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Lithium ion capacitor, and preparation method of Li5FeO4 pre-lithiation agent and lithium ion capacitor

A technology of capacitors and lithium ions, which is applied in the field of energy storage devices, can solve problems affecting Li, etc., and achieve the effects of controllable pre-lithiation, improved cycle stability, and increased energy density

Active Publication Date: 2018-02-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Li 5 FeO 4 It is a lithium metal oxide with an inverse fluorite structure and has a very high specific capacity, with a theoretical capacity of 867mAh g -1 , in addition, its first charge and discharge efficiency is low, therefore, Li 5 FeO 4 It is an ideal pre-intercalated lithium additive
However, the Li prepared by the traditional synthesis method 5 FeO 4 The lower capacity is mainly due to the large size of the precursor, resulting in the final synthesis of Li 5 FeO 4 The particle size is too large, which affects the Li 5 FeO 4 electrochemical performance

Method used

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  • Lithium ion capacitor, and preparation method of Li5FeO4 pre-lithiation agent and lithium ion capacitor
  • Lithium ion capacitor, and preparation method of Li5FeO4 pre-lithiation agent and lithium ion capacitor

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Experimental program
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Effect test

Embodiment 1

[0028] One using Li 5 FeO 4 The preparation method of the lithium ion capacitor of pre-lithiation, comprises the following steps:

[0029] 1. Li 5 FeO4 Preparation of:

[0030] (1) Nano Fe 2 o 3 Prepared by solution heat method: Dissolve ferric nitrate and polyvinylpyrrolidone in dimethylformamide at a mass ratio of 1:1, stir evenly, move the solution to a high-pressure reactor, react at 130°C for 8 hours, and then The product is taken out and centrifuged, washed, suction filtered and dried to obtain nano-Fe with a particle size of 280nm 2 o 3 ;

[0031] (2) Weigh LiOH-H at a molar ratio of 10:1 2 O and nano Fe 2 o 3 , after ball milling for 6 hours, react at 650°C for 12 hours under the condition of argon, and obtain a diameter of 9 μm after cooling, and a capacity of 490mAh·g -1 , the first effect is 13%, and the specific surface area is 240m 2 g -1 Li 5 FeO 4 .

[0032] 2. Activated carbon (50wt%), Li 5 FeO 4 The pre-lithiation agent (30wt%), Super P (10wt...

Embodiment 2

[0039] One using Li 5 FeO 4 The preparation method of the lithium ion capacitor of pre-lithiation, comprises the following steps:

[0040] 1. Li 5 FeO 4 Preparation of:

[0041] (1) Nano Fe 2 o 3 Prepared by solution heat method: Dissolve ferric nitrate and polyvinylpyrrolidone in dimethylformamide at a mass ratio of 2:1, stir evenly, move the solution to a high-pressure reactor, react at 150°C for 24 hours, and then The product is taken out and centrifuged, washed, suction filtered and dried to obtain nano-Fe with a particle size of 280nm 2 o 3 ;

[0042] (2) Weigh LiOH-H at a molar ratio of 10:1 2 O and nano Fe 2 o 3 , after ball milling for 10 hours, react at 750°C for 24 hours under argon gas, and obtain a diameter of 7 μm and a capacity of 550mAh g after cooling. -1 , the first effect is 8%, and the specific surface area is 480m 2 g -1 Li 5 FeO 4 .

[0043] 2. Activated carbon (70wt%), Li 5 FeO 4 The pre-lithiation agent (10wt%), Super P (10wt%) and PVD...

Embodiment 3

[0051] One using Li 5 FeO 4 The preparation method of the lithium ion capacitor of pre-lithiation, comprises the following steps:

[0052] 1. Li 5 FeO 4 Preparation of:

[0053] (1) Nano Fe 2 o 3 Prepared by solution heat method: Dissolve ferric nitrate and polyvinylpyrrolidone in triethylene glycol at a mass ratio of 3:1, stir evenly, move the solution to a high-pressure reactor, react at 180°C for 30 hours, and then dissolve the product Take out and centrifuge, wash, filter, and dry to obtain nano-Fe with a particle size of 210nm 2 o 3 ;

[0054] (2) Weigh LiOH-H at a molar ratio of 10:1 2 O and nano Fe 2 o 3 , after ball milling for 10 hours, react at 700°C for 48 hours under the condition of argon, and obtain a diameter of 6 μm and a capacity of 640mAh·g after cooling. -1 , the first effect is 7%, and the specific surface area is 730m 2 g -1 Li 5 FeO 4 .

[0055] 2. Activated carbon (60wt%), Li 5 FeO 4 The pre-lithiation agent (25wt%), Super P (10wt%) an...

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Abstract

The invention discloses a preparation method of a Li5FeO4 pre-lithiation agent. The preparation method comprises the steps of: (1) dissolving ferric salt and polyvinylpyrrolidone in an organic solvent, uniformly mixing the ferric salt and polyvinylpyrrolidone and then placing the mixture in a high-pressure reactor for reaction, and cooling, washing, filtering and drying a product of the reaction to obtain nanometer Fe2O3; and (2) mixing the nanometer Fe2O3 obtained in the step (1) and lithium hydroxide uniformly, performing ball-milling on the mixture, sintering the mixture after ball-millingin an inert gas atmosphere, and carrying out cooling to obtain Li5FeO4. The invention further provides a preparation method of a lithium ion capacitor adopting L5FeO4 pre-lithiation. The prepared L5FeO4 does not have strict requirement for the environment and can be coated together with a positive electrode material, the operation is simple, the pre-lithiation degree of a negative pole piece is controllable, the effect is obvious, the pre-lithiation can be realized under the existing lithium-ion battery manufacturing condition, and the production cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to a lithium ion capacitor, a preparation method of a pre-lithiation agent, and the capacitor. Background technique [0002] Lithium ion capacitors have higher energy density than electric double layer capacitors and higher power density than lithium batteries. It has great application potential in emerging energy fields such as wind power, electric vehicles, and industrial equipment for power generation. Pre-lithiation technology is the core technology of lithium-ion capacitors, and it is also a recognized technical difficulty. At present, the commonly used pre-lithiation technologies in lithium capacitors mainly include negative electrode spraying lithium powder method and diaphragm lithium plating method. Among them, the negative electrode spraying lithium powder method and the diaphragm lithium plating method are very harsh on the production conditions, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/50H01G11/46H01G11/06C01G49/00
CPCY02E60/13H01G11/86C01G49/00H01G11/06H01G11/46H01G11/50
Inventor 郭华军杨哲伟王志兴李新海王接喜彭文杰胡启阳郭云涛
Owner CENT SOUTH UNIV
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