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Cobalt carbonate-polypyrrole composite anode material used for power lithium ion battery and preparation method thereof

A negative electrode material, cobalt carbonate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low energy density and bulk density of negative electrodes, and achieve a simple preparation method, easy mass production, and excellent cycle stability. Effect

Inactive Publication Date: 2014-11-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art above, the present invention provides a cobalt carbonate-polypyrrole composite negative electrode material for power lithium batteries and a preparation method thereof. The present invention solves the problems of low energy density and volume density of negative electrodes of graphite-type lithium ion batteries at present. The electrode exhibits excellent cycle stability, rate capability and superior capacity recovery

Method used

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  • Cobalt carbonate-polypyrrole composite anode material used for power lithium ion battery and preparation method thereof
  • Cobalt carbonate-polypyrrole composite anode material used for power lithium ion battery and preparation method thereof
  • Cobalt carbonate-polypyrrole composite anode material used for power lithium ion battery and preparation method thereof

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Embodiment 1

[0029] 2.8829g urea and 0.0865g CTAB were ultrasonically dissolved in 60ml deionized water to form a clear solution A; 2.8115g CoSO 4 ·7H 2 O was dissolved in 20ml of deionized water to form solution B; solution B was added dropwise to A, and after magnetic stirring for 10 minutes, 80ml of the mixed solution was transferred into a 100ml polytetrafluoroethylene liner reactor, kept at 120°C for 12h, and waited for reaction After the kettle was naturally cooled to room temperature, the hydrothermal product was successively washed with water, isopropanol and ethanol by suction filtration, and then vacuum-dried at 50°C for 12 hours to obtain rose-red CoCO 3 powder. Dissolve 0.0086g of sodium lauryl sulfate in 400ml of deionized water, then add 0.1g of hydrothermally obtained CoCO 3 Powder, ultrasonicated for 5 minutes and stirred vigorously for 2 hours to fully disperse; add 0.1g of pyrrole monomer to the above suspension and stir for 1 hour; finally add 5ml of 0.06M ferric chlor...

Embodiment 2

[0031] 12.6126g of urea and 0.6306g of CTAB were ultrasonically dissolved in 60ml of deionized water to form a clear solution A; 4.7586g of CoCl 2 ·6H 2 O was dissolved in 20 ml of deionized water to form solution B. Add solution B to A drop by drop, and after magnetically stirring for 10 minutes, transfer 80ml of the mixed solution into a 100ml polytetrafluoroethylene liner reactor and keep it warm at 180°C for 6 hours. , isopropanol and ethanol, and then vacuum-dried at 50°C for 12 hours to obtain rose red CoCO 3 powder. Dissolve 0.8120g of sodium dodecylsulfonate in 400ml of deionized water, then add 1g of hydrothermally obtained CoCO 3 Powder, ultrasonicated for 5 minutes and then vigorously stirred for 2 hours to fully disperse; add 4g of pyrrole monomer to the above suspension and stir for 1 hour; finally add 10ml of 5.96M ferric chloride solution dropwise to initiate polymerization, and continue stirring at room temperature for 2 hours . The black cobalt carbonate-...

Embodiment 3

[0033] 7.2.72g of urea and 0.2883g of CTAB were ultrasonically dissolved in 60ml of deionized water to form a clear solution A; 2.6553g of Co(CH 3 COO) 2 4H 2 O was dissolved in 20 ml of deionized water to form solution B. Add solution B to A drop by drop, and after magnetically stirring for 10 minutes, transfer 80ml of the mixed solution into a reaction kettle with a 100ml polytetrafluoroethylene liner and keep it warm at 200°C for 3 hours. , isopropanol and ethanol, and then vacuum-dried at 50°C for 12 hours to obtain rose red CoCO 3 powder. Dissolve 0.1818g of sodium dodecylbenzenesulfonate in 400ml of deionized water, then add 0.5g of hydrothermally obtained CoCO 3 Powder, ultrasonicated for 5 minutes and stirred vigorously for 2 hours to fully disperse; add 1.0g of pyrrole monomer to the above suspension and stir for 1 hour; finally add 6ml of 1.49M ferric chloride solution dropwise to initiate polymerization, and continue stirring at room temperature 24h. The black...

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Abstract

The invention discloses a cobalt carbonate-polypyrrole composite anode material used for a power lithium ion battery and a preparation method thereof. The material is in a micro-nano-scale spheroid core-shell structure in which an exterior is a cobalt carbonate core which is coated by polypyrrole. The composite anode material is 3-5 [mu]m in particle sizes. The cobalt carbonate core is assembled by nanometer rods with widths being 20-50 nm. A thickness of a polypyrrole coating layer is 0.3-1 [mu]m. The polypyrrole coating layer is formed, in an aggregation manner, from polypyrrole nanometer particles with particle sizes being 50-100 nm. The preparation method includes following steps: dispersing CoCO3 powder into water in which a surfactant is dissolved to prepare a suspension; adding a pyrrole monomer to the suspension with mixing uniformly; adding ferric chloride to carry out a polymerization reaction; performing a filtering process and collecting a cobalt carbonate-polypyrrole precipitate after the reaction being finished; and performing a washing process and a drying process to obtain the cobalt carbonate-polypyrrole composite anode material. The composite anode material has excellent circulation stability, an excellent rate capability and a very strong capacity recovering capability. In addition, the preparation method is simple and is easy to carry out in large-scale production.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a cobalt carbonate-polypyrrole composite negative electrode material for power lithium batteries and a preparation method thereof. Background technique [0002] With the vigorous development of lithium-ion batteries from small electronic devices to electric vehicles, the market has put forward higher requirements for their portability and energy density. The existing commercial negative electrode material - graphite is obviously difficult to meet such requirements. Therefore, Researchers from various countries have introduced a variety of alternative negative electrode materials, which can be divided into three types: insertion type, alloy type and conversion type in terms of lithium storage mechanism. Insertion-type anodes have good cycle stability but low capacity (TiO 2 and Li4Ti 5 o 12 The reversible capacities are lower than 250 and...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/137H01M4/1397H01M4/1399H01M4/62
CPCH01M4/366H01M4/58H01M10/0525Y02E60/10
Inventor 张建新丁昭郡姚斌冯小钰路婷婷
Owner SHANDONG UNIV
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