Preparation method of in-situ carbon conductive agent-coated tin-nickel alloy and application of in-situ carbon conductive agent-coated tin-nickel alloy as cathode material for sodium-ion battery

A tin-nickel alloy, in-situ coating technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problem of failure to fully utilize the buffering and conductive effects of carbon conductive agents, and the difficulty in achieving uniform distribution of active materials and carbon conductive agents and other issues to achieve the effect of improving structural stability

Inactive Publication Date: 2016-07-06
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This ex-situ preparation process is difficult to achieve uniform distribution of active materials and carbon conductive agents on the nanoscale, and fails to fully utilize the buffering and conduct

Method used

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  • Preparation method of in-situ carbon conductive agent-coated tin-nickel alloy and application of in-situ carbon conductive agent-coated tin-nickel alloy as cathode material for sodium-ion battery
  • Preparation method of in-situ carbon conductive agent-coated tin-nickel alloy and application of in-situ carbon conductive agent-coated tin-nickel alloy as cathode material for sodium-ion battery
  • Preparation method of in-situ carbon conductive agent-coated tin-nickel alloy and application of in-situ carbon conductive agent-coated tin-nickel alloy as cathode material for sodium-ion battery

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Experimental program
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Embodiment 1

[0026] (1) tin tetrachloride and potassium nickel cyanide are dissolved in the aqueous solution of the carbon black conductive agent that is dispersed mass concentration respectively at 10 mg / ml, and form concentration is 0.2 mol / liter of tin tetrachloride and 0.2 mol / ml The aqueous solution of potassium nickel cyanide of 1 liter; then the aqueous solution of tin tetrachloride and potassium nickel cyanide is mixed to form the Sn(IV)–Ni(II) cyano coordination polymer hydraulic coagulation of in-situ fixed carbon black conductive agent Glue; Wherein, the molar ratio of tin tetrachloride and potassium nickel cyanide is 1:1.

[0027] (2) The Sn(IV)-Ni(II) cyano coordination polymer hydrogel of the in-situ fixed carbon black conductive agent obtained in step (1) is used as a precursor, and sodium borohydride is added therein as a reducing agent, The molar ratio of sodium borohydride to tin tetrachloride is 20:1, react for 1 hour, wash and dry the product, and obtain a tin-nickel al...

Embodiment 2

[0030] (1) tin tetrachloride and potassium nickel cyanide are dissolved in the aqueous solution of the carbon black conductive agent that disperses mass concentration respectively in 1 mg / ml, form the tin tetrachloride that concentration is 0.1 mol / liter and 1 mol / ml The aqueous solution of potassium nickel cyanide of 1 liter; then the aqueous solution of tin tetrachloride and potassium nickel cyanide is mixed to form the Sn(IV)–Ni(II) cyano coordination polymer hydraulic coagulation of in-situ fixed carbon black conductive agent Glue; Wherein, the molar ratio of tin tetrachloride and potassium nickel cyanide is 0.1:1.

[0031] (2) The Sn(IV)-Ni(II) cyano coordination polymer hydrogel of the in-situ fixed carbon black conductive agent obtained in step (1) is used as a precursor, and sodium borohydride is added therein as a reducing agent, The molar ratio of sodium borohydride to tin tetrachloride is 100:1, react for 24 hours, wash and dry the product, and obtain a tin-nickel a...

Embodiment 3

[0034] (1) dissolving tin tetrachloride and potassium nickel cyanide in the aqueous solution of the carbon black conductive agent that dispersed mass concentration is 100 mg / ml respectively, forming concentration is 5 mol / liter of tin tetrachloride and 0.5 mol / ml The aqueous solution of potassium nickel cyanide of 1 liter; then the aqueous solution of tin tetrachloride and potassium nickel cyanide is mixed to form the Sn(IV)–Ni(II) cyano coordination polymer hydraulic coagulation of in-situ fixed carbon black conductive agent Glue; Wherein, the molar ratio of tin tetrachloride and potassium nickel cyanide is 10:1.

[0035] (2) The Sn(IV)-Ni(II) cyano coordination polymer hydrogel of the in-situ fixed carbon black conductive agent obtained in step (1) is used as a precursor, and sodium borohydride is added therein as a reducing agent, The molar ratio of sodium borohydride to tin tetrachloride is 1:1, react for 0.1 hour, wash and dry the product, and obtain a tin-nickel alloy co...

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Abstract

The invention discloses a preparation method of an in-situ carbon conductive agent-coated tin-nickel alloy and an application of the in-situ carbon conductive agent-coated tin-nickel alloy as a cathode material for a sodium-ion battery. The method comprises the following steps: respectively dissolving stannic chloride and nickel potassium cyanide into water solutions into which a carbon conductive agent is dispersed, and then mixing the water solutions of the stannic chloride and the nickel potassium cyanide to form Sn(IV)-Ni(II) cyano coordination polymer hydrogel of the in-situ immobilized carbon conductive agent; and with a composite hydrogel system as a precursor, adding sodium borohydride as a reducing agent, reacting for 0.1-24 hours, and washing and drying a product to obtain the in-situ carbon conductive agent-coated tin-nickel alloy. The carbon conductive agent is coated with the tin-nickel alloy in situ in the composite hydrogel reduction process; and uniform distribution of the carbon conductive agent and tin-nickel alloy active materials at the nanoscale can be achieved, so that the structure stability and the charge transport capacity of the tin-nickel alloy as the cathode material for the sodium-ion battery are effectively improved.

Description

technical field [0001] The invention relates to a negative electrode material of a sodium ion battery, in particular to a preparation method of a tin-nickel alloy coated with a carbon conductive agent in situ, and the application of the composite material to a negative electrode material of a sodium ion battery, showing good performance Sodium storage performance, such as better cycle stability, higher specific capacity and rate characteristics. Background technique [0002] Main group metal elements such as tin (Sn), antimony (Sb) and germanium (Ge) have an alloy-type sodium storage mechanism, which can show good safety and high specific capacity as anode materials for sodium-ion batteries. Among them, each tin atom can intercalate up to 3.75 sodium ions to form Na 15 sn 4 Intercalated sodium phase, the corresponding theoretical specific capacity is as high as 847mAhg -1 . Therefore, tin-based materials are considered to be one of the ideal choices for anode materials f...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/366H01M4/387H01M4/625H01M10/054Y02E60/10
Inventor 吴平张炜钰张安萍于梓洹周益明唐亚文
Owner NANJING NORMAL UNIVERSITY
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