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Lithium supplement positive electrode active material, positive electrode material, lithium ion battery and preparation and application of lithium supplement positive electrode active material

A positive electrode active material and lithium-ion battery technology, applied in the direction of active material electrodes, positive electrodes, battery electrodes, etc., can solve problems such as material residues, adverse effects on overall battery performance, and potential safety hazards

Active Publication Date: 2019-04-12
HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are difficulties in its synthesis, and the materials after the reaction will remain in the positive electrode and adversely affect the overall performance of the battery; other materials such as Li 2 O and other reactions will produce gas and cause safety hazards

Method used

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  • Lithium supplement positive electrode active material, positive electrode material, lithium ion battery and preparation and application of lithium supplement positive electrode active material
  • Lithium supplement positive electrode active material, positive electrode material, lithium ion battery and preparation and application of lithium supplement positive electrode active material
  • Lithium supplement positive electrode active material, positive electrode material, lithium ion battery and preparation and application of lithium supplement positive electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A preparation method for a lithium-ion battery that adopts an organic lithium-supplementing agent (the present invention is also referred to as an organic lithium salt) to supplement lithium, comprising the following steps:

[0065] 1. Preparation of organolithium salt:

[0066] (1) Weigh acetylene lithium ((Li 2 C 2 )) and 2,3,5-trihydroxynitrobenzene were dispersed in an organic solvent and stirred, the stirring speed was 200rpm, and the stirring time was 6h.

[0067] (2) Suction filter the turbid liquid obtained in step (1) and vacuum-dry the filter cake at 100°C for 1 hour to obtain an initial charge capacity of 400mAh g -1 , Lithiated 2,3,5-trihydroxynitrobenzene with 10% initial charge-discharge efficiency.

[0068] 2. LiCoO 2 (70wt%), lithiated 2,3,5-trihydroxynitrobenzene (10wt%), Super P (10wt%) and PVDF (10wt%) are mixed evenly, by slurrying, coating, drying, rolling Press to obtain the positive pole piece.

[0069] 3. After mixing hard carbon (90wt%), S...

Embodiment 2

[0075] A preparation method of a lithium-ion battery using an organic lithium supplementing agent organic lithium salt to supplement lithium, comprising the following steps:

[0076] 1. Preparation of organolithium salt:

[0077] (1) Weigh lithium acetylene and 2,3,5-trihydroxynitrobenzene at a molar ratio of 1.6:1 and disperse them in an organic solvent and stir at a stirring speed of 250 rpm for 8 hours.

[0078] (2) Suction filter the turbid liquid obtained in step (1) and vacuum-dry the filter cake at 110°C for 1.5h to obtain an initial charge capacity of 436mAh g -1 , Lithiated 2,3,5-trihydroxynitrobenzene with an initial charge-discharge efficiency of 8%.

[0079] 2. LiCoO 2 (73wt%), Li 2 After mixing DHBN (7wt%), Super P (10wt%) and PVDF (10wt%) uniformly, the positive electrode sheet is obtained by pulping, coating, drying and rolling.

[0080] 3. After mixing hard carbon (90wt%), Super P (5wt%) and PVDF (5wt%) evenly, the negative electrode sheet is obtained by pu...

Embodiment 3

[0086] A preparation method of a lithium-ion battery using an organic lithium supplementing agent organic lithium salt to supplement lithium, comprising the following steps:

[0087] 1. Preparation of organolithium salt:

[0088] (1) Weigh lithium acetylene and 2,3,5-trihydroxynitrobenzene at a molar ratio of 1.65:1 and disperse them in an organic solvent and stir at a stirring speed of 300 rpm for 9 hours.

[0089] (2) Suction filter the turbid liquid obtained in step (1) and vacuum-dry the filter cake at 120°C for 2 hours to obtain an initial charge capacity of 456mAh g -1 , Lithiated 2,3,5-trihydroxynitrobenzene with 6% initial charge-discharge efficiency.

[0090] 2. LiCoO 2 (75wt%), lithiated 2,3,5-trihydroxynitrobenzene (5wt%), Super P (10wt%) and PVDF (10wt%) are mixed evenly, by mixing, coating, drying, rolling Press to obtain the positive pole piece.

[0091] 3. After mixing hard carbon (90wt%), Super P (5wt%) and PVDF (5wt%) evenly, the negative electrode sheet i...

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Abstract

The invention belongs to the field of a lithium ion battery material, and particularly discloses a lithium supplement positive electrode active material. The lithium supplement positive electrode active material comprises a positive electrode active material and at least one lithiation organic lithium supplement agent. The invention also discloses a lithium supplement positive electrode material comprising the lithium supplement positive electrode active material, a lithium supplement positive electrode and a lithium ion battery formed by loading of the lithium supplement positive electrode. The lithium supplement additive and the positive electrode active material have cooperativity. Moreover, the invention also proposes a preparation method which is simple to operate and is short in preparation period and high in product activity.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to a lithium-supplementing cathode active material and its preparation and application. Background technique [0002] Lithium ion battery (Lithium Ion Battery, LIB) is currently the most promising and fastest-growing high-efficiency secondary battery, which has many advantages such as high specific energy, low self-discharge, good cycle performance, and no memory effect. Li in lithium-ion batteries + From the positive electrode material, during the first charge of the battery, the negative electrode surface of the lithium-ion battery will consume Li + A layer of SEI film is formed, causing the initial charge and discharge capacity loss (Initial Capacity Loss, ICL). With the continuous development of lithium-ion batteries, high-capacity silicon negative electrode materials are gradually used in lithium-ion batteries, but the ICL of silicon negative electrodes is as...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/60H01M10/0525H01M4/13H01M4/131
CPCH01M4/13H01M4/131H01M4/362H01M4/525H01M4/60H01M10/0525H01M2004/028Y02E60/10
Inventor 张治安赖延清王大鹏胡均贤王鹏程郭琪吴漫东宋佳惠
Owner HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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