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Lithium ion battery

A lithium-ion battery and lithium salt technology, applied in the field of lithium-ion batteries, can solve problems such as poor high-temperature performance and gas swelling

Pending Publication Date: 2022-06-03
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of poor high-temperature performance and serious gas swelling of high-pressure compacted lithium iron phosphate batteries in the prior art, and provide a lithium-ion battery, which has the advantages of high-temperature cycle, good storage performance, etc. advantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] 1) Preparation of electrolyte

[0094] Ethylene carbonate (EC) and ethyl methyl carbonate (EMC) were mixed in a weight ratio of EC:EMC=3:7, and then lithium hexafluorophosphate (LiPF) was added to the resulting mixture. 6 ) to the molar concentration of 1mol / L, then add compound 1 of 0.001% by weight of the total electrolyte weight (note: compound 1 here is the compound 1 in the specification, the same below) and the VC of 2% by weight of the total electrolyte weight;

[0095] 2) Preparation of positive electrode sheet

[0096] The cathode active material LiFePO 4 , Conductive agent conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF) are uniformly mixed in a weight ratio of 93:4:3, and then they are dispersed in N-methyl-2-pyrrolidone (NMP) , to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on both sides of the aluminum foil, dried, calendered (compacted density is shown in Table 1) and vacuum dried, and the...

Embodiment 2-18 and comparative example 1-8

[0104] Follow the method of Example 1, except that the compaction density of the positive and negative electrode materials of the lithium ion battery, the type and addition amount of the compound represented by formula (1) added to the electrolyte, the addition amount of VC, and other additives The type and the amount of added are different, and the specific content is shown in Table 1.

[0105] Table 1

[0106]

[0107] Note: / means no corresponding substance added, LiPO 2 F 2 It is lithium difluorophosphate, DTD is vinyl sulfate, and MMDS is methylene methane disulfonate.

[0108] The relevant properties of the lithium ion batteries prepared in Examples 1-18 and Comparative Examples 1-8 are shown in Table 2.

[0109] Table 2

[0110]

[0111] It can be seen from the results of the above Examples 1-9 and Comparative Example 1 that the positive electrode active material LiFePO of the present invention is used 4 , within the range of the compaction density of the po...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm arranged between the positive electrode and the negative electrode, and a non-aqueous electrolyte, wherein an active material of the positive electrode contains LiFePO4; the non-aqueous electrolyte contains an organic solvent, a lithium salt, vinylene carbonate and a compound represented by a formula (1), in the formula (1), R1 is one or more of chain-shaped, cyclic and aromatic groups with 2-20 carbon atoms, and the compaction density of the positive electrode material is more than 2g / cm < 3 >. According to the lithium ion battery provided by the invention, the circulation and storage performance at high temperature can be remarkably improved, the capacity retention rate and the capacity recovery rate of the battery are greatly improved, the thickness swelling rate after high-temperature storage is obviously reduced, and meanwhile, dissolution of iron ions can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium iron phosphate battery. Background technique [0002] Lithium-ion batteries are widely used in production and life due to their excellent performance. In recent years, with the continuous improvement of the cruising range requirements of new energy vehicles, people have put forward higher requirements for the cycle life and safety of lithium-ion batteries. [0003] Compared with ternary batteries, lithium iron phosphate batteries have more advantages in terms of cycle life, safety and cost, but the energy density of lithium iron phosphate is still far from that of ternary materials. Compaction density and areal density are one of the important means to improve the energy density of lithium iron phosphate batteries, but the lower the porosity of the pole piece, the higher the requirements for the electrolyte: first, when the porosity is low, it is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0566H01M10/0567H01M10/058H01M10/42H01M4/485H01M4/525H01M4/58
CPCH01M10/0525H01M10/058H01M4/485H01M4/525H01M4/5825H01M10/4235H01M10/0566H01M10/0567H01M4/58Y02E60/10C07C2601/14C07C265/14H01M10/0568H01M10/0569H01M2004/021H01M2004/028H01M2300/0037
Inventor 钱韫娴胡时光李红梅员晓刚邓永红
Owner SHENZHEN CAPCHEM TECH
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