Core Viewpoint - The incident involving the Li Auto MEGA has reignited concerns about battery safety in the electric vehicle industry, particularly regarding the use of ternary lithium batteries versus lithium iron phosphate batteries [4][7][9]. Group 1: Incident Overview - The Li Auto MEGA, priced over 500,000 yuan and marketed for family safety, caught fire within 10 seconds without a severe collision, raising alarms in the new energy sector [4][5]. - Following the incident, Li Auto acknowledged a defect in the coolant of the MEGA 2024 model, which could lead to thermal runaway in extreme conditions [7][9]. Group 2: Battery Safety Debate - The MEGA incident has shifted focus from vehicle design issues to battery safety, with ternary lithium batteries, known for their high performance, now under scrutiny for their thermal stability [9][12]. - Research indicates that ternary lithium batteries can begin to decompose at around 200°C, leading to rapid thermal runaway, while lithium iron phosphate batteries require much higher temperatures (500-800°C) to decompose, making them inherently safer [12][13]. Group 3: Market Dynamics and Battery Choices - The shift in market dynamics since 2016 has favored ternary lithium batteries due to their higher energy density, which has made them the preferred choice for high-end electric vehicles [19][21]. - However, the rising costs of ternary lithium batteries and the increasing market share of lithium iron phosphate batteries, which have surpassed 70% in recent months, indicate a significant change in consumer preferences [21][28]. Group 4: Future of Battery Technologies - The future of battery technology may see a coexistence of both battery types, as high-end vehicles continue to demand the performance benefits of ternary lithium batteries, while cost-effective models may increasingly adopt lithium iron phosphate batteries [34][41]. - Innovations in battery technology, such as solid-state batteries, are expected to leverage the advantages of ternary lithium materials while addressing safety concerns, indicating a potential evolution in the industry [39][41].