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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, organic electrolyte batteries, etc., can solve the problems of SEI deterioration, damage to the stability of the negative electrode, etc.

Inactive Publication Date: 2002-04-03
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in high-temperature environments due to some unknown reasons such as long-term storage, the SEI will deteriorate and damage the stability of the negative electrode, and it is likely to self-discharge.

Method used

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  • Nonaqueous electrolyte secondary battery
  • Nonaqueous electrolyte secondary battery
  • Nonaqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214]

[0215] Lithium cobalt oxide (LixCoO 2 : but X is 03 positive pole.

[0216]

[0217] As the carbonaceous material A, the mesophase pitch-based carbon fiber (fiber diameter 8 μm, average fiber length 20 μm, length-to-diameter ratio 0.4, and powder X-ray diffraction) obtained by powder X-ray diffraction of the mesophase pitch-based carbon fiber (d 002 )0.3360nm, specific area measured by BET method 1m 2 / g) powder 89% by weight (95 parts by weight), and as the carbonaceous material B, the mesophase pitch-based carbon fiber (fiber diameter 8 μm, average fiber length 20 μm, length-to-diameter ratio 0.4, powder X-ray diffraction The surface spacing (d 002 )0.360nm, specific surface area measured by BET method 2.5m 2 / g) powder 4% by weight (5 parts by weight) is mixed, and then polyvinylidene fluoride (PVdF) 7% by weight and N-methyl-2-pyrrolidone (NMP) are mixed as a binder to prepare Slurry, the slurry is coated on both sides of the current collector made of copp...

Embodiment 2

[0230] Except that the proportion of carbonaceous material A and carbonaceous material B is 92 parts by weight of carbonaceous material A and 8 parts by weight of carbonaceous material B, other non-aqueous electrolyte secondary batteries are manufactured in the same manner as in Example 1 above.

Embodiment 3

[0232] The interplanar spacing (d 002 )0.3363nm, the specific surface area measured by BET method is 0.9m 2 / g) powder gets 89% by weight (95 parts by weight) and the mesophase pitch-based carbon fiber (fiber radius 8 μm, average fiber length 20 μm, powder X-ray diffraction) as carbonaceous material B through 700 ℃ of heat treatment ( 002) surface spacing (d 002 )0.36nm, the specific surface area measured by BET method is 2.5m 2 / g) powder is mixed with 4% by weight (5 parts by weight), and then mixed with 7% by weight of polyvinylidene fluoride (PVdF) and N-methyl-2-pyrrolidone (NMP) as a binder, Make a slurry, apply the slurry on both sides of a current collector composed of copper foil with a thickness of 12 μm, and dry and press to make an electrode with a density of 1.33g / cm 3 the negative pole.

[0233] Except for using this negative electrode, a nonaqueous electrolyte secondary battery was assembled in the same manner as in the above-mentioned embodiment.

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Abstract

Disclosed is a nonaqueous electrolyte secondary battery, comprising a case (1) having a wall thickness (X) not larger than 0.3 mm, a positive electrode (6) provided in the case (1), a negative electrode (9) provided in the case (1) and the negative electrode containing a carbonaceous material capable of absorbing-desorbing lithium ions, and a nonaqueous electrolyte provided in the case (1) and the nonaqueous electrolyte containing a nonaqueous solvent including gamma -butyrolactone and a solute dissolved in the nonaqueous solvent, wherein after being discharged to 3V with a current of 0.2C at room temperature, the voltage reduction caused by the self-discharge at 60 DEG C is not larger than 1.5V in 3 weeks.

Description

technical field [0001] This application is based on the prior Japanese Patent Application No. 2000-270529 filed on September 6, 2000 and the prior Japanese Patent Application No. 2001-054938 filed on February 28, 2001, and claims the priority of the above two earlier applications rights, the entire contents of which are hereby incorporated by reference. Background technique [0002] Currently, thin lithium ion secondary batteries are being commercialized as nonaqueous electrolyte secondary batteries for portable devices such as mobile phones. For this kind of thin lithium ion secondary battery, it is proposed to accommodate the part of the electrode group with the separator interposed between the positive electrode and the negative electrode immersed in the non-aqueous electrolyte solution in an outer package made of laminated sheets. For example, a lithium composite oxide is used as the active material contained in the positive electrode of the secondary battery, and the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M4/133H01M4/58H01M4/587H01M6/16H01M10/0525H01M10/0569H01M10/36H01M10/42H01M10/44H01M50/105
CPCH01M4/133Y02E60/122H01M2/0287H01M10/0525H01M2010/4292H01M2/0207H01M10/0569H01M4/587H01M10/44Y02E60/10H01M50/124Y02P70/50H01M50/105H01M10/04
Inventor 佐藤麻子藤原雅史小岩馨关野正宏志村奈绪长谷部裕之小口雅之小沼雅敬
Owner KK TOSHIBA