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Lithium titanate composite negative electrode material for lithium battery and preparation method of lithium titanate composite negative electrode material

A negative electrode material, lithium titanate technology, used in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as poor conductivity, and achieve the effects of improving electronic conductivity, reducing polarization, and reducing charge transfer resistance.

Inactive Publication Date: 2019-10-22
山东华亿比科新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since both C and Cu have high electrical conductivity, the C / Cu composite-coated Li prepared by the present invention 4 Ti 5 o 12 / C / Cu negative electrode material can solve the problem of poor conductivity of lithium titanate material and improve Li + Migration rate, reduce polarization, improve high rate charge and discharge performance, in order to solve the problems raised in the above background technology

Method used

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  • Lithium titanate composite negative electrode material for lithium battery and preparation method of lithium titanate composite negative electrode material
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  • Lithium titanate composite negative electrode material for lithium battery and preparation method of lithium titanate composite negative electrode material

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Embodiment 1

[0039] The invention provides the following technical solutions: a lithium titanate composite negative electrode material for lithium batteries, the raw materials of which are as follows in terms of mass parts: CMC: 0.003g, PEG400: 0.1156g, SBR: 0.006g, lithium acetate: 0.726g, nano-TiO 2 : 1g, sucrose: 0.1646g, copper sulfate: 0.2246g, the CMC is sodium carboxymethylcellulose, the PEG400 is polyethylene glycol 400 humectant solubilizer, the SBR is styrene-butadiene rubber, the acetic acid The concentration of lithium is greater than 5%, the weight percentage of the sucrose is 5 wt%, and the weight percentage of the copper sulfate is 5 wt%.

[0040] The present invention also provides a preparation method of a lithium titanate composite negative electrode material for a lithium battery, comprising the following steps:

[0041] S1: Dissolve CMC, PEG400 and SBR in 30ml deionized water respectively, and stir in an agate jar until the solution is uniform and clear;

[0042] S2: W...

Embodiment 2

[0050] The invention provides the following technical solutions: a lithium titanate composite negative electrode material for lithium batteries, the raw materials of which are as follows in terms of mass parts: CMC: 0.003g, PEG400: 0.1156g, SBR: 0.006g, lithium acetate: 0.726g, nano-TiO 2 : 1g, sucrose: 0.115g, the CMC is sodium carboxymethylcellulose, the PEG400 is a polyethylene glycol 400 humectant solubilizer, the SBR is styrene-butadiene rubber, and the concentration of lithium acetate is greater than 5%. , the weight percent of the sucrose is 5wt%.

[0051] The present invention also provides a preparation method of a lithium titanate composite negative electrode material for a lithium battery, comprising the following steps:

[0052] S1: Dissolve CMC, PEG400 and SBR in 30ml deionized water respectively, and stir in an agate jar until the solution is uniform and clear;

[0053] S2: Weigh lithium acetate and nano-TiO respectively 2 and sucrose are dissolved in the solut...

Embodiment 3

[0061] The invention provides the following technical solutions: a lithium titanate composite negative electrode material for lithium batteries, the raw materials of which are as follows in terms of mass parts: CMC: 0.003g, PEG400: 0.1156g, SBR: 0.006g, lithium acetate: 0.726g, nano-TiO 2 : 1g, the CMC is sodium carboxymethyl cellulose, the PEG400 is a polyethylene glycol 400 humectant solubilizer, the SBR is styrene-butadiene rubber, and the concentration of the lithium acetate is greater than 5%.

[0062] The present invention also provides a preparation method of a lithium titanate composite negative electrode material for a lithium battery, comprising the following steps:

[0063] S1: Dissolve CMC, PEG400 and SBR in 30ml deionized water respectively, and stir in an agate jar until the solution is uniform and clear;

[0064] S2: Weigh lithium acetate and nano-TiO respectively 2 Dissolve in the solution in step S1, and then ball mill in a ball mill for 2 hours to obtain a u...

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Abstract

The invention discloses a lithium titanate composite negative electrode material for a lithium battery. The lithium titanate composite negative electrode material is prepared from the following raw materials in parts by mass: 0.003 g of CMC, 0.1156 g of PEG, 400, 0.006 g of SBR, 0.726 g of lithium acetate, 1g of nano TiO2, 0.115-0.1646 g of cane sugar and 0.2246 g of copper sulfate. According to the invention, sucrose is used as a carbon source; copper sulfate is used as a copper source; the sucrose is pyrolyzed at high temperature to generate C; CuO generated by decomposition of copper sulfate can be directly reduced into Cu; C / Cu composite coating is synchronously completed on the surface of Li4Ti5O12; formation of a spherical porous stable structure can be promoted through combination of pore forming agents and adhesives; and spherical porous carbon-copper composite uniformly coated Li4Ti5O12 / C / Cu negative electrode material is prepared. Thus, the contact area between particles andthe contact area between the particles and the electrolyte are increased, the diffusion path of lithium ions is shortened, and the migration speed of the lithium ions is increased. Because C and Cu have relatively high conductivity, through the C / Cu composite coated Li4Ti5O12 / C / Cu negative electrode material prepared by the invention, the Li<+> migration rate is improved, polarization is reduced,and the high-rate charge-discharge performance is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium titanate composite negative electrode material for a lithium battery, and at the same time, the invention also relates to a preparation method for a lithium titanate composite negative electrode material for a lithium battery. Background technique [0002] Since the beginning of the 21st century, with the rapid development of the global economy, fossil fuels such as coal, oil and natural gas, which are the main energy sources, have been increasingly depleted, and environmental pollution has continued to intensify. To protect the natural environment and resources, realize the sustainable development of human beings, and develop new energy and renewable clean energy have become a top priority. Among many new energy technologies, power lithium-ion batteries are playing an increasingly important role in the national economy and daily life due to their advantag...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/625H01M4/626H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杨行李德亮周伟陈云鹏孙世界
Owner 山东华亿比科新能源股份有限公司
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