Lithium battery positive electrode material, preparation method thereof, lithium battery, and positive electrode piece of lithium battery

A cathode material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow lithium diffusion and charge transfer, poor low temperature performance, affecting battery efficiency, etc., to achieve excellent conductive nodes and improve low temperature performance. , the effect of excellent conductive network

Inactive Publication Date: 2019-05-03
SOUNDON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are many reasons for the poor low-temperature performance of traditional lithium-ion batteries. One of the important reasons is that under low-temperature conditions, the positive electrode material will undergo a side reaction with the electrolyte, and the reaction product will accumulate on the surface of the positive electrode to form a film, causing the interface between the electrode and the electrolyte to Lithium diffusion and charge transfer are relatively slow, affecting battery efficiency

Method used

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  • Lithium battery positive electrode material, preparation method thereof, lithium battery, and positive electrode piece of lithium battery
  • Lithium battery positive electrode material, preparation method thereof, lithium battery, and positive electrode piece of lithium battery
  • Lithium battery positive electrode material, preparation method thereof, lithium battery, and positive electrode piece of lithium battery

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preparation example Construction

[0031] Further, the present invention also provides a method for preparing the positive electrode sheet of the above-mentioned lithium battery, comprising the following steps:

[0032] Add lithium active material, surfactant and oxidant into water, ultrasonically disperse, then add conductive polymer glue and conductive carbon, continue ultrasonically disperse, filter, wash, and vacuum dry the product at 100°C-160°C for 12h-24h.

[0033] Further, the present invention also provides a positive electrode sheet for a lithium battery, which contains the positive electrode material for a lithium battery in any of the above examples, a negative electrode sheet, and an electrolyte.

[0034] In one example, the lithium battery positive sheet also contains a positive electrode binder and a positive electrode conductive agent.

[0035] Still further, the present invention also provides a lithium battery, which includes the above-mentioned positive electrode sheet of the lithium battery....

Embodiment 1

[0052] The lithium battery of this embodiment includes a positive electrode sheet, an electrolyte, a separator, a negative electrode sheet, and tabs.

[0053] Positive electrode sheet: including lithium battery positive electrode material, positive electrode binder and positive electrode conductive agent. The lithium active material in the positive electrode material of the lithium battery is a ternary nickel-cobalt lithium manganese oxide material whose morphology is agglomerates and single crystals, wherein the mass fraction of the agglomerates is 60%. The median particle size (D50) of the agglomerates is 4 μm, and the primary particle size is 550 nm; the median particle size (D50) of the quasi-single crystal is 8 μm. The specific surface area of ​​lithium active material is 0.5m 2 / g, the tap density is 1.5g / cm 3 . The outer surface of the ternary nickel cobalt lithium manganate material is covered with a composite conductive layer. The composite conductive polymer is co...

Embodiment 2

[0059] The difference between the lithium battery of this embodiment and Embodiment 1 is that the composition of the positive electrode sheet, the negative electrode sheet, and the electrolyte is as follows:

[0060] Positive electrode sheet: including lithium battery positive electrode material, positive electrode binder and positive electrode conductive agent. The lithium active material in the positive electrode material of the lithium battery is a ternary nickel-cobalt lithium manganese oxide material whose morphology is agglomerates and single crystals, wherein the mass fraction of the agglomerates is 30%. The median particle size (D50) of the agglomerates is 3 μm, and the primary particle size is 300 nm; the median particle size (D50) of the quasi-single crystal is 7 μm. The specific surface area of ​​the lithium active material is 0.7m 2 / g, the tap density is 1.65g / cm 3 . The outer surface of the ternary nickel cobalt lithium manganate material is covered with a com...

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Abstract

The invention relates to a lithium battery positive electrode material, a preparation method thereof, a lithium battery and a positive electrode piece of the lithium battery. The lithium battery positive electrode material comprises a lithium active material, and the outer surface of the lithium active material is coated with a composite conductive layer, wherein the composite conductive layer isformed by compounding a conductive polymer adhesive and conductive carbon according to a mass ratio of 1: (0.8-1.2). The composite conductive layer can be used as a protective layer, thereby improvingthe interface stability of the positive electrode material, preventing the anode material from being corroded by the electrolyte, preventing side reaction products generated with the electrolyte frombeing accumulated on the surface of the positive electrode, and avoiding the decrease of the lithium diffusion speed and transfer rate of charges between the electrodes and an electrolyte interface.Meanwhile, the composite conductive layer can form an excellent conductive network and an excellent conductive node, so the conductive performance is excellent, the transmission resistance of lithiumions in an electrode material is reduced, and the low-temperature performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery positive electrode material and a preparation method thereof, a lithium battery and a positive electrode sheet thereof. Background technique [0002] Lithium-ion batteries are recognized as the most promising power batteries for electric vehicles due to their advantages such as high specific capacity, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. The operating temperature of lithium-ion batteries is generally between -20°C and 60°C. At lower temperatures, the performance of the battery will drop significantly. For example, at -40°C, the discharge capacity of the battery is only 12% of that at room temperature. [0003] There are many reasons for the poor low-temperature performance of traditional lithium-ion batteries. One of the important reasons is that under low-temperature conditions, the positive e...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/583H01M10/0525
CPCY02E60/10
Inventor 熊俊俏陈小平石谦车欢
Owner SOUNDON NEW ENERGY TECH CO LTD
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