precursor, and using solid state sintering at high temperature prepares composite material. Electrolyte with cellular structure (CS) in the invention can penetrate to inside spherical granules of lithium ferrous phosphate with CS so as to shorten path of solid phase diffusion for lithium ions and to be in favor of charge and discharge in large scaling factor. The anode material is suitable to electric automobile. The method is easy of operation.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a power lithium ion battery. Background technique [0002] As people's requirements for the quality of the living environment are getting higher and higher, the demand for electric vehicles is also becoming more and more urgent. Countries around the world are actively developing electric vehicle technology, among which high-power power batteries are one of the key technologies. Due to its unique properties such as high voltage, large capacity, small size, light weight, no memory effect, and long cycle life, lithium-ion batteries have broad application prospects and potential huge economic benefits in the electric vehicle market, and have become a research hotspot. At present, lithium cobalt oxide is the main anode material of lithium-ion batteries, which has safety problems, which limits the application of lithium-ion batteries in electric vehicles. Therefore, it is an u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/04B01J19/00C01B25/45
CPCY02E60/10
Inventor 王殿龙戴长松胡信国李冰
Owner HARBIN INST OF TECH
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