Lithium ion battery having high initial coulombic efficiency

A lithium-ion battery and Coulomb efficiency technology, applied in the field of lithium-ion battery preparation, can solve the problems of reduced battery capacity, reduced actual utilization rate of positive electrode materials, low first charge and discharge efficiency of lithium batteries, etc., and achieves high capacity and cycle performance. stable effect

Inactive Publication Date: 2017-05-31
ZHONGTIAN ENERGY STORAGE TECH
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  • Summary
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  • Description
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Problems solved by technology

However, because part of the lithium deintercalated from the positive electrode material during the first charge and discharge is consumed in the formation of the SEI film on the surface of the negative electrode, this part of lithium cannot return to the positive electrode material during the subsequent discharge process, which makes the initial charge and discharge efficiency of the lithium battery low. , the actual utilization rate of the positive electrode material is reduced, and the battery capacity is reduced

Method used

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  • Lithium ion battery having high initial coulombic efficiency
  • Lithium ion battery having high initial coulombic efficiency

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preparation example Construction

[0020] A method for preparing a lithium-ion battery with high initial Coulombic efficiency. The positive electrode active material and the negative electrode active material go through the processes of batching, coating, roll cutting, baking, die cutting, winding, assembly and liquid injection to complete the high-efficiency battery. The preparation of lithium-ion batteries with Coulombic efficiency for the first time, the negative electrode active material is made of artificial graphite material, and the negative electrode active material is modified by lithium doping through the steps of preparing solution, mixing active material and heating and drying. The specific steps are as follows:

[0021] (1) Prepare solution: add lithium source to distilled water to prepare lithium source solution, the mass fraction of lithium source is 14-16%;

[0022] (2) Mixing active substances: Add artificial graphite materials to the lithium source solution prepared in step (1), and then stir u...

Embodiment 1

[0028] A kind of preparation method of the lithium-ion battery of high coulombic efficiency for the first time, comprises the following steps:

[0029] Positive electrode sheet preparation: the positive electrode sheet uses nickel-cobalt lithium manganese oxide ternary material as the positive electrode active material, polyvinylidene fluoride as the binder, Ketjen black as the conductive agent, and N-methylpyrrolidone as the solvent to prepare the positive electrode slurry . Then, the positive electrode slurry is prepared into a positive electrode sheet suitable for winding 2714897 battery cores through processes such as coating, roll cutting, baking, and die cutting.

[0030] Lithium-doped modification of the negative electrode material: prepare a LiOH solution with a mass fraction of 14%, and the solvent is distilled water. Add the weighed artificial graphite into the lithium source solution to ensure that the mass ratio of the artificial graphite material to the lithium s...

Embodiment 2

[0034] A kind of preparation method of the lithium-ion battery of high coulombic efficiency for the first time, comprises the following steps:

[0035] Positive electrode sheet preparation: the positive electrode sheet uses nickel-cobalt lithium manganese oxide ternary material as the positive electrode active material, polyvinylidene fluoride as the binder, Ketjen black as the conductive agent, and N-methylpyrrolidone as the solvent to prepare the positive electrode slurry . Then, the positive electrode slurry is prepared into a positive electrode sheet suitable for winding 2714897 battery cores through processes such as coating, roll cutting, baking, and die cutting.

[0036] Lithium-doped modification of the negative electrode material: prepare a LiOH solution with a mass fraction of 16%, and the solvent is distilled water. Add the weighed artificial graphite into the lithium source solution to ensure that the mass ratio of the artificial graphite material to the lithium s...

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Abstract

The invention discloses a preparation method of a lithium ion battery having high initial coulombic efficiency. The lithium ion battery having high initial coulombic efficiency is prepared through the following working procedures: proportioning a positive pole active substance and a negative pole active substance, coating, rolling, slitting, baking, die-cutting, coiling, assembling and injecting, wherein the negative pole active substance is an artificial graphite material; and the negative pole active substance is subjected to lithium-doped modification treatment through the steps of solution preparation, active substance mixing, heating and drying. According to the invention, the negative pole active substance is subjected to lithium-doped modification treatment, and the lithium ion battery having high initial charge / discharge efficiency is provided. The positive pole material is not definitely restricted in the invention, thereby widening the application range. The lithium ion battery disclosed by the invention has the advantages of high capacity, stable cycle performance and high initial coulombic efficiency.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery preparation and power batteries, and in particular relates to a preparation method of a lithium-ion battery with high first coulombic efficiency. Background technique [0002] In recent years, the development and research of new secondary batteries have attracted people's attention. Among them, lithium-ion batteries have become a research hotspot due to their advantages such as high specific energy, good charge and discharge performance, small self-discharge, long cycle life, and environmental protection. And developed quite rapidly. [0003] In lithium-ion batteries, the battery capacity is generally determined by the capacity of the positive electrode active material, and the capacity of the negative electrode is excessive. However, because part of the lithium deintercalated from the positive electrode material during the first charge and discharge is consumed in the formation of the SEI film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0587H01M4/1393
CPCH01M4/1393H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 姚林林杨伟吕林李文生薛驰徐洲
Owner ZHONGTIAN ENERGY STORAGE TECH
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