CN109888206B - Lithium ion battery cathode material Bi/Bi2O3C, preparation and application thereof - Google Patents

Lithium ion battery cathode material Bi/Bi2O3C, preparation and application thereof Download PDF

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CN109888206B
CN109888206B CN201910065592.8A CN201910065592A CN109888206B CN 109888206 B CN109888206 B CN 109888206B CN 201910065592 A CN201910065592 A CN 201910065592A CN 109888206 B CN109888206 B CN 109888206B
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reaction
composite material
bismuth
lithium ion
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CN109888206A (en
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李中春
潘红琳
王迪
江钰
郁佳伦
张开龙
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Jiangsu University of Technology
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Abstract

The invention relates to a lithium ion battery cathode material Bi/Bi2O3a/C and preparation and application thereof, belonging to the field of inorganic material preparation and nano energy. The invention mainly comprises two parts: (1) firstly, dissolving bismuth salt in a mixed solvent, then adding an organic acid coordination agent, and synthesizing a bismuth complex by a solvothermal method; (2) under the action of protective gas, heat-treating the bismuth complex prepared in the step (1) to obtain Bi/Bi2O3a/C composite material. At a current density of 100mA/g, Bi/Bi2O3The first discharge specific capacity of the/C composite material can reach 352 mAh/g. Bi/Bi of the present invention2O3The preparation method of the/C composite material is simple and easy to implement, and the nano carbon, Bi and Bi generated by ligand pyrolysis2O3Closely combined together, is beneficial to increasing active sites and improving the conductivity and stability of the material, and Bi/Bi2O3the/C composite material is used as a lithium ion battery cathode material, and the specific capacity is basically maintained at about 220mAh/g within 20-100 cycles. Bi/Bi2O3the/C composite material has wide application prospect in the lithium ion battery cathode material.

