Lithium ion battery and preparation method thereof

A lithium-ion battery and electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor battery stability, fast capacity decay, and poor cycle performance

Inactive Publication Date: 2011-05-11
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is in order to overcome the xLi that existing use capacity is higher 2 MnO 3 ·yLiMO 2 The stability

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0019] The present invention simultaneously provides the preparation method of above-mentioned lithium ion battery, and the steps comprise:

[0020] Preparation of positive electrode sheet: electrolytically activate the positive electrode active material precursor to prepare the positive electrode active material, add the positive electrode active material and materials including conductive agent and binder into the solvent and mix to prepare the positive electrode slurry, and then coat the obtained positive electrode slurry Covering the positive electrode collector on the positive electrode sheet;

[0021] Or mix the material including the conductive agent and the binder with the positive electrode active material precursor to obtain a mixture, electrolytically activate the mixture and add it to the solvent to prepare the positive electrode slurry, and then apply the obtained positive electrode slurry on the positive electrode current collector to prepare the positive electrod...

Embodiment 1

[0035] (1) Preparation of positive electrode active material

[0036] 63.42gNi can be 2 (OH) 2 CO 3 , 206.90g MnCO 3 and 133.00g Li 2 CO 3 Mix well, and then add absolute ethanol to the mixture for high-efficiency ball milling. After the ball-milled raw materials are fully dried, they are pre-sintered at 450° C. to prepare the precursor. The precursor is compacted and sintered at a high temperature of 980°C to prepare the average particle size D 50 1.15μm, tap density 1.7g / cm 3 0.5Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 Composite solid solution.

[0037] 150.0g0.5Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 The composite solid solution is placed in a barrel prepared by copper mesh, and placed in an electrolysis device. The counter electrode is a Cu sheet, and the electrolytic medium is 1moL / L LiPF6-EC+DEC+EMC electrolyte. The two electrodes are electrolyzed at 4.6V, and the initial current When the current is less than 0.1mA, the electrolysis is stopped to obtain a positive ...

Embodiment 2

[0043] The positive electrode active material and the battery were prepared by the same method as in Example 1, except that the electrolysis voltage was 4.8V.

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Abstract

The invention provides a battery and a preparation method thereof. The battery comprises an anode, a cathode and a diaphragm arranged between the anode and the cathode, wherein the anode comprises an anode collector and an anode active substance coated on the anode collector; the anode active substance is a substance prepared by electrolytic activation of an anode active substance precursor outside the lithium ion battery; and the anode active substance precursor has the formula of xLi2MnO3.yLiMO2, wherein x is more than 0 and less than 1; the y is equal to 1-x; M is one or more kinds of metal ions; and Li2MnO3 and LiMO2 have a layer structure respectively. The battery prepared by the method has high capacity, high stability and excellent cycle performance and accords with the developmentof the prior art.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are more and more widely used in portable electronic products such as mobile phones and digital cameras due to their advantages of high energy and no pollution. They are also used as backup energy for large-scale equipment such as automobiles and space stations. , the requirements for its various performances are also constantly increasing. [0003] In particular, the development and improvement of active materials is the focus and difficulty of existing technology research. The existing widely used positive electrode active materials generally include LiCoO 2 Such as Co-based active materials, but Co is toxic and causes some pollution to the environment. At the same time, with the consumption of resources, the price is becoming more and more expensive, and LiCoO 2 When Li ions are extracted, the structure is Li 1-x Co...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/52H01M4/50H01M4/1391H01M4/64
CPCY02E60/10
Inventor 李昕洋徐茶清
Owner SHANGHAI BYD
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