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Lithium ion battery positive pole active materials and battery

A positive active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as battery over-discharge, battery pack failure, reverse battery charging, etc., to reduce damage and delay rapid decline. , Excellent effect of anti-overdischarge performance

Inactive Publication Date: 2008-07-30
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the protection circuit module (PCM) is not used, or several batteries connected in series (such as 3 9V) share a protection circuit module (PCM), there will be problems in which one or several batteries enter the circuit before other batteries due to consistency differences. In the stage of sharp drop in discharge voltage, the battery may be over-discharged or even reversed. Other batteries will charge the reversed battery, which will eventually cause the battery pack to fail.

Method used

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  • Lithium ion battery positive pole active materials and battery
  • Lithium ion battery positive pole active materials and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The positive electrode active material of the lithium ion battery includes a first active material A and a second active material B,

[0026] The first active material A is Li 2 Nb 2 o 5 ,

[0027] The second active material B is LiFePO 4 ,

[0028] The mass mixing ratio A / (A+B) of the first active material A and the second active material B is 2 / (2+8).

[0029]Carbon black is used as a conductive agent, and polyvinylidene fluoride (PVDF) is used as a binder.

[0030] The positive electrode active material, carbon black, and polyvinylidene fluoride (PVDF) were mixed in a weight ratio of 85:10:5, and dispersed in N-methylpyrrolidone (NMP) to prepare a slurry. Spread the slurry evenly on the aluminum foil, dry, roll, and cut into the desired shape.

[0031] Graphite is used as negative electrode active material, acetylene black is used as conductive agent, polyvinylidene fluoride (PVDF) is used as binder, and slurry is prepared in N-methylpyrrolidone (NMP) accordin...

Embodiment 2

[0035] Take the consistent matching batteries made in Example 1, and connect three in series to form a battery pack. Carry out a 1C charge-discharge cycle on the battery pack, the charge-discharge cut-off voltage is 11.4-6V, and monitor the voltage of three monomers at the same time, the results are shown in Figure 2. In 100 cycles, the voltage of the three batteries at the end of each cycle discharge is above 1.5V, and there is no phenomenon of over-discharge and reverse polarity. After 100 cycles, the capacity retention of the battery pack was 90%.

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Abstract

The invention relates to a positive electrode active substance of lithium ion battery and battery thereof, which belongs to the field of battery. The positive electrode active material of lithium ion battery comprises a first active substance A and a second active substance B, wherein the first active substance A is lithium niobate with following structural formula: LixNbyOz,; and the second active substance B is other active substances capable of doping / undoping lithium except lithium titanate. The mass mixture ratio A / (A+B) of the first active substance A and the second active substance B is between 0.05 and 0.5. The LixNbyOz has stable lithium doping / undoping performance, good cycle performance, low lithium doping / undoping potential about 1.7V (for Li<+> / Li) and wide charge / discharge platform. The invention can effectively postpone the acute decrease speed of the battery voltage and obviate or reduce the damage to the battery or the battery pack caused by overdischarge or reverse polarity. The positive electrode active substance has excellent overdischarge-resistant performance and is suitable for fabricating lithium ion secondary battery in serial battery pack.

Description

technical field [0001] The invention relates to a positive electrode active material of a lithium ion battery and a battery thereof, belonging to the field of batteries, in particular to a lithium ion positive electrode active material having an anti-overdischarge function and suitable for making a series battery pack and a battery thereof. Background technique [0002] Portable electronic devices such as mobile phones, laptops, mp3 players or portable video players have become more popular than ever in recent years. Its market demand is increasing. There is also an increasing demand for batteries used in these products to have higher energy density and be lighter in weight. Recently, Li-ion rechargeable batteries are widely used in most portable electronic products due to their high energy density, durability with long cycle life and lighter weight. Lithium-ion batteries may be exposed to many abnormal conditions, so it must meet electrical and environmental safety condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M10/40
CPCY02E60/10
Inventor 陈京才薛建军童叶翔夏信德崔燕
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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