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Lithium battery positive pole containing silicon tin material and transition metal and manufacturing method thereof

A transition metal and lithium battery technology, applied in the field of electrochemistry, can solve the problems of large foam metal thickness, low porosity, and affecting battery capacity, so as to achieve the effect of increasing capacity and improving capacity.

Inactive Publication Date: 2013-10-23
广州市华南新能源研究院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the lithium-iron disulfide battery of the prior art, during the discharge process of the battery, the positive iron disulfide has a volume expansion effect, which seriously affects the safety performance and discharge stability of the battery.
At present, there are two main solutions: one is to place compressible or elastic metals, such as foamed metal and metal springs, on the outside of the positive electrode. Although this method can buffer the expansion of the material, it sacrifices the battery's internal The effective space seriously affects the performance of the battery capacity; the second is to build a metal skeleton structure for the positive electrode, using foamed nickel, aluminum foam, copper foam, etc. as the current collector. On the one hand, the foamed metal has a large thickness and low porosity, which also sacrifices a lot of space inside the battery
[0010] Therefore, people urgently need the emergence of a new type of battery material, which can solve the problem of sacrificing the internal space capacity of the battery while effectively solving the problem of battery positive electrode expansion.

Method used

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  • Lithium battery positive pole containing silicon tin material and transition metal and manufacturing method thereof
  • Lithium battery positive pole containing silicon tin material and transition metal and manufacturing method thereof
  • Lithium battery positive pole containing silicon tin material and transition metal and manufacturing method thereof

Examples

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Embodiment 1

[0036] Such as figure 1 As shown, Embodiment 1 of the present invention provides a flow chart of a method for preparing a cathode material for a lithium battery.

[0037] Step (S101), pour iron disulfide with a purity greater than or equal to 99% into an acid-resistant and corrosion-resistant container, add a small amount of absolute ethanol, and stir evenly at high speed; the stirring time is 30 minutes. Regarding the material mixing environment, air drying is required and moisture should be strictly controlled.

[0038] Step (S102), adding transition metals and conductive agents in sequence, appropriately replenishing absolute ethanol, and continuing to stir at a high speed; the transition metals include, for example, nickel (Ni), cobalt (Co), manganese (Mn), iron (Fe) , one or more of copper (Cu) or its metal oxides, because transition metals and their oxides have certain metal ductility, they can effectively buffer the volume effect of the positive electrode during the di...

Embodiment 2

[0046] A positive electrode material for a lithium-iron disulfide battery was prepared in the manner of the above-mentioned Example 1. Such as figure 2 Described: step (S201) mix iron disulfide and silicon with a purity greater than or equal to 99% and pour it into an acid-resistant and corrosion-resistant container, add a small amount of absolute ethanol, and stir evenly at high speed. Subsequent steps ( S202 ) to steps ( S205 ) are completely consistent with Embodiment 1. In the embodiment of the present invention, silicon (Si) element is added. In fact, tin (Sn) has the same properties as silicon and can be used as well, or a mixture of silicon and tin is also available. Because Sn and Si have high lithium intercalation capacity, the theoretical specific capacity of Sn is 994mAh / g, and the theoretical specific capacity of Si is as high as 3000mAh / g. Therefore, under the premise of not affecting the safety performance of the battery, the doping of silicon-tin metal can sig...

Embodiment 3

[0050] Such as image 3 As mentioned above, on the basis of preparing the positive electrode material of the lithium battery through steps S301 to S305, the electrode sheet is rolled and cut to make it a positive electrode of a specific type of battery. Taking the AG13 battery as an example, in step (S306), the pole piece is rolled to 4mm; in step (S307), the pole piece is punched into a circular pole piece with a diameter of 11mm through the mold, which can be used as the positive electrode of the AG13 battery used. Of course, those skilled in the art know that this positive electrode material can be used to prepare all button batteries and cylindrical batteries with an output voltage of about 1.5V. It only needs to be rolled and cut to a certain thickness and shape according to the specific model of the battery. .

[0051] Taking the manufacture of AG13 battery as an example, a series of corresponding experiments were carried out with the corresponding mass ratio of the po...

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Abstract

The invention discloses a preparation method of a lithium battery positive pole material, a preparation method of a positive pole, a battery positive pole prepared by the preparation method and a battery using the battery positive pole. The preparation method of the battery material comprises the following steps: pouring iron disulfide with the purity of greater than or equal to 99% into an acid-resistant corrosion-resistant vessel, adding a small amount of anhydrous ethanol, and stirring uniformly at high speed; sequentially adding the transition metal and conducting agent, properly supplementing anhydrous ethanol, and continuing stirring uniformly at high speed; diluting a binding agent, and thoroughly stirring; pouring the diluted binding agent into the produced slurry, and thoroughly mixing; coating the mixed slurry on a porous steel mesh, and drying in a vacuum drying oven to form a pole piece; and carrying out rolling and die cutting molding. The scheme is beneficial to solving the problem of expansion of the battery positive pole in the discharge process, and further enhances the battery capacity by utilizing the battery internal space.

Description

technical field [0001] The invention relates to a technique in the field of electrochemistry, in particular to a method for preparing a positive electrode material of a lithium battery and a positive electrode of a lithium battery prepared by using the material. Background technique [0002] In recent years, with the rapid development of digital products and electronic products in the direction of diversification and miniaturization, batteries are required to have large specific energy, high specific power, long life, reasonable price, and convenient use, so the demand for high-power and large-capacity batteries is rapid Increase. At present, primary batteries are widely used in many applications, such as ordinary zinc-manganese and alkaline zinc-manganese batteries. With the development of electronic technology and information technology, ordinary zinc-manganese batteries and alkaline manganese batteries can no longer meet the requirements of high-end electronic equipment. ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/08H01M4/06H01M4/80H01M4/38
CPCY02E60/12
Inventor 黄天候徐前忠黄钊文
Owner 广州市华南新能源研究院