Preparation method of lithium ion battery anode material using biomass as carbon source and with C@Co3O4 core-shell structure

A lithium-ion battery, core-shell structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of large volume effect, poor conductivity, etc., to improve lithium storage capacity, improve conductivity, increase The effect of conductivity

Active Publication Date: 2016-08-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, Co 3 o 4 The large volume effect and poor conductivity itself limit its commercial application

Method used

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  • Preparation method of lithium ion battery anode material using biomass as carbon source and with C@Co3O4 core-shell structure
  • Preparation method of lithium ion battery anode material using biomass as carbon source and with C@Co3O4 core-shell structure
  • Preparation method of lithium ion battery anode material using biomass as carbon source and with C@Co3O4 core-shell structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: A kind of CCo with biomass as carbon source 3 o 4 The preparation method of core-shell structure lithium ion battery negative electrode material,

[0017] 1) Wash the dried fungus and put it into an oven to dry, grind and pass through a 50-mesh nylon sieve to obtain the fungus particles and dry them for later use;

[0018] 2) Prepare 60ml of sulfuric acid solution with a concentration of 5mol / L, put 3g of fungus particles into the sulfuric acid solution and transfer it to a hydrothermal kettle, set the hydrothermal temperature to 120°C, keep it warm for 24h, suction filter and freeze-dry for 12h to obtain the precursor A;

[0019] 3) Get 0.02mol of analytically pure cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 0.06mol of urea (CO(NH 2 ) 2 ) were added to 100ml of deionized water in turn, stirred until the solution was clear and transparent, then 3g of precursor A was put into the solution, magnetically stirred for 12 hours, then suction f...

Embodiment 2

[0025] Embodiment 2: A kind of CCo with biomass as carbon source 3 o 4 The preparation method of core-shell structure lithium ion battery negative electrode material,

[0026] 1) Wash the dried fungus and put it into an oven to dry, grind and pass through a 50-mesh nylon sieve to obtain the fungus particles and dry them for later use;

[0027] 2) Configure 60ml of sulfuric acid solution with a concentration of 8mol / L, put 5g of fungus particles into the sulfuric acid solution and transfer it to a hydrothermal kettle, set the hydrothermal temperature to 140°C, keep it warm for 26h, suction filter and freeze-dry for 14h to obtain the precursor A;

[0028] 3) Get 0.03mol of analytically pure cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 0.06mol of urea (CO(NH 2 ) 2 ) were added to 100ml of deionized water in turn, stirred until the solution was clear and transparent, then 4g of precursor A was put into the solution, magnetically stirred for 16 hours, then suction...

Embodiment 3

[0031] Embodiment 3: A kind of CCo with biomass as carbon source 3 o 4 The preparation method of core-shell structure lithium ion battery negative electrode material,

[0032] 1) Wash the dried fungus and put it into an oven to dry, grind and pass through a 50-mesh nylon sieve to obtain the fungus particles and dry them for later use;

[0033] 2) Prepare 60ml of sulfuric acid solution with a concentration of 10mol / L, put 8g of fungus particles into the sulfuric acid solution and transfer it to a hydrothermal kettle, set the hydrothermal temperature to 160°C, keep it warm for 28h, suction filter and freeze-dry for 18h to obtain the precursor A;

[0034] 3) Get 0.04mol of analytically pure cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) and 0.06mol of urea (CO(NH 2 ) 2 ) were added to 100ml of deionized water in turn, stirred until the solution was clear and transparent, then 5g of precursor A was put into the solution, magnetically stirred for 18h, then suction filte...

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Abstract

Provided is a preparation method of a lithium ion battery anode material using biomass as a carbon source and with a C@Co3O4 core-shell structure .Edible fungus is utilized as biomass carbon, a carbon sphere precursor having surface activity is obtained through hydrothermal carbonization of concentrated sulfuric acid and then is heated and stirred in a solution containing cobalt salt to make the cobalt salt adsorbed on the surface, and then the lithium ion battery anode material with the C@Co3O4 core-shell structure is obtained through heat treatment .The electrical conductivity of the material is not only improved, the volume expansion effect of Co3O4 in the charging and discharging process is also relieved, and a Co3O4 structure is stabilized, so that the cycling stability and rate performance of a lithium ion battery are improved somewhat, and the lithium ion battery anode material having excellent electrochemical properties is obtained .

Description

technical field [0001] The present invention relates to a kind of preparation method of negative electrode material of lithium ion battery, specifically relate to a kind of CCo with biomass as carbon source 3 o 4 The invention discloses a method for preparing a negative electrode material of a lithium-ion battery with a core-shell structure. Background technique [0002] Lithium-ion batteries have become the preferred power source for various portable electronic devices due to their advantages such as large specific energy, high voltage, stable discharge voltage and long working life. Graphite is currently the main negative electrode material for lithium-ion batteries, but the theoretical capacity of graphite is low (372mAh / g), which is difficult to meet the requirements of high-capacity batteries. Therefore, finding a negative electrode material that can replace graphite is a current research hotspot. Transition metal oxide Co 3 o 4 Due to its high theoretical capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525
CPCH01M4/366H01M4/52H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 曹丽云康倩李嘉胤黄剑锋许占位吴建鹏贺菊菊席乔
Owner SHAANXI UNIV OF SCI & TECH
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