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Novel lithium ion battery with high power and high energy density

A high-energy density, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large sacrifice of energy density and insufficient high-power output capacity of batteries, and achieve excellent rate discharge capacity, high Energy density, the effect of increasing gram capacity

Inactive Publication Date: 2017-10-13
鹤壁市诺信电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional positive and negative electrode material systems are difficult to meet the requirements of high energy density and high power density at the same time. At present, there are many solutions to achieve high power requirements alone or high energy density alone, but to achieve high power and high energy density at the same time great challenge
[0004] It is commonly used to increase energy density by using high-capacity materials or high-density and high-pressure compaction process plates, etc., but the high-power output capacity of the battery designed in this way is insufficient; the way to increase power density is to use plates with higher porosity, thinner plates, etc. Polar plates and other methods can achieve good output power, but the sacrifice of energy density is also relatively large
There is a conflict in the direction of performance improvement in the two aspects, which is also the difficulty in achieving high power and high energy at the same time

Method used

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  • Novel lithium ion battery with high power and high energy density
  • Novel lithium ion battery with high power and high energy density
  • Novel lithium ion battery with high power and high energy density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Taking the manufacturing process of a new type of high-power and high-energy-density lithium-ion battery with a capacity of 3000mAh as an example, the specific implementation process is as follows:

[0026] Preparation of positive electrode slurry:

[0027] Using N-dimethylpyrrolidone (NMP) as the solvent, the positive active material is high-nickel modified ternary material (NCA) (Tianjin Bamo Technology Co., Ltd. BMT920), and the conductive agent is superconducting carbon black (Super-P) and graphene, the binder is polyvinylidene fluoride (PVDF), and the weight ratio of NMP added is between 40% and 70% of solid matter. The weight percent of each substance in this embodiment is: NCA 95.5%, Super-P 1%, graphene 1%, PVDF 2.5%, NMP 65%.

[0028] (1) First prepare the positive electrode mixture: pre-disperse NCA and Super-P in the mixer for 1~2 hours, so that the conductive agent is evenly dispersed on the surface of NCA to obtain the positive electrode mixture.

[0029]...

Embodiment 2

[0040] The preparation of the positive electrode slurry and the electrolyte in this example are different from those in Example 1, and the rest of the production methods are the same as in Example 1. The preparation of the positive electrode slurry of the present embodiment: with NMP as solvent, active material is high-nickel ternary material (NMC811), conductive agent is Super-P and carbon nanotube (CNTs), binding agent is PVDF, NMP adds weight The ratio is between 50 and 72%. The weight percent of each substance in this example is: NMC 95.5%, Super-P 1%, CNTs 1%, PVDF 2.5%, NMP 65%. Add PVDF to NMP first, stir for 2~4h to prepare PVDF glue. Then add CNTs to the above PVDF glue and stir for 2~4 hours; then add Super-P to the above mixture and stir for 2~4 hours; finally add NMC to the above mixture, stir for 4~6 hours, then vacuumize and degas coating.

[0041] Electrolyte preparation: Lithium salt is lithium hexafluorophosphate (LiPF 6 ), the organic solvent is a ternary...

Embodiment 3

[0043] The preparation of the negative electrode slurry and the electrolyte in this example are different from those in Example 1, and the rest of the production methods are the same as in Example 1. The preparation of the negative electrode slurry of the present embodiment: with deionized water (H 2 O) is the solvent, the active material is SiO, soft carbon and artificial graphite, the conductive agent is superconducting carbon black (Super-P) and single-walled carbon nanotubes, and the binder is acrylate and sodium carboxymethyl cellulose (CMC ) composition, the addition ratio of deionized water is between 100% and 200%. The weight percent of each substance in this example is: SiO5.7%, soft carbon 19.25%, artificial graphite 68.7%, Super-P 2.30%, single-walled carbon nanotubes 0.05%, acrylate 2.5%, CMC 1.5%, H 2 O is 150% of solid matter. First prepare the negative electrode mixture, pre-disperse SiO soft carbon, artificial graphite, and Super-P in a mixer for 1~2 hours, s...

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Abstract

The invention provides a novel lithium ion battery with high power and high energy density. The novel lithium ion battery comprises a positive plate, a negative plate, a diaphragm, electrolyte, a lug and a shell; the negative plate is mixed by negative electrode active materials, a negative electrode conductive agent and a negative electrode binder; the negative electrode active materials are composed of SiO, soft carbon and / or artificial graphite; the negative electrode conductive agent is at least one of superconductive carbon black and a single-walled carbon nanotube; and the negative electrode binder is at least two combinations of styrene butadiene rubber, acrylate and sodium carboxymethyl cellulose. The battery provided by the invention has excellent rate discharge capacity and high energy density; and besides, the weight specific energy density reaches 230wh / kg, the volume specific energy density is above 650wh / L, the power density is above 1,500w / kg, the rate discharge performance reaches 10C, and the cycle performance can reach more than 500 times.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery with high power, high energy density and stable performance and a manufacturing method thereof. Background technique [0002] At present, lithium-ion batteries have the advantages of high working voltage, high specific energy, light weight, long life, and low self-discharge, and are widely used in various electronic products, drones, electric vehicles, etc. Conventional electrical equipment has low operating current and long standby time, and conventional lithium-ion batteries can meet its requirements. For electrical equipment such as drones and electric vehicles, lithium-ion batteries need to continuously provide large currents during work to meet their high power output requirements. At the same time, they also need high energy density to prolong the use time and increase the mileage. With the development of technology and the improvement o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0567
CPCH01M4/364H01M4/48H01M4/587H01M4/625H01M10/0525H01M10/0567Y02E60/10
Inventor 郭峰高巧娟
Owner 鹤壁市诺信电子有限公司
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