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Olivine carbon bobbles composite material and use thereof

A composite material, olivine technology, applied in the direction of peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, inorganic chemistry, non-metallic elements, etc., can solve the properties of difficult dispersion and interfacial ion transport Poor, the secondary lithium battery can not always maintain electronic contact and other problems, to achieve the effect of high power density, high safety, increased rate and safety performance

Active Publication Date: 2007-01-03
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is in order to overcome existing olivine structure LiMPO 4 When such materials are used as positive electrode materials for secondary lithium batteries, they cannot always maintain good electronic contact and have poor interfacial ion transport properties; at the same time, they are not easy to disperse when directly adding conductive carbon nanotubes or nanofibers to positive electrode materials, thus providing A kind of olivine carbon pompom composite material with good ion transport properties and carbon nanotubes or nanofibers not easy to agglomerate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, pure phase lithium iron phosphate carbon pompom composite material 1

[0044] Pure phase LiFePO 4 It can be prepared by a two-step solid-phase synthesis method by the following steps. First, weigh LiF, FeC according to the molar ratio 2 o 4 2H 2 O and NH 4 h 2 PO 4 (molar ratio is 1:1:1), after mechanical mixing (ball milling, rotating speed is 500 rev / min, 3 hours), this mixture is in high-purity Ar gas / H 2 Gas mixture (H 2 Gas volume ratio accounts for 8%) heat treatment under protection (the step of heat treatment is: take 1 hour to be warmed up to 400 ℃ from room temperature, after 4 hours at 400 ℃ constant temperature, drop to room temperature with two hours), again ball milling (rotating speed is 500 rev / minutes, 1 hour), the mixture was sintered again (the sintering step is: take 2 hours to raise the temperature from room temperature to 600 ° C, keep the temperature at 600 ° C for 8 hours, and use 3 hours to drop to room temperature. The pu...

Embodiment 2

[0049] Embodiment 2, doped lithium iron phosphate carbon pompom composite material 2

[0050] Doped lithium iron phosphate Li 0.99 Na 0.01 FePO 4 It can be prepared by the following steps (refer to Chinese patent 200410031151.x). First, weigh Li according to the molar ratio 2 CO 3 、Na 2 CO 3 , FeC 2 o 4 2H 2 O and NH 4 h 2 PO 4 , after mechanical ball milling (rotating speed is 500 rev / min, 3 hours), this mixture is in Ar-H 2 Mixed gas (Ar:H 2 =92:8, v / v) heat treatment under protection (the steps of heat treatment are: take 1 hour to heat up from room temperature to 500 ° C, after keeping the temperature at 500 ° C for 8 hours, use two hours to drop to room temperature), ball milling again (rotating speed is 500 rpm, 1 hour), the mixture is sintered again (the sintering step is: take 2 hours to raise the temperature from room temperature to 700 ° C, keep the temperature at 700 ° C for 24 hours, and use 3 hours to drop to room temperature). Obtained doped lithiu...

Embodiment 3

[0054] The electrochemical test steps of the simulated battery: first charge at 30mA / g to 4.2V, and then discharge at a rate current to 2.0V, the released capacity is calculated as 130mAh / g based on the mass of doped lithium iron phosphate carbon pompom composite material 2, when When the discharge current increases to 1500mA / g, the discharge capacity of the material is 110mAh / g. This current density is equivalent to the charge and discharge rate of 10C. When the current density is further increased to 6000mA / g, the discharge capacity of the material is 80mAh. / g. This result indicates that the doped lithium iron phosphate carbon pompom composite 2 has better high-rate discharge characteristics. Embodiment 3, doped lithium iron phosphate carbon pompom composite material 3

[0055] Doped lithium iron phosphate LiFe 0.99 Na 0.01 PO 4 It can be prepared by the following steps (refer to Chinese patent 200410031151.x). First, weigh Li according to the molar ratio 2 CO 3 、Na ...

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Abstract

The present invention relates to a olivine carbon wool ball composite material. It one olivine basal body and wheresoever grown carbon nanotube or / and nano fiber, wherein the particle average diameter of said olivine basal body being 50 nm-50 micrometer, chemical constitution: LixAaMmBbPOzNn, said carbon nanotube or nano fiber diameter being 1-200 nm, length being 50 nm-100 um. Said composite material also includes olivine basal body surface covered single-layer carbon with thickeness 2-100 nm, carbon content being 1-20 wt per cent of basal body weight. Said composite material can directly be used as positive electrode active material in secondary lithium battery, also used as additive mixing use with existing positive electrode material. Said composite material can raise current positive electrode material and battery multiplying factor and safety feature. Secondary lithium battery Containing said olivine carbon wool composite material has large power density and high security etc advantages.

Description

technical field [0001] The invention relates to a positive electrode material for a secondary lithium battery, in particular to an olivine-carbon pompom composite material composed of an olivine-structured matrix material, carbon nanotubes and nanofibers, and its use in secondary lithium batteries. The use of positive electrode materials for lithium batteries. Background technique [0002] Transition metal lithium phosphate (LiMPO) with olivine structure 4 , M=Fe, Co, Mn, Ni) is a positive electrode active material mainly used in secondary lithium batteries. It has the advantages of low raw material price, abundant storage, no pollution to the environment, stable chemical properties, very good safety performance when used in secondary lithium batteries, high lithium storage capacity, and high voltage. At present, the best performance in this series of materials is lithium iron phosphate (LiFePO 4 ). Later, LiMPO with iron doping and phosphorus substitution was developed....

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48C01B15/00C01G1/02
CPCY02E60/10
Inventor 李泓黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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