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Manganese ion lithium silicate/carbon composite anode material for rechargeable lithium battery and method for preparing the same

A technology of lithium manganese iron silicate and positive electrode materials, which is applied in the direction of battery electrodes, silicon compounds, chemical instruments and methods, etc., can solve the problems of poor conductivity, achieve the effects of preventing sintering and agglomeration, good rate performance, and improved conductivity

Inactive Publication Date: 2008-11-26
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a manganese iron lithium silicate / carbon composite positive electrode material for rechargeable lithium batteries that can provide high specific capacity and high specific power under relatively large current conditions in view of the disadvantages of poor conductivity of silicate positive electrode materials and its preparation method

Method used

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  • Manganese ion lithium silicate/carbon composite anode material for rechargeable lithium battery and method for preparing the same
  • Manganese ion lithium silicate/carbon composite anode material for rechargeable lithium battery and method for preparing the same
  • Manganese ion lithium silicate/carbon composite anode material for rechargeable lithium battery and method for preparing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 10.2g LiAc·2H 2 O, 12.25g Mn(Ac) 2 4H 2 O and 10.42g Si(OC 2 h 5 ) 4 Add it to 100ml of ethanol, react in an oil bath at 80°C for 12h, transfer to an evaporating dish and dry at 120°C. Then the mixture obtained was transferred to an agate ball mill jar, 2g of sucrose was added, and 30ml of acetone was used as a dispersant, and ball milled for 5h (rotation speed 500r / min). After the acetone is volatilized, it is transferred to a porcelain boat and placed in a tube resistance furnace under N 2 Under protection, heat treatment at 650° C. for 10 h, and naturally cool to room temperature to obtain the composite material. In the total mass of this complex, Li 2 MnSiO 4 95% and C 5%. Composite material according to mass ratio: acetylene black: binder = 80:10:10, ball milled and mixed, coated on the treated aluminum foil, dried at 120°C, pressed and molded at 20MPa to obtain a positive electrode for a rechargeable lithium battery .

Embodiment 2

[0028] 5.1g LiAc·2H 2 O, 6.12g Mn(Ac) 2 4H 2 O and 5.21g Si(OC 2 h 5 ) 4 Add it to 60ml of ethanol, react in an oil bath at 60°C for 30h, transfer it to an evaporating dish and dry it at 100°C. Then the resulting mixture was transferred to an agate ball mill jar, 2.5 g of sucrose was added, and 20 ml of acetone was used as a dispersant for ball milling for 4 h (rotation speed 550 r / min). After the acetone is volatilized, it is transferred to a porcelain boat and placed in a tube resistance furnace under N 2 Under protection, heat treatment at 600° C. for 15 hours, and naturally cool to room temperature to obtain the composite material. In the total mass of this complex, Li 2 MnSiO 4 91% and C 9%. Composite material according to mass ratio: acetylene black: binder=80:10:10, ball milling and mixing, coating on the treated aluminum foil, drying at 120°C, pressing and molding at 20MPa to obtain the positive electrode for rechargeable lithium battery .

Embodiment 3

[0030] 10.2g LiAc·2H 2 O, 12.25g Mn(Ac) 2 4H 2 O and 10.42g Si(OC 2 h 5 ) 4 Add it to 150ml of ethanol, react for 12h in an oil bath at 80°C, transfer to an evaporating dish and dry at 120°C. The resulting mixture was then transferred to an agate ball mill jar, 8.6 g of sucrose was added, and 30 ml of acetone was used as a dispersant for ball milling for 5 h (rotation speed 500 r / min). After the acetone is volatilized, it is transferred to a porcelain boat and placed in a tube resistance furnace under N 2 Under protection, heat treatment at 550° C. for 20 h, and naturally cool to room temperature to obtain the composite material. In the total mass of this complex, Li 2 MnSi0 4 84% and C 16%. Composite material according to mass ratio: acetylene black: binder=80:10:10, ball milling and mixing, coating on the treated aluminum foil, drying at 120°C, pressing and molding at 20MPa to obtain the positive electrode for rechargeable lithium battery .

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Abstract

The preparation method for high specific capacity and specific power manganous ferrous lithium silicate with formula as Li2MSiO4(M=Mn(1-x)Fex, 0íœxíœ1) / C as anode material for lithium cell comprises: mixing the lithium salt, manganous salt, ferrite and normal silicate ester into water-alcohol system, heating to obtain the mixed predecessor; then, grinding with sugar to mix and treat at high-temperature in nitrogen. Wherein, there is 84~97% silicate and 3~16% carbon. This invention is simple and convenient to operate, and has high performance-price ratio.

Description

technical field [0001] The present invention relates to a kind of anode material of rechargeable lithium battery, especially relate to a kind of manganese ferrosilicate lithium / carbon (Li 2 MSiO 4 (M=Mn 1-x Fe x , 0≤x≤1) / C) composite cathode material and preparation method thereof. technical background [0002] After more than ten years of development, rechargeable lithium batteries (such as lithium-ion batteries) have been widely used in various portable electronic products, and are expected to become energy storage devices for electric vehicles and hybrid vehicles. The current commercial lithium-ion battery cathode materials are based on oxide cathode materials, especially layered LiCoO 2 Material-based. LiCoO 2 Cathode materials have disadvantages such as limited resources, high price, and unfriendly environment. However, almost all oxide cathode materials are strong oxidants in the charged state, and there are serious safety hazards in direct contact with the curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B33/20C01B31/00H01M4/505
CPCY02E60/12Y02E60/10
Inventor 杨勇李益孝龚正良
Owner XIAMEN UNIV
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