成果報告書詳細
管理番号20100000000114
タイトル*平成20年度中間年報 系統連系円滑化蓄電システム技術開発/次世代技術開発/高電位負極を用いる次世代リチウムイオン電池の研究開発
公開日2010/2/5
報告書年度2008 - 2008
委託先名学校法人同志社
プロジェクト番号P06004
部署名燃料電池・水素技術開発部 蓄電技術開発室
和文要約1. 研究開発の内容及び成果等 (1) 目的・概要 風力発電や太陽光発電のような新エネルギーは、エネルギー自給率の向上や地球温暖化防止に資するほか、分散型エネルギーシステムとしてのメリットも期待できる貴重なエネルギー源であり、国の長期需給見通しでは、2030 年までに電力供給量の10%相当の導入を目指している。一方で、これら新エネルギーは、自然の影響を受けやすく出力が不安定な電源であり、電力系統にこのように大量に連系した場合、周波数の維持だけでなく、火力発電などの集中型電源の運用にも大きな支障をきたし、電力系統の運用が困難になることが予想される。このような影響を避けるために、新エネルギーが大量に導入される際には、蓄電技術による出力の平滑化や、夜間のような軽負荷時の新エネルギー発電電力の蓄電などが必要になる。本プロジェクトにおいては、蓄電部本体及び蓄電システム等の技術開発を行うことにより、風力、太陽光等新エネルギーの出力変動に伴う電力系統への悪影響を回避することを可能とし、新エネルギー導入目標の達成を加速することを目的とする。
英文要約Title: Development of an Electric Energy Storage System for Grid-connection with New Energy Resources. Technological Development Related to New, Next-generation Electric Energy Storage. Development of Next Generation Lithium Ion Batteries Using High Potential Negative Electrode (FY2008-FY2009) FY2008 Annual Report The goal of this project is to develop novel lithium ion battery systems of high performance, low cost, long durability, and high safety for use in next-generation electric energy storage by using TiO2(B) as a high potential negative electrode. In FY2006 and FY2007, a feasibility study was conducted on a low-cost method for TiO2(B) powder preparation and evaluation of its fundamental charge-discharge characteristics such as cycleability, rate-capability, etc. For FY 2008 and FY2009, further reduction in cost and improvement of energy density of the TiO2(B) negative electrode material have been studied to establish a next-generation lithium-ion battery system with splendid performance, low cost, long durability, and high safety. The R&D contents and results of this project in FY2008 are summarized as follows. "1. Reduction of cost and improvement of the energy density of TiO2(B) negative electrode": Raising the lower cut-off potential from 1.0 to 1.4 V vs. Li+/Li greatly reduced the irreversible capacity (< 50 mAh g-1), with a trade-off of a reduction in the discharge capacity from 200 to 170 mAh g-1. Galvanostatic intermittent titration measurements revealed that large polarization appears in the initial and final stages of charging. The large polarization is brought about probably by the low electronic conductivity of the end materials, Ti(IV)O2 and LiTi(III)O2. A lower rate (C/60 at 30oC) and a higher temperature (60oC at C/6) gave discharge capacities higher than 250 mAh g-1 even with a cut-off potential of 1.4 V. TiO2(B) powder was obtained from a Cs2Ti5O11 precursor instead of K2Ti4O9, and its charge-discharge characteristics were investigated. It gave an initial discharge capacity of 273 mAh g-1 with a good cycleability. "2. Construction of small-size full cells using the TiO2(B) negative electrode and evaluation of their charge-discharge characteristics": A lithium transition-metal oxide, LiNi1/3Co1/3Mn1/3O2, was chosen as a positive electrode material, and its charge-discharge characteristics were investigated. It gave a high capacity of > 150 mAh g-1 with good cycleability. A coin-type full cell was constructed using the LiNi1/3Co1/3Mn1/3O2 positive electrode and the TiO2(B) negative electrode, and its charge-discharge characteristics were evaluated. It was shown that the TiO2(B) works well as a high potential negative electrode in the coin-type full cell.
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