Description

Lithium ion battery cathode material Bi/Bi2O3C, preparation and application thereof
Technical Field
The invention belongs to the field of inorganic material preparation and nano energy, and particularly relates to a lithium ion battery cathode material Bi/Bi2O3a/C and preparation and application thereof.
Background
Bismuth oxide (Bi)2O3) Is an important functional material, and is widely applied to photoelectric conversion materials, high-temperature superconducting materials, electronic ceramic materials and the like due to the special physical properties of the material. In addition, Bi2O3It can also be used in chemical reagent, fire-proof material, high-refractivity glass, nuclear engineering glass manufacture, nuclear reactor fuel, etc. Bismuth oxide is considered as a potential electrode material because of its excellent electrochemical stability and good redox reversibility. In order to obtain a battery having high energy density and long cycle stability, development of a negative electrode material having excellent properties is urgently required. The metallic bismuth has received wide attention from technologists due to the high reversibility of redox reaction and wide potential window. However, the specific capacity and stability of the bismuth negative electrode reported so far are not very satisfactory. Therefore, it is necessary to develop a Bi-based composite or hybrid to improve the performance of the Bi negative electrode.
A Bi document is disclosed in ChemPluschem 2015 80 vol 1000-10062O3An anode material for a sodium-ion storage. The authors of the paper first stirred Bi (NO)3)3·5H2O, CTAB into the graphene oxide dispersion, and then adding NaBH dropwise4Filtering and drying to obtain Bi2O3@ RGO complex, which is then used as a negative electrode material of a battery. At a current density of 350 mA/g, the capacity retention rate is only 70.2 percent after 200 cycles. Although Bi produced by this method2O3The @ RGO complex exhibits a high specific capacity, but has poor cycle stability, which is not favorable for practical applications.
So far, no document reports about Bi/Bi2O3the/C composite material is used as a lithium ion battery cathode material.
Disclosure of Invention
The invention aims to provide a lithium ion battery cathode material Bi/Bi2O3a/C and preparation and application thereof. Obtaining Bi/Bi by one-step pyrolysis of bismuth-organic acid complex2O3the/C composite material is beneficial to improving the conductivity and the number of active sites of the composite material, thereby further improving the performance of the composite material. The method has the advantages of simple process, simple and convenient operation and mild conditions, and is suitable for industrial production.
The specific technical scheme is as follows:
the invention provides a lithium ion battery cathode material Bi/Bi2O3A method for preparing/C, the method comprising the steps of:
(1) dissolving bismuth salt in a solvent, and then adding an organic acid coordination agent to form a reaction mixed solution;
(2) carrying out solvothermal reaction on the mixed solution obtained in the step (1), cooling to room temperature after the reaction is finished, and carrying out post-treatment on the reaction mixture to obtain a bismuth complex;
(3) grinding the complex obtained in the step (2);
(4) under the action of protective gas, thermally treating the powder obtained in the step (3) in a tube furnace to obtain Bi/Bi2O3a/C composite material.
Wherein the bismuth salt in the step (1) is one or two of bismuth chloride and bismuth nitrate.
Wherein, the solvent in the step (1) is one or more than two of N, N-dimethylformamide, methanol, formamide or ethanol.
The solvent in the step (1) is a mixed solvent, the mixed solvent is one of N, N-dimethylformamide and methanol, formamide and ethanol, and N, N-dimethylformamide and ethanol, and the corresponding volume ratio is 1: 5-5: 1.
Wherein, the organic acid ligand agent in the step (1) is one or more than two of 1,3, 5-benzene tricarboxylic acid, terephthalic acid or 4, 4' -biphenyl dicarboxylic acid.
Wherein the molar ratio of the bismuth salt to the organic acid ligand in the step (1) is 1: 1-1: 4; the concentration of the bismuth salt in the solvent is 5-50 g/L.
Wherein the temperature of the solvothermal reaction in the step (2) is 100-160 ℃, and the reaction time is 6-12 h.
And (2) transferring the mixed solution obtained in the step (1) into a polytetrafluoroethylene lining, and filling the polytetrafluoroethylene lining into a reaction kettle shell, wherein the post-treatment is to centrifugally separate a product after the reaction, and then washing the product by using one or more of N, N-dimethylformamide, formamide, methanol or ethanol. Optionally, the isolated precipitate is washed sequentially with N, N-dimethylformamide or formamide, methanol or ethanol.
And (3) performing post-treatment in the step (2), namely centrifuging and washing the mixture, and performing vacuum drying on the precipitate at the temperature of 60-90 ℃.
Wherein the heat treatment in the step (4) is carried out at 400-600 ℃ for 60-120 min; the protective gas is one or more than two of inert gases of argon or nitrogen.
In another aspect, the present application provides a Bi/Bi composition prepared according to the above-mentioned preparation method2O3a/C composite material.
On the other hand, the application provides a Bi/Bi material according to the above2O3The application of the/C composite material in the negative electrode material of the lithium ion battery.
The invention has the following beneficial effects:
1) the method has the advantages of simple process, simple and convenient operation, mild conditions and good repeatability.
2) Nano carbon and Bi produced by pyrolysis and Bi2O3The active sites are increased, and the conductivity and the stability of the material are improved.
3)Bi/Bi2O3the/C composite material has good cycle stability when being used as a lithium ion battery cathode material.
