Method for preparing cathode additive for lithium secondary battery, and cathode additive for lithium secondary battery, prepared thereby

A lithium secondary battery and additive technology, applied in secondary batteries, electrode manufacturing, lithium storage batteries, etc., can solve the problems of high irreversible capacity loss, increased viscosity gelation of the composition, and difficulty in evenly coating the electrode composition. The effect of achieving excellent electrochemical and lifetime characteristics

Active Publication Date: 2021-01-12
LG ENERGY SOLUTION LTD
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  • Summary
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  • Description
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Problems solved by technology

However, there is a problem that these anode materials have low initial efficiency and thus high irreversible capacity loss during initial charge / discharge
In addition, when preparing a composition for manufacturing an electrode, by-products such as LiOH react with binder components, thereby increasing the viscosity of the composition or causing gelation, thus making it difficult to uniformly coat for forming an active material layer electrode composition, and degrades the characteristics of the battery
[0010]Furthermore, free LiOH and / or free Li derived from LiOH can degrade the cycle efficiency of the positive electrode, and lithium oxides or nickel oxides exhibit little fundamental capacity , thus possibly reducing the capacity of the irreversible additive

Method used

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  • Method for preparing cathode additive for lithium secondary battery, and cathode additive for lithium secondary battery, prepared thereby

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preparation example Construction

[0037] According to an embodiment of the present invention, a method for preparing a positive electrode additive for a lithium secondary battery is provided, which includes the following steps: mixing a lithium raw material, a nickel raw material, and an optional raw material containing an element M, and then heat-treating it to The lithium nickel oxide of the following chemical formula 1 was produced,

[0038] Wherein, the lithium raw material includes Li 2 O and LiOH, wherein, relative to the total weight of the lithium raw material, LiOH is used in an amount of 3 to 25% by weight, and wherein the positive electrode additive comprises the lithium nickel oxide:

[0039] [chemical formula 1]

[0040] Li 2 Ni 1-x m x o 2

[0041] In Chemical Formula 1,

[0042] M is selected from the group consisting of transition metals, amphoteric elements, P, F and B, wherein M is not nickel, and

[0043] 0≤x<1.

[0044] As a result of continuous research and experiments, the presen...

Embodiment 1

[0099] 14g of Li as a lithium raw material 2 O and 1 g of LiOH were mixed with 37 g of NiO as a nickel raw material, and then calcined at 700 °C for 15 h under a nitrogen atmosphere to obtain Li 2 NiO 2 positive electrode additive particles.

Embodiment 2

[0101] 13g of Li as a lithium raw material 2 O and 2 g of LiOH were mixed with 37 g of NiO as a nickel raw material, and then calcined at 700 °C for 15 h under a nitrogen atmosphere to obtain Li 2 NiO 2 positive electrode additive particles.

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Abstract

The present invention relates to: a method for preparing a cathode additive for a lithium secondary battery, the cathode additive having a high irreversible capacity and being capable of preventing gelation and reducing gas generation; and the cathode additive prepared thereby. The method for preparing a cathode additive comprises a step of mixing a lithium material, a nickel material and, optionally, a material containing an element M, and then heat-treating same, thereby preparing a predetermined lithium nickel oxide, wherein the lithium material comprises Li2O and LiOH, and LiOH is used inan amount of 5-10 wt% on the basis of the total weight of the lithium material.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority to Korean Patent Application No. 10-2018-0124564 filed with the Korean Intellectual Property Office on October 18, 2018, the disclosure of which is hereby incorporated by reference in its entirety. [0003] The invention relates to a method for preparing a positive electrode additive for a lithium secondary battery and the positive electrode additive prepared thereby. The positive electrode additive has high irreversible capacity and can prevent gelation and reduce gas generation. Background technique [0004] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources has rapidly increased. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage, long cycle life, and low self-discharge rate are commercially available and widely used. [0005] Graphit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/62H01M4/525H01M4/505H01M10/052H01M4/02
CPCH01M4/525Y02E60/10C01G53/42C01P2006/40H01M10/0525H01M4/131H01M4/1391H01M4/364H01M4/62H01M4/505H01M10/052H01M2004/028H01M4/0471H01M4/382
Inventor 李宝蓝朴信英李大珍金学允金泰坤郑王谟
Owner LG ENERGY SOLUTION LTD
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