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Preparation method of positive electrode pre-lithiation material, product and application

A technology of positive electrode and lithiating agent is applied in the field of preparation of positive electrode pre-lithiation materials, which can solve the problems of decomposition gas production and low specific capacity, and achieve the effects of high safety, improved stability and simple process.

Active Publication Date: 2021-03-23
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific capacity of these materials is relatively low
Another type of lithium salt such as Li 2 C 4 o 4 , LiC 2 o 2 , Li 2 C 3 o 5 and Li 2 C 4 o 6 Although the specific capacity is high, it will decompose and produce gas during the first charging process

Method used

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  • Preparation method of positive electrode pre-lithiation material, product and application
  • Preparation method of positive electrode pre-lithiation material, product and application
  • Preparation method of positive electrode pre-lithiation material, product and application

Examples

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preparation example Construction

[0031] Preparation method of pre-lithiation agent pole piece

[0032] Me / LiF / Li 2 Mix O and conductive agent (Super~P) evenly, then add polyvinylidene fluoride (PVDF) binder, add a certain amount of N-methylpyrrolidone (NMP), grind evenly, and apply the above mixed slurry on the current collector (such as an aluminum foil current collector), bake at 60° C. and an inert atmosphere for 4 hours, for example, to obtain the required pre-lithiated electrode sheet. Wherein, the formula of the pole piece is (mass ratio) may be pre-lithiation agent: Super~P:PVDF=7:2:1.

[0033] Positive electrode sheet preparation

[0034] Mix the positive electrode active material, pre-lithiation agent and conductive agent (Super~P) evenly, then add polyvinylidene fluoride (PVDF) binder, drop a certain amount of N-methylpyrrolidone (NMP), grind evenly, The above-mentioned mixed slurry is evenly coated on the aluminum foil current collector, and baked at 80° C. under vacuum conditions for 4 hours, f...

Embodiment 1

[0041] Weigh 0.3g FeF 3 After the hydrate was ground in a mortar, it was transferred to a hydrothermal kettle with a capacity of 100mL, and then 75mL of n-propanol was added, sealed and placed in an oven at 200°C for 24h. After the reaction, it was taken out, washed with ethanol, centrifuged three times, and dried in an oven at 60° C. to obtain FeOF solid powder. Then, 0.15 g of FeOF and 0.048 g of metal lithium were weighed in an Ar atmosphere glove box, placed on a heating platform, and molten metal lithium and FeOF were mechanically mixed and reacted at 300° C. After reacting for 1 hour, lower the temperature, and collect black Fe / LiF / Li with a carbon-containing coating layer and a particle size of 2 μm to 20 μm. 2 O powder, Fe, Li 2 The molar ratio of O and LiF satisfies 1:x:y, and 2x+y≤3. Take 7mg of Fe / Li 2 The O / LiF additive was mixed with 2 mg conductive agent (Super~P) and 20 mg PVDF (5wt% PVDF / NMP solution), homogenized, coated, dried in vacuum at 60 ° C, punched...

Embodiment 2

[0044] Weigh 0.3g CoF 3 After the hydrate was ground in a mortar, it was transferred to a hydrothermal kettle with a capacity of 100mL, and then 75mL of n-propanol was added, sealed and placed in an oven at 200°C for 24h. After the reaction, it was taken out, washed with ethanol, centrifuged three times, and then dried in an oven at 60°C to obtain CoOF solid powder. Then, 0.15 g of CoOF and 0.048 g of metal lithium were weighed in an Ar atmosphere glove box, placed on a heating platform, and molten metal lithium and CoOF were mechanically mixed and reacted at 300 ° C. After reacting for 1 hour, lower the temperature, and collect the obtained black Co / LiF / Li 2 O powder, Co, Li 2 The molar ratio of O and LiF satisfies 1:x:y, and 2x+y≤3. Take 7mg of Co / Li 2 The O / LiF additive was mixed with 2 mg conductive agent (Super~P) and 20 mg PVDF (5wt% PVDF / NMP solution), homogenized, coated, dried in vacuum at 60 ° C, punched into pole pieces with a diameter of 10 mm, and Metal lithi...

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a preparation method of a positive electrode pre-lithiation material, a product and application. The preparation method comprises the following steps that: MeOF and metal lithium are weighed according to a molar ratio of 1: 3-4.2 and then placed on a heating table; heating is performed, and the MeOF and the molten metal lithium are stirred and mixed in a protective gas atmosphere for full reaction; and cooling an obtained full reaction product, so that the Me / LiF / Li2O pre-lithiation agent which is mainly composed of anMe simple substance, LiF and Li2O is obtained. The Me / LiF / Li2O pre-lithiation agent mainly composed of Me simple substance, LiF and Li2O can be correspondingly obtained by improving the whole processflow of the preparation method, the composition and proportion of the reaction raw materials and the like; and the problem that the reversible charge-discharge capacity is reduced due to lithium ion loss in the first charge-discharge process of a lithium ion battery can be solved; and the positive electrode pre-lithiation additive is added to a positive electrode, so that the capacity and the energy density of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery energy storage devices, and more specifically relates to a preparation method, product and application of a positive electrode pre-lithiated material. Background technique [0002] The first charge of a lithium-ion battery will form a solid electrolyte interface (SEI) on the surface of the negative electrode. The formation of SEI consumes part of the active lithium ions provided by the positive electrode, resulting in a decrease in the reversible capacity of the battery. At the same time, as the charge-discharge cycle proceeds, side reactions on the electrode surface increase (coulombic efficiency <100%), and active lithium decreases, resulting in poor cycle performance. Especially for the key anode material of high energy density lithium-ion battery——alloy anode material (such as silicon carbon, silicon oxygen and tin, etc.), the coulombic efficiency of material itself is lower than traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 孙永明杜俊谋李政杰夏圣安王涛
Owner HUAZHONG UNIV OF SCI & TECH