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Preparation method for laminated sheet-shaped morphological lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problem that the electrochemical performance does not meet the expected ideal, the composite material is disorderly, and the ionic conductivity of the composite material is affected. To achieve the effect of shortening lithium ion channels, improving electrochemical performance, and realizing commercialization

Inactive Publication Date: 2017-07-07
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently synthesized LTO / rutitle-TiO 2 The morphology of composite materials is mostly chaotic fragments or granular
Disorganized fragment morphology affects LTO / rutitle-TiO 2 The ionic conductivity of the composite makes LTO / rutitle-TiO 2 The electrochemical performance of this composite material is not as ideal as expected

Method used

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  • Preparation method for laminated sheet-shaped morphological lithium ion battery negative electrode material
  • Preparation method for laminated sheet-shaped morphological lithium ion battery negative electrode material
  • Preparation method for laminated sheet-shaped morphological lithium ion battery negative electrode material

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preparation example Construction

[0020] The present invention will be further explained below in conjunction with specific embodiments, but it is not intended to limit the protection scope of the present invention. In order to solve the influence of the morphology of the negative electrode material of the lithium ion battery on its electrochemical properties in the past, this embodiment provides a lithium ion battery negative electrode material Li 4 Ti 5 o 12 / rutile-TiO 2 A preparation method comprising the steps of:

[0021] 1) At room temperature, CH 3 COOLi·2H 2 O. Sodium lauryl sulfate is placed in ethanol, after fully stirring and mixing, add titanium oxysulfate, and react under dry conditions for 10-12 hours to obtain a reaction solution;

[0022] 2) Add deionized water to the reaction solution, stir for 1-2min to obtain a milky white solution, move the milky white solution to a reaction kettle, react at 170-180°C for 36-40h, centrifuge, collect the precipitate, and wash with ethanol , vacuum dry...

Embodiment 1

[0027] Example 1 A stacked sheet-like morphology lithium-ion battery negative electrode material Li 4 Ti 5 o 12 / rutile-TiO 2

[0028] Follow the steps below to prepare:

[0029] 1) At room temperature, 0.170gCH 3 COOLi·2H 2 O, 0.390g sodium lauryl sulfate is placed in 26ml ethanol, after magnetic stirring is fully mixed, add titanyl sulfate drop by drop, under dry condition, react 10-12h, obtain reaction solution, and CH 3 COOLi·2H 2 O and titanium oxysulfate carry out batching according to the ratio that molar ratio is Li / Ti=4:5~5.5;

[0030] 2) Add 25-30ml of deionized water to the reaction solution, stir vigorously for 1-2min to obtain a milky white solution, move the milky white solution to the reaction kettle, react at 170-180°C for 36-40h, centrifuge, and collect the powder at the bottom of the reaction kettle Precipitate, wash with ethanol for 4-6 times, and dry in vacuum at 70-80°C for 6-8 hours to obtain the product precursor;

[0031] 3) The product precurs...

Embodiment 2

[0032] Example 2 A negative electrode material for lithium-ion batteries with a stacked sheet shape Li 4 Ti 5 o 12 / rutile-TiO 2

[0033] Follow the steps below to prepare:

[0034] 1) with embodiment 1.

[0035] 2) with embodiment 1.

[0036] 3) The product precursor is placed in the air atmosphere, calcined in a muffle furnace at a high temperature of 590-600° C. for 6-7 hours, cooled naturally to room temperature, and ground to obtain the target product.

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Abstract

The invention discloses a preparation method for a laminated sheet-shaped morphological lithium ion battery negative electrode material Li<4>Ti<5>O<12> / rutile-TiO<2>. The preparation method comprises the steps of 1) placing CH<3>COOLi.2H<2>O and sodium lauryl sulfate in ethanol, stirring and mixing the CH<3>COOLi.2H<2>O and the sodium lauryl sulfate, adding titanyl sulfate, and performing reaction under a drying condition to obtain a reaction liquid; 2) adding deionized water into the reaction liquid, performing stirring to obtain a milky white solution, transferring the milky white solution to a reaction kettle, performing reaction for 36-40 hours at 170-180 DEG C, and performing centrifugal separation, sediment collection, ethanol washing and vacuum drying to obtain a product precursor; and 3) placing the product precursor in an air atmosphere, performing calcination for 6-7 hours at 490-700 DEG C, and performing natural cooling to a room temperature and grinding to obtain a target product. By the preparation method, the problem of a potential risk of a lithium-intercalation carbon material is solved; and by a lamination structure, the ion conductivity is improved, the electrochemical performance of the material is improved, and the new generation of the lithium ion battery negative electrode material is pushed.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode material Li 4 Ti 5 o 12 / rutile-TiO 2 and its preparation method. Background technique [0002] At present, most of the commercial lithium-ion battery anode materials are lithium-intercalated carbon materials, but when the battery is overcharged or the temperature is too high, there are considerable safety hazards. The problem of new materials for electrodes is imminent. Spinel Li 4 Ti 5 o 12 (LTO) has become a research hotspot due to its "zero strain" structure and high lithium intercalation potential (1.55V, VS Li / Li+), which not only has good cycle performance, but also has good safety performance. However, the low conductivity of this material (<10 -13 S cm -1 ) limits its application. [0003] So far, a variety of methods to improve the rate performance of LTO have been reported, such as: bulk phase doping,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M10/42H01M10/0525
CPCH01M4/362H01M4/485H01M10/0525H01M10/4235Y02E60/10
Inventor 葛昊王登虎聂胜楠崔潞霞宋溪明
Owner LIAONING UNIVERSITY