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

專利號
US11996560B1
公開日期
2024-05-28
申請人
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

In one embodiment, the specific surface area of the positive electrode material is measured after being compressed. In particular, the positive electrode material is compressed under a pressure i, ground and sieved. The specific surface area of the positive electrode material through the sieve is tested. SSAi is the specific surface area of the positive electrode material after compressing, and SSA0 is the specific surface area of the positive electrode material before compressing. The increase rate in the specific surface area is calculated using the formula ΔSSAi=(SSAi?SSA0/SSA0.

In a preferred embodiment, when the compressing pressure i is 1.5 tons, the positive electrode material after compressing may have an increase rate in the specific surface area ΔSSA1.5 of not more than 15%;

    • or, when the compressing pressure i is 2.5 tons, the positive electrode material after compressing may have an increase rate in the specific surface area ΔSSA2.5 of not more than 40%;
    • or, when the compressing pressure i is 3.5 tons, the positive electrode material after compressing may have an increase rate in the specific surface area ΔSSA3.5 of not more than 60%;
    • or, when the compressing pressure i is 4.5 tons, the positive electrode material after compressing may have an increase rate in the specific surface area ΔSSA4.5 of not more than 100%.

權(quán)利要求

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