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Preparation method of pre-embedded lithium cathode and prepared pre-embedded lithium cathode, energy storage device, energy storage system and electric equipment

A technology of pre-embedded lithium and negative electrode, which is applied in the direction of circuits, capacitors, electrical components, etc., can solve the problems of increasing the overall cost of the battery, and achieve the effects of low device cost, good cycle performance, and high energy density

Active Publication Date: 2019-04-26
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned method needs to adopt more complex process means, such as laser perforation, electrochemical corrosion, high-temperature carbonization, etc., which increases the overall cost of the battery

Method used

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  • Preparation method of pre-embedded lithium cathode and prepared pre-embedded lithium cathode, energy storage device, energy storage system and electric equipment
  • Preparation method of pre-embedded lithium cathode and prepared pre-embedded lithium cathode, energy storage device, energy storage system and electric equipment
  • Preparation method of pre-embedded lithium cathode and prepared pre-embedded lithium cathode, energy storage device, energy storage system and electric equipment

Examples

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Effect test

preparation example Construction

[0074] In the preparation method of the above-mentioned pre-intercalated lithium negative electrode, the metal material is used as the working electrode, the material capable of providing lithium source is used as the counter electrode, and the lithium salt solution containing additives is used as the electrolyte to charge or discharge the assembled half-cell. The working mechanism of the above-mentioned pre-intercalated lithium is: in the process of charging or discharging, the additive in the electrolyte first decomposes, thereby forming an SEI passivation film on the surface of the metal material, and in the process of further charging or discharging, lithium ions pass through the passivation film An alloying reaction occurs with the metal material to form an alloy of the metal material and lithium, thereby completing the process of pre-intercalating lithium. The counter electrode is mainly to provide a lithium source for pre-intercalation of lithium; the working electrode u...

Embodiment 1

[0128] A method for preparing a pre-intercalated lithium negative electrode, comprising the following steps:

[0129] a) Take an aluminum foil with a thickness of 50 μm, cut it into a disc with a diameter of 12 mm, wash it with acetone and ethanol, dry it and place it in a glove box as a working electrode for standby;

[0130] b) Weigh a certain amount of lithium hexafluorophosphate in the glove box, and add it to a mixture of ethylene carbonate, dimethyl carbonate and diethyl carbonate (the volume ratio of the three is 1:1:1) to prepare 1M lithium hexafluorophosphate electrolyte;

[0131] c) Weigh a certain amount of lithium difluorooxalate borate, stir until completely dissolved, and prepare an electrolyte solution with a final additive content of 10wt.%.

[0132] d) Cut the glass fiber paper into discs with a diameter of 16mm, dry it in vacuum at 80°C for 12 hours, and place it in a glove box as a diaphragm for later use;

[0133] e) In a glove box with an argon atmospher...

Embodiment 2-13

[0135] A method for preparing a pre-intercalated lithium negative electrode. The difference from Example 1 is that the mass fraction of lithium difluorooxalate borate in the electrolyte in Examples 2-13 is different, and other steps and parameters are the same as in Example 1.

[0136] The lithium ion capacitor comprising the pre-embedded lithium negative electrode prepared in Examples 1-13, the preparation method comprises the following steps:

[0137] a) Weigh a certain amount of lithium hexafluorophosphate in the glove box, and add it to a mixture of ethylene carbonate, dimethyl carbonate and diethyl carbonate (the volume ratio of the three is 1:1:1) to prepare 1M lithium hexafluorophosphate electrolyte;

[0138] b) Add 0.8g of activated carbon (AC), 0.1g of conductive carbon black, and 0.1g of polyvinylidene fluoride into 2mL of N-methylpyrrolidone, grind thoroughly to obtain a uniform slurry; then evenly coat the slurry on the surface of the aluminum foil, Vacuum dry at ...

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Abstract

The invention relates to the field of new energy, and particularly relates to a preparation method of a pre-embedded lithium cathode and the prepared pre-embedded lithium cathode, an energy storage device, an energy storage system and electric equipment. The preparation method of the pre-embedded lithium cathode comprises the following steps: providing a semi-battery, and charging or discharging the semi-battery, wherein the working electrode of the semi-battery is a metal material, the counter electrode is a material capable of providing a lithium source, and the electrolyte is a lithium saltsolution containing an additive; the metal material comprises a metal, an alloy or a metal composite material capable of carrying out alloying reaction with lithium ions; the additive includes a substance capable of decomposing and forming an SEI film on the surface of the metallic material. The method is simple in process and low in cost; an SEI passivation film can be formed on the surface of the metal material, so that volume expansion and pulverization of the cathode can be avoided, thereby improving discharge capacity and cycle performance.

Description

technical field [0001] The invention relates to the field of new energy, in particular, to a method for preparing a pre-intercalated lithium negative electrode, and the prepared pre-intercalated lithium negative electrode, an energy storage device, an energy storage system and electrical equipment. Background technique [0002] As a green energy storage device, secondary batteries represented by lithium-ion batteries store and discharge electricity through the reversible conversion between electrical energy and chemical energy, and are widely used in various fields. Lithium-ion batteries are mainly composed of positive and negative active materials, current collectors, electrolyte rings, and separators. Lithium-ion batteries rely on lithium ions to move back and forth between the positive electrode and the negative electrode (intercalation and deintercalation process) to realize the charging and discharging process of the battery (so it is also called "rocking chair battery"...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M10/0525H01M10/054H01G11/30H01G11/06H01G11/86
CPCH01G11/06H01G11/30H01G11/86H01M4/134H01M4/1395H01M10/0525H01M10/054Y02E60/10
Inventor 唐永炳张阁欧学武
Owner SHENZHEN INST OF ADVANCED TECH
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