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Lithium ion battery negative pole active materials and battery

A negative active material, lithium-ion battery technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of battery pack failure, reverse battery charging, battery over-discharge, etc., to delay the speed, avoid or reduce damage , Excellent 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 negative pole active materials and battery
  • Lithium ion battery negative pole active materials and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] LiFePO 4 As the positive electrode active material, carbon black is used as a conductive agent, polyvinylidene fluoride (PVDF) is used as a binder, and the weight ratio is 85:10:5, and the above mixture is 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.

[0028] Graphite and Li 4 / 3 Ti 5 / 3 o 4 (7:3, w / w) as the active material, acetylene black as the conductive agent, polyvinylidene fluoride (PVDF) as the binder, prepared in N-methylpyrrolidone (NMP) according to the weight ratio of 80:15:5 slurry. Coat the slurry evenly on the copper foil, dry, roll, and cut into the desired shape. Graphite / (graphite and Li 4 / 3 Ti 5 / 3 o 4 ) The mass mixing ratio is between 0.05-0.5.

[0029] The electrolyte is 1M LiPF 6 - EC / DMC (70:30, v / v). A porous polypropylene membrane was used as a separator to fabricate AA cylindrical lithium-ion secondary batteries by conventional met...

Embodiment 2

[0032] 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 95%.

Embodiment 3

[0034] 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 11.4-5V, and monitor the voltage of three monomers at the same time, the results are shown in Figure 3. 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 85%.

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Abstract

The invention relates to a negative electrode active substance of lithium ion battery and battery thereof, which belongs to the field of battery. The negative 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 titanate with following structural formula: Li(1+x)Ti(2-x)O4, and x is not less than 0 and not larger than 1 / 3; 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 Li(1+x)Ti(2-x)O4 (x not less than 0 and not larger than 1 / 3) can be added into the negative electrode of an lithium ion secondary battery as an overdischarge-resistant active substance to effectively control the acute decrease speed of the battery voltage by a second discharge platform occurred at the final discharge stage, thus obviating or reducing the damage to the battery or the battery pack caused by overdischarge or reverse polarity. The negative electrode active substance is suitable for fabricating lithium ion secondary battery in serial battery pack.

Description

technical field [0001] The invention relates to a negative electrode active material of a lithium ion battery and a battery thereof, belonging to the field of batteries, in particular to a lithium ion negative electrode active material and a battery thereof which have an anti-overdischarge function and are suitable for making series-connected battery packs. 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. [0003] Lithium-ion batteries may be exposed to many abnormal conditions, so it must meet electrical and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/38H01M10/40
CPCY02E60/122Y02E60/10
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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