Lithium battery pole plate

A lithium battery and electrode technology, applied in the field of material science, can solve the problems of poor electrode conductivity, harsh reaction conditions, and complicated reaction process, and achieve the effects of large specific surface area, low cost, and simple process flow

Inactive Publication Date: 2014-03-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction process of these methods is cumbersome, the reaction conditions are relatively harsh, and the conductivity of the electrode is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The influence of embodiment 1 different silver nitrate concentrations on current collector

[0036] (1) Use water as a solvent to prepare a silver nitrate solution;

[0037] (2) Ultrasonic wash the copper sheet several times with deionized water and ethanol, and then let the copper sheet dry naturally;

[0038] (3) By the chemical bath method, immerse the copper sheet in the silver nitrate solution for a certain period of time, and then wash it several times with deionized water and ethanol.

[0039] Reaction conditions are as shown in table 1:

[0040] Table 1

[0041]

[0042] The result is as figure 1 As shown, when the concentration of silver nitrate was 2mM, sheet-like silver grew on the surface of the copper sheet, and the silver nanosheets were thinner. With the increase of the concentration of silver nitrate, the thickness of the silver nanosheets increased. When the concentration increased to 6mM, Obvious granular silver appeared on the surface of silver...

Embodiment 2

[0043] The influence of embodiment 2 different reaction times on current collector

[0044] The method is the same as in Example 1, and the reaction conditions are as shown in Table 2.

[0045] Table 2

[0046]

[0047] The result is as figure 2 As shown, when the concentration of silver nitrate is 4mM, as the reaction time increases, the silver nanosheets grown on the surface of the copper sheet increase and thicken. When the reaction is 60s, the surface of the silver nanosheets appears obvious granular silver.

Embodiment 3

[0048] The influence of embodiment 3 different reaction temperatures on current collector

[0049] The method is the same as in Example 1, and the reaction conditions are as shown in Table 3.

[0050] table 3

[0051]

[0052] Such as image 3 As shown, when the reaction temperature is high, the silver grown on the copper surface is granular, and as the reaction temperature gradually decreases, the silver grown on the copper surface gradually transitions to flakes, and when the temperature reaches a certain level, the silver grown on the copper surface is flaky.

[0053] To sum up, the concentration of silver nitrate, reaction time, and reaction temperature all have an impact on the morphology and structure of silver grown on the copper surface, among which the reaction temperature has the greatest impact.

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Abstract

The invention discloses a lithium battery pole plate including a current collector, and a preparation method of the current collector includes soaking a copper sheet in a silver nitrate solution for reaction at 10-40 DEG C, and after the reaction washing to obtain the current collector. According to the preparation method of the current collector, a chemical bath method is used for directly forming a certain nano structure on the surface of the copper sheet, the technology process is simple, the operation is easy, the cost is low, and a silver array structure formed on the surface of the copper sheet can effectively improve the performances of lithium ion battery electrode materials.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a lithium battery pole plate. Background technique [0002] With the rapid development of portable products, the consumption of various batteries has increased greatly. Lithium-ion batteries have received more and more attention because of their high energy density, green and pollution-free. However, many anode materials for lithium-ion batteries are faced with an important problem in the application, that is, the process of intercalation and extraction of lithium ions will be accompanied by huge volume changes, and the expansion and contraction of this volume will generate mechanical stress. The cycle performance declines rapidly. In addition, the performance of electrode materials is unstable under large charge and discharge currents, which limit the commercial application of lithium-ion battery anode materials. [0003] Existing studies have shown that arrayed elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66
CPCH01M4/13H01M4/661H01M4/667H01M4/70Y02E60/10
Inventor 杜宁赵文甲杨德仁
Owner ZHEJIANG UNIV
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