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Secondary battery negative electrode, preparation method of secondary battery negative electrode and secondary battery

A secondary battery and negative electrode technology, applied to battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of electrolyte consumption, high processing cost, and complicated processing technology, and achieve reduced decomposition, high product consistency, and safety good performance

Inactive Publication Date: 2018-10-09
REAL POWER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] By coating the surface of aluminum foil with carbon material, although the compatibility between the negative electrode and the electrolyte is improved, there is still the problem that the electrolyte is easily decomposed to form a solid electrolyte film and consume the electrolyte.
Moreover, the carbon coating method also has the problems of complicated processing technology and high processing cost.

Method used

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  • Secondary battery negative electrode, preparation method of secondary battery negative electrode and secondary battery
  • Secondary battery negative electrode, preparation method of secondary battery negative electrode and secondary battery
  • Secondary battery negative electrode, preparation method of secondary battery negative electrode and secondary battery

Examples

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preparation example Construction

[0043] The second aspect of the embodiment of the present invention provides a method for preparing a negative electrode of a secondary battery, including:

[0044] Provide a metal foil raw material, chemically react the metal foil raw material with a solution containing phosphate radicals or form a dense metal phosphate film on the surface of the metal foil raw material by means of deposition, and obtain a secondary battery negative electrode;

[0045] The negative electrode of the secondary battery includes a metal foil and a dense metal phosphate film arranged on the surface of the metal foil. The metal foil is also used as a negative electrode current collector and a negative electrode active material. The material of the metal foil includes aluminum, copper, Any one of iron, tin, zinc, nickel, manganese, lead, antimony, cadmium and bismuth, or an alloy containing at least one of the above metal elements; the material of the metal phosphate film includes aluminum phosphate,...

Embodiment 1-38

[0078] A method for preparing a negative electrode of a secondary battery, comprising:

[0079] Soak an aluminum foil with a thickness of 50 microns in a phosphoric acid solution with a mass fraction of 50% for 60 minutes, then wash the reacted aluminum foil with pure water three times, place it in an oven, and dry it at a constant temperature for 300 minutes at a temperature of 80°C to obtain Secondary battery negative pole. Finally, the processed negative electrode of the secondary battery is cut into required negative electrode sheets according to the design requirements of the battery.

[0080] figure 1 It is a scanning electron microscope (SEM) picture of common aluminum foil; figure 2 It is the SEM picture of the secondary battery negative pole that is made in embodiment 1 of the present invention; image 3 An enlarged view of the SEM image of the negative electrode of the secondary battery prepared in Example 1 of the present invention; as figure 1 , figure 2 , ...

Embodiment 1-16

[0106] In the embodiment of the present invention, foil materials of different materials and graphite are assembled into a battery for forming tests. For each foil material, a comparison between non-phosphoric acid treatment and phosphoric acid treatment is carried out. The specific preparation and testing methods can refer to the examples. 1, adjust the relevant parameters to get different implementation cases. The specific assembly test results are shown in Table 3.

[0107] Table 3 embodiment parameter data and performance test result

[0108]

[0109] It can be seen from Table 3 that the initial efficiency and cycle performance of the battery after the battery is assembled with the negative electrode obtained after the phosphoric acid treatment of the metal foils of different materials are effectively improved.

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Abstract

The invention provides a secondary battery negative electrode. The secondary battery negative electrode comprises metal foil and a compact metal phosphate film arranged on the surface of the metal foil; the metal foil serves as a negative current collector and an negative electrode active material at the same time and is made of any one of aluminum, copper, iron, tin, zinc, nickel, manganese, lead, antimony, cadmium and bismuth, or an alloy containing at least one of the metal elements; and the metal phosphate film is made of one or more of aluminum phosphate, copper phosphate, iron phosphate,tin phosphate, zinc phosphate, nickel phosphate, manganese phosphate, lead phosphate, antimony phosphate, cadmium phosphate and bismuth phosphate. According to the secondary battery negative electrode, the metal phosphate film which is electrically insulated and is provided with lithium ions capable of migrating is arranged on the surface of the metal foil; the metal phosphate film achieves the similar function of a solid electrolyte membrane; and the compatibility of the negative electrode and electrolyte is improved, and the charging and discharging efficiency of a battery, the cycling performance of the battery, the high-and-low temperature performance and the safety performance are improved. The invention further provides a preparation method of the secondary battery negative electrode and a secondary battery.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a secondary battery negative electrode, a preparation method thereof, and a secondary battery. Background technique [0002] In 2016, researcher Tang Yongbing of the Shenzhen Institutes of Advanced Technology of the Chinese Academy of Sciences and his team made breakthroughs in the research of new high-efficiency batteries. A new aluminum-graphite dual-ion battery technology has been developed. The working principle of this technology is different from that of the existing traditional lithium battery, and it uses cheap graphite as the positive electrode and aluminum foil as the negative electrode active material and current collector; The famous material journal "Advanced Materials" (DOI: 10.1002 / adma.201603735) published "High rate, long cycle, high energy density dual-ion battery based on carbon-coated porous aluminum foil anode" online. Its research team uses aluminum foil ...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/62H01M10/05
CPCH01M4/134H01M4/1395H01M4/62H01M10/05Y02E60/10
Inventor 唐永炳谢呈德
Owner REAL POWER IND LTD
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