Drawings
FIG. 1 shows Bi/Bi prepared in example 12O3XRD pattern of the/C composite material.
FIG. 2 shows Bi/Bi prepared in example 12O3CV diagram of/C negative electrode.
FIG. 3 shows Bi/Bi prepared in example 12O3Cycle performance diagram of the/C negative electrode.
FIG. 4 shows Bi/Bi prepared in example 22O3Cycle performance diagram of the/C negative electrode.
Detailed Description
The process of the present invention is further illustrated and described below with reference to examples.
Example 1
Bi/Bi2O3The preparation method of the/C composite material comprises the following steps:
(1) 10.0mL of DMF and 20.0mL of methanol were weighed and mixed well, and 0.97g of bismuth nitrate pentahydrate and 0.84g of 1,3, 5-benzenetricarboxylic acid were dissolved in the mixed solvent.
(2) Transferring the reaction mixture obtained in the step (1) into a polytetrafluoroethylene lining, sealing the polytetrafluoroethylene lining in a stainless steel reaction kettle, carrying out solvothermal reaction at the reaction temperature of 120 ℃ for 12 hours, naturally cooling to room temperature after the reaction is finished, carrying out centrifugal separation, washing precipitates with DMF (dimethyl formamide) and methanol sequentially, and drying the precipitates at the temperature of 60 ℃ in vacuum to obtain a powdery complex.
(3) Grinding 1.0g of powdery complex, putting the mixture into a porcelain boat, putting the porcelain boat into a tube furnace, heating the mixture to 600 ℃ at the heating rate of 2 ℃/min under the protection of argon, preserving the temperature for 2 hours, and obtaining Bi/Bi after the reaction is finished2O3a/C composite material of Bi/Bi2O3The XRD pattern of the/C composite material is shown in figure 1.
Example 2
(1) 20.0mL of DMF and 10.0mL of methanol were weighed and mixed uniformly, and 0.97g of bismuth nitrate pentahydrate and 0.66g of terephthalic acid were dissolved in the mixed solvent.
(2) Transferring the reaction mixture obtained in the step (1) into a polytetrafluoroethylene lining, sealing the polytetrafluoroethylene lining in a stainless steel reaction kettle, carrying out solvothermal reaction at the reaction temperature of 160 ℃ for 12 hours, naturally cooling to room temperature after the reaction is finished, carrying out centrifugal separation, washing precipitates with DMF (dimethyl formamide) and ethanol in sequence, and drying the precipitates at the temperature of 60 ℃ in vacuum to obtain a powdery complex.
(3) Grinding 1.0g of powdery complex, putting the mixture into a porcelain boat, putting the porcelain boat into a tube furnace, heating the mixture to 500 ℃ at the heating rate of 5 ℃/min under the protection of argon, preserving the heat for 1 hour, and obtaining Bi/Bi after the reaction is finished2O3a/C composite material.
Example 3
(1) 15.0mL of formamide and 15.0mL of methanol were weighed and mixed uniformly, and 0.63g of bismuth chloride and 0.97g of 4, 4' -biphenyldicarboxylic acid were dissolved in the mixed solvent.
(2) Transferring the reaction mixture obtained in the step (1) into a polytetrafluoroethylene lining, sealing the polytetrafluoroethylene lining in a stainless steel reaction kettle, carrying out solvothermal reaction at the reaction temperature of 100 ℃ for 12 hours, naturally cooling to room temperature after the reaction is finished, carrying out centrifugal separation, washing precipitates with DMF (dimethyl formamide) and ethanol in sequence, and drying the precipitates at the temperature of 60 ℃ in vacuum to obtain a powdery complex.
(3) Grinding 1.0g of powdery complex, putting the mixture into a porcelain boat, putting the porcelain boat into a tube furnace, heating the mixture to 400 ℃ at the heating rate of 2 ℃/min under the protection of argon, preserving the temperature for 2 hours, and obtaining Bi/Bi after the reaction is finished2O3a/C composite material.
Bi/Bi prepared as in example 12O3the/C composite material is the cathode of the lithium ion battery and is assembled into a button battery, and the cyclic voltammetry curve graph of the button battery is shown in 2. As can be seen from FIG. 2, there is a strong reduction peak around 0.26V, and the reduction potential is low; there is a strong oxidation peak around 1.29V. The lower reduction peak is advantageous for its use as a negative electrode material for lithium ion batteries. FIG. 3 shows Bi/Bi at a current density of 100mA/g2O3Cycle performance diagram of the/C negative electrode. As can be seen from FIG. 3, the specific capacity was about 220.7mAh/g over 105 cycles. The specific capacity is basically maintained to be about 220mAh/g between 20 and 100 cycles, which shows that Bi/Bi2O3the/C composite material has excellent cycle stability.
Compared with the prior art, the invention provides a brand-new lithium ion battery cathode material, and the invention has the advantages of simple process, simple and convenient operation, mild conditions and good repeatability. Nano carbon and Bi produced by pyrolysis and Bi2O3Are tightly combined togetherThe method is beneficial to increasing active sites and improving the conductivity and stability of the material. And Bi/Bi2O3the/C composite material has good cycle stability when being used as a lithium ion battery cathode material.
Bi/Bi prepared as in example 22O3the/C composite material is the negative electrode of the lithium ion battery, and the cycling performance of the button cell assembled by the composite material under the current density of 200mA/g is shown in figure 4. As can be seen from FIG. 4, the specific capacity was about 191.8mAh/g over 280 cycles. The specific capacity is basically maintained at about the value between 20 and 280 cycles, further explaining that Bi/Bi2O3the/C composite material has excellent cycle stability.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes, additions and substitutions as suggested by those skilled in the art can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (11)

