Lithium ion battery positive electrode material and preparation method and application thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problems affecting the capacity, rate and cycle performance of lithium-ion batteries, the increase in the valence state of transition metal elements, and the increase in interface impedance and other problems, to achieve the effects of alleviating the dissolution of transition metals and gas production, reducing side reactions, and reducing the increase in interfacial impedance

Inactive Publication Date: 2020-02-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for positive electrode materials, when working at high voltage (high delithiation state), lithium vacancies will be generated with the extraction of lithium ions, and at the same time, under the action of charge balance in the material system, the valence state of transition metal elements will increase, making the surface of the material matrix It presents a chemical environment with a high oxidation state, and it is easy to undergo redox reactions with the electrolyte, resulting in (1) an irreversible phase change in the crystal structure of the material surface (layered structure transforms into a rock metal salt phase structure), and the specific capacity decays; (2) the material and Side reactions occur in the electrolyte, and the transition metal elements dissolve, accompanied by gas production; (3) The by-products generated by the reaction between the material matrix and the electrolyte deposit on the surface of the matrix, resulting in an increase in interface impedance and aggravating capacity fading; ultimately affecting the capacity of lithium-ion batteries, Rate and Cycle Performance

Method used

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  • Lithium ion battery positive electrode material and preparation method and application thereof
  • Lithium ion battery positive electrode material and preparation method and application thereof
  • Lithium ion battery positive electrode material and preparation method and application thereof

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preparation example Construction

[0113] Firstly, the preparation method of covering the coating layer on the surface of the positive electrode material substrate through the sintering process is introduced. The preparation method of this lithium ion battery cathode material may comprise the following steps:

[0114] Feed the lithium source, the transition metal source, and the material used to form the coating layer according to the molar ratio of each element in the chemical formula of the positive electrode material of the lithium ion battery, and stir and mix evenly to obtain a mixture;

[0115] placing the mixture in a heating furnace for sintering to obtain a sintered product;

[0116] The sintered product is crushed to obtain the positive electrode material of the lithium ion battery.

[0117] The preparation method of the cathode material of the lithium ion battery can be produced through one sintering process, and the process is relatively simple.

[0118] As an example, the positive electrode mater...

Embodiment 1

[0158] This embodiment provides a method to dope Li 0.95 La 0.05 CoO 2 As the core, the surface is covered with Al 2 o 3 The core-shell positive electrode material and the method of assembling it into a pouch battery:

[0159] 1) Preparation of doped lithium cobalt oxide matrix: Li 0.95 La 0.05 CoO 2

[0160] Take Li respectively 2 CO 3 ,Co 3 o 4 and La 2 o 3 , according to the molar ratio of lithium, cobalt, and lanthanum 1.06:1:0.05, stir and mix evenly, place in a muffle furnace or sintering furnace for temperature sintering, keep it at 1050°C for 12 hours, collect the product after natural cooling, and crush it Collected to obtain doped lithium cobaltate Li 0.95 La 0.05 CoO 2 .

[0161] 2) Doped lithium cobaltate Li 0.95 La 0.05 CoO 2 Preparation of core-shell cathode materials for primary particle matrix

[0162] Get the doped cobaltate lithium Li of step 1) preparation 0.95 La 0.05 CoO 2 20g, then infiltrated with ethanol and tiled onto a glass s...

Embodiment 2

[0166] This embodiment provides a method to dope Li 0.95 Al 0.04 La 0.01 CoO 2 As the core, the surface is covered with AlF 3 The core-shell positive electrode material and the method of assembling it into a pouch battery:

[0167] 1) Preparation of doped lithium cobalt oxide matrix: Li 0.95 Al 0.04 La 0.01 CoO 2

[0168] Take Li respectively 2 CO 3 ,Co 3 o 4 , La 2 o 3 and Al 2 o 3 , according to the molar ratio of lithium, cobalt, aluminum, and lanthanum 1.06:1:0.04:0.01, stir and mix evenly, then place it in a muffle furnace or sintering furnace for temperature sintering, keep it at 1050°C for 12 hours, and collect the product after natural cooling , and crushed and collected to obtain doped lithium cobaltate Li 0.95 Al0.04 La 0.01 CoO 2 .

[0169] 2) Doped lithium cobaltate Li 0.95 Al 0.04 La 0.01 CoO 2 Preparation of core-shell cathode materials for primary particle matrix

[0170] Get the doped cobaltate lithium Li of step 1) preparation 0.95 Al...

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Abstract

The invention discloses a lithium ion battery positive electrode material. The lithium ion battery positive electrode material is of a core-shell structure, wherein the core of the core-shell structure is a positive electrode material matrix, and the shell of the core-shell structure is a coating layer coating the surface of the positive electrode material matrix; the material for forming the positive electrode material matrix is a lithium ion material containing an oxygen element; the material for forming the coating layer is a material containing metal ions; and a chemical bond is formed between the metal ions in the coating layer and the oxygen element on the surface of the lithium ion material, so that the coating layer uniformly and stably coats the surface of the positive electrode material matrix. The positive electrode material improves the capacity and cycle performance of the lithium ion battery. In addition, the invention further discloses a lithium ion battery positive electrode plate and a lithium ion battery.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular to a lithium-ion battery cathode material and its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely used in consumer electronics, mobile terminals, communication energy storage and other fields due to their advantages such as high energy density and power density, small size, high safety, and environmental friendliness. Especially for mobile terminal devices such as smart phones, with the gradual enhancement of their functions and the increase of frequency of use, consumers' demand for long battery life and fast charging is becoming stronger and stronger. However, the current lithium-ion battery manufacturing process has reached its limit, and further improvement in performance can only rely on material progress and optimization. [0003] In the current lithium-ion battery system, the negative electrode graphite m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525H01M10/058
CPCH01M4/131H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李政杰李阳兴
Owner HUAWEI TECH CO LTD
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