Lithium ion battery negative electrode and pre-lithiation method and application thereof

A lithium-ion battery, pre-lithiation technology, applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problem of low efficiency in the first week, achieve short reaction time, promote energy density and cycle stability Improvement and controllable effect of lithiation depth

Inactive Publication Date: 2019-08-13
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low first-cycle efficiency of the existing lithium-ion battery negative electrode materials, the present invention provides a method for chemical pre-lithiation of the lithium-ion battery negative electrode, which improves the first-cycle efficiency of the negative electrode material and is also a series of high first-cycle The development of high-efficiency, high-energy-density battery systems provides the possibility

Method used

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  • Lithium ion battery negative electrode and pre-lithiation method and application thereof
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  • Lithium ion battery negative electrode and pre-lithiation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Under the protection of an inert atmosphere, mix biphenyl and lithium in an equimolar ratio, and disperse them in a DME solvent. After stirring, a DME (ethylene glycol dimethyl ether) solution of biphenyl lithium is obtained, and the hard carbon electrode (the loading is about 2 mg, containing 90% hard carbon) immersed in 1 mL of 0.25 mol / L DME solution of lithium biphenyl, and reacted for 1 h. After the reaction was complete, it was washed three times with DME and dried for later use.

[0026] (2) The hard carbon electrode before and after pre-lithiation is used as the positive electrode, and the lithium metal is used as the negative electrode, and the ternary electrolyte (1MLiPF 6 EC / DEC / DMC (v:v:v=1:1:1)) Assemble the half-cell, and conduct a charge-discharge test. The charge and discharge curve of the first week is as follows:

[0027] Depend on figure 1 It can be seen that after pre-lithiation, the open-circuit voltage of the half-cell is reduced from 3.301V...

Embodiment 2

[0029] (1) Under the protection of an inert atmosphere, mix naphthalene and lithium in an equimolar ratio, and disperse them in a DME solvent. After stirring, a DME solution of naphthalene lithium is prepared. 70%) was immersed in 1 mL of 0.125 mol / L DME solution of lithium naphthalene and reacted for 4 h. After the reaction was complete, it was washed three times with DME and dried for later use.

[0030] (2) With the nano-silicon electrode before and after pre-lithiation as the positive electrode and the lithium metal as the negative electrode, use a ternary electrolyte (1MLiPF 6 EC / DEC / DMC (v:v:v=1:1:1)) Assemble the half-cell, and conduct a charge-discharge test. The charge and discharge curve of the first week is as follows:

[0031] Depend on figure 2 It can be seen that after pre-lithiation, the open-circuit voltage of the half-cell decreased from 2.824V to 0.677V, and the efficiency increased from 86.67% to 96.66% in the first week.

[0032] (3) The nano-silicon e...

Embodiment 3

[0035] (1) Under the protection of an inert atmosphere, mix naphthalene and lithium in an equimolar ratio, and disperse them in a DME solvent. The cloth is placed on an antimony electrode (loading capacity is about 2.8mg, containing 80% antimony) and reacted for 0.5h. After the reaction was complete, it was washed three times with DME and dried for later use.

[0036] (2) Using the antimony electrode before and after pre-lithiation as the positive electrode and the lithium metal as the negative electrode, use a ternary electrolyte (1MLiPF 6 EC / DEC / DMC (v:v:v=1:1:1)) Assemble the half-cell, and conduct charge-discharge test. The charge and discharge curve of the first week is as follows:

[0037] Depend on Figure 4 It can be seen that after pre-lithiation, the open-circuit voltage of the half-cell decreased from 3.13V to 1.76V, and the efficiency increased from 69.73% to 91.69% in the first week.

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Abstract

The invention discloses a lithium ion battery negative electrode and a pre-lithiation method thereof, and application of the lithium ion battery negative electrode in a battery. In an inert atmosphere, the negative electrode of the lithium ion battery is allowed to react with an aryl lithiation reagent, and the first-cycle irreversible capacity of the negative electrode is removed to obtain higherfirst-cycle capacity. The aryl lithiation reagent is milder than a common lithiation reagent under the condition that the same pre-lithiation effect is achieved. The method has the advantages of normal-temperature reaction, short reaction time, simple process, controllable lithiation depth, high safety and easy industrialization.

Description

technical field [0001] The invention relates to a negative electrode of a lithium ion battery, a pre-lithiation method thereof, and an application thereof in a battery, belonging to the field of new energy sources. Background technique [0002] Under the background of the new era of energy shortage and environmental pollution, the development of clean energy storage systems with high energy density has become a top priority. Lithium-ion batteries have been widely used in portable electronic products, electric vehicles and other fields due to their high energy density, cycle stability and environmental friendliness. In the past 20 years, many important breakthroughs have been made in the research of lithium-ion batteries in terms of energy density, cost, safety, etc., and now the energy density of lithium-ion batteries has reached or approached the limit value of existing electrode materials. But at the same time, lithium-ion batteries still have the problem of first capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 钱江锋杨汉西沈弈非曹余良艾新平
Owner WUHAN UNIV
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