Anode active substance, production method thereof, and lithium ion battery employing anode active substance

A positive active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problem of large apparent specific surface area (mainly affected by light carbon elements, lithium iron phosphate powder vibration The problems of low compaction and compaction density, and difficult implementation of the carbon coating method have achieved the effect of superior high-temperature storage performance, significant production practical significance, and improved market application prospects.

Inactive Publication Date: 2012-06-13
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
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Problems solved by technology

[0006] Although the above three methods can improve the electrochemical performance of lithium iron phosphate to a certain extent, there are certain defects.
For example, the carbon coating method is an effective method in improving the conductivity of lithium iron phosphate powder, but because of the introduction of organic light carbon elements, the relatively small density of lithium iron phosphate powder itself is vibrated and compacted. The density is smaller and the apparent specific surface area is relatively large (mainly affected by light carbon elements), which brings difficulties to the subsequent battery processing procedures. In addition, in large-scale commercial production, th

Method used

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  • Anode active substance, production method thereof, and lithium ion battery employing anode active substance
  • Anode active substance, production method thereof, and lithium ion battery employing anode active substance
  • Anode active substance, production method thereof, and lithium ion battery employing anode active substance

Examples

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preparation example Construction

[0062] 1. Preparation of negative electrode sheet: mix the negative electrode active material (such as graphite), conductive agent (such as carbon black SP), polyvinylidene fluoride (PVDF, as a binder) uniformly, and add it to the solvent N, N dimethyl ratio And then mix and stir evenly to obtain a fluid negative electrode slurry. The negative electrode slurry is evenly coated on the negative electrode current collector (such as copper foil) and then dried to make the negative electrode slurry completely in A negative electrode active material layer (ie, negative electrode slurry coating) is formed on the surface of the negative electrode current collector, thereby preparing a negative electrode sheet. In addition, in the present invention, the metal lithium sheet can be used as the negative electrode active material directly as the negative electrode.

[0063] 2. Preparation of positive electrode sheet: the positive electrode active material of the present invention (such as lit...

Embodiment 1

[0087] First, mix the aqueous solution of lithium hydroxide and phosphoric acid in a molar ratio of 3:1, and stir to form a white lithium phosphate suspension, and then mix ferrous sulfate with a molar ratio of 1:0.002 and the organic acid additive citric acid. The resulting mixed solution was added dropwise to the suspension, stirred and adjusted the pH value to about 4.8, then the suspension was transferred to the reactor, and reacted at 230°C for 8-12 hours. After the reaction, Obtain a light green precipitate, and then wash it with water or ethanol several times, then go through ball milling for 4-8 hours, then dry it under a vacuum of 80°C, and then calcinate at a temperature of 650°C under a protective atmosphere to sinter Obtain nano-lithium iron phosphate, and finally mix the obtained nano-lithium iron phosphate and high-conductivity carbon nanotubes (CNT) together to obtain a lithium metal phosphate compound Li x M y PO 4 A composite material formed by mixing with carbo...

Embodiment 2

[0089] The positive electrode active material was prepared in the same manner as in Example 1, except that the calcination temperature was changed to 600°C, and the same method as in Example 1 was used to prepare a lithium metal phosphate compound Li x M y PO 4 A composite material formed by mixing with carbon nanotube CNT (that is, the positive electrode active material).

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Abstract

The invention discloses an anode active substance comprising at least one phosphoric acid metal lithium compound and at least one carbon material. The phosphoric acid metal lithium compound has a structural formula of LixMyPO4, wherein M is any transition metal element, x is no smaller than 0 and no larger than 1, and y is no smaller than 0.8 and no larger than 1.2. Also, the invention discloses a production method of the anode active substance and a lithium ion battery employing the anode active substance. According to the invention, with the anode active substance, the diffusion performance of lithium ions can be greatly improved, such that the conductivity of the material can be improved. Therefore, low-resistance improvement can be realized, and negative influences caused by a current carbon cladding method can be avoided. The purity and crystallinity of lithium iron phosphate can be ensured; compaction density and consistency of the material can be improved; and the lithium ion battery employing the anode active substance is provided with good multiplying performance, good low-temperature performance, good high-temperature storing performance, and excellent cyclic performance.

Description

Technical field [0001] The present invention relates to the technical field of batteries, in particular to a positive electrode active material, a production method thereof, and an applied lithium ion battery. Background technique [0002] At present, lithium ion secondary battery is an ideal chemical power source recognized internationally. It has many advantages such as high voltage, high energy density, long cycle life, low self-discharge, no memory effect, wide operating temperature range, and no pollution. It is widely used Used in mobile phones, laptop computers, portable power tools, weaponry, etc. [0003] With the increasing development of lithium-ion batteries, lithium-ion power batteries with large capacity and high rate charging and discharging have also become the focus of competition in various countries around the world. Lithium-ion power batteries will be mainly used in electric vehicles, electric motorcycles, electric bicycles, backup power UPS, military equipmen...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/66H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 金慧芬高俊奎步绍宁刘震
Owner TIANJIN LISHEN BATTERY
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