Active material for nonaqueous secondary battery and nonaqueous secondary battery using same

Abstract

Provided is an active material for non-aqueous secondary battery having improved safety with maintaining the capacity and the cycle characteristic, a process for producing the same, and a non-aqueous secondary battery using the same. The active material can be doped / undoped with an alkali metal ion; the active material is a compound particle comprising three or more of constituting elements, and contains an element A selected from Li, Na, K, Mg, Ca, Sr, Ba, B, Al, Ga, In, Si, Zr, Sn, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ag and Zn as one of the constituting elements; the particle has a region where the concentration of element A is decreasing continuously in the direction of from the particle surface to the particle core; and the ratio (d / D) of the mean width (d) of this region towards the depth direction to the mean radius (D) of the particle is 0.001 H01M 4 / 36 H01M 4 / 04 H01M 10 / 36 H01M 10 / 40 0 12 2 2000 / 10 / 24 1294417 2001 / 5 / 9 100388534 2008 / 5 / 14 2008 / 5 / 14 2008 / 5 / 14 Sumitomo Chemical Co., Ltd. Japan Nakane Kenji Nishida Hiroki Ogawa Yo lu xinhua 72001 The Company Ltd. of the Chinese Patent Agency (Hong Kong) Zi Building 22, Yingjun Centre, No.23, Gangwan Road, Hong Kong Wanzi Japan 1999 / 10 / 26 303957 / 99

Description

technical field [0001] The present invention relates to an active material for a nonaqueous secondary battery, and a nonaqueous secondary battery using the active material. Background technique [0002] With the rapid progress of portable wireless electronic instruments, non-aqueous secondary batteries that can achieve small size, light weight, and large capacity compared with conventional secondary batteries have been developed. Among them, lithium secondary batteries have been put into use as energy sources for portable phones and notebook personal computers. Large-sized high-output batteries have been studied more as energy sources for electric vehicles. Since the electrolyte solution in which auxiliary salts are dissolved in flammable organic solvents and flammable polymer electrolytes are used in non-aqueous secondary batteries, with the development trend of batteries with higher energy density and larger size, the need for safety assurance measures continues Increase...

AI Technical Summary

Problems solved by technology

However, in the case of spinel-type lithium manganese oxide, when high-temperature charge / discharge is repeated, capacity reduction occurs rapidly, that is, there is a problem of poor high-temperature cycle characteristics

To improve this, lithium-rich compositions (Li / Mn > 0.5) or replacement of part of the manganese with other elements (such as chromium) were investigated, but it resulted in a further reduction of the already small capacity in the 4V region, therefore, the safety and the coexistence of the battery performance is difficult