Negative electrode for nonaqueous electrolyte secondary batteries and lithium ion secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in battery electrodes, secondary batteries, batteries, etc., to achieve the effects of low volume expansion, high battery capacity, and high ring charge/discharge efficiency

Active Publication Date: 2011-04-20
SHIN ETSU CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of obtaining mixed solids by simultaneous generation of silicon and silicon oxide gases has the working disadvantage that the low vapor pressure of silicon requires a process at high temperatures in excess of 2,000 °C

Method used

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  • Negative electrode for nonaqueous electrolyte secondary batteries and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Preparation of conductive particles

[0072] The average particle size of 100g is 5μm, and the BET specific surface area is 3.5m 2 / g silicon oxide SiO x (x = 1.01) The pellets were loaded into a batch furnace. The furnace was evacuated by means of an oil-sealed rotary vacuum pump while heating the furnace to 1,100°C. Once this temperature is reached, the CH 4 Gas was passed into the furnace at 0.3 NL / min, where the carbon coating process was carried out for 5 hours. A reduced pressure of 800 Pa was maintained during the treatment. At the end of the treatment, the furnace was cooled and 97.5 g of black particles were recovered, i.e. with SiO dispersed in 2 Carbon-coated particles in Si. The black particles have an average particle size of 5.2 μm and a BET specific surface area of ​​6.5 m 2 / g, these particles are electrically conductive due to the 5.1 wt% carbon-coated coating based on the black particles.

[0073] Preparation of polyamide-imide resin soluti...

Embodiment 2

[0085] Preparation of polyamide-imide resin solution with amide / imide ratio of 75 / 25

[0086] Prepare the polyamide / imide resin solution as in Example 1, except that 96.0 g (0.5 moles) of trimellitic anhydride is used as the polyfunctional carboxylic acid anhydride, and 83.0 g (0.5 moles) of isophthalic acid is used as the polyfunctional anhydride. Carboxylic acid, 250.0 g (1.0 mol) of 4,4'-diphenylmethane diisocyanate as polyfunctional isocyanate, and 708 g of NMP. The battery test was performed as in Example 1, except that the polyamide / imide resin solution prepared here was used. The results are also reported in Table 1.

Embodiment 3

[0088] Preparation of polyamide-imide resin solution with amide / imide ratio of 87.5 / 12.5

[0089] The polyamide / imide resin solution was prepared as in Example 1, except that 48.0 g (0.25 moles) of trimellitic anhydride was used as the polyfunctional carboxylic anhydride, and 124.5 g (0.75 moles) of isophthalic acid was used as the polyfunctional anhydride. Carboxylic acid, 250.0 g (1.0 mol) of 4,4'-diphenylmethane diisocyanate as polyfunctional isocyanate, and 708 g of NMP. The battery test was performed as in Example 1, except that the polyamide / imide resin solution prepared here was used. The results are also reported in Table 1.

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Abstract

A negative electrode comprising (A) particles having Si dispersed in SiO, and (B) a polyamide-imide resin which contains amide and imide groups in an amide / imide ratio of 25 / 75 to 99 / 1 and has a weight average molecular weight of 10,000-200,000 is suited for nonaqueous electrolyte secondary batteries. The electrode exhibits a high 1st cycle charge / discharge efficiency and improved cycle performance while maintaining a high battery capacity and a low volume expansion.

Description

field of invention [0001] The present invention relates to a negative electrode used in a non-aqueous electrolyte secondary battery, and a lithium ion secondary battery containing the electrode. Background technique [0002] With the recent rapid development of portable electronic equipment and communication devices, nonaqueous electrolyte secondary batteries having high energy density are highly demanded from the viewpoints of cost, size, and weight reduction. Known methods in the prior art for increasing the capacity of such nonaqueous electrolyte secondary batteries include, for example, the use of oxides of B, Ti, V, Mn, Co, Fe, Ni, Cr, Nb, and Mo and composite oxidations thereof. as negative electrode materials (JP 3008228 and JP 3242751); using M 100-x Si x As a negative electrode material, wherein x≥50at%, and M is Ni, Fe, Co or Mn obtained by quenching the melt (JP 3846661); using silicon oxide as a negative electrode material (JP 2997741); and using Si 2 N 2 O, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M10/0525
CPCY02E60/122H01M4/134H01M10/0525H01M4/625H01M4/621H01M4/483H01M4/364H01M4/131H01M4/624H01M4/622Y02E60/10H01M4/366H01M4/38H01M4/386H01M4/48H01M4/485H01M4/505H01M4/60H01M4/606H01M4/663H01M2220/30
Inventor 宫脇悟山田佳益大庭敏夫池田正雄须之内和宏
Owner SHIN ETSU CHEM CO LTD
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