Lithium-contained composite metal oxide material of lamina structure and use thereof

A composite metal, layered structure technology, applied in the field of materials, can solve problems such as layered compounds that have not yet been coated with carbon materials

Active Publication Date: 2007-06-13
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, so far, there have been no reports of layered compounds with surface-coated carbon materials.

Method used

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  • Lithium-contained composite metal oxide material of lamina structure and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 0.02mol Cr(NO 3 ) 3 9H 2 O, 0.1267mol CH 3 COOLi·2H 2 O and 0.0533mol Si(OC 2 h 5 ) 4 dissolved in appropriate amount of CH 3 CH 2 OH, slowly add NH 3 ·H 2 O, adjust the pH of the solution to 9.5-10.5, let it stand still to form a gel, place it in an oven at 100° C. for 10 hours to evaporate the solvent to dryness, and obtain a precursor. The precursor was mechanically ball milled for 4 hours, heated at 400°C for 10 hours under Ar gas, then mechanically ball milled for 4 hours after cooling down, and kept at 900°C for 10 hours to obtain Li[Cr 0.2 Li 0.267 Si 0.533 ]O 2 .

[0044] Will get Li[Cr 0.2 Li 0.267 Si 0.533 ]O 2 Mix with acetylene black and 10% polyvinylidene fluoride (PVDF) nitrogen methyl pyrrolidone solution at normal temperature and pressure to form a slurry (active material: acetylene black: PVDF = 90:5:5), and evenly coat it on the aluminum foil lining After drying in vacuum at 100°C for 5 hours, the resulting film was pressed under a p...

Embodiment 2

[0048] 0.01mol Cr 2 o 3 , 0.1267mol LiOH 2H 2 O and 0.0533mol SiO 2 The precursor was obtained by mixing mechanical ball milling for 4 hours, and then kept at 900 °C under Ar gas for 10 hours to obtain Li[Cr 0.2 Li 0.267 Si 0.533 ]O 2 . Electrodes and test cells were prepared in the same manner as in Example 1. Its electrochemical performance testing method is the same as that of Example 1, and the results are shown in Table 1.

Embodiment 3

[0050] With 0.04mol Cr(NO 3 ) 3 9H 2 O, 0.12mol CH 3 COOLi·2H 2 O and 0.04mol Si(OC 2 h 5 ) 4 For reactant, according to the same conditions of embodiment 1, Li[Cr 0.4 Li 0.2 Si 0.4 ]O 2 . Its electrochemical performance testing method is the same as that of Example 1, and the results are shown in Table 1.

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Abstract

Structural features of the composite metal oxide material are that oxygen atom layer, lithium atom layer, oxygen atom layer, metal layer and oxygen atom layer are arranged alternately in sequence in direction perpendicular to c axis in crystal structure. Characters of the composite material are that the composite material possesses laminated structure; more than two elements are existed in the metal layer, metals Cr,V,Nb,Mo,W are electrochemical active elements so as to change valence state in charging and discharging procedure; other elements are not electrochemical active elements, and no electron transfer and oxidation reduction reaction occurs; thus, M element is in favor of keeping structure stable. Advantages of the composite material are: high charging and discharging specific capacity, good cycle and magnification performances, low cost and no pollution, high energy density of lithium cell of using the composite material as active material for positive pole.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a layered lithium-containing composite metal oxide material and its application. Background technique [0002] At present, the positive electrode active materials of secondary lithium batteries mainly include LiCoO with layered structure. 2 , LiNiO 2 and LiNi x co 2-x mn x o 2 and LiMn with spinel structure 2 o 4 and LiFePO with olivine structure 4 Wait. Among them, LiMn with spinel structure 2 o 4 Capacity is 110mAh / g, suitable for high power batteries, LiFePO with olivine structure 4 The capacity is 150mAh / g, its density is low, the rate performance is poor, but the safety is better. These two types of materials are not suitable for application in high energy density secondary lithium batteries. [0003] Compounds with a layered structure are mainly used in high energy density secondary lithium batteries at present. where LiCoO 2 The actual specific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48C01D15/00C01G1/02H01M4/485
CPCY02E60/10
Inventor 米欣李泓黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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