a doped na + The preparation method of nano lithium titanate

A technology of nano-lithium titanate and solution, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems affecting battery performance, poor conductivity, easy enrichment of electrons, etc., and achieve stable cycle performance, high charge-discharge specific capacity, and the effect of improving electrochemical performance

Inactive Publication Date: 2017-12-15
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But spinel Li 4 Ti 5 o 12 There is a problem with the use of anode materials for lithium-ion batteries-since Li 4 Ti 5 o 12 is an intrinsic conductivity of only 10 -9 S / cm insulating material, so the conductivity is extremely poor, resulting in easy enrichment of electrons under high-rate discharge conditions, resulting in electrode polarization and limiting the insertion and extraction of lithium ions, which ultimately affects the performance of the battery.

Method used

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  • a doped na <sup>+</sup> The preparation method of nano lithium titanate
  • a doped na <sup>+</sup> The preparation method of nano lithium titanate
  • a doped na <sup>+</sup> The preparation method of nano lithium titanate

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Embodiment 1

[0037] This embodiment relates to a doped Na + The preparation method of the nano-lithium titanate, specifically as follows:

[0038] Step 1, 2 mL of polyethylene glycol octylphenyl ether (chemically pure) and 2 mL of n-hexanol (analytical pure) are premixed to form a mixed solution, and then an appropriate amount of deionized water is added to form a 64 mL dissolving agent;

[0039] Step 2, the dissolving agent is magnetically stirred at room temperature until the solution is clear and uniform to obtain solution A;

[0040] Step 3, according to the molar ratio Li:Na=3.98:0.02, get 0.4969g lithium carbonate (analytical pure, pre-ground into fine powder) and 0.00358g sodium carbonate (analytical pure) to mix, add 2mL deionized water and shake up, get Solution B;

[0041]Step 4: Pour solution B into a uniformly mixed solution (solution A) of polyethylene glycol octylphenyl ether and n-hexanol, and magnetically stir in a constant temperature water bath for 20 minutes to obtain ...

Embodiment 2

[0048] This embodiment relates to a doped Na + The preparation method of the nano-lithium titanate, specifically as follows:

[0049] Step 1, 4 mL of polyethylene glycol octylphenyl ether (chemically pure) and 2 mL of n-hexanol (analytical pure) are premixed to form a mixed solution, and then an appropriate amount of deionized water is added to form a 66 mL dissolving agent;

[0050] Step 2, the dissolving agent is magnetically stirred at room temperature until the solution is clear and uniform to obtain solution A;

[0051] Step 3, according to the molar ratio Li:Na=3.95:0.05, get 0.4932g lithium carbonate (analytical pure, pre-ground into fine powder) and 0.00896g sodium carbonate (analytical pure) to mix, add 2mL deionized water and shake up, get Solution B;

[0052] Step 4: Pour solution B into a homogeneously mixed solution of polyethylene glycol octylphenyl ether and n-hexanol, and magnetically stir in a constant temperature water bath for 20 minutes to obtain a unifor...

Embodiment 3

[0059] This embodiment relates to a doped Na + The preparation method of the nano-lithium titanate, specifically as follows:

[0060] Step 1, 6 mL of polyethylene glycol octylphenyl ether (chemically pure) and 2 mL of n-hexanol (analytical pure) are premixed to form a mixed solution, and then an appropriate amount of deionized water is added to form a 68 mL dissolving agent;

[0061] Step 2, the dissolving agent is magnetically stirred at room temperature until the solution is clear and uniform to obtain solution A;

[0062] Step 3, according to the molar ratio Li:Na=3.92:0.08, get 0.4894g lithium carbonate (analytical pure, pre-ground into fine powder) and 0.0143g sodium carbonate (analytical pure) to mix, add 2mL deionized water and shake up, get Solution B;

[0063] Step 4: Pour solution B into a homogeneously mixed solution of polyethylene glycol octylphenyl ether and n-hexanol, and magnetically stir in a constant temperature water bath for 20 minutes to obtain a uniform...

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Abstract

The invention provides a preparation method of Na<+>-doped nano-lithium titanate. A LixNa4-XTi5O12 anode material is obtained through a microemulsion reaction of a polyoxyethylene octyl phenyl ether / n-hexanol / cyclohexane microemulsion system and doping of sodium ions. The prepared Na-doped lithium titanate particles have a good dispersion effect, particle aggregation is improved remarkably, and particle size can be better controlled. The prepared LixNa4-XTi5O12 has high charge and discharge specific capacity and stable cycle performance. Under the condition of room temperature, initial discharge capacity at 0.5 C multiplying power reaches 177 mAh / g, close to theoretical capacity. The discharge capacity at 10 C multiplying power also reaches more than 90mAh / g, and the LixNa4-XTi5O12 has stable cycle performance. The Na<+>-doped nano-lithium titanate has a wide application prospect in the fields of civil portable electronic equipment and power equipment.

Description

technical field [0001] The invention relates to a preparation method of lithium titanate doped with sodium, a lithium ion secondary battery negative electrode material, in particular to a doped Na + The preparation method of nano lithium titanate. Background technique [0002] At present, lithium-ion batteries occupy the largest market share of rechargeable batteries, and are widely used in civilian portable electronic devices such as mobile phones, notebook computers, and MP3 players. In recent years, people have gradually applied them to power equipment. Hybrid vehicles have also entered the market. The negative electrode materials used in commercially available lithium-ion batteries are mostly carbon materials, but it has a fatal problem, that is, when the battery is charged quickly or overcharged, metal lithium may be precipitated on the surface of the electrode material, and dendrites may form to cause a short circuit. This will not only reduce the service life of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525
CPCB82Y30/00H01M4/485H01M4/626H01M10/0525Y02E60/10
Inventor 何丹农郭元张春明姚露露郭松涛宁子杨黄昭贺旷驰
Owner SHANGHAI JIAO TONG UNIV
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