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Lithium zirconate-cladded lithium-rich positive material for lithium ion battery and preparation method thereof

A lithium-rich positive electrode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of unsatisfactory charge and discharge rate, specific capacity charging cycle performance, increase the manufacturing cost of lithium-ion batteries, and irreversible capacity of materials Attenuation and other issues, to achieve good cycle performance, high rate charge and discharge capacity, simple and flexible preparation method

Inactive Publication Date: 2014-08-20
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduced metal oxides are usually not conductors of electrons and ions, leading to irreversible capacity fading and poor charge-discharge rate performance of the material.
Based on the above reasons, some Li-containing oxides such as LiAlO 2 and Li 3x La 2 / 3-x TiO 3 , due to its higher Li + conductivity, and can provide Li during charge and discharge + transport channel, so the electrochemical performance of the material can be improved more effectively, but its charge-discharge rate, specific capacity, and charge cycle performance are not ideal enough, and the use of rare earth oxides also increases the manufacturing cost of lithium-ion batteries accordingly

Method used

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  • Lithium zirconate-cladded lithium-rich positive material for lithium ion battery and preparation method thereof
  • Lithium zirconate-cladded lithium-rich positive material for lithium ion battery and preparation method thereof
  • Lithium zirconate-cladded lithium-rich positive material for lithium ion battery and preparation method thereof

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Embodiment 1

[0029] In this embodiment, the lithium-rich positive electrode material of the lithium-ion battery coated with lithium zirconate, with 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 As the core of the composite particles of lithium-rich cathode materials, and with Li 2 ZrO 3 As the shell of composite particles of lithium-rich cathode materials, 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Abbreviated as LMO, where Li 2 ZrO 3 It is referred to as LZO, that is, LMO is coated with LZO to form an LMO-LZO core-shell structure of composite particles with a particle size of 50nm~300nm, forming a LMO-LZO nanocomposite material, in which LZO is in the LMO-LZO lithium-rich cathode material. The weight percent content is 2wt%.

[0030] In this embodiment, the preparation method of the lithium-rich positive electrode material of the lithium-ion battery coated with lithium zirconate comprises the following steps:

[0031] a. Preparation of LMO: According to the chemical element ...

Embodiment 2

[0038] This embodiment is basically the same as Embodiment 1, especially in that:

[0039] In this embodiment, the preparation method of the lithium-rich positive electrode material of the lithium-ion battery coated with lithium zirconate comprises the following steps:

[0040] a. Preparation of LMO: According to the chemical element composition of LMO, the stoichiometric ratio of cobalt acetate, manganese acetate, nickel acetate and lithium acetate was added to the same beaker and dissolved in absolute ethanol to form a metal salt mixture, and keep lithium acetate In the metal salt mixture, according to the excess molar content of 5%, citric acid is used as a chelating agent, dissolved in absolute ethanol, and then the absolute ethanol solution containing citric acid is kept at a constant temperature in an oil bath at 70°C, and then The metal salt mixed solution containing excess lithium acetate is slowly added dropwise into the absolute ethanol solution containing citric aci...

Embodiment 3

[0045] This embodiment is basically the same as the previous embodiment, and the special features are:

[0046] In this embodiment, the preparation method of the lithium-rich positive electrode material of the lithium-ion battery coated with lithium zirconate comprises the following steps:

[0047] a. Preparation of LMO: According to the chemical element composition of LMO, the stoichiometric ratio of cobalt acetate, manganese acetate, nickel acetate and lithium acetate was added to the same beaker and dissolved in absolute ethanol to form a metal salt mixture, and keep lithium acetate In the metal salt mixture, according to the excess molar content of 5%, citric acid is used as a chelating agent, dissolved in absolute ethanol, and then the absolute ethanol solution containing citric acid is kept at a constant temperature in an oil bath at 70°C, and then The metal salt mixed solution containing excess lithium acetate is slowly added dropwise into the absolute ethanol solution ...

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Abstract

The invention discloses a lithium zirconate-cladded lithium-rich positive material for a lithium ion battery and a preparation method thereof. According to the invention, 0.4Li2MnO3.0.6LiNil / 3Co1 / 3Mn1 / 3O2 is used as a core of a composite particle, and Li2ZrO3 is used as a shell of the composite particle of the lithium-rich positive material. Thus, an LMO-LZO core-shell structure of the composite particle with the particle size being 50nm-300nm is formed, and an LMO-LZO nano-composite material is formed. LZO accounts for 1wt%-10wt% of weight of the LMO-LZO lithium-rich positive material. By the utilization of the lithium-rich positive material of a battery, higher charge-and-discharge rate, higher specific capacity, better cycle performance and lower battery production cost can be realized. The preparation method has advantages of simple preparation technology and good repeatability, provides a high-capacity long-life lithium-rich positive material for manufacturing and application of a high-rate lithium ion battery, and is suitable for industrial production.

Description

technical field [0001] The invention relates to an electrode material and a preparation method thereof, in particular to a lithium-ion battery cathode material and a preparation method thereof, which are applied in the technical field of high-capacity batteries. Background technique [0002] As a high-performance green energy storage device, lithium-ion secondary batteries have the characteristics of good performance, safety, low cost, and environmental friendliness. They have a major impact on the sustainable development of today's society in terms of energy generation and storage technologies. At present, it has been widely used in portable electronic products. It also has broad application prospects in the fields of power-assisted vehicles and electric vehicles. It can also play unique advantages in the storage of solar energy and wind energy. One of the key factors in performance development. [0003] Among the currently available cathode materials, LiCoO 2 is a cathod...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525
CPCY02E60/122H01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 方建慧苗晓伟杨刚倪欢施利毅
Owner SHANGHAI UNIV
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