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Cathode additive, preparation method thereof, cathode sheet and lithium battery

A technology of additives and cathode sheets, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor electronic conductivity and ion conductivity, harsh humidity and oxygen content, unstable results, etc., and achieve high cycle performance and rate performance, low charge transfer resistance, and high energy density

Active Publication Date: 2018-11-13
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] FMC mainly uses its product SLMP (Stable lithium metal powder) to supplement lithium on the anode, but because SLMP has strict requirements on ambient humidity and oxygen content when used, the result of using SLMP in the existing environment is unstable, and the industrialization of SLMP The use also needs to solve the problem of storage and use environment. Moreover, there is a safety risk of dust explosion in lithium supplementation of inert metal lithium powder, and there are also disadvantages of high cost of material and equipment transformation.
[0005] In addition, lithium-containing compounds can also be added to the cathode as cathode additives. This method of supplementing lithium has simple process and low cost, but the electronic conductivity and ion conductivity of such cathode additives themselves and their delithiated products are usually very poor. Poor, it will increase the internal resistance (DCR) and charge transfer resistance (Rct) of the lithium battery, reduce the discharge capacity of the lithium battery, and will also have a certain impact on the cycle performance and rate performance of the lithium battery, which cannot meet the needs of high energy density lithium batteries. usage requirements

Method used

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  • Cathode additive, preparation method thereof, cathode sheet and lithium battery

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preparation example Construction

[0026] Next, the preparation method of the cathode additive according to the second aspect of the present invention is described, which is used to prepare the cathode additive described in the first aspect of the present invention, including the steps of: making lithium-containing compounds, compounds containing M elements, and compounds containing N elements by Li , the molar ratio of M and N is x:a:b dissolved in the solvent, stirred to obtain a uniform mixed solution, then evaporated the solvent and dried to obtain the precursor of the inorganic lithium salt, wherein, 2≤x≤8, 0x m a N b o y ; ultrasonically disperse the inorganic lithium salt particles in a solution containing a conductive agent, evaporate the solvent, and dry to obtain a composite material formed of the inorganic lithium salt and the conductive agent, which is to complete the preparation of the cathode additive.

[0027] In the preparation method of the cathode additive according to the second aspect of th...

Embodiment 1

[0047] (1) Preparation of cathode additive

[0048] Dissolve the lithium-containing compound lithium acetate and the Fe-containing compound iron nitrate in absolute ethanol at a molar ratio of Li and Fe of 5:1, stir to obtain a uniform mixed solution, heat the above mixed solution while stirring, evaporate the solvent, and dry , to obtain the inorganic lithium salt Li 5 FeO 4 Precursors; Li will be obtained 5 FeO 4 The precursor was calcined twice under a nitrogen atmosphere. The temperature of the first calcination was 550°C for 8 hours, and the temperature of the second calcination was 900°C for 30 hours. After that, it was naturally cooled, ground and sieved, and then The particle size D50 of 0.1 μm Li was obtained by ball milling with a sand mill. 5 FeO 4 Particles; Li 5 FeO 4Particles are ultrasonically dispersed in NMP solution containing conductive agent graphene, the solvent is evaporated and dried to obtain Li 5 FeO 4 / graphene composite material, complete t...

Embodiment 2

[0057] The preparation process of the lithium-ion battery is the same as in Example 1, except that: when preparing the cathode additive, the inorganic lithium salt Li 5 FeO 4 Replaced with Li 5 Fe 0.5 Al 0.5 o 4 , the cathode additive uses Li 5 Fe 0.5 Al 0.5 o 4 / graphene composite, in the cathode membrane, LiCoO 2 , Li 5 Fe 0.5 Al 0.5 o 4 / graphene composite material (Li 5 Fe 0.5 Al 0.5 o 4 The particle size D50 is 0.1 μm, the mass fraction of graphene is 5%), and the mass ratio of Super P and PVDF is 91:6:1.4:1.6.

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Abstract

The invention provides a cathode additive, a preparation method thereof, a cathode sheet and a lithium battery. The cathode additive includes a composite material formed by an inorganic lithium salt and a conductive agent. The inorganic lithium salt includes a substance with the general formula being Li<x>MNO<y>, wherein 2<=x<=8, 0<a<=1, 0<=b<1, a+b>=1, 2<=y<=6, the M is one selected from Fe, Co, Mn, Ni, Zr, V, Nb and Mo, and the N is one selected from Al, Mg, Ti, Cr, Y, Sr, Si, W, Ga and Zn. The cathode additive can improve the first discharge capacity of the lithium battery, reduce thecharge transfer impedance of the lithium battery, and improve the energy density, cycle performance and rate performance of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a cathode additive, a preparation method thereof, a cathode sheet and a lithium battery. Background technique [0002] Lithium batteries are widely used in consumer electronics products, such as mobile phones, notebook computers, cameras, etc., due to their advantages of high working voltage, no memory effect, high energy density and long cycle life. In recent years, lithium batteries have been gradually used on a large scale In the field of electric vehicles and energy storage, this puts forward higher requirements for the energy density, power density, cycle performance and safety performance of lithium batteries. [0003] Anode materials such as tin and tin-based alloys, silicon and silicon-based alloys, and hard carbon have absolute advantages in specific capacity and low working potential compared with graphite-based anode materials, and are recognized as anode materials f...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525H01M4/131
CPCH01M4/131H01M4/364H01M4/525H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 彭刚郎野徐磊敏
Owner NINGDE AMPEREX TECH
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