Lithium ion battery

A technology of lithium-ion batteries and electrolyte salts, which is applied in the field of secondary batteries, can solve the problems of severe gas production caused by electrolyte side reactions, achieve the effects of improving battery cycle performance, improving rate charge and discharge performance, and avoiding side reactions

Pending Publication Date: 2022-07-01
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of severe electrolyte side reactions and high gas production in existing lithium ion batteries with high compaction and high specific surface area negative electrodes, the invention provides a lithium ion battery

Method used

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Examples

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Embodiment 1

[0080] This embodiment is used to illustrate the lithium ion battery disclosed in the present invention and the preparation method thereof, including the following operation steps:

[0081] 1) preparation of non-aqueous electrolyte: mixing ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) by mass ratio as EC:EMC:DMC=2:1:7, Then add lithium hexafluorophosphate (LiPF 6 ) to a mass concentration of 12.5%, and then add the additives corresponding to the content in the table below. The amount of the additive is calculated as a percentage of the total mass of the electrolyte.

[0082] VC(%) FEC(%) Compound 1 (%) LiFSI (%) 1 10 0.25 2.5

[0083] 2) Preparation of positive plate

[0084] The cathode active material NCM811, conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF) were mixed in a mass ratio of 93:4:3, and then dispersed in N-methyl-2-pyrrolidone (NMP) , the positive electrode slurry was obta...

Embodiment 2～9

[0092] Examples 2 to 9 are used to illustrate the lithium ion battery disclosed in the present invention and the preparation method thereof, including most of the operation steps in Example 1, and the differences are:

[0093] In the preparation steps of the non-aqueous electrolyte:

[0094] Based on the total mass of the non-aqueous electrolyte solution as 100%, the non-aqueous electrolyte solution was added with the components in the mass percentages shown in Examples 2 to 9 in Table 1.

[0095] In the preparation steps of the negative plate:

[0096] The coating weight, the compaction density and the specific surface area of ​​the negative electrode active material shown in Examples 2 to 9 in Table 1 were used for preparation.

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Abstract

In order to solve the problems that an existing lithium ion battery with a high-compaction and high-specific-surface-area negative electrode is serious in electrolyte side reaction and high in gas production rate, the invention provides a lithium ion battery which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the negative electrode comprises a negative electrode material layer, the compaction density of the negative electrode material layer is larger than or equal to 1.4 g/cm < 3 >, and the non-aqueous electrolyte is a non-aqueous electrolyte. The negative electrode material layer comprises a negative electrode active material, the non-aqueous electrolyte comprises a solvent, electrolyte salt, vinylene carbonate, fluoroethylene carbonate and unsaturated phosphate as shown in a structural formula 1, and the electrolyte salt comprises LiPF6 and LiFSI. The lithium ion battery provided by the invention has relatively good cycle performance, high and low temperature storage performance and lithium precipitation resistance.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a lithium ion battery. Background technique [0002] With the vigorous development of the lithium battery market for power and power tools, cylindrical lithium batteries rely on their mature production technology, good consistency and high energy density to occupy a broad market. First-tier lithium battery manufacturers such as LG, Panasonic, Tian Peng and others have a full layout in the field of cylindrical batteries. However, the cylindrical battery also has certain defects in its structural settings. For example, due to the lack of an exhaust device, it is easy to cause gas production to accumulate during the process of first charging, high temperature storage, and cycling, and the high internal pressure leads to the cap CID (Current Interrupt Device , safety explosion-proof valve) is disconnected, and the battery is disconnected and cannot be used. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0567H01M10/0568H01M10/0566H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0566H01M10/4235H01M10/42
Inventor 钱韫娴胡时光刘方正邓永红
Owner SHENZHEN CAPCHEM TECH CO LTD
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