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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  • 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, ele

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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Example Embodiment

[0074] In the method for preparing the lithium pre-insertion negative electrode, a metal material is used as a working electrode, a material capable of providing a lithium source is used as a counter electrode, and a lithium salt solution containing additives is used as an electrolyte to charge or discharge a half-cell assembled. The working mechanism of the above-mentioned pre-insertion of lithium is: in the process of charging or discharging, the additives in the electrolyte are first decomposed, thereby forming an SEI passivation film on the surface of the metal material. In the further charging or discharging process, the 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-insertion of lithium. The counter electrode is mainly to provide a lithium source for pre-insertion of lithium; the working electrode using metal materials is the pre-ins...

Example Embodiment

[0127] Example 1

[0128] A method for preparing a pre-embedded lithium negative electrode includes the following steps:

[0129] a) Take an aluminum foil with a thickness of 50μm, cut it into a disc with a diameter of 12mm, clean 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 the 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 it is completely dissolved, and prepare an electrolyte with a final additive content of 10wt.%;

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

[0133] e) In a glove box with an argon atmosphere, the...

Example Embodiment

[0134] Example 2-13

[0135] A method for preparing a pre-inserted 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 the other steps and parameters are the same as those in Example 1.

[0136] The lithium ion capacitor including the pre-inserted lithium negative electrode prepared in Examples 1-13, the preparation method includes the following steps:

[0137] a) Weigh a certain amount of lithium hexafluorophosphate in the glove box and add it to the 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 to 2mL of N-methylpyrrolidone, and fully grind to obtain a uniform slurry; then evenly coat the slurry on the surface of the aluminum foil, ...

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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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