Lithium ion battery pre-lithiation agent and preparation method and application thereof

A technology of lithium-ion batteries and lithiation agents, applied in the field of lithium-ion batteries, can solve the problems of difficulty in large-scale industrial production and application, poor conductivity and air stability, and high cost of material preparation, so as to improve air stability and improve The effect of conductivity and simple sintering process

Pending Publication Date: 2022-05-27
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inverse fluorite structural materials such as Li 5 FeO 4 With high irreversible capacity, it is an ideal positive electrode pre-lithiation material, but its conductivity and air stability are extremely poor, and the material preparation cost is high and difficult, making it difficult to achieve large-scale industrial production and application

Method used

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  • Lithium ion battery pre-lithiation agent and preparation method and application thereof
  • Lithium ion battery pre-lithiation agent and preparation method and application thereof
  • Lithium ion battery pre-lithiation agent and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0038] In this example, a prelithiation agent for lithium ion batteries is prepared, and the chemical formula is Li 5 FeO 4 @C, whose structure is given by Li 5 FeO 4 Secondary particles formed by agglomeration of primary particles, and carbon-coated Li 5 FeO 4 Surface of primary particles, carbon content of 10 wt.%, Li 5 FeO 4 The particle size of primary particles is less than or equal to 10 μm. The specific preparation process is:

[0039] (1) FeCl 3 ·6H2 O and acidified graphene were added to anhydrous ethanol solvent in a molar ratio of C:Fe=0.59:0.41, and mixed solution A was obtained by ultrasonic dispersion, and acidified graphene was prepared by stirring graphene in 10wt.% nitric acid for 1h;

[0040] (2) drip ammonia water to mixed solution A, ammonia water and Fe 3+ The ratio of mol ratio is 3:1, and the process of dripping ammonia water is carried out ultrasonic stirring and dispersing simultaneously, and the mixed solution B of hydroxide and graphene is p...

Embodiment 2

[0044] In this example, a prelithiation agent for lithium ion batteries is prepared, and the chemical formula is Li 5 FeO 4 @C, whose structure is given by Li 5 FeO 4 Secondary particles formed by agglomeration of primary particles, and carbon-coated Li 5 FeO 4 Surface of primary particles, carbon content of 5 wt.%, Li 5 FeO 4 The particle size of primary particles is less than or equal to 10 μm. The specific preparation process is:

[0045] (1) The FeNO 3 ·9H 2 O and acidified polypyrrole in molar ratio C:Fe=0.40:0.54 were added to the mixed solvent with mass ratio of water:ethanol=1:1, and mixed solution A was obtained by ultrasonic dispersion. The acidified polypyrrole was soaked by polypyrrole in 15wt.% It is prepared by stirring in permanganic acid for 2h;

[0046] (2) drip ammonia water to mixed solution A, ammonia water and Fe 3+ The ratio of mol ratio is 2.5:1, and the process of dripping ammonia water is carried out ultrasonic stirring and dispersing simult...

Embodiment 3

[0050] In this example, a prelithiation agent for lithium ion batteries is prepared, and the chemical formula is Li 5 FeO 4 @C, whose structure is given by Li 5 FeO 4 Secondary particles formed by agglomeration of primary particles, and carbon-coated Li 5 FeO 4 Surface of primary particles, carbon content of 2 wt.%, Li 5 FeO 4 The particle size of primary particles is less than or equal to 10 μm. The specific preparation process is:

[0051] (1) FeCl 3 ·6H 2 O and acidified carbon nanotubes were added into ethylene glycol solvent in a molar ratio of C:Fe=0.21:0.71, and a mixed solution was obtained by stirring and dispersing. The acidified carbon nanotubes were prepared by immersing carbon nanotubes in 5wt.% perchloric acid and stirring. have to;

[0052] (2) drip ammonia water to mixed solution A, ammonia water and Fe 3+ The ratio of mol ratio is 2:1, and the process of dripping ammonia water is carried out ultrasonic stirring and dispersing simultaneously, and the...

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Abstract

The invention discloses a lithium ion battery pre-lithiation agent and a preparation method and application thereof, the chemical formula of the lithium ion battery pre-lithiation agent is Li5FeO4 (at) C, the structure of the lithium ion battery pre-lithiation agent is secondary particles agglomerated by Li5FeO4 primary particles, and the surfaces of the Li5FeO4 primary particles are coated with carbon. The carbon source and the soluble salt of Fe are mixed, Fe ions are attached to the carbon source, hydroxide with small particles and good dispersity can be formed after ammonia water is added, then nanoscale oxide is obtained through solvothermal reaction, the carbon source plays a role in blocking among the particles in the subsequent sintering process, growth of primary particles is slowed down, and the performance of the catalyst is improved. The pre-lithiation agent prepared by the method is relatively small in primary particle, relatively short in Li < + > removal path during charging and good in rate capability. The pre-lithiation agent can provide enough Li < + > when the battery is charged for the first time, so that an SEI film is generated on the surface of a negative electrode, the loss of Li < + > in a positive electrode material is reduced, and the coulombic efficiency and the capacity of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery prelithiation agent and a preparation method and application thereof. Background technique [0002] During the first charging process of lithium-ion batteries, an SEI film will be formed on the surface of the negative electrode. This process needs to consume part of the active lithium in the positive electrode material, and this part of lithium cannot be returned to the positive electrode material during the battery discharge process, resulting in the discharge capacity of the positive electrode material and the first coulomb. Efficiency is reduced. The pre-lithiation technology is an effective way to solve the capacity loss of the positive electrode material caused by the formation of the negative electrode SEI film of the lithium ion battery. + Losses in this process, thereby improving the efficiency of Li+ use and increasing the...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/525H01M10/0525H01M10/42
CPCH01M10/0525H01M4/1395H01M10/4235H01M4/525Y02E60/10C01B32/15C01G49/0027C01P2004/50C01P2004/80C01P2004/03C01P2002/72C01P2006/40C01B32/168C01G49/02C09C1/56H01M4/0459H01M4/1391H01M2004/028
Inventor 缪建麟李长东阮丁山蔡勇刘伟健
Owner GUANGDONG BRUNP RECYCLING TECH
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