1. Lithium ion battery cathode material Bi/Bi2O3The preparation method of the/C comprises the following steps:
(1) dissolving bismuth salt in a solvent, and then adding an organic acid coordination agent to form a reaction mixed solution;
(2) carrying out solvothermal reaction on the mixed solution obtained in the step (1), cooling to room temperature after the reaction is finished, and carrying out post-treatment on the reaction mixture to obtain a bismuth complex;
(3) grinding the complex obtained in the step (2);
(4) under the action of protective gas, thermally treating the powder obtained in the step (3) in a tube furnace to obtain Bi/Bi2O3a/C composite material.
2. The Bi/Bi according to claim 12O3The preparation method of the/C comprises the step of (1), wherein the bismuth salt is one or two of bismuth chloride and bismuth nitrate.
3. According to claimClaim 1 or 2 of the Bi/Bi2O3The preparation method of the/C comprises the step (1), wherein the solvent is one or more than two of N, N-dimethylformamide, methanol, formamide or ethanol.
4. The Bi/Bi according to claim 32O3The preparation method of the/C comprises the step (1) of mixing the solvent with one of N, N-dimethylformamide and methanol, formamide and ethanol, and N, N-dimethylformamide and ethanol, wherein the corresponding volume ratio of the mixed solvent to the methanol is 1: 5-5: 1.
5. The Bi/Bi according to claim 1 or 22O3The preparation method of the/C, wherein the organic acid coordination agent in the step (1) is one or more than two of 1,3, 5-benzene tricarboxylic acid, terephthalic acid and 4, 4' -biphenyl dicarboxylic acid.
6. The Bi/Bi according to claim 1 or 22O3The preparation method of the/C comprises the following steps of (1) enabling the molar ratio of the bismuth salt to the organic acid coordination agent to be 1: 1-1: 4; the concentration of the bismuth salt in the solvent is 5-50 g/L.
7. The Bi/Bi according to claim 12O3The preparation method of the/C comprises the step (2), wherein the temperature of the solvothermal reaction is 100-160 ℃, and the reaction time is 6-12 h.
8. The Bi/Bi according to claim 1 or 72O3The preparation method of the/C comprises the step (2), wherein in the step (1), the mixed solution is transferred into a polytetrafluoroethylene lining and is filled into the shell of a reaction kettle, and the post-treatment is to centrifugally separate the product after the reaction and then wash the product by using one or more of N, N-dimethylformamide, formamide, methanol or ethanol.
9. The Bi/Bi according to claim 1 or 72O3The preparation method of/C, wherein, step (2)) And the post-treatment is to centrifuge and wash the mixture, and then vacuum-dry the obtained precipitate at 60-90 ℃.
10. The Bi/Bi according to claim 12O3The preparation method of the/C comprises the following steps of (1) treating the heat treatment in the step (4) at 400-600 ℃ for 60-120 min; the protective gas is one of argon or nitrogen.
11. Bi/Bi produced by the production method according to any one of claims 1 to 102O3a/C composite material.
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CN113594481A (en) * 2021-07-22 2021-11-02 中国科学院上海硅酸盐研究所 Carbon dioxide reduction electrocatalyst and preparation method and application thereof
CN113839038A (en) * 2021-08-12 2021-12-24 山东大学 MOF-derived Bi @ C nano composite electrode material and preparation method thereof
CN113877528A (en) * 2021-10-28 2022-01-04 云南中烟工业有限责任公司 Porous composite material, preparation method and application thereof
CN114551828B (en) * 2022-01-28 2023-06-02 同济大学 Bi-MOF-derived bismuth oxide-based negative electrode material and preparation and application thereof
CN114735690B (en) * 2022-04-19 2022-10-28 湖南铂威新能源科技有限公司 Preparation method of artificial graphite composite negative electrode material for lithium ion battery
CN115799518B (en) * 2023-02-02 2023-05-05 暨南大学 Bismuth/bismuth oxide nano dot/carbon sheet composite material, preparation method and application thereof

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