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Positive electrode material, positive electrode, preparation method of positive electrode, and lithium secondary battery

A positive electrode material and positive electrode technology, applied in the field of lithium secondary batteries, can solve problems such as poor safety, achieve the effects of reducing impedance and temperature rise, good application prospects, and good electrical conductivity

Inactive Publication Date: 2021-02-05
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a positive electrode material, a positive electrode and its preparation method, and a lithium secondary battery, aiming at solving the technical problem of poor safety existing in the existing lithium secondary battery

Method used

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  • Positive electrode material, positive electrode, preparation method of positive electrode, and lithium secondary battery
  • Positive electrode material, positive electrode, preparation method of positive electrode, and lithium secondary battery

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preparation example Construction

[0039] Correspondingly, the embodiment of the present invention also provides a method for preparing a positive electrode, which includes the following steps:

[0040] S1. Provide positive electrode materials;

[0041] S2. Providing a positive electrode collector, coating the positive electrode material on the surface of the positive electrode collector, and performing heat treatment to obtain a positive electrode.

[0042] The preparation method of the positive electrode provided by the embodiment of the present invention is simple and easy, and the preparation process is easy to control, which is beneficial to realize large-scale production.

[0043] Specifically, in S1, the positive electrode material is the above-mentioned positive electrode material provided by the embodiment of the present invention, including positive electrode active material, binder, conductive agent, organic solvent and additive, the additive is lithium titanium aluminum phosphate and / or doped titani...

Embodiment 1

[0051] This embodiment provides a method for preparing a positive electrode material and a cylindrical lithium secondary battery, the steps are as follows:

[0052] (11) Mix lithium nickel cobalt manganate, lithium titanium aluminum phosphate, binder, conductive agent, and NMP according to a mass ratio of 96.5:2:1:0.5:100 to obtain a slurry-like positive electrode material;

[0053] (12) Coating the obtained positive electrode material on the surface of the positive electrode current collector and baking in an oven at 120°C for 20 minutes to obtain the positive electrode;

[0054] (13) The obtained positive electrode, negative electrode, and separator (transverse and longitudinal tensile strength> 1300kgf / cm 2 , transverse elongation ≤ 50%, longitudinal elongation ≥ 90%, purchased from Sumitomo Chemical, Japan) After winding, the final diaphragm is finished, and the termination tape is pasted to fasten the cell, and then put into a steel shell and baked , liquid injection, se...

Embodiment 2

[0056] This embodiment is basically the same as Embodiment 1, except that the content of lithium titanium aluminum phosphate is 3%.

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Abstract

The invention belongs to the technical field of lithium secondary battery positive electrode materials, and particularly relates to a positive electrode material, a positive electrode, a preparation method of the positive electrode, and a lithium secondary battery. According to the positive electrode material disclosed by the invention, lithium titanium aluminum phosphate and / or doped lithium titanium aluminum phosphate are / is used as the additive, so that the weight impact resistance of the lithium secondary battery can be remarkably improved, the ionic conductivity of the positive electrodematerial can be improved, the impedance and the temperature rise are reduced, and the cycle life of the lithium secondary battery is further prolonged.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium secondary batteries, and in particular relates to a cathode material, a cathode and a preparation method thereof, and a lithium secondary battery. Background technique [0002] Secondary batteries, especially lithium secondary batteries, have become a new generation of energy storage containers in today's society. Lithium secondary battery has high electrochemical performance, its development is relatively rapid, and its application fields are becoming more and more extensive. However, the heavy impact safety and acupuncture safety in traditional lithium secondary batteries are often difficult to guarantee. At present, the means to improve the safety of lithium secondary batteries is mainly to add flame retardant additives to the electrolyte, but the flame retardant additives will affect the electrochemical performance of lithium secondary batteries to varying degrees, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M4/505H01M4/525H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 赵悠曼
Owner DONGGUAN CHUANGMING BATTERY TECH
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