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Ti<3+>/Ti<4+> mixed-valence lithium titanate negative electrode material doped with iron element and preparation of negative electrode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity, poor performance and serious discharge polarization of lithium titanate materials, and achieves low cost and good crystallization. , the effect of increasing the discharge capacity

Inactive Publication Date: 2016-07-27
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lithium titanate material has poor conductivity, and the high current discharge polarization is relatively serious, so the performance at high rates is not good.

Method used

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  • Ti&lt;3+&gt;/Ti&lt;4+&gt; mixed-valence lithium titanate negative electrode material doped with iron element and preparation of negative electrode material
  • Ti&lt;3+&gt;/Ti&lt;4+&gt; mixed-valence lithium titanate negative electrode material doped with iron element and preparation of negative electrode material
  • Ti&lt;3+&gt;/Ti&lt;4+&gt; mixed-valence lithium titanate negative electrode material doped with iron element and preparation of negative electrode material

Examples

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Effect test

Embodiment 1

[0025] A kind of Ti 3+ / Ti 4+ A method for preparing a lithium titanate negative electrode material for a lithium ion battery doped with iron elements in a mixed valence state, comprising the following steps:

[0026] (1) Place 2mol of lithium carbonate, 5mol of titanium dioxide and 0.1% of the total mass of reduced iron powder in a planetary ball mill, and grind for 6-10h under the protection of an inert atmosphere;

[0027] (2) Place the mixture obtained in step (1) in a tubular atmosphere furnace, protected by high-purity argon, and sinter at 800°C for 10 hours, and naturally cool to room temperature to obtain Ti 3+ / Ti 4+ mixed valence Li 4 Ti 5-x Fe x o 12-y , where 0<x<0.1, 0.01<y<0.5.

[0028] The synthesized samples were made into pole pieces and assembled into simulated batteries.

[0029] The specific operation is as follows: According to the mass ratio, active material: acetylene black (C): PVDF=80:10:10 ratio weighing, fully grinding and stirring, adding an...

Embodiment 2

[0031] Same as Example 1, the difference is:

[0032] The amount of iron powder accounts for 2% of the total mass.

Embodiment 3

[0034] Same as Example 1, the difference is:

[0035] The amount of iron powder accounts for 3% of the total mass.

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Abstract

The invention relates and provides a Ti<3+> / Ti<4+> mixed-valence lithium titanate negative electrode material doped with an iron element and a preparation of the negative electrode material. The chemical formula of the negative electrode material is Li<4>Ti<5-x>Fe<x>O<12-y>, wherein x is more than 0 but less than 1, and y is more than 0.01 but less than 0.5. A solid phase synthesis method is adopted, iron powder is taken as a reducing agent and a doping agent, the Ti<3+> / Ti<4+> mixed-valence lithium titanate negative electrode material doped with iron ions is prepared by a one-step solid phase method under the protection of an inertia gas, and a part of Ti<4+> is reduced to Ti<3+> by the reducing agent. The conductivity of an electrode is improved due to mixed valence generated by spinelle material lithium titanate, thus, the charge impedance is reduced, and the polarization of the electrode is reduced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a Ti 3+ / Ti 4+ A lithium titanate negative electrode material for a lithium ion battery doped with iron elements in a mixed valence state and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of various portable electronic products and the electric vehicle industry, we urgently need a power supply system with high specific capacity, high charge and discharge efficiency, long cycle life and green environmental protection to match it. Lithium-ion batteries are considered to be the most ideal power supply because of their advantages such as high open circuit voltage, high energy density, long cycle life, no memory effect, less pollution, and low self-discharge rate. Anode materials are an important part of lithium-ion batteries. The performance of anode materials is directly related to the performance of lithium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/626H01M10/0525Y02E60/10
Inventor 张灵志杨贵钧杨建文
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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