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Preparation method of cathode material Li2Mn1-x-yCoxNiySiO4 for lithium ion battery

A cathode material, lithium ion technology, applied in the field of new energy materials, can solve the problem of low electrical conductivity of materials, and achieve the effect of increasing capacity

Inactive Publication Date: 2013-03-27
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since Li 2 MSiO 4 The electrical conductivity of the series material is relatively low, so the electrochemical performance can be improved by modification

Method used

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  • Preparation method of cathode material Li2Mn1-x-yCoxNiySiO4 for lithium ion battery
  • Preparation method of cathode material Li2Mn1-x-yCoxNiySiO4 for lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Li 2 mn 0.2 co 0.3 Ni 0.5 SiO 4 Lithium acetate, manganese acetate, cobalt acetate, nickel acetate and tetraethylorthosilicate were mixed in 45 mL of absolute ethanol according to the molar ratio of 0.02 mol: 0.002 mol: 0.003 mol: 0.005 mol: 0.01 mol, so that Li: Mn : Co: Ni: The molar ratio of Si is 2: 0.2: 0.3: 0.5: 1, then add 0.01 mol of catalyst glacial acetic acid, and magnetically stir to make the solution evenly mixed. (2) Transfer the uniformly mixed raw materials into a 100 mL polytetrafluoroethylene tank, and react in a constant temperature oven at 80 °C for 30 h to obtain a wet gel, and dry the gel-like material in a blast drying oven at 60 °C After drying, a xerogel is obtained. (3) The obtained xerogel was ground into powder in an agate mortar, ball milled with acetone as dispersant for 6 h, and the acetone was evaporated to dryness to obtain the reaction precursor. The precursor was compressed at 6 MPa and calcined at 600 °C for 10 h in a nitrog...

Embodiment 2

[0028] (1) Li 2 mn 0.2 co 0.4 Ni 0.4 SiO 4Lithium acetate, manganese acetate, cobalt acetate, nickel acetate and tetraethylorthosilicate were mixed in 45 mL of absolute ethanol at a molar ratio of 0.02 mol: 0.002 mol: 0.004 mol: 0.004 mol: 0.01 mol, so that Li: Mn : Co: Ni: The molar ratio of Si is 2: 0.2: 0.4: 0.4: 1, then add 0.01 mol of catalyst glacial acetic acid, and magnetically stir to make the solution evenly mixed. (2) Transfer the uniformly mixed raw materials into a 100 mL polytetrafluoroethylene tank, react in a constant temperature oven at 100 °C for 20 h, and obtain a wet gel, and dry the gel-like material in a blast drying oven at 60 °C After drying, a xerogel is obtained. (3) The obtained xerogel was ground into powder in an agate mortar, ball milled with acetone as dispersant for 6 h, and the acetone was evaporated to dryness to obtain the reaction precursor. The precursor was compressed at 6 MPa and calcined at 600 °C for 15 h in a nitrogen atmosphere ...

Embodiment 3

[0030] (1) Li 2 mn 1 / 3 co 1 / 3 Ni 1 / 3 SiO 4 Lithium acetate, manganese acetate, cobalt acetate, nickel acetate and tetraethylorthosilicate were mixed in 45 mL of absolute ethanol at a molar ratio of 0.02 mol: 0.0033 mol: 0.0033 mol: 0.0033 mol: 0.01 mol, so that Li: Mn : Co: Ni: The molar ratio of Si is 2: 0.33: 0.33: 0.33: 1, then add 0.02 mol of catalyst glacial acetic acid, and magnetically stir to make the solution evenly mixed. (2) Transfer the uniformly mixed raw materials into a 100 mL polytetrafluoroethylene tank, react in a constant temperature oven at 100 °C for 25 h to obtain a wet gel, and dry the gel-like material in a blast drying oven at 60 °C After drying, a xerogel is obtained. (3) The obtained xerogel was ground into powder in an agate mortar, ball milled with acetone as dispersant for 6 h, and the acetone was evaporated to dryness to obtain the reaction precursor. The precursor was compressed at 8 MPa and calcined at 700 °C for 10 h in a nitrogen atmosp...

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Abstract

The invention relates to a preparation method of a cathode material Li2Mn1-x-yCoxNiySiO4 for a lithium ion battery. The method comprises the steps of mixing a lithium salt, a manganese salt, a cobalt salt, a nickel salt and tetraethyl orthosilicate in a homogeneous medium; adding a catalyst; stirring; transferring the mixture into a polytetrafluoroethylene jar; reacting to obtain a wet gel; drying the wet gel to obtain a xerogel; grinding the xerogel to obtain a reaction precursor; and calcining the reaction precursor to obtain the cathode material Li2Mn1-x-yCoxNiySiO4 for the lithium ion battery. The method has the advantages of simple preparation process, low cost, good dispersibility of the obtained material, etc. The cathode material Li2Mn1-x-yCoxNiySiO4 for the lithium ion battery becomes a novel generation cathode material for the lithium-ion battery having great developmental potential, because the material has the advantages of high theoretical capacity, outstanding safety performance, stable crystal framework structure, flexible and controllable charging and discharging voltage platform, and the like. At the same time, Co<2+> can stabilize a layered structure; Ni<2+> can increase the capacity of the material; and Mn<2+> can not only reduce the cost of the material but also improve security and stability.

Description

technical field [0001] The present invention relates to a kind of preparation method of lithium ion battery cathode material, particularly relate to a kind of lithium ion battery cathode material Li 2 mn 1-x-y co x Ni y SiO 4 The preparation method belongs to the field of new energy materials. Background technique [0002] With the development of society, lithium-ion batteries have attracted much attention. As a high specific energy chemical power source, lithium-ion secondary batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields, and have rapidly developed into one of the most important secondary batteries at present. At present, the commercial lithium-ion battery cathode material is mainly LiCoO 2 , while Co resources in nature are relatively scarce and scarce, and the price is relatively high, and Co element is toxic and has certain hazards to the environment. It does not meet the ...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 吴晓燕张春明王丹张遥遥汪元元何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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