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Method for preparing cathode material of tin - copper - nickel alloy in use for batteries

A negative electrode material and alloy negative electrode technology, which is applied in the field of preparation of tin-copper-nickel alloy negative electrode materials, can solve the problems of large irreversible capacity, large volume expansion rate, and large capacity attenuation, and achieve excellent discharge performance, simple preparation process, and low raw material cost. low effect

Inactive Publication Date: 2007-12-26
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These tin-based negative electrode materials still show a large volume expansion rate during the charge-discharge cycle, and the capacity decay is large, especially the irreversible capacity of the first cycle is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The adopted technical scheme consists of electroplating steps and vacuum treatment steps.

[0018] (1) Preparation of electroplating and electroplating solution (weight to volume ratio)

[0019] Disodium edetate 50g

[0020] Sodium Potassium Tartrate 10g

[0021] Potassium pyrophosphate 100g

[0022] Nickel sulfate 10g

[0023] Sodium stannate 10g

[0024] Distilled water 700mL

[0025] The acidity of the bath was adjusted to pH9 with concentrated ammonia water. Put the copper film in the plating solution with a temperature of 30°C, at 0.2A / dm 2 Electroplating for 30 minutes under the direct current of the negative cathode, the copper film electrode coated with tin-nickel alloy is prepared.

[0026] (2) vacuum treatment

[0027] The copper film electrode coated with tin-nickel alloy was placed in a vacuum drying oven, treated at 100° C. for 5 hours in a vacuum degree of 760 mm Hg, and kept for 24 hours. Naturally cooling to room temperature with the furnace tem...

Embodiment 2

[0029] The adopted technical scheme consists of electroplating steps and vacuum treatment steps.

[0030] (1) Preparation of electroplating and electroplating solution (weight to volume ratio)

[0031] Disodium edetate 85g

[0032] Sodium Potassium Tartrate 53g

[0033] Potassium pyrophosphate 250g

[0034] Nickel sulfate 55g

[0035] Sodium stannate 60g

[0036] Distilled water 800mL

[0037] Adjust the acidity of the plating solution to pH 12.5 with a NaOH solution with a concentration of 0.1 mol / L. Put the copper film in the plating solution with a temperature of 75°C, at 1.0A / dm 2 Electroplating was performed for 0.2 minutes under the direct current of the cathode, and a copper film electrode coated with a tin-nickel alloy was prepared.

[0038] (2) vacuum treatment

[0039] The copper film electrode coated with tin-nickel alloy was placed in a vacuum drying oven, treated at 180° C. for 1 hour in a vacuum degree of 760 mm Hg, and kept for 24 hours. Naturally cooli...

Embodiment 3

[0041] The adopted technical scheme consists of electroplating steps and vacuum treatment steps.

[0042] (1) Preparation of electroplating and electroplating solution (weight to volume ratio)

[0043] Disodium edetate 65g

[0044] Sodium Potassium Tartrate 35g

[0045] Potassium pyrophosphate 200g

[0046] Nickel sulfate 30g

[0047]Sodium stannate 35g

[0048] Distilled water 800mL

[0049] use CH 3 COONa saturated solution adjusts the acidity of the plating solution from 4 to pH11, and then places the copper film in the plating solution at a temperature of 50°C at 0.5A / dm 2 Electroplating for 10 minutes under the negative direct current of the cathode, the copper film electrode coated with tin-nickel alloy is prepared.

[0050] (2) vacuum treatment

[0051] The copper film electrode coated with tin-nickel alloy was placed in a vacuum drying oven, treated at 150° C. for 3 hours in a vacuum degree of 580 mm Hg, and kept for 24 hours. Naturally cooling to room tempera...

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Abstract

The technical scheme includes electroplating and vacuuming steps. Constituents of bath are: disodium calcium edetate, potassium sodium tartrate, potassium pyroborate, nickel sulphate, sodium stannate, and distilled water. Under condition of current density 0.2-1.0A / dm2, copper film electrode covered by tin nickel alloy is prepared after 0.2 -60min electroplating procedures. Vacuuming step includes procedures: placing copper film electrode covered by tin nickel alloy to vacuum drying oven; in vacuum degree 760-380mm mercury column, at 100-180 deg.C, processing 1 - 5h, and preserving heat for 24h. After cooling, cathode material of tin - copper - nickel alloy is prepared. The material possesses excellent discharge performance, and charging and discharging cyclical stability, and high first discharge capacity reached to 600mAh / g active matter. The disclosed cathode material is applicable to lithium ion battery, lithium battery, especially film type battery etc.

Description

technical field [0001] The invention relates to a preparation method of a tin-copper-nickel alloy negative electrode material used for batteries. technical background [0002] Lithium-ion batteries mostly use graphitized carbon anode materials. This material has a low discharge voltage platform, a specific capacity of 370mAh / g, good electrical conductivity, and has the advantages of no voltage hysteresis effect during charging and discharging. However, the charge-discharge capacity of carbon anode materials cannot meet the requirements of the rapidly developing mobile electronic devices for energy systems. The passivation (SEI) film formed during the first discharge process will cause a large irreversible capacity in the initial discharge, and it is more likely to decompose the protective layer at high temperature, resulting in battery failure or safety problems [Tang Zhiyuan, Wu Fei, Power Technology, 2006 , 30(2): 155-161]. In this case, people are constantly looking fo...

Claims

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Application Information

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IPC IPC(8): H01M4/29
CPCY02E60/124Y02E60/10
Inventor 童庆松黄熠施继成徐伟生瑜卢阳
Owner FUJIAN NORMAL UNIV
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