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Lithium ion battery

A lithium-ion battery, carbon atom technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as cycle performance degradation

Pending Publication Date: 2022-08-05
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing lithium nickel manganese oxide battery has the problem of degradation of cycle performance caused by the dissolution of manganese ions and the decomposition of the electrolyte, the invention provides a lithium ion battery

Method used

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Examples

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Embodiment 1

[0157] 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:

[0158] 1) Preparation of positive electrode sheet

[0159] Step 1: In the NMP solvent, add PVDF as a binder and the compound represented by the formula II shown in Table 2, and stir well to obtain a PVDF glue solution added with the compound represented by the formula II.

[0160] Step 2: Add the conductive agent (super P+CNT) to the PVDF glue solution and stir well.

[0161] Step 3: Continue to add the positive electrode active materials shown in Table 2, stir well, and finally obtain the required positive electrode slurry.

[0162] Step 4: uniformly coat the prepared positive electrode slurry on a positive electrode current collector (eg, aluminum foil), and obtain a positive electrode sheet by drying, rolling, die-cutting or slitting.

[0163] 2) Preparation of negative electrode sheet

[01...

Embodiment 2～26

[0176] Examples 2 to 26 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:

[0177] The positive electrode sheet components and electrolyte addition components shown in Table 2 were used.

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Abstract

In order to solve the problem of cycle performance reduction caused by manganese ion dissolution and electrolyte decomposition of the existing lithium nickel manganese oxide battery, the invention provides a lithium ion battery, the lithium ion battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer, and the positive electrode material layer comprises a lithium nickel manganese oxide material as shown in a formula I and a compound as shown in a formula II; the formula I of LiNixMn2-xO4 is shown in the specification, wherein x is more than 0 and less than 2; the non-aqueous electrolyte comprises a non-aqueous organic solvent, electrolyte salt and a first additive, and the first additive comprises boron-containing lithium salt; the lithium ion battery satisfies the following conditions: 0.1 < = (a + b) * m < = 5; 0.005 < = a < = 1, 0.01 < = b < = 3, and 1 < = m < = 3. The lithium ion battery provided by the invention can maintain the stability and oxidation resistance of the high-voltage lithium nickel manganese oxide structure under the condition of relatively high energy density, and obviously inhibits the decomposition reaction of the electrolyte, so that the cycle performance of the battery is improved.

Description

technical field [0001] The present invention relates to the technical field of energy storage electronic components, in particular to a lithium ion battery. Background technique [0002] Lithium-ion batteries (LIBs) occupy a dominant position in the portable electronic device and electric vehicle markets due to their high operating voltage, low self-discharge, long cycle life, no memory effect, environmental friendliness, and good safety performance. demand, it needs to develop in the direction of higher energy density. The energy density largely depends on the product of the specific capacity of the positive electrode and the working voltage. Therefore, the development and application of high-voltage materials is imperative. [0003] High Voltage Spinel Nickel Lithium Manganate LiNi 0.5 Mn 1.5 O 4 (LNMO) cathode has the advantages of high operating voltage, low cost, and environmental friendliness, which is attracting more and more attention. Although the spinel struct...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M10/0567
CPCH01M10/0567H01M10/0525H01M4/505H01M4/525Y02E60/10
Inventor 钱韫娴邓永红李红梅胡时光向晓霞皮琛琦
Owner SHENZHEN CAPCHEM TECH
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