Secondary battery

A secondary battery and non-aqueous electrolyte technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of high-temperature cycle and high-temperature storage performance of batteries

Pending Publication Date: 2022-05-10
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of insufficient high-temperature cycle and high-temperature storage performance of the battery due to the dissolution of manganese ions in the existing manganese-based positive electrode material battery, the invention provides a secondary battery

Method used

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Embodiment 1

[0135] This embodiment is used to illustrate the secondary battery disclosed in the present invention and its preparation method, including the following steps:

[0136] 1) Preparation of non-aqueous electrolyte

[0137] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=3:2:5, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, based on 100% of the total mass of the non-aqueous electrolyte, the additives and their contents are shown in Table 1.

[0138] 2) Preparation of positive pole piece

[0139] The positive electrode active material, conductive agent Super-P, and binder polyvinylidene fluoride (PVDF) are mass ratio NCM523: conductive agent conductive carbon black Super-P: binder polyvinylidene fluoride = 97: 1.4: 1.6 After mixing, add N-methylpyrrolidone (NMP), and mix evenly to prepare the positive electrode slurry for lithium-ion batteries; the selection of...

Embodiment 2～31

[0147] Examples 2-31 are used to illustrate the battery disclosed in the present invention and its preparation method, including most of the operation steps in Example 1, the differences are:

[0148] The electrolyte solution shown in Table 1 was used to add the components and the positive electrode material layer.

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Abstract

In order to overcome the problem of insufficient high-temperature circulation and high-temperature storage performance of the battery caused by dissolution of manganese ions in the existing manganese-based positive electrode material battery, the invention provides a secondary battery, the secondary battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, the positive electrode active material comprises a manganese-based material, and the negative electrode comprises a negative electrode material layer containing a negative electrode active material. The non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound represented by a structural formula 1. The secondary battery satisfies the following conditions: 0.05 < = 100 * W * u / (q * s) < = 5, 2.0 g / Ah < = W < = 4.5 g / Ah, 0.05% < = u < = 3.5%, 5% < = q < = 65%, and 10 mg / cm < 2 > < = s < = 30 mg / cm < 2 >. The secondary battery provided by the invention has a relatively high capacity retention ratio in the circulation and high-temperature storage processes, and has relatively good circulation performance and storage performance.

Description

technical field [0001] The invention belongs to the technical field of energy storage battery devices, and in particular relates to a secondary battery. Background technique [0002] Since the commercial application of lithium-ion batteries in the 1990s, lithium-ion batteries have been used in mobile phones and notebooks due to their advantages such as high voltage platform, high energy density, wide temperature range, low self-discharge, no memory effect, and environmental friendliness. Computers and other 3C digital products have been widely used, and in recent years, they have also been rapidly penetrated and developed in the fields of new energy vehicles and large-scale energy storage. [0003] With the continuous maturity of lithium-ion battery technology, end users have put forward higher requirements for the safety performance of lithium-ion batteries. Among them, the element composition of the positive electrode active material in the lithium-ion battery has an impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M4/62
CPCH01M10/0525H01M10/0567H01M4/628Y02E60/10
Inventor 邓永红钱韫娴胡时光林雄贵李红梅
Owner SHENZHEN CAPCHEM TECH CO LTD
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