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Preparation method for carbon-doped lithium stannate cathodal material for lithium batteries

A negative electrode material, lithium stannate technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of large irreversible capacity, and achieve the effects of avoiding excessive capacity decay, inhibiting agglomeration, and alleviating volume changes

Active Publication Date: 2012-01-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the existing methods of preparing pure phase Li 2 SnO 3 Due to the lack of large initial irreversible capacity, the present invention provides a method for preparing a carbon-doped lithium stannate negative electrode material for a lithium battery

Method used

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  • Preparation method for carbon-doped lithium stannate cathodal material for lithium batteries
  • Preparation method for carbon-doped lithium stannate cathodal material for lithium batteries
  • Preparation method for carbon-doped lithium stannate cathodal material for lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Hydrothermal process:

[0020] (a) A solution: SnCl 4 ·5H 2 O, LiOH and deionization were mixed in a ratio (molar ratio) of 1:6:1.67 to obtain A solution;

[0021] (b) Solution B: fully mix polyethylene glycol, absolute ethanol and deionized water at a ratio (molar ratio) of 1:98:35 to obtain Solution B;

[0022] (c) After the two are fully dissolved, under magnetic stirring, slowly drop the A solution into the B solution to completely dissolve it;

[0023] (d) Then, in the mixed solution, add 2.2mol / L glucose aqueous solution, and continue to stir until completely dissolved;

[0024] (e) Transfer the mixed solution into a 100ml stainless steel reaction kettle and keep it warm at 170°C for 24h.

[0025] (2) After centrifuging and washing the obtained material several times with deionized water and absolute ethanol, transfer it to a petri dish, put it in an oven, and dry it in an oven at 55°C to obtain a precursor;

[0026] (3) Heat treatment process: the precur...

Embodiment 2

[0029] (1) Hydrothermal process:

[0030] (a) A solution: SnCl 4 ·5H 2 O, LiOH and deionization were mixed in a ratio (molar ratio) of 1:6:1.67 to obtain A solution;

[0031] (b) Solution B: fully mix polyethylene glycol, absolute ethanol and deionized water at a ratio of 1:98:35 (molar ratio) to obtain Solution B;

[0032] (c) After the two are fully dissolved, under magnetic stirring, slowly drop the A solution into the B solution to completely dissolve it;

[0033](d) Then, in the mixed solution, add 2.2mol / L glucose aqueous solution, and continue to stir until completely dissolved;

[0034] (e) Move the mixed solution into a 100ml stainless steel reactor and keep it warm at 173°C for 22h.

[0035] (2) After centrifuging and washing the obtained material several times with deionized water and absolute ethanol, transfer it to a petri dish, put it in an oven, and dry it in an oven at 58°C to obtain a precursor;

[0036] (3) Heat treatment process: the precursor was sinte...

Embodiment 3

[0039] (1) Hydrothermal process:

[0040] (a) A solution: SnCl 4 ·5H 2 O, LiOH and deionization were mixed in a ratio (molar ratio) of 1:6:1.67 to obtain A solution;

[0041] (b) Solution B: fully mix polyethylene glycol, absolute ethanol and deionized water at a ratio (molar ratio) of 1:98:35 to obtain Solution B;

[0042] (c) After the two are fully dissolved, under magnetic stirring, slowly drop the A solution into the B solution to completely dissolve it;

[0043] (d) Then, in the mixed solution, add 2.2mol / L glucose aqueous solution, and continue to stir until completely dissolved;

[0044] (e) Transfer the mixed solution into a 100ml stainless steel reaction kettle and keep it warm at 176°C for 20h.

[0045] (2) After centrifuging and washing the obtained substance several times with deionized water and absolute ethanol, transfer it to a petri dish, put it in an oven, and dry it in an oven at 59°C to obtain a precursor;

[0046] (3) Heat treatment process: the precu...

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Abstract

The invention relates to a preparation method for a carbon-doped lithium stannate cathodal material for lithium batteries, which is used for solving the technical problem that the initial irreversible capacity of the pure-phase Li2SnO3 prepared by the conventional method is large. The technical scheme adopts a hydrothermal method to directly synthesize a Li2SnO3 precursor and then sinters the Li2SnO3 precursor under argon shield to obtain the carbon-doped lithium stannate material. Because of the doped carbon, the volume change caused by charging and discharging is effectively relieved, the phenomenon of 'aggregation' is inhibited during lithium intercalation and separation reactions, the electrode capacity of the material is prevented from decaying over-fast, the initial irreversible capacity is reduced to 289.2mAhg<-1> to 489.8mAhg<-1> from the 657mAhg<-1> of the background art under the condition that the current density is 60mAg<-1> and that the charge-discharge voltage range is 0.05V to 2.0V, consequently, the capacity of the carbon-doped lithium stannate cathodal material is far larger than the theoretical capacity of ordinary carbon material, and the cycle performance of the carbon-doped lithium stannate cathodal material is higher than the cycle performance of the pure-phase Li2SnO3.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery negative electrode material, in particular to a preparation method of a lithium battery carbon-doped lithium stannate negative electrode material. Background technique [0002] Tin-based materials are ideal anode materials for lithium-ion batteries due to their high theoretical capacity, low cost, low toxicity, and broad practicability. Document " " Journal of Alloys and Compounds ", 415,1-2 (2006) pp.229-233 " discloses a kind of lithium stannate (hereinafter referred to as Li 2 SnO 3 ) The preparation method of the material. In this method, a pure-phase Li was synthesized by a sol-gel method. 2 SnO 3 . The method is to add SnCl 4 ·5H 2 O is dissolved in ethylene glycol, and after stirring, citric acid is added to obtain a sol, and the obtained sol is dried in a drying oven to crystallize the sol; Combustion until complete; pre-burn the obtained xerogel at a temperature of 400°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 黄英王秋芬赵阳齐暑华王岩姚文慧王雷张银玲何倩宗蒙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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