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Rechargeable lithium battery

A lithium battery and recharging technology, applied in lithium batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of reduced capacity and low average potential during discharge

Pending Publication Date: 2020-11-03
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, LFP is used as a low-heat-generating safe material, but its average potential is relatively low, which is accompanied by a decrease in capacity during discharge

Method used

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  • Rechargeable lithium battery
  • Rechargeable lithium battery
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0109] The positive active material of 95wt%, the polyvinylidene fluoride binding agent of 3wt% and the Ketjen black conductive material of 2wt% are mixed in N-methylpyrrolidone solvent to prepare positive active material slurry, and positive active material is passed through LiCoO 2 / LiFePO 4 It was prepared as the first positive electrode active material / second positive electrode active material mixed at a weight ratio of 9:1. The positive active material slurry was coated on both surfaces of the aluminum current collector, followed by drying and pressing to manufacture a positive electrode having a positive active material layer.

[0110] 98 wt% of graphite, 0.8 wt% of carboxymethyl cellulose, and 1.2 wt% of styrene-butadiene rubber were mixed in pure water to prepare negative electrode active material slurry. The negative active material slurry was coated on both surfaces of the copper current collector, followed by drying and pressing to manufacture a negative electrode...

example 2

[0130] Evaluation Example 2: Evaluation of Crash Safety

[0131] The rechargeable battery cells of Example 1 and Comparative Example 1 were charged at 0.5C with a cut-off value of 0.05C up to the maximum voltage and aged for 24 hours, and then evaluated as follows.

[0132] ·Place the fully charged unit on a steel plate (thickness ≥ 5cm).

[0133] • Place a round rod (Φ15mm) in the center of the sample, where the round rod should be placed in a vertical direction with respect to the electrodes.

[0134] Cylindrical monoliths are evaluated by placing a round bar in the center like a seesaw shape.

[0135] • A cylinder weighing 9 kg was dropped from a height of 610 mm onto a round bar, the results checked and provided in Table 2.

[0136] The evaluation criteria are as follows.

[0137]

[0138] L1: no effect on appearance

[0139] L2: Visually scratched but no leaks

[0140] L3: Leakage

[0141] L4: Fire

[0142] L5: Explosion

[0143] [Table 2]

[0144] ...

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Abstract

Disclosed is a rechargeable lithium battery including an electrode assembly, the electrode assembly including: a positive electrode including a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector; the negative electrode comprises a negative electrode current collector, a negative electrode active substance layer arranged on the negative electrode current collector and a negative electrode functional layer arranged on the negative electrode active substance layer; and a separator in which the positive electrodeactive material layer includes a first positive electrode active material including at least one compound oxide of lithium and a metal selected from cobalt, manganese, nickel, and combinations thereof, and a second positive electrode active material including a compound represented by Chemical Formula 1, and the negative electrode functional layer includes sheet-like polyethylene particles, and abattery capacity of greater than or equal to about 3.5 Ah, [Chemical Formula 1] LiFe<1-x1>M<x1>PO4, in Chemical Formula 1, 0.90 < = a < = 1.8, 0 < = x1 < = 0.7, M is Mn, Co, Ni, or a combination thereof.

Description

[0001] This application claims priority and benefit from Korean Patent Application No. 10-2019-0052574 filed with the Korean Intellectual Property Office on May 3, 2019, the entire contents of which are hereby incorporated by reference. technical field [0002] The present disclosure relates to a rechargeable lithium battery. Background technique [0003] Portable information devices such as cell phones, laptop computers, smart phones, etc. or electric vehicles have used rechargeable lithium batteries having high energy density and easy portability as driving power sources. In addition, research on using a rechargeable lithium battery as a power source or power storage of a hybrid vehicle or an electric vehicle by using high energy density characteristics has been actively conducted recently. [0004] One of the main research tasks of such rechargeable lithium batteries is to improve the safety of rechargeable lithium batteries. For example, if a rechargeable lithium batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0525H01M4/505H01M4/525H01M4/58H01M4/13H01M10/42H01M50/417
CPCH01M10/052H01M10/0525H01M4/505H01M4/525H01M4/5825H01M4/13H01M10/4235H01M2004/027H01M50/417H01M4/622H01M4/366H01M4/364H01M50/107H01M50/46Y02E60/10H01M4/136H01M4/131H01M4/133H01M4/62H01M2004/021
Inventor 李东明金基俊刘喜恩尹延曦李圭曙河在焕
Owner SAMSUNG SDI CO LTD
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