Positive additive and preparation method and application thereof

An additive and positive electrode technology, applied in the field of positive electrode additives and its preparation, can solve the problems of inapplicability to large-scale industrial production, complex preparation process, complex synthesis process, etc., and achieve the effects of increasing irreversible capacity, simplifying the preparation process, and high charging capacity

Pending Publication Date: 2020-09-11
GUANGDONG BRUNP RECYCLING TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] currently available on Li 2 NiO 2 The synthesis process of lithium supplement material is all comparatively complicated, and the raw material cost of preparation is high, discloses a kind of supplement lithium material Li as CN110218078A patent application 2 NiO 2 And preparation method and application thereof, comprise the steps: S1. with Li 2 O, Ni 2 CO 3 , Al(OH) 3 As the raw material, acetone is used as the solvent, and ball milling is carried out in a protective atmosphere after mixing; S2. The ball milled product is dried to obtain a powder; S3. The powder is pre-calcined at a low temperature in a protective atmosphere; S4. The pre-fired product is Ball milling in a protective atmosphere, taking out the ball milled product and pressing it into a tablet; S5. Sintering the product obtained in step S4 at a high temperature to obtain the target lithium supplement material Li 2 NiO 2
This application prepares Li 2 NiO 2 The lithium salt is Li 2 O, the cost of raw materials is high; the mixing method is wet ball milling, and a protective atmosphere needs to be introduced during mixing, so the difficulty of mixing is high; the sintering process is to pre-fire at low temperature first, and then sinter at high temperature after ball milling the pre-fired products ; The Li 2 NiO 2 The preparation process is complicated, the preparation cost is high, and it is not suitable for large-scale industrial production

Method used

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  • Positive additive and preparation method and application thereof
  • Positive additive and preparation method and application thereof
  • Positive additive and preparation method and application thereof

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Experimental program
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Embodiment 1

[0039] The chemical formula of the positive electrode additive of the present embodiment is Li 2 NiO 2, the particle size is D50=7.5μm, and the initial charge capacity is 332mAh / g.

[0040] The preparation method of the positive electrode additive of the present embodiment, comprises the steps:

[0041] (1) The nickel-based precursor Ni(OH) synthesized by co-precipitation method 2 ;

[0042] (2) The precursor Ni(OH) 2 and lithium salt LiOH·H 2 O is mixed by ball milling at the ratio of Li / Ni=3:1 in molar ratio, the mixing time is 2h, and the rotating speed is 400rpm to obtain the mixed powder;

[0043] (3) The mixed powder is sintered at 300°C for 2h in a nitrogen atmosphere, sintered at 500°C for 2h, and then sintered at 700°C at a heating rate of 1°C / min for 20h to obtain Li 2 NiO 2 .

[0044] A method for preparing a positive electrode sheet, comprising the following steps:

[0045] (1) Will Li 2 NiO 2 Mix it with nickel-cobalt lithium manganese oxide ternary pos...

Embodiment 2

[0049] The chemical formula of the positive electrode additive of the present embodiment is Li 2 Ni 0.5 Cu 0.5 o 2 , the particle size is D50=4.5μm, and the initial charging capacity is 308mAh / g.

[0050] The preparation method of the positive electrode additive of the present embodiment, comprises the steps:

[0051] (1) The nickel-based precursor Ni synthesized by co-precipitation method 0.5 Cu 0.5 (OH) 2 ;

[0052] (2) The precursor Ni 0.5 Cu 0.5 (OH) 2 and lithium salt LiOH·H 2 O is mixed by ball milling at the ratio of Li / Ni=2.5:1 in molar ratio, the mixing time is 4h, and the rotating speed is 200rpm to obtain the mixed powder;

[0053] (3) The mixed powder was sintered at 200°C for 5h in a nitrogen atmosphere, sintered at 400°C for 4h, and then sintered at a heating rate of 5°C / min to 650°C for 10h to obtain Li 2 Ni 0.5 Cu 0.5 o 2 .

[0054] A method for preparing a positive electrode sheet, comprising the following steps:

[0055] (1) Will Li 2 Ni 0....

Embodiment 3

[0059] The chemical formula of the positive electrode additive of the present embodiment is Li 2 Ni 0.5 mn 0.5 o 2 , the particle size is D50=5.6μm, and the initial charging capacity is 305mAh / g.

[0060] The preparation method of the positive electrode additive of the present embodiment, comprises the steps:

[0061] (1) The nickel-based precursor Ni synthesized by co-precipitation method 0.5 mn 0.5 (OH) 2 ;

[0062] (2) The precursor Ni 0.5 mn 0.5 (OH) 2 and lithium salt LiOH·H 2 O is mixed by ball milling at the ratio of Li / Ni=2.5:1 in molar ratio, the mixing time is 4h, and the rotating speed is 200rpm to obtain the mixed powder;

[0063] (3) The mixed powder was sintered at 200°C for 5h in a nitrogen atmosphere, sintered at 400°C for 4h, and then sintered at a heating rate of 5°C / min to 650°C for 10h to obtain Li 2 Ni 0.5 mn 0.5 o 2 .

[0064] A method for preparing a positive electrode sheet, comprising the following steps:

[0065] (1) Will Li 2 Ni 0....

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Abstract

The invention discloses a positive additive as well as a preparation method and application thereof. The chemical formula of the positive additive is Li2Ni1-xMxO2, wherein x is equal to 0-0.5, and when x is larger than 0, M is at least one of Co, Mn, Cu, Fe and Cr. The Li2Ni1-xMxO2 prepared by the preparation method disclosed by the invention has the characteristics of high charging capacity and low first effect; when the additive is added into the positive plate of the lithium ion battery, lithium can be removed before the positive electrode material in the battery formation process to replace the positive electrode material to provide lithium required to be consumed for forming an SEI film by a negative electrode, so that the initial coulombic efficiency of the battery is improved, and the cycle performance is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a positive electrode additive and a preparation method and application thereof. Background technique [0002] During the formation process of lithium-ion batteries, an SEI film will be formed on the surface of the negative electrode. This process needs to consume part of the lithium ions in the positive electrode material, resulting in irreversible capacity loss of the positive electrode material and a decrease in the first Coulombic efficiency. In order to reduce the loss of lithium in the battery system, battery manufacturers usually introduce pre-lithiation technology in the battery production process to realize lithium supplementation to the battery system. At present, the most commonly used method is to supplement lithium at the negative electrode, such as introducing lithium foil or lithium metal powder to supplement lithium, but the method of supplementing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/485H01M4/131H01M4/1391H01M10/0525C01G53/00
CPCH01M4/525H01M4/505H01M4/485H01M4/131H01M4/1391H01M10/0525C01G53/42C01G53/50C01P2002/72C01P2004/03C01P2006/40C01P2004/61H01M2004/021H01M2004/028Y02E60/10
Inventor 缪建麟刘伟健陈希文陈喜阮丁山李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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