Preparation method for porous graphitized hard carbon for high-rate sodium ion battery cathode

A sodium-ion battery, porous graphite technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of poor rate performance, poor conductivity, capacity decline, etc., and achieve improved conductivity, easy operation, and steps. simple effect

Inactive Publication Date: 2018-09-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inherent disadvantages of hard carbon materials are their disordered structure and poor conductivity, which will lead to a sharp drop in their capacity under high current and poor rate performance.

Method used

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  • Preparation method for porous graphitized hard carbon for high-rate sodium ion battery cathode
  • Preparation method for porous graphitized hard carbon for high-rate sodium ion battery cathode
  • Preparation method for porous graphitized hard carbon for high-rate sodium ion battery cathode

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Embodiment 1

[0034] This embodiment relates to a preparation method of porous graphitized hard carbon for a negative electrode of a high-rate sodium ion battery, comprising the following steps:

[0035] (1) Cross-linking reaction: 25 g of sodium alginate was dissolved in 975 mL of deionized water to prepare a solution with a mass fraction of 2.5%. Dissolve 50 g of cobalt nitrate in 950 mL of deionized water to prepare a solution with a mass fraction of 5%. The sodium alginate solution was slowly added dropwise into the cobalt nitrate solution, and the volume ratio of the sodium alginate solution to the cobalt nitrate solution was 4:5. Let stand for 24 hours and wait for the cross-linking reaction to complete. Soak the cobalt alginate obtained by cross-linking in deionized water, wash it repeatedly three times, remove the cobalt ions on the surface that do not participate in the cross-linking reaction, and then freeze-dry for 24 hours.

[0036] (2) Carbonization: Transfer the freeze-dried...

Embodiment 2

[0041] This embodiment relates to a preparation method of porous graphitized hard carbon for a negative electrode of a high-rate sodium ion battery, comprising the following steps:

[0042] (1) Take 2 g of sodium alginate and dissolve it in 998 mL of deionized water to prepare a solution with a mass fraction of 0.2%. Take 25g of nickel nitrate and dissolve it in 975mL of deionized water to prepare a solution with a mass fraction of 2.5%. The sodium alginate solution is placed in a spray bottle and slowly sprayed into the nickel nitrate solution to obtain a nickel alginate gel film. The nickel alginate gel film was washed three times with deionized water, and freeze-dried for 24 hours.

[0043] (2) Take dry nickel alginate, put it into a tube furnace, pass in argon gas, raise the temperature to 1200°C at a rate of 10°C / min, keep it warm for 12 hours, take it out after natural cooling, and obtain nano-nickel / carbon composite Material.

[0044] (3) Add the nano-nickel / carbon c...

Embodiment 3

[0047] This embodiment relates to a preparation method of porous graphitized hard carbon for a negative electrode of a high-rate sodium ion battery, comprising the following steps:

[0048] (1) Take 100g of sodium alginate and dissolve it in 900mL of deionized water to prepare a solution with a mass fraction of 10%. Take 100g of ferric nitrate and dissolve it in 900mL of deionized water to prepare a solution with a mass fraction of 10%. The sodium alginate solution and the ferric nitrate solution were mixed according to the mass ratio of 1:1. The obtained iron alginate gel was repeatedly washed three times with deionized water, and freeze-dried for 24 hours.

[0049] (2) Take dry iron alginate, put it into a tube furnace, pass in argon gas, raise the temperature to 1000°C at a rate of 10°C / min, keep it warm for 12 hours, take it out after natural cooling, and obtain nano-iron / carbon composite Material.

[0050] (3) Add the nano-nickel / carbon composite material into 1L hydro...

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Abstract

The invention discloses a preparation method for porous graphitized hard carbon for a high-rate sodium ion battery cathode. The preparation method mainly comprises the following steps: at first, performing interlinking reaction on sodium alginate and a cation of a polyvalent transition metal with a catalytic graphitization effect; then preparing a nanometal / carbon composite material by use of a carbonization catalytic graphitization method; finally removing nanometal catalyst particles by use of an acid washing process to obtain a graphitized hard carbon cathode material of a relatively ordered nano-mesoporous structure. According to the preparation method, uniform nanopores are introduced into the hard carbon by use of interlinking and acid washing methods, and the degree of order of a graphene layer of mesoporous surface carbon is improved by use of an in-situ catalytic graphitization method, so that the prepared porous graphitized hard carbon material is endowed with good pore channels, high electrical conductivity and high-capacity and high-rate sodium storage property and is more favorable for rapid introduction / removal of sodium ions and electrons.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for sodium ion batteries, in particular to a method for preparing porous graphitized hard carbon for high rate sodium ion battery negative electrodes. Background technique [0002] With the rapid development of portable electronic devices and new energy vehicles, lithium-ion batteries have become the most widely used energy storage devices worldwide due to their advantages such as high energy density, long cycle life, safe use, and environmental friendliness. However, the lithium reserves on the earth are very limited and the price is relatively high, so the future development of lithium-ion batteries is limited. Sodium and lithium are in the same main group, have similar electrochemical properties, and the earth reserves of sodium are abundant and cheap. Sodium-ion batteries have become the most potential substitutes for lithium-ion batteries. [0003] At present, the anode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/054
CPCH01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 刘庆雷王宁张荻
Owner SHANGHAI JIAO TONG UNIV
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