Preparation method of lithium titanate negative electrode material

A negative electrode material, lithium titanate technology, used in titanate, alkali metal titanate, chemical instruments and methods, etc., can solve the problems of wide particle size distribution, difficult control of product morphology, incomplete reaction, etc. High tap density, easy to realize industrialization, avoid the effect of agglomeration

Inactive Publication Date: 2015-03-04
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solid-phase method is relatively simple, but has inherent disadvantages, such as incomplete reaction, difficult control of product morphology, and wide particle size distribution.
The process of sol-gel method is relatively complicated, and agglomeration is easy to occur during the preparation process, and the required temperature is high. At the same time, the organic matter will produce a large amount of carbon dioxide gas during the sintering process.

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  • Preparation method of lithium titanate negative electrode material
  • Preparation method of lithium titanate negative electrode material
  • Preparation method of lithium titanate negative electrode material

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preparation example Construction

[0025] The present invention as figure 1 , 2 , 3, 4, a preparation method of lithium titanate negative electrode material is characterized in that: the specific preparation steps are as follows: (1) prepare an organic molecule solution, stir for 1-1.5h for use, and then according to the Li:Ti molar ratio (0.80—0.85): 1 Weigh the organic lithium source and titanium source, and add them to the organic molecule solution to be used respectively to obtain a titanium-containing solution and a lithium-containing solution; add the titanium-containing solution and the lithium-containing solution to the bottomed (2) After the precursor liquid is cooled to room temperature, the precipitate is separated by pressure filtration, and the precipitate is separated with ethanol and distilled water respectively. Wash and dry the precipitate in a vacuum oven at 80-120°C for 6-12 hours to obtain a lithium titanate precursor; press this precursor into a 0.5-1.5mm thick sheet in a muffle furnace at...

Embodiment 1

[0027]Example 1: (1) Weigh 0.2g of polyvinylpyrrolidone (PVP) and dissolve it in 35ml of ethanol, stir for 1.5h and set aside (2 parts are prepared at the same time). Then weigh 83.66g of lithium acetate and 340.32g of tetrabutyl titanate according to the Li:Ti molar ratio of 0.82:1, and add them to the previously prepared PVP ethanol solution, and then add the two solutions simultaneously to 60ml of distilled water. (2) After the precursor solution was cooled to room temperature, the precipitate was separated by pressure filtration, and washed with ethanol and distilled water respectively. The precipitate was dried in a vacuum oven at 90°C for 8 hours to obtain a lithium titanate precursor. The precursor was pressed into a 0.5mm-thick sheet and calcined in a muffle furnace at 850°C (introduced with nitrogen) for 12 hours, and then gas powdered after the furnace was cooled to room temperature and passed through a 300-mesh sieve to obtain a lithium titanate negative electrode m...

Embodiment 2

[0028] Example 2: (1) Weigh 0.2g of polyvinylpyrrolidone (PVP) and dissolve it in 35ml of ethanol, stir for 1.5h and set aside (2 parts are prepared at the same time). Then weigh 86.72g of lithium acetate and 340.32g of tetrabutyl titanate according to the molar ratio of Li:Ti of 0.85:1, and add them to the PVP ethanol solution prepared earlier, and then add the two solutions to 60ml of distilled water at the same time. Stirring at 60°C for 420 min in a stainless steel reactor with polytetrafluoroethylene lining to obtain a precursor solution containing flocculent precipitates; (2) After the precursor solution was cooled to room temperature, the precipitate was separated by pressure filtration. Wash with ethanol and distilled water respectively, and dry the precipitate in a vacuum oven at 110° C. for 6 hours to obtain a lithium titanate precursor. The precursor was pressed into a 0.8mm thick sheet and calcined in a muffle furnace at 950°C (introduced with nitrogen) for 10.5h, ...

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Abstract

The invention provides a preparation method of a lithium titanate negative electrode material. The preparation method comprises the specific steps of (1) preparing organic molecular solutions, stirring the solutions for later use, weighing an organic lithium source and a titanium source based on the mol ratio of Li to Ti of (0.80-0.85):1, respectively adding the weighed organic lithium source and titanium source to the organic molecular solutions to obtain a titanium-containing solution and a lithium-containing solution, simultaneously adding the titanium-containing solution and the lithium-containing solution to a reaction kettle containing a base solution, and stirring the solution to obtain a precursor solution containing flocculent precipitates; (2) after cooling the precursor solution to room temperature, separating out the precipitates in a filter pressing manner, washing the precipitates respectively with ethyl alcohol and distilled water, and drying the precipitates in a vacuum drying box to obtain a lithium titanate precursor; pressing the precursor into sheets with the thickness of 0.5-1.5 mm, burning the sheets in a muffle furnace, lowering the temperature of sheets to room temperature along with the temperature reducing of the furnace body, pneumatically pulverizing the sheets, and screening the pulverized sheets with a 300-mesh sieve to obtain the lithium titanate negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a preparation method of a lithium titanate negative electrode material. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery). It mainly relies on lithium ions to move between the positive and negative electrodes. It is a representative of modern high-performance batteries. Compared with traditional secondary batteries, lithium-ion battery energy High density, high average output voltage; small self-discharge, no memory effect; wide operating temperature range (-20°C ~ 60°C); excellent cycle performance, fast charge and discharge, high output power; no toxic and harmful substances. Therefore, it has been enthusiastically sought after by the market in recent years, and has become an ideal power source for portable tools such as mobile communication tools, notebook computers, and digital cameras, and it is also the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485C01G23/00
CPCC01G23/005H01M4/485Y02E60/10
Inventor 关成善宗继月孟博张海剑
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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