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The preparation method of li6coo4 pre-lithiation agent and lithium ion capacitor and lithium ion capacitor

A technology of capacitors and lithium ions, which is applied in the field of capacitors, lithium ion capacitors and pre-lithiation agents, can solve the problems of low capacity, influence on Li electrochemical performance, excessive particle size, etc., and achieve high capacity and pre-lithiation The effect of controlling the degree and increasing the energy density

Active Publication Date: 2019-05-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li prepared by traditional synthetic methods 6 CoO 4 The lower capacity is mainly due to the large size of the precursor, resulting in the final synthesis of Li 6 CoO 4 The particle size is too large, affecting the Li 6 CoO 4 electrochemical performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] One using Li 6 CoO 4 The preparation method of the lithium ion capacitor of pre-lithiation, comprises the following steps:

[0028] 1. Li 6 CoO 4 Preparation of:

[0029] (1) Nano-CoO is prepared by solution heat method: dissolve cobalt nitrate in absolute ethanol, and the concentration of cobalt ions is 0.05moL L -1 , add oleic acid and control the volume ratio of absolute ethanol to oleic acid to be 5:1, after ultrasonic mixing, transfer the mixture to a high-pressure reactor, react at 130°C for 4 hours, then cool naturally, wash and filter 1. Obtain nano-CoO with a particle size of 280nm after drying;

[0030](2) Weigh Li at a molar ratio of 3:1 2 O and nano-CoO, after ball milling for 6 hours, reacted at 600°C for 12 hours under argon gas, and obtained a particle size of 10 μm after cooling, and a capacity of 560mAh g -1 , the first effect is 10%, and the specific surface area is 200m 2 g -1 Li 6 CoO 4 .

[0031] 2. Activated carbon (50wt%), Li 6 CoO 4...

Embodiment 2

[0038] One using Li 6 CoO 4 The preparation method of the lithium ion capacitor of pre-lithiation, comprises the following steps:

[0039] 1. Li 6 CoO 4 Preparation of:

[0040] (1) Nano-CoO is prepared by solution heat method: dissolve cobalt sulfate in absolute ethanol, and the concentration of cobalt ions is 0.2moL L -1 , add palmitic acid and control the volume ratio of absolute ethanol and palmitic acid to 10:1, after ultrasonic mixing, transfer the mixture to a high-pressure reactor, react at 140°C for 6h, then cool naturally, wash and filter 1. Obtain nano-CoO with a particle size of 180 nm after drying;

[0041] (2) Weigh Li at a molar ratio of 3:1 2 O and nano-CoO, after ball milling for 6 hours, reacted at 700°C for 12 hours under argon gas, and obtained a particle size of 8 μm after cooling, Li 6 CoO 4 The capacity is 470mAh·g -1 , the first effect is 13%, and the specific surface area is 350m 2 g -1 Li 6 CoO 4 .

[0042] 2. Activated carbon (70wt%), L...

Embodiment 3

[0049] One using Li 6 CoO 4 The preparation method of the lithium ion capacitor of pre-lithiation, comprises the following steps:

[0050] 1. Li 6 CoO 4 Preparation of:

[0051] (1) Nano-CoO is prepared by solution heat method: cobalt acetate is dissolved in absolute ethanol, and the concentration of cobalt ions is 0.3moL L -1 , add linoleic acid and control the volume ratio of absolute ethanol to linoleic acid to 18:1, after ultrasonic mixing, transfer the mixture to a high-pressure reactor, react at 180°C for 4 hours, then cool naturally, wash , filtering, and drying to obtain nano-CoO with a particle size of 130nm;

[0052] (2) Weigh Li at a molar ratio of 3:1 2 O and nano-CoO, after ball milling for 8 hours, reacted at 750°C for 15 hours under argon atmosphere, and obtained a particle size of 5 μm after cooling, Li 6 CoO 4 The capacity is 780mAh·g -1 , the first effect is 6%, and the specific surface area is 900m 2 g -1 Li 6 CoO 4 .

[0053] 2. Activated carb...

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Abstract

A preparation method of a Li6CoO4 pre-lithiated agent comprises the following steps of (1) dissolving a cobalt salt in absolute ethyl alcohol, adding fatty acid, placing the mixture in a high-pressurereaction kettle for reaction after uniform mixing with ultrasound, and performing cooling, washing, filtering and drying to obtain nanometer CoO; and (2) performing ball-milling after the nanometer CoO obtained in the step (1) and Li2O are uniformly mixed, performing sintering in an atmosphere of inert gas, and performing cooling to obtain Li6CoO4. The invention also provides a preparation methodfor a lithium ion capacitor by employing the Li6CoO4 pre-lithiated agent. The Li6CoO4 is not severe in environmental requirement and can be coated with a positive electrode material, the operation issimple, the pre-lithiation degree of a negative pole plate is controllable, the effect is obvious, the Li6CoO4 can be achieved under an existing lithium 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, and have 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 technology in lithium capacitors is mainly the method of spraying lithium powder on the negative electrode. Although this method is relatively simple, it has the disadvantages of insufficient utilization of lithium metal, difficulty in controlling the compensation amount, and excessive local lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/06H01G11/84
CPCY02E60/13
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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