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Lithium metal negative electrode, preparation method and lithium ion battery

A lithium metal negative electrode, lithium metal technology, applied in the field of lithium metal negative electrode, can solve the problems of reducing battery energy density, unsatisfactory lithium deposition morphology, improving energy density, etc., so as to suppress the formation of lithium dendrites and reduce local current density. , the effect of low overpotential

Inactive Publication Date: 2020-07-10
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The development of 3C electronic equipment and electric vehicles has put forward higher and higher requirements for secondary batteries, and the current commercial lithium-ion battery system has approached the limit of energy utilization, and it is difficult to further greatly improve it through process or device optimization. Energy density, electrodes and materials with higher energy density are urgently needed
However, the current three-dimensional current collectors (such as foamed nickel / copper, etc.) have high quality, which will reduce the energy density of the battery when used, and the materials such as nickel / copper have insufficient lithium affinity, and the lithium deposition morphology is not ideal.

Method used

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  • Lithium metal negative electrode, preparation method and lithium ion battery
  • Lithium metal negative electrode, preparation method and lithium ion battery
  • Lithium metal negative electrode, preparation method and lithium ion battery

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preparation example Construction

[0032] see image 3 , a preferred embodiment of the present invention also provides a method for preparing the lithium metal negative electrode 100, comprising the following steps:

[0033] Step S11, preparing an oxidizing solution in an inert atmosphere.

[0034] Wherein, the oxidizing solution includes an oxidizing agent and an organic solvent. Wherein, the oxidant has an oxidation effect on lithium metal; the organic solvent has good solubility to the oxidant, is stable to the lithium metal, and does not cause side reactions with the lithium metal. Preparation of the oxidizing solution in an inert atmosphere prevents reduction of the oxidizing agent.

[0035] In this embodiment, the oxidizing agent includes at least one of iodine, bromine and chlorine. The concentration of the oxidizing agent is 1-50mg mL -1 . Preferably, the concentration of the oxidizing agent is 10-30mg mL -1 . The organic solvent includes at least one of tetrahydrofuran, carbon disulfide, N-methy...

Embodiment 1

[0047] The first step is to prepare 5mL concentration of 15mg mL in an argon protection glove box -1 solution of iodine in tetrahydrofuran and store it in a glass bottle. Wherein, in the argon protective atmosphere, the molar fractions of oxygen and water vapor are respectively lower than 5 ppm and 1 ppm.

[0048] In the second step, the lithium metal sheet is soaked in the tetrahydrofuran solution of iodine, and the glass bottle is sealed with a parafilm.

[0049]In the third step, the packaged glass bottle is transferred to the air, and the glass bottle is placed in an ultrasonic device for ultrasonic treatment. The ultrasonic frequency is set to 20kHZ, the ultrasonic temperature is 30°C, and the ultrasonic time is 300s.

[0050] The fourth step is to transfer the glass bottle to the argon protection glove box, take out the lithium metal sheet after ultrasonic treatment, and clean the treated lithium metal sheet with tetrahydrofuran cleaning agent, so as to obtain the Lith...

Embodiment 2

[0052] This embodiment is with respect to embodiment 1, and difference is: in the first step, the concentration of iodine is 30mgmL -1 .

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Abstract

The invention provides a lithium metal negative electrode, which comprises a substrate and a surface layer formed on the substrate, the substrate and the surface layer are both made of lithium metal or lithium alloy, the surface layer is provided with a plurality of holes, and the plurality of holes are communicated with each other to form a three-dimensional network structure. The lithium metal negative electrode has relatively high lithium affinity. The invention also provides a preparation method of the lithium metal negative electrode and a lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium metal negative electrode, a preparation method of the lithium metal negative electrode and a lithium ion battery. Background technique [0002] The development of 3C electronic equipment and electric vehicles has put forward higher and higher requirements for secondary batteries, and the current commercial lithium-ion battery system has approached the limit of energy utilization, and it is difficult to further greatly improve it through process or device optimization. Energy density, electrodes and materials with higher energy density are urgently needed. [0003] The lithium metal anode has a high theoretical specific capacity (3860mAh g -1 ) and low electrode potential (−3.04 V), so it has great development potential as an ideal anode for metal-ion batteries with the highest theoretical energy density. However, lithium metal anodes are prone to form lithium dend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M10/0525
CPCH01M4/049H01M4/134H01M4/1395H01M10/0525Y02E60/10
Inventor 吕伟谷思辰康飞宇杨全红
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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