- 期刊
新世代高電壓正極材料：鋰鎳錳氧之開發研究
New Generation High Voltage Cathode Materials: Development and Research of LNMO
摘要
尖晶石鋰鎳錳氧（LiNi_(0.5)Mn_(1.5)O_4, LNMO）正極材料具有提高鋰電池能量密度及不含鈷的化學特性，近年來逐漸受到電池產業重視。另一方面，由於該材料之工作電壓較高（~4.7V），可搭配本公司已投入開發的鈦酸鋰（Li_4Ti_5O_(12), LTO）負極材料，未來技術可應用在大型動力電池系統之開發。在本研究裡，鎳源及錳源首先利用共沈澱法製備LNMO正極材料之前驅物，沉澱經洗滌、乾燥、過篩後，再與計量比的鋰源混合均勻，於空氣氣氛下，以適當溫度進行燒結，可獲得LNMO 正極材料。根據研究結果顯示，本研究開發之LNMO材料在0.2C的充放條件下可獲得超過130mAhg^(-1)之電容量，在6C倍率放電測試時保有約89%之電量維持率。再者，輔以釩金屬摻雜方式可進一步提升其倍率放電特性，當10C 放電測試時仍維持85%左右之電量維持率。
並列摘要
Spinel lithium nickel manganese oxide LNMO cathode material has the characteristics of increasing the energy density of lithium batteries and cobalt-free chemistry, and has gradually attracted the attention of the battery industry in recent years. On the other hand, this material has a higher working voltage (~4.7V), it can be used with the LTO anode material that CPC has invested in production. This technology can be applied to the development of large-scale power battery systems in the future. In this study, the precursor of LNMO were prepared by co-precipitation method from nickel source and manganese source. The precipitate was washed, dried, and sieved, and then mixed evenly with stoichiometric ratio of lithium source. The LNMO cathode powders were sintered at the appropriate temperature in atmosphere. According to the research results, the LNMO material in this research has a capacity which is more than 130mAhg^(-1) under 0.2C charge and discharge conditions, and retains a capacity retention of 89% at the 6C discharge test. Furthermore, the vanadium metal doping modification can further promote its rate discharge characteristics, and its capacity retention is still about 85% at the 10C discharge test.