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Positive electrode material of lithium-ion battery and preparation method therefor

專利號(hào)
US11996560B1
公開日期
2024-05-28
申請(qǐng)人
Beijing Easpring Material Technology Co., Ltd.（CN Beijing）
發(fā)明人
Junfan Tong; Yanbin Chen; Yuqiang Jin; Wenbo Wang; Xuequan Zhang; Yafei Liu
IPC分類
H01M4/00; C01G53/00; H01M4/131; H01M4/505; H01M4/525; H01M10/0525
技術(shù)領(lǐng)域
calcining,electrode,positive,manganese,cobalt,dopant,material,nickel,lithium,in
地域： Beijing

摘要

The present disclosure relates to a positive electrode material for a lithium ion battery and its preparation. The positive electrode material in accordance with the present disclosure has an intrinsic specific surface area of 5-13 m2/g. The positive electrode material in accordance with the present disclosure has an intrinsic specific surface area and an intrinsic pore size within the required ranges. In this regard, the positive electrode material in accordance with the present disclosure has excellent particle strength, excellent Li ion transference ability, and good resistance to electrolyte erosion. When used in lithium batteries, it may impart the batteries with excellent rate performance and cycle performance. The present disclosure also relates to a method for preparing the positive electrode material.

說明書

TECHNICAL FIELD

The present disclosure relates to lithium ion batteries, more particularly to a positive electrode material for a lithium ion battery and a method for preparing the same.

BACKGROUND

Lithium ion batteries are a type of secondary battery and have advantages such as high specific energy, high cell voltage, long cycle life, and the like. They have been widely used in fields such as mobile phones, laptops, and the like. The various components of a lithium ion battery, mainly including positive electrode materials, separators, electrolytes and negative electrode materials, have their own functions. The electrode materials are key components of a battery, which may determine the generation of electrical energy. Compared with negative electrode materials, positive electrode materials are the most important factor affecting battery performances. They may directly determine the capacity and cycle performance of a lithium ion battery. It is necessary to develop more optimized positive electrode materials to match the demand on further improving the safety and specific energy of a battery.

Ternary materials have been proposed as positive electrode materials for batteries. The ternary material may have a formula of LiNixCoyM1-x-yO2 (wherein M is Mn or Al). They may be divided into NCM and NCA according to the different types of the metal M. They have become one of the mainstream choices for positive electrode materials and have been widely developed and applied.

權(quán)利要求

1
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:1. A positive electrode material comprising an intrinsic specific surface area of 5-13 m2/g, wherein the positive electrode material has an intrinsic pore size which meets the following equations: 2.1 nm≤R10≤2.5 nm, 23.0 nm≤R50≤27.0 nm and 100.0 nm≤R90≤160.0 nm.2. The positive electrode material of claim 1, wherein the positive electrode material has an average particle size of 7.8-14.2 μm, orthe positive electrode material has a compacted density of 2.0-3.8 g/cm3.3. The positive electrode material of claim 1, wherein, when the positive electrode material is compressed under a pressure of 1.5 tons, the positive electrode material after compressing has an increase rate in the specific surface area ΔSSA1.5 of not more than 15%; orwhen the positive electrode material is compressed under a pressure of 2.5 tons, the positive electrode material after compressing has an increase rate in the specific surface area ΔSSA2.5 of not more than 40%; orwhen the positive electrode material is compressed under a pressure of 3.5 tons, the positive electrode material after compressing has an increase rate in the specific surface area ΔSSA3.5 of not more than 60%; orwhen the positive electrode material is compressed under a pressure of 4.5 tons, the positive electrode material after compressing has an increase rate in the specific surface area ΔSSA4.5 of not more than 100%.4. The positive electrode material of claim 1, comprising a doped nickel cobalt manganese active material and optionally a coating layer on at least part of the surface thereof, wherein the nickel cobalt manganese active material in the doped nickel cobalt manganese active material has a formula of LiNixCoyMnzO2, wherein dopants of the doped nickel cobalt manganese active material comprise a first dopant element M, which is at least one selected from a group consisting of Al and Zr; a second dopant element G, which is at least one selected from a group consisting of Y, Ti, Nb, Cr, Er and Mg; and a third dopant element T, which is at least one selected from a group consisting of Ba, V, Sr, Ta, Mo, W and Ce, wherein the doped nickel cobalt manganese active material has a formula of Li1?a(NixCoyMnzMdGeTf)O2, wherein 0≤a≤0.1, 0.3≤x≤0.99, 0.01≤y≤0.5, 0.01≤z≤0.5, 0≤d≤0.08, 0≤e≤0.05, 0≤f≤0.03, 1≤e/f≤5, and x+y+z+d+e+f=1, and wherein the coating layer comprises at least one oxide selected from a group consisting of B2O3, Al2O3, SiO2 and W2O5.5. A positive electrode for a lithium battery, comprising the positive electrode material of claim 1.6. A lithium battery, comprising a positive electrode, a negative electrode and a separator between the positive and negative electrodes, wherein the positive electrode comprises the positive electrode material of claim 1.
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