C/Li2MSiO4-xNy/C (M=Fe, Mn, Co) composite positive electrode material for lithium ion battery and preparation method thereof

An ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of difficult two lithium ion deintercalation, low electron conductivity lithium ion diffusion rate, poor specific capacity performance and rate performance And other issues

Inactive Publication Date: 2012-01-11
JIANGSU ZHENGTONG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at present, the second lithium-ion deintercalation voltage platform of the silicate cathode material is relatively high, all of which are greater than 4.5V. It is difficult to implement the deintercalation of two lithium ions under the existing commercial electrolyte conditions.
And limited by the three-dimensional structure, its intrinsic electronic conductivity and lithium ion diffusion rate are low, and its specific capacity performance and rate performance are not good.

Method used

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  • C/Li2MSiO4-xNy/C (M=Fe, Mn, Co) composite positive electrode material for lithium ion battery and preparation method thereof
  • C/Li2MSiO4-xNy/C (M=Fe, Mn, Co) composite positive electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 2.0 grams of conductive activated carbon XC-72 was acid-treated for 24 hours, then washed with a solvent until neutral, dried at 120°C, ground and dispersed in 100ml of absolute ethanol. 20.4 g of LiAc· 2 h 2 O, 24.6 g FeAc 2 4H 2 O, 20.8 g Si(OC 2 h 5 ) 4 and 7.7 g CH 3 COONH 4 Dissolve in 200ml of absolute ethanol, and stir magnetically at room temperature for 24h. Then the dispersed porous carbon after the acid treatment was miscible with the metal ion solution, stirred at room temperature for 1-24 hours, then slowly raised to 100°C, and adjusted to a pH value of 13, magnetically stirred for 24 hours, and finally added 2 grams of glucose and stirred 1-24h, vacuum dried at 110°C. Transfer it to a porcelain boat in a tube resistance furnace under Ar / H 2 (H 2accounted for 3% of the volume), first heated to 450°C at a rate of 10°C / min for 12 hours, then cooled to room temperature at a rate of 10°C / min, took out the powder and pressed it into tablets, and then ...

Embodiment 2

[0032] 3.0 grams of conductive activated carbon acetylene black was acid-treated for 24 hours, then washed with a solvent until neutral, dried at 120°C, ground and dispersed in 100ml of absolute ethanol. 19.8 g MnCl 2 4H 2 O, 20.4 g LiAc 2H 2 O, 20.8 g Si(OC 2 h 5 ) 4 and 7.7 g CH 3 COONH 4 Dissolve in 200ml of absolute ethanol, and stir magnetically at room temperature for 24h. Then the above-mentioned acid-treated dispersed porous carbon is miscible with the metal ion solution, stirred at room temperature for 24 hours, then slowly heated to 80°C, and adjusted to a pH value of 12, magnetically stirred for 12 hours, and finally 1 gram of sucrose was added and stirred for 12 hours, Dry under vacuum at 100°C. Transfer it to a porcelain boat in a tube resistance furnace under Ar / H 2 (H 2 accounted for 3% of the volume), first heated to 450°C at a rate of 10°C / min for 12 hours, then cooled to room temperature at a rate of 10°C / min, took out the powder and pressed it into...

Embodiment 3

[0035] 1.0 grams of conductive activated carbon BP2000 was treated with acid for 24 hours, then washed with solvent until neutral, dried at 110°C, ground and dispersed in 100ml of absolute ethanol. 28.1 g CoSO 4 ·7H 2 O, 20.4 g LiAc 2H 2 O, 20.8 g Si(OC 2 h 5 ) 4 and 7.7 g CH 3 COONH 4 Dissolve in 200ml of absolute ethanol, and stir magnetically at room temperature for 8h. Then the dispersed porous carbon after the above acid treatment was miscible with the metal ion solution, stirred at room temperature for 12 hours, then slowly heated to 100°C, and adjusted to a pH value of 11, magnetically stirred for 6 hours, and finally added 3 grams of asphalt and stirred for 12 hours, Dry under vacuum at 100°C. Transfer it to a porcelain boat in a tubular resistance furnace in Ar, first heat it to 450°C at a rate of 10°C / min for 12 hours, then cool it down to room temperature at a rate of 10°C / min, take out the powder and press it into a tablet, and then Calcined at 800 °C for ...

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Abstract

The invention relates to a C / Li2MSiO4-xNy / C (M=Fe, Mn, Co) composite positive electrode material with outstanding electrochemical performances for a secondary lithium ion battery and a preparation method thereof. According to the technical scheme of the invention, the nitrogen element is doped to partially replace oxygen in a crystal structure; the charge balance in a material is controlled by the lithium ion content; a solid phase reactor is formed by organic carbon and inorganic porous carbon; and an N-doped silicate carbon composite positive electrode material with outstanding electrochemical performances for the secondary lithium ion battery is synthesized by utilizing a high-temperature carbon thermal reduction method. The material prepared by the method provided by the invention has the advantages of higher charge-discharge specific capacity, preferable multiplying power efficiency and very good use value, and is especially suitable for power batteries.

Description

technical field [0001] The invention relates to a secondary lithium ion battery C / Li with excellent electrochemical performance 2 MSiO 4-x N y / C (M=Fe, Mn, Co) composite cathode material and preparation method. Background technique [0002] The advantages of abundant natural reserves of silicon, environmental friendliness and high structural stability make silicate a potential cathode material for lithium-ion batteries. Orthosilicate Li 2 MSiO 4 (M=Mn, Fe, Mn / Fe, Co, Ni) belongs to the orthorhombic crystal system, and the space group is Pmn21 (Table 2); it has a structure similar to Li3PO4, and all cations exist in the form of tetrahedral coordination. Its structure Can be regarded as [SiMO 4 ] layers are infinitely expanded along the ac plane, each SiO 4 Co-point with four adjacent MO4. Li ions are located in two [SiMO 4 ] the tetrahedral positions between the layers, and each LiO 4 There are three oxygen atoms in the tetrahedron in the same [SiMO 4 ] layer, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 木士春丁刚何华锋丁家伟张洁耿德英孙健唐华平
Owner JIANGSU ZHENGTONG ELECTRONICS TECH
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