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
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  • Claims
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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

Method used

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

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Example Embodiment

[0026] Next, describe the preparation method of the cathode additive according to the second aspect of the present invention, which is used to prepare the cathode additive described in the first aspect of the present invention, including the steps of: pressing the lithium-containing compound, the M element-containing compound, and the N element-containing compound according to Li The molar ratio of , M and N is x:a:b. Dissolve in the solvent, stir to obtain a homogeneous mixed solution, then evaporate the solvent and dry to obtain the precursor of the inorganic lithium salt, wherein 2≤x≤8, 0x M a N b O y and ultrasonically dispersing the inorganic lithium salt particles in a solution containing a conductive agent, evaporating the solvent, and drying to obtain a composite material formed by the inorganic lithium salt and the conductive agent, that is, the preparation of the cathode additive is completed.

[0027] In the preparation method of the cathode additive according to t...

Example Embodiment

[0046] Example 1

[0047] (1) Preparation of cathode additives

[0048] The lithium-containing compound lithium acetate and the compound ferric nitrate containing Fe element are dissolved in absolute ethanol according to the molar ratio of Li and Fe as 5:1, and a homogeneous mixed solution is obtained by stirring. The above mixed solution is heated while stirring to evaporate the solvent and dry. , to obtain the inorganic lithium salt Li 5 FeO 4 The precursor of ; the Li to be obtained 5 FeO 4 The precursor was calcined twice in a nitrogen atmosphere. The temperature of the first calcination was 550 °C for 8 h, and the temperature of the second calcination was 900 °C for 30 h. After that, it was cooled naturally, ground and sieved, and then Ball milling with a sand mill to obtain Li with a particle size D50 of 0.1 μm 5 FeO 4 particles; Li 5 FeO 4The particles were ultrasonically dispersed in an NMP solution containing conductive agent graphene, the solvent was evaporat...

Example Embodiment

[0056] Example 2

[0057] The preparation process of the lithium ion battery is the same as that in Example 1, the difference is: when preparing the cathode additive, the inorganic lithium salt Li 5 FeO 4 Change to 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 cathode diaphragm, LiCoO 2 , Li 5 Fe 0.5 Al 0.5 O 4 / graphene composite (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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