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Liquid phase synthesis method for submicron bismuth-carbon anode composite for secondary lithium ion batteries

A technology for lithium-ion batteries and carbon anode materials, which is applied in the field of liquid phase synthesis of submicron materials, can solve the problems of uneven particles and large particle size of synthetic materials, and achieve high purity, small particle size and good uniformity.

Active Publication Date: 2014-01-29
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrode material prepared by this method has improved the specific capacity and cycle performance of lithium-ion batteries, but this method has the disadvantages of inhomogeneous synthetic material particles and large particle size.

Method used

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  • Liquid phase synthesis method for submicron bismuth-carbon anode composite for secondary lithium ion batteries
  • Liquid phase synthesis method for submicron bismuth-carbon anode composite for secondary lithium ion batteries
  • Liquid phase synthesis method for submicron bismuth-carbon anode composite for secondary lithium ion batteries

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Embodiment 1

[0053] Embodiment 1: the liquid phase synthesis method of submicron bismuth-carbon negative electrode composite material of secondary lithium ion battery, its

[0054] It is characterized in that the steps of the synthetic method are as follows:

[0055] (a) Dissolve 5g of bismuth nitrate pentahydrate in 50mL of 2mol / L nitric acid, then add 2g of citric acid into the nitric acid, and stir until a uniform solution is formed;

[0056] (b) Put the above solution into a DU-20 type electric heating constant temperature oil bath box with an oil bath at 100°C until a pale yellow gelatinous substance is formed;

[0057] (c) Transfer the prepared pale yellow jelly substance to a KSL-1100X muffle furnace, raise the temperature to 500°C at a rate of 5°C / min, heat at this temperature for 4 hours, and obtain light yellow after natural cooling Bismuth oxide powder;

[0058] (d) Mix the prepared bismuth oxide powder with acetylene black at a mass ratio of 5.65:1 and grind them to make them...

Embodiment 2

[0060] Embodiment 2: the liquid phase synthesis method of submicron bismuth-carbon negative electrode composite material of secondary lithium ion battery, it is characterized in that the steps of this synthesis method are as follows:

[0061] (a) Dissolve 5g of bismuth nitrate pentahydrate in 50mL of 2mol / L nitric acid, then add 2g of citric acid into the nitric acid, and stir until a uniform solution is formed;

[0062] (b) Put the above solution into a DU-20 type electric heating constant temperature oil bath box with an oil bath at 100°C until a pale yellow gelatinous substance is formed;

[0063] (c) Transfer the prepared pale yellow jelly substance to a KSL-1100X muffle furnace, raise the temperature to 500°C at a rate of 5°C / min, heat at this temperature for 4 hours, and obtain light yellow after natural cooling Bismuth oxide powder;

[0064] (d) Mix the prepared bismuth oxide powder with acetylene black at a mass ratio of 5.65:1 and grind them to make them evenly mixed...

Embodiment 3

[0066] Embodiment 3: the liquid phase synthesis method of submicron bismuth-carbon negative electrode composite material of secondary lithium ion battery, it is characterized in that the steps of this synthesis method are as follows:

[0067] (a) Dissolve 5g of bismuth nitrate pentahydrate in 50mL of 2mol / L nitric acid, then add 2g of citric acid into the nitric acid, and stir until a uniform solution is formed;

[0068] (b) Put the above solution into a DU-20 type electric heating constant temperature oil bath box with an oil bath at 100°C until a pale yellow gelatinous substance is formed;

[0069] (c) Transfer the prepared pale yellow jelly substance to a KSL-1100X muffle furnace, raise the temperature to 500°C at a rate of 5°C / min, heat at this temperature for 5 hours, and obtain light yellow after natural cooling Bismuth oxide powder;

[0070] (d) Mix the prepared bismuth oxide powder with acetylene black at a mass ratio of 5.65:1 and grind them to make them evenly mixed...

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Abstract

The invention discloses a liquid phase synthesis method for a submicron bismuth-carbon anode composite for secondary lithium ion batteries. According to the synthesis method, by using a liquid phase method (sol-gel method), bismuth nitrate is hydrolyzed so as to generate oxidized bismuth gel, the oxidized bismuth gel is subjected to high temperature calcination so as to obtain powdered submicron bismuth oxide, and the powdered bismuth oxide and acetylene blacks are uniformly mixed, and then the obtained mixture is calcined in an argon-hydrogen (5% hydrogen) atmosphere, so that the submicron bismuth-carbon anode composite for secondary lithium ion batteries can be obtained. The bismuth-carbon anode composite prepared by using the method disclosed by the invention has the characteristics of good uniformity, small size, and high electrochemical performance.

Description

[0001] 1. Technical field [0002] The invention relates to a liquid-phase synthesis of a submicron material, in particular to a liquid phase synthesis of a submicron bismuth-carbon negative electrode composite material for a secondary lithium ion battery with good uniformity, small particle size and high electrochemical performance. phase synthesis method. 2. Background technology [0003] At present, the main problem with bismuth as a negative electrode is that when lithium is intercalated to form Li 3 After Bi, a volume expansion of 210% will occur. During the charge-discharge cycle, the negative electrode expands (during lithium intercalation) and shrinks (during delithiation) causing the material to rupture. This rupture allows the active material to no longer make electrical contact with the rest of the electrode, resulting in no real voltage for the battery to recharge or discharge. [0004] Some experimental studies have obtained a method to reduce the vol...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCH01M4/362H01M4/38H01M4/625Y02E60/10
Inventor 何平杨思勰周豪慎蒋颉赵世勇
Owner NANJING UNIV
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