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Method for preparing negative electrode material lithium titanate of lithium ion battery through alternating voltage method

A lithium-ion battery, AC voltage technology, applied in battery electrodes, titanate, alkali metal titanate, etc., can solve the problem of poor high-power charging and discharging capacity of lithium titanate, and achieve excellent cycle performance and excellent high rate. Discharge performance, the effect of simple preparation process

Active Publication Date: 2014-04-16
成都云津能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the currently commercialized lithium titanate is prepared by the solid-phase method with larger particles of titanium dioxide as the precursor. The prepared lithium titanate needs to be screened in multiple steps, and the preparation process is quite complicated. Power charging and discharging ability is poor

Method used

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  • Method for preparing negative electrode material lithium titanate of lithium ion battery through alternating voltage method
  • Method for preparing negative electrode material lithium titanate of lithium ion battery through alternating voltage method
  • Method for preparing negative electrode material lithium titanate of lithium ion battery through alternating voltage method

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Embodiment 1

[0029] Such as figure 1 Shown, with 3mol / L NaNO 3 The solution is an electrolyte solution, using pure metal titanium wire as the cathode and anode, applying an AC voltage of 30V for 5 hours, and the metal titanium is dispersed into a titanium oxide nanoparticle sol with a particle size of less than 100nm, and then the titanium oxide sol is separated by suction filtration, and deionized Rinse six times with water, dry at 50°C, and Li 2 CO 3 Mix uniformly according to the molar ratio of lithium to titanium of 0.85, heat treatment at 800° C. for 15 hours in a tube furnace to obtain lithium titanate. From figure 2 And the XRD standard card JCPDS49-0207 shows that the synthesized lithium titanate is a pure phase without other impurities. TEM ( image 3 ) shows that the synthesized lithium titanate particle size is 50-70nm.

[0030] Lithium titanate powder, conductive agent acetylene black and binder PVDF (dissolved in N-methylpyrrolidone) are mixed and ground into a uniform ...

Embodiment 2

[0034] Such as figure 1 Shown, with 3mol / L NaNO 3 The solution is an electrolyte solution, using pure metal titanium wire as the cathode and anode, and applying an AC voltage of 60V for electrolysis for 2 hours (the reaction speed is faster than that of Example 1), the metal titanium is dispersed into a titanium oxide nanoparticle sol, and then the titanium oxide sol is separated by suction filtration , rinsed six times with deionized water, dried at 50 °C and combined with Li 2 CO 3 Mix uniformly according to the molar ratio of lithium to titanium of 0.85, heat treatment at 800° C. for 15 hours in a tube furnace to obtain lithium titanate. TEM ( Figure 7 ) showed that the synthesized lithium titanate was seriously agglomerated, with a particle size of about 30-65nm.

Embodiment 3

[0036]Using 3mol / L NaCl solution as the electrolyte solution, using pure metal titanium wire as the cathode and anode, and applying an AC voltage of 30V for 1 hour, the metal titanium is dispersed into a titanium oxide nanoparticle sol. Ultrasonic collection and cleaning, and other follow-up preparation process with embodiment 1. TEM ( Figure 8 ) shows that the synthesized lithium titanate has a particle size of 40-70nm and some agglomeration.

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Abstract

The invention discloses a method for preparing a negative electrode material lithium titanate of a lithium ion battery through an alternating voltage method. The method comprises the following steps: with a neutral salt solution as an electrolyte solution and pure metallic titanium as a cathode and an anode, applying alternating voltage of 10-220V, and dispersing the metallic titanium into titanium oxide nano-particle sol; and separating the titanium oxide sol, cleaning and drying, uniformly mixing with Li2CO3 according to a lithium-titanium molar ratio of 0.8-0.9, and performing heat treatment in a tube furnace at 700-900 DEG C for 3-24 hours, thus obtaining the lithium titanate. According to the synthetic lithium titanate provided by the invention, the metal lithium serves as a counter electrode for preparing a battery, the reversible capacity can reach 161mAh / g under the rate of 0.5 C, the capacity is 157mAh / g after 100 charge-discharge cycles, and the capacity retention rate is 97.5 percent. Moreover, the reversible capacity can reach 141mAh / g under the rate of 10 C, and the capacity can reach 127mAh / g after 100 charge-discharge cycles. The method is simple in preparation process, and the prepared lithium titanate has excellent cycle performance and high-rate discharge performance and can be widely applied to lithium ion batteries needed by various portable electronic equipment and various electric vehicles.

Description

technical field [0001] The invention relates to the field of new materials and lithium ion batteries, in particular to a preparation method of lithium titanate, a negative electrode material of lithium ion batteries, that is, the preparation of lithium titanate by an AC voltage method. Background technique [0002] The new lithium titanate (Li 4 Ti 5 o 12 ) The negative electrode material is a composite oxide composed of lithium metal and low potential transition metal titanium. As an anode material for lithium-ion batteries, Li 4 Ti 5 o 12 The biggest feature is its "zero strain". In the charge and discharge cycle, this "zero strain" can avoid the structural damage caused by the back and forth expansion and contraction of the electrode material, greatly improve the cycle performance and service life of the electrode, and have very good resistance to overcharge and overdischarge. Secondly, Li 4 Ti 5 o 12 The working potential of the battery is 1.55V relative to met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCY02E60/122C01G23/005H01M4/485Y02E60/10
Inventor 纪效波
Owner 成都云津能源科技有限公司
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