Transition metal oxide positive electrode material of lithium as well as preparation and application of transition metal oxide positive electrode material

A transition metal and cathode material technology, applied in the field of energy storage, can solve the problems of unsatisfactory high-rate cycle stability and high-temperature stability, difficulty in large-scale production, long synthesis cycle, etc., and achieve excellent cycle stability and high-temperature stability The effect of stability, easy large-scale production, and control of reaction conditions

Inactive Publication Date: 2015-03-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported methods for synthesizing this type of compound generally have a long synthesis cycle, high synthesis difficulty, and high cost, making it difficult to achieve large-scale production; and the current cycle stability of this type of material, especially the large-rate cycle stability of the material and high temperature stability is not yet ideal

Method used

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  • Transition metal oxide positive electrode material of lithium as well as preparation and application of transition metal oxide positive electrode material
  • Transition metal oxide positive electrode material of lithium as well as preparation and application of transition metal oxide positive electrode material
  • Transition metal oxide positive electrode material of lithium as well as preparation and application of transition metal oxide positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Add 0.5mmol Ni(Ac) 2 2H 2 O, 1.5mmol Mn(Ac) 2 2H 2 O mixing and ball milling for 8 hours;

[0043] (2) Heat treatment under natural ventilation: 1000°C for 1h, mix the obtained oxide with an excess of 10% LiAc·2H 2 O mixing and ball milling for 8 hours;

[0044] (3) Calcining the ball-milled mixture at 850°C for 12 hours in a tube furnace;

[0045] (4) Then flow the air at a flow rate of 10mL / min for 8 hours, and finally produce 0.97Li 1.02 Ni 0.5 mn 1.5 o 3.98 0.02Li 2 CO 3 ·0.01LiOH, the mass ratio of each component is measured by chemical titration and inductively coupled plasma emission spectrometry.

[0046] (5) Phase analysis: X-ray diffraction analysis was performed on the prepared material, as shown in the attached figure 1 The resulting material shown has a spinel structure belonging to the Fd-3m crystal form. The material has a high degree of crystallinity and only a few impurity Li x Ni 1-x O(0≦x≦0.5).

[0047] (6) Morphological characteri...

Embodiment 2

[0051] (1) Add 1.2mmol Cr 2 o 3 , 0.1mmol RuO 2 and 1.5 mmol MnC 2 o 4 2H 2 O mixing and ball milling for 12 hours;

[0052](2) Heat treatment: 400°C for 5h, the obtained oxide and an excess of 8.0% Li 2 C 2 o 4 2H 2 O mixing and ball milling for 8 hours;

[0053] (3) Calcining the ball-milled mixture at 900°C for 24 hours in a tube furnace;

[0054] (4) Then flow CO 2 , the flow rate is 80mL / min, the time is 1h, and finally 0.99Li 1.00 Cr 1.2 Ru 0.05 mn 0.75 o 3.98 0.01 Li 2 CO 3 .

[0055] (5) Phase analysis and morphology characterization: X-ray diffraction spectrum shows that the obtained material has a spinel structure and belongs to the Fd-3m crystal form, and the crystal structure of the material is not affected by the doping of Cr and Ru. The material has high crystallinity and no impurity Li x Ni 1-x O(0≦x≦0.5) exists. The microscopic morphology of the material was investigated on a Hitachi transmission electron microscope HT7700. The particle si...

Embodiment 3

[0059] (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 vigorous stirring, and stir at room temperature for 0.5 h; transfer the prepared mother liquor into a reaction kettle, and hydrothermally crystallize at 100°C for 24 h;

[0060] (2) After centrifugation, washing, and drying, an orange-yellow precursor was obtained. The precursor was calcined at 600°C in an air atmosphere with a flow rate of 60mL / min for 1h to obtain nickel-manganese oxide.

[0061] (3) Mix nickel manganese oxide with an excess of 20% lithium source (Li 2 CO 3 :LiAc·2H 2 O=1:3) dispersed in acetone, ball milled for 12h;

[0062] (4) The ball-milled mixture was calcined at 850°C for 12 hours at a high temperature with a heating rate of 5°C / min;

[0063] (5) Then flow ...

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Abstract

The invention relates to a transition metal oxide positive electrode material of lithium as well as a preparation method of the transition metal oxide positive electrode material. The transition metal oxide of the lithium is composite oxide with a layer of amorphous material covering the surface of a bulk phase material, the chemical constitution of the transition metal oxide is (1-w1-w2)Li<1+x>NiyMzMn<2-y-z>O<4-delta>.w1Li2CO3.w2LiOH, wherein Li<1+x>NiyMzMn<2-y-z>O<4-delta> is the bulk phase material, the bulk phase material has a spinel structure, and Li2CO3 and LiOH are respectively amorphous surface layer substances. The positive electrode material has a lithium intercalation and deintercalation electrode potential being more than or equal to 4.0V(vs.Li/Li<1+> and a theoretical mass specific capacity being more than 120mAh/g; the material is excellent in cycling stability and high-temperature stability.

Description

technical field [0001] The invention belongs to the field of energy storage, and relates to a secondary battery, in particular to a lithium transition metal oxide cathode material and a preparation method thereof. Background technique [0002] Since its commercialization in 1990, lithium-ion batteries have been widely used in portable electronic devices such as notebook computers, mobile phones, and digital cameras. In recent years, with the increasing energy and environmental issues and the requirements for lightweight electronic products, lithium-ion batteries, as secondary batteries with the highest energy density and power density, are gradually used in electric vehicles, aerospace, satellites and other fields . With people's emphasis on environmental protection, the development of new lithium-ion battery systems to replace traditional fossil fuels as the power source of electric vehicles has become one of the mainstream directions for the development of the current bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01G11/50H01G11/46
CPCH01G11/46H01G11/50H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈剑杨时峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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