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Preparation method and application of nitrogen-doped carbon-coated sodium-rich sodium cobalt ferricyanide material

A nitrogen-doped carbon and sodium cyanide technology, applied in nanotechnology, electrochemical generators, positive electrodes, etc. for materials and surface science, can solve problems such as the application of difficult solid-state sodium-ion batteries, and achieve good cycle stability properties, increasing the reversible specific capacity, and increasing the specific surface area

Pending Publication Date: 2022-06-17
HUBEI ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Prussian blue sodium ion cathode material provided by the invention contains

Method used

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  • Preparation method and application of nitrogen-doped carbon-coated sodium-rich sodium cobalt ferricyanide material
  • Preparation method and application of nitrogen-doped carbon-coated sodium-rich sodium cobalt ferricyanide material
  • Preparation method and application of nitrogen-doped carbon-coated sodium-rich sodium cobalt ferricyanide material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035]实施例1

[0036]一种富钠态Na2CoFe(CN)6-NC材料的制备方法，其步骤如下：

[0037]将0.48g六水合氯化钴(0.002mol)和3.5g聚乙烯吡咯烷酮(平均相对分子质量24000)溶于50mL蒸馏水中，得到溶液a；将0.33g铁氰化钾(0.001mol)溶于50mL蒸馏水中，得到溶液b，然后用蠕动泵以5mL / min的速率将溶液b抽入溶液a中进行混合，再充分搅拌12h得到混合溶液；先将混合溶液在25℃下陈化72h，然后离心，用乙醇洗涤3次，再100℃烘干，得到固体粉末；将固体粉末在马弗炉200℃中先热处理2h，再300℃热处理0.5h，冷却至室温后，得到前驱体粉体。将得到的前驱体粉体与50mg磷酸氢二钠在氩气条件下350℃保温3h，冷却至室温后，得到富钠态Na2CoFe(CN)6-NC电极材料。

Example Embodiment

[0038]实施例2

[0039]一种富钠态Na2CoFe(CN)6-NC材料的制备方法，其步骤如下：

[0040]将0.48g六水合氯化钴(0.002mol)和4.8g聚乙烯吡咯烷酮(平均相对分子质量24000)溶于50mL蒸馏水中，得到溶液a；将0.33g铁氰化钾(0.001mol)溶于50mL蒸馏水中，得到溶液b，然后用蠕动泵以5mL / min的速率将溶液b抽入溶液a中进行混合，再充分搅拌12h得到混合溶液；先将混合溶液在25℃下陈化72h，然后离心，用乙醇洗涤3次，再100℃烘干，得到固体粉末；将固体粉末在马弗炉200℃中先热处理2h，再300℃热处理0.5h，冷却至室温后，得到前驱体粉体。将得到的前驱体粉体与50mg磷酸氢二钠在氩气条件下350℃保温3h，冷却至室温后，得到富钠态Na2CoFe(CN)6-NC电极材料。

Example Embodiment

[0041]实施例3

[0042]一种富钠态Na2CoFe(CN)6-NC材料的制备方法，其步骤如下：

[0043]将0.48g六水合氯化钴和6.5g聚乙烯吡咯烷酮(平均相对分子质量24000)溶于50mL蒸馏水中，得到溶液a；将0.33g铁氰化钾溶于50mL蒸馏水中，得到溶液b，然后用蠕动泵以5mL / min的速率将溶液b抽入溶液a中进行混合，再充分搅拌12h得到混合溶液；先将混合溶液在25℃下陈化48h，然后离心，用乙醇洗涤3次，再100℃烘干，得到固体粉末；将固体粉末在马弗炉200℃中先热处理2h，再300℃热处理0.5h，冷却至室温后，得到前驱体粉体。将得到的前驱体粉体与50mg磷酸氢二钠在氩气条件下350℃保温3h，冷却至室温后，得到富钠态Na2CoFe(CN)6-NC电极材料。

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Abstract

The invention discloses a preparation method and application of a nitrogen-doped carbon-coated sodium-rich sodium cobalt ferricyanide material, and belongs to the field of sodium ion battery electrode materials. The preparation method comprises the following steps: S1, dissolving cobalt chloride and polyvinylpyrrolidone in deionized water to obtain a solution a; dissolving potassium ferricyanide in deionized water to obtain a solution b; mixing the solution a and the solution b, and stirring to obtain a mixed solution; s2, aging the mixed solution obtained in the step S1 at room temperature for 48-72 hours, and drying to obtain solid powder; s3, pre-sintering the solid obtained in the step S2, carrying out heat treatment, and cooling to room temperature to obtain precursor powder; and S4, roasting the precursor powder obtained in the step S3 and disodium hydrogen phosphate under protective gas, and cooling to room temperature to obtain the catalyst. According to the invention, the sodium-rich Na2CoFe (CN) 6-NC material with a cubic structure is prepared, and the sodium-rich Na2CoFe (CN) 6-NC material has excellent cycle performance and relatively high specific capacity.

Description

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Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCH01M4/366H01M10/054H01M4/58H01M4/62H01M4/625B82Y30/00H01M4/628H01M2004/028
Inventor 付争兵阮翔余佳阁杨雄皮玉强
Owner HUBEI ENG UNIV
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