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Method for preparing transition metal oxide positive electrode material of lithium

A technology of transition metal and positive electrode material is applied in the field of preparing lithium transition metal oxide positive electrode material to achieve the effects of improving electrochemical performance, easy control of reaction conditions and simple operation

Active Publication Date: 2015-04-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although great progress has been made in high-performance cathode materials in recent years, there is still no method for synthesizing nanomaterials with special morphology and characteristic crystal planes, which is universal and easy to control the reaction conditions. Cathode materials for lithium-ion batteries

Method used

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  • Method for preparing transition metal oxide positive electrode material of lithium
  • Method for preparing transition metal oxide positive electrode material of lithium
  • Method for preparing transition metal oxide positive electrode material of lithium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Dissolve 0.45mmol3,4,9,10-perylenetetracarboxylic anhydride in 14mL of 0.128M NaOH solution, add 0.2mmol Ni(Ac) 2 2H 2 O and 0.7mmol Mn(Ac) 2 2H 2 O was dissolved in 25 mL of water. Slowly add the perylene anhydride solution dropwise into the nickel-manganese mixed solution under stirring condition, stir at room temperature for 0.5h, transfer the prepared mother liquor into a reaction kettle, and hydrothermally crystallize at 100°C for 24h;

[0045] (2) After centrifugation, washing, and drying, an orange-yellow precursor was obtained. Under the JSM-6360 scanning electron microscope, as attached figure 1 (a) The nickel-manganese-organic ligand polymer shown has a six-membered ring morphology, with each side width of about 700 nm and length of 2.5 μm. The precursor was calcined in an air atmosphere at 550° C. for 1 h to obtain nickel manganese oxide. as attached figure 1 As shown in (b), the nickel manganese oxide continues the six-membered ring morphology of t...

Embodiment 2

[0052] Using the preparation process of Example 1, the difference is that an excess of 15.0% Li(Ac) 2H is used 2 O was ball milled with nickel manganese oxide. X-ray diffraction spectra and transmission electron microscopy photos show that the prepared Li 1.07 Ni 0.5 mn 1.5 o 3.98 It has a spinel structure and has a nanosheet morphology of about 60nm*80nm. Using the same pole piece fabrication method as in Example 1, the material exhibits excellent cycle stability and rate performance. as attached Figure 5 As shown, when discharged at 10C, the specific capacity can reach 117mAh / g, and the capacity can still maintain 74% after 1000 cycles; when discharged at 40C, the capacity can still reach 98.0mAh / g after 500 cycles. in the attached Image 6 Among them, when charging and discharging at 1C at 55°C, the specific capacity can reach 131mAh / g, and the capacity retention rate after 350 cycles is 79.0%.

Embodiment 3

[0054] (1) Dissolve 0.45mmol phenolic resin in 14mL solution (ethylene glycol, water volume ratio is 1:1), and 0.18mmol Ni(Ac) 2 4H 2 O, 0.10mmol Co(NO 3 ) 2 ·6H 2 O and 0.70 mmol Mn(Ac) 2 4H 2 O was dissolved in 30 mL of water;

[0055] (2) Slowly add the solution of phenolic resin dropwise to the nickel-manganese mixed solution under stirring; transfer the prepared mother liquor into the reaction kettle, and crystallize it by solvent heat at 80°C for 72h;

[0056] (3) After centrifugation, washing, and drying, the precursor was roasted in an air atmosphere at 400°C for 6 hours to obtain metal oxides;

[0057] (4) With LiNi 0.5 mn 1.5 o 4 For the target product, the metal oxide was mixed with an excess of 10% lithium source (LiAc·2H 2 O, LiNO 3 The molar ratio is 1:3) dispersed in acetone, the ball-to-material ratio is 15:1, and ball milled for 2 hours;

[0058](5) The ball-milled mixture was calcined at 700 °C for 24 h, and the heating rate was 5 °C / min to obtain...

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Abstract

The invention relates to a method for preparing a transition metal oxide positive electrode material of lithium. The method is a metal-organic coordination polymer precursor method, and the transition metal oxide of lithium can be prepared by performing thermal treatment and high-temperature calcination to the metal-organic coordination polymer. The transition metal oxide of the lithium prepared by using the method is good in crystal form, has nanoscale, special morphology and specific crystal orientation, and can show excellent electrochemical performance when being used as a positive electrode material of a lithium ion battery. The LiNi0.5Mn1.5O4 synthesized by using a method and having a spinel structure can achieve the specific capacity up to 117mAh / g when being used for discharging at 10 DEG C and 40 DEG C, and the specific capacity can be kept above 81.0% after being cyclized for 500 times. The specific capacity can achieve 105mAh / g after charging and discharging are carried out for 350 times according to 1C rate at 55 DEG C. In addition, the lithium-rich manganese-based positive electrode material 0.3Li2MnO3.0.7LiNi0.5Mn0.5O2 prepared by utilizing the method and having a laminar structure has reversible specific capacity. Two classes of materials are used as the positive electrode materials of the lithium ion battery with high specific energy and high specific power, and the method has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of preparation of energy materials and lithium ion batteries, and in particular relates to a method for preparing lithium transition metal oxide cathode materials. Background technique [0002] In recent years, with the increasing energy and environmental issues and the requirement of lightweight electronic products, as the secondary battery with the highest energy density and power density, lithium-ion battery has become the preferred technology to solve contemporary environmental and energy problems. In recent years, lithium-ion batteries have made great progress in the field of high-energy batteries, but there is still a gap in the application of electric vehicles (EV), hybrid electric vehicles (HEV) and other fields. The key issue is to research and develop new high-energy density electrodes. Material. [0003] The electrode materials of lithium-ion batteries, especially the cathode materials, are one o...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/362H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈剑杨时